# all files / dist/ fabric.js

55.5% Statements 3892/7012
49.1% Branches 2272/4627
64.77% Functions 820/1266
55.52% Lines 3891/7008

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     /* build: `node build.js modules=ALL exclude=json,gestures minifier=uglifyjs` */
    /*! Fabric.js Copyright 2008-2015, Printio (Juriy Zaytsev, Maxim Chernyak) */

    var fabric = fabric || { version: "1.6.2" };
    Eif (typeof exports !== 'undefined') {
      exports.fabric = fabric;
    }

    Iif (typeof document !== 'undefined' && typeof window !== 'undefined') {
      fabric.document = document;
      fabric.window = window;
      // ensure globality even if entire library were function wrapped (as in Meteor.js packaging system)
      window.fabric = fabric;
    }
    else {
      // assume we're running under node.js when document/window are not present
      fabric.document = require("jsdom")
        .jsdom("<!DOCTYPE html><html><head></head><body></body></html>");

      Iif (fabric.document.createWindow) {
        fabric.window = fabric.document.createWindow();
      } else {
        fabric.window = fabric.document.parentWindow;
      }
    }

    /**
     * True when in environment that supports touch events
     * @type boolean
     */
    fabric.isTouchSupported = "ontouchstart" in fabric.document.documentElement;

    /**
     * True when in environment that's probably Node.js
     * @type boolean
     */
    fabric.isLikelyNode = typeof Buffer !== 'undefined' &&
                          typeof window === 'undefined';

    /* _FROM_SVG_START_ */
    /**
     * Attributes parsed from all SVG elements
     * @type array
     */
    fabric.SHARED_ATTRIBUTES = [
      "display",
      "transform",
      "fill", "fill-opacity", "fill-rule",
      "opacity",
      "stroke", "stroke-dasharray", "stroke-linecap",
      "stroke-linejoin", "stroke-miterlimit",
      "stroke-opacity", "stroke-width",
      "id"
    ];
    /* _FROM_SVG_END_ */

    /**
     * Pixel per Inch as a default value set to 96. Can be changed for more realistic conversion.
     */
    fabric.DPI = 96;
    fabric.reNum = '(?:[-+]?(?:\\d+|\\d*\\.\\d+)(?:e[-+]?\\d+)?)';
    fabric.fontPaths = { };

    /**
     * Device Pixel Ratio
     * @see https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/HTML-canvas-guide/SettingUptheCanvas/SettingUptheCanvas.html
     */
    fabric.devicePixelRatio = fabric.window.devicePixelRatio ||
                              fabric.window.webkitDevicePixelRatio ||
                              fabric.window.mozDevicePixelRatio ||
                              1;

    (function() {

      /**
       * @private
       * @param {String} eventName
       * @param {Function} handler
       */
      function _removeEventListener(eventName, handler) {
        Iif (!this.__eventListeners[eventName]) {
          return;
        }
        var eventListener = this.__eventListeners[eventName];
        if (handler) {
          eventListener[eventListener.indexOf(handler)] = false;
        }
        else {
          fabric.util.array.fill(eventListener, false);
        }
      }

      /**
       * Observes specified event
       * @deprecated `observe` deprecated since 0.8.34 (use `on` instead)
       * @memberOf fabric.Observable
       * @alias on
       * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})
       * @param {Function} handler Function that receives a notification when an event of the specified type occurs
       * @return {Self} thisArg
       * @chainable
       */
      function observe(eventName, handler) {
        if (!this.__eventListeners) {
          this.__eventListeners = { };
        }
        // one object with key/value pairs was passed
        if (arguments.length === 1) {
          for (var prop in eventName) {
            this.on(prop, eventName[prop]);
          }
        }
        else {
          if (!this.__eventListeners[eventName]) {
            this.__eventListeners[eventName] = [ ];
          }
          this.__eventListeners[eventName].push(handler);
        }
        return this;
      }

      /**
       * Stops event observing for a particular event handler. Calling this method
       * without arguments removes all handlers for all events
       * @deprecated `stopObserving` deprecated since 0.8.34 (use `off` instead)
       * @memberOf fabric.Observable
       * @alias off
       * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})
       * @param {Function} handler Function to be deleted from EventListeners
       * @return {Self} thisArg
       * @chainable
       */
      function stopObserving(eventName, handler) {
        Iif (!this.__eventListeners) {
          return;
        }

        // remove all key/value pairs (event name -> event handler)
        if (arguments.length === 0) {
          for (eventName in this.__eventListeners) {
            _removeEventListener.call(this, eventName);
          }
        }
        // one object with key/value pairs was passed
        else if (arguments.length === 1 && typeof arguments[0] === 'object') {
          for (var prop in eventName) {
            _removeEventListener.call(this, prop, eventName[prop]);
          }
        }
        else {
          _removeEventListener.call(this, eventName, handler);
        }
        return this;
      }

      /**
       * Fires event with an optional options object
       * @deprecated `fire` deprecated since 1.0.7 (use `trigger` instead)
       * @memberOf fabric.Observable
       * @alias trigger
       * @param {String} eventName Event name to fire
       * @param {Object} [options] Options object
       * @return {Self} thisArg
       * @chainable
       */
      function fire(eventName, options) {
        if (!this.__eventListeners) {
          return;
        }

        var listenersForEvent = this.__eventListeners[eventName];
        if (!listenersForEvent) {
          return;
        }

        for (var i = 0, len = listenersForEvent.length; i < len; i++) {
          listenersForEvent[i] && listenersForEvent[i].call(this, options || { });
        }
        this.__eventListeners[eventName] = listenersForEvent.filter(function(value) {
          return value !== false;
        });
        return this;
      }

      /**
       * @namespace fabric.Observable
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#events}
       * @see {@link http://fabricjs.com/events|Events demo}
       */
      fabric.Observable = {
        observe: observe,
        stopObserving: stopObserving,
        fire: fire,

        on: observe,
        off: stopObserving,
        trigger: fire
      };
    })();

    /**
     * @namespace fabric.Collection
     */
    fabric.Collection = {

      /**
       * Adds objects to collection, then renders canvas (if `renderOnAddRemove` is not `false`)
       * Objects should be instances of (or inherit from) fabric.Object
       * @param {...fabric.Object} object Zero or more fabric instances
       * @return {Self} thisArg
       */
      add: function () {
        this._objects.push.apply(this._objects, arguments);
        for (var i = 0, length = arguments.length; i < length; i++) {
          this._onObjectAdded(arguments[i]);
        }
        this.renderOnAddRemove && this.renderAll();
        return this;
      },

      /**
       * Inserts an object into collection at specified index, then renders canvas (if `renderOnAddRemove` is not `false`)
       * An object should be an instance of (or inherit from) fabric.Object
       * @param {Object} object Object to insert
       * @param {Number} index Index to insert object at
       * @param {Boolean} nonSplicing When `true`, no splicing (shifting) of objects occurs
       * @return {Self} thisArg
       * @chainable
       */
      insertAt: function (object, index, nonSplicing) {
        var objects = this.getObjects();
        if (nonSplicing) {
          objects[index] = object;
        }
        else {
          objects.splice(index, 0, object);
        }
        this._onObjectAdded(object);
        this.renderOnAddRemove && this.renderAll();
        return this;
      },

      /**
       * Removes objects from a collection, then renders canvas (if `renderOnAddRemove` is not `false`)
       * @param {...fabric.Object} object Zero or more fabric instances
       * @return {Self} thisArg
       * @chainable
       */
      remove: function() {
        var objects = this.getObjects(),
            index;

        for (var i = 0, length = arguments.length; i < length; i++) {
          index = objects.indexOf(arguments[i]);

          // only call onObjectRemoved if an object was actually removed
          Eif (index !== -1) {
            objects.splice(index, 1);
            this._onObjectRemoved(arguments[i]);
          }
        }

        this.renderOnAddRemove && this.renderAll();
        return this;
      },

      /**
       * Executes given function for each object in this group
       * @param {Function} callback
       *                   Callback invoked with current object as first argument,
       *                   index - as second and an array of all objects - as third.
       *                   Iteration happens in reverse order (for performance reasons).
       *                   Callback is invoked in a context of Global Object (e.g. `window`)
       *                   when no `context` argument is given
       *
       * @param {Object} context Context (aka thisObject)
       * @return {Self} thisArg
       */
      forEachObject: function(callback, context) {
        var objects = this.getObjects(),
            i = objects.length;
        while (i--) {
          callback.call(context, objects[i], i, objects);
        }
        return this;
      },

      /**
       * Returns an array of children objects of this instance
       * Type parameter introduced in 1.3.10
       * @param {String} [type] When specified, only objects of this type are returned
       * @return {Array}
       */
      getObjects: function(type) {
        if (typeof type === 'undefined') {
          return this._objects;
        }
        return this._objects.filter(function(o) {
          return o.type === type;
        });
      },

      /**
       * Returns object at specified index
       * @param {Number} index
       * @return {Self} thisArg
       */
      item: function (index) {
        return this.getObjects()[index];
      },

      /**
       * Returns true if collection contains no objects
       * @return {Boolean} true if collection is empty
       */
      isEmpty: function () {
        return this.getObjects().length === 0;
      },

      /**
       * Returns a size of a collection (i.e: length of an array containing its objects)
       * @return {Number} Collection size
       */
      size: function() {
        return this.getObjects().length;
      },

      /**
       * Returns true if collection contains an object
       * @param {Object} object Object to check against
       * @return {Boolean} `true` if collection contains an object
       */
      contains: function(object) {
        return this.getObjects().indexOf(object) > -1;
      },

      /**
       * Returns number representation of a collection complexity
       * @return {Number} complexity
       */
      complexity: function () {
        return this.getObjects().reduce(function (memo, current) {
          memo += current.complexity ? current.complexity() : 0;
          return memo;
        }, 0);
      }
    };

    (function(global) {

      var sqrt = Math.sqrt,
          atan2 = Math.atan2,
          pow = Math.pow,
          abs = Math.abs,
          PiBy180 = Math.PI / 180;

      /**
       * @namespace fabric.util
       */
      fabric.util = {

        /**
         * Removes value from an array.
         * Presence of value (and its position in an array) is determined via `Array.prototype.indexOf`
         * @static
         * @memberOf fabric.util
         * @param {Array} array
         * @param {Any} value
         * @return {Array} original array
         */
        removeFromArray: function(array, value) {
          var idx = array.indexOf(value);
          if (idx !== -1) {
            array.splice(idx, 1);
          }
          return array;
        },

        /**
         * Returns random number between 2 specified ones.
         * @static
         * @memberOf fabric.util
         * @param {Number} min lower limit
         * @param {Number} max upper limit
         * @return {Number} random value (between min and max)
         */
        getRandomInt: function(min, max) {
          return Math.floor(Math.random() * (max - min + 1)) + min;
        },

        /**
         * Transforms degrees to radians.
         * @static
         * @memberOf fabric.util
         * @param {Number} degrees value in degrees
         * @return {Number} value in radians
         */
        degreesToRadians: function(degrees) {
          return degrees * PiBy180;
        },

        /**
         * Transforms radians to degrees.
         * @static
         * @memberOf fabric.util
         * @param {Number} radians value in radians
         * @return {Number} value in degrees
         */
        radiansToDegrees: function(radians) {
          return radians / PiBy180;
        },

        /**
         * Rotates `point` around `origin` with `radians`
         * @static
         * @memberOf fabric.util
         * @param {fabric.Point} point The point to rotate
         * @param {fabric.Point} origin The origin of the rotation
         * @param {Number} radians The radians of the angle for the rotation
         * @return {fabric.Point} The new rotated point
         */
        rotatePoint: function(point, origin, radians) {
          point.subtractEquals(origin);
          var v = fabric.util.rotateVector(point, radians);
          return new fabric.Point(v.x, v.y).addEquals(origin);
        },

        /**
         * Rotates `vector` with `radians`
         * @static
         * @memberOf fabric.util
         * @param {Object} vector The vector to rotate (x and y)
         * @param {Number} radians The radians of the angle for the rotation
         * @return {Object} The new rotated point
         */
        rotateVector: function(vector, radians) {
          var sin = Math.sin(radians),
              cos = Math.cos(radians),
              rx = vector.x * cos - vector.y * sin,
              ry = vector.x * sin + vector.y * cos;
          return {
            x: rx,
            y: ry
          };
        },

        /**
         * Apply transform t to point p
         * @static
         * @memberOf fabric.util
         * @param  {fabric.Point} p The point to transform
         * @param  {Array} t The transform
         * @param  {Boolean} [ignoreOffset] Indicates that the offset should not be applied
         * @return {fabric.Point} The transformed point
         */
        transformPoint: function(p, t, ignoreOffset) {
          if (ignoreOffset) {
            return new fabric.Point(
              t[0] * p.x + t[2] * p.y,
              t[1] * p.x + t[3] * p.y
            );
          }
          return new fabric.Point(
            t[0] * p.x + t[2] * p.y + t[4],
            t[1] * p.x + t[3] * p.y + t[5]
          );
        },

        /**
         * Returns coordinates of points's bounding rectangle (left, top, width, height)
         * @param {Array} points 4 points array
         * @return {Object} Object with left, top, width, height properties
         */
        makeBoundingBoxFromPoints: function(points) {
          var xPoints = [points[0].x, points[1].x, points[2].x, points[3].x],
              minX = fabric.util.array.min(xPoints),
              maxX = fabric.util.array.max(xPoints),
              width = Math.abs(minX - maxX),
              yPoints = [points[0].y, points[1].y, points[2].y, points[3].y],
              minY = fabric.util.array.min(yPoints),
              maxY = fabric.util.array.max(yPoints),
              height = Math.abs(minY - maxY);

          return {
            left: minX,
            top: minY,
            width: width,
            height: height
          };
        },

        /**
         * Invert transformation t
         * @static
         * @memberOf fabric.util
         * @param {Array} t The transform
         * @return {Array} The inverted transform
         */
        invertTransform: function(t) {
          var a = 1 / (t[0] * t[3] - t[1] * t[2]),
              r = [a * t[3], -a * t[1], -a * t[2], a * t[0]],
              o = fabric.util.transformPoint({ x: t[4], y: t[5] }, r, true);
          r[4] = -o.x;
          r[5] = -o.y;
          return r;
        },

        /**
         * A wrapper around Number#toFixed, which contrary to native method returns number, not string.
         * @static
         * @memberOf fabric.util
         * @param {Number|String} number number to operate on
         * @param {Number} fractionDigits number of fraction digits to "leave"
         * @return {Number}
         */
        toFixed: function(number, fractionDigits) {
          return parseFloat(Number(number).toFixed(fractionDigits));
        },

        /**
         * Converts from attribute value to pixel value if applicable.
         * Returns converted pixels or original value not converted.
         * @param {Number|String} value number to operate on
         * @return {Number|String}
         */
        parseUnit: function(value, fontSize) {
          var unit = /\D{0,2}$/.exec(value),
              number = parseFloat(value);
          if (!fontSize) {
            fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;
          }
          switch (unit[0]) {
            case 'mm':
              return number * fabric.DPI / 25.4;

            case 'cm':
              return number * fabric.DPI / 2.54;

            case 'in':
              return number * fabric.DPI;

            case 'pt':
              return number * fabric.DPI / 72; // or * 4 / 3

            case 'pc':
              return number * fabric.DPI / 72 * 12; // or * 16

            case 'em':
              return number * fontSize;

            default:
              return number;
          }
        },

        /**
         * Function which always returns `false`.
         * @static
         * @memberOf fabric.util
         * @return {Boolean}
         */
        falseFunction: function() {
          return false;
        },

        /**
         * Returns klass "Class" object of given namespace
         * @memberOf fabric.util
         * @param {String} type Type of object (eg. 'circle')
         * @param {String} namespace Namespace to get klass "Class" object from
         * @return {Object} klass "Class"
         */
        getKlass: function(type, namespace) {
          // capitalize first letter only
          type = fabric.util.string.camelize(type.charAt(0).toUpperCase() + type.slice(1));
          return fabric.util.resolveNamespace(namespace)[type];
        },

        /**
         * Returns object of given namespace
         * @memberOf fabric.util
         * @param {String} namespace Namespace string e.g. 'fabric.Image.filter' or 'fabric'
         * @return {Object} Object for given namespace (default fabric)
         */
        resolveNamespace: function(namespace) {
          if (!namespace) {
            return fabric;
          }

          var parts = namespace.split('.'),
              len = parts.length,
              obj = global || fabric.window;

          for (var i = 0; i < len; ++i) {
            obj = obj[parts[i]];
          }

          return obj;
        },

        /**
         * Loads image element from given url and passes it to a callback
         * @memberOf fabric.util
         * @param {String} url URL representing an image
         * @param {Function} callback Callback; invoked with loaded image
         * @param {Any} [context] Context to invoke callback in
         * @param {Object} [crossOrigin] crossOrigin value to set image element to
         */
        loadImage: function(url, callback, context, crossOrigin) {
          if (!url) {
            callback && callback.call(context, url);
            return;
          }

          var img = fabric.util.createImage();

          /** @ignore */
          img.onload = function () {
            callback && callback.call(context, img);
            img = img.onload = img.onerror = null;
          };

          /** @ignore */
          img.onerror = function() {
            fabric.log('Error loading ' + img.src);
            callback && callback.call(context, null, true);
            img = img.onload = img.onerror = null;
          };

          // data-urls appear to be buggy with crossOrigin
          // https://github.com/kangax/fabric.js/commit/d0abb90f1cd5c5ef9d2a94d3fb21a22330da3e0a#commitcomment-4513767
          // see https://code.google.com/p/chromium/issues/detail?id=315152
          //     https://bugzilla.mozilla.org/show_bug.cgi?id=935069
          if (url.indexOf('data') !== 0 && crossOrigin) {
            img.crossOrigin = crossOrigin;
          }

          img.src = url;
        },

        /**
         * Creates corresponding fabric instances from their object representations
         * @static
         * @memberOf fabric.util
         * @param {Array} objects Objects to enliven
         * @param {Function} callback Callback to invoke when all objects are created
         * @param {String} namespace Namespace to get klass "Class" object from
         * @param {Function} reviver Method for further parsing of object elements,
         * called after each fabric object created.
         */
        enlivenObjects: function(objects, callback, namespace, reviver) {
          objects = objects || [ ];

          function onLoaded() {
            if (++numLoadedObjects === numTotalObjects) {
              callback && callback(enlivenedObjects);
            }
          }

          var enlivenedObjects = [ ],
              numLoadedObjects = 0,
              numTotalObjects = objects.length;

          if (!numTotalObjects) {
            callback && callback(enlivenedObjects);
            return;
          }

          objects.forEach(function (o, index) {
            // if sparse array
            Iif (!o || !o.type) {
              onLoaded();
              return;
            }
            var klass = fabric.util.getKlass(o.type, namespace);
            if (klass.async) {
              klass.fromObject(o, function (obj, error) {
                Eif (!error) {
                  enlivenedObjects[index] = obj;
                  reviver && reviver(o, enlivenedObjects[index]);
                }
                onLoaded();
              });
            }
            else {
              enlivenedObjects[index] = klass.fromObject(o);
              reviver && reviver(o, enlivenedObjects[index]);
              onLoaded();
            }
          });
        },

        /**
         * Groups SVG elements (usually those retrieved from SVG document)
         * @static
         * @memberOf fabric.util
         * @param {Array} elements SVG elements to group
         * @param {Object} [options] Options object
         * @return {fabric.Object|fabric.PathGroup}
         */
        groupSVGElements: function(elements, options, path) {
          var object;

          object = new fabric.PathGroup(elements, options);

          Iif (typeof path !== 'undefined') {
            object.setSourcePath(path);
          }
          return object;
        },

        /**
         * Populates an object with properties of another object
         * @static
         * @memberOf fabric.util
         * @param {Object} source Source object
         * @param {Object} destination Destination object
         * @return {Array} properties Propertie names to include
         */
        populateWithProperties: function(source, destination, properties) {
          if (properties && Object.prototype.toString.call(properties) === '[object Array]') {
            for (var i = 0, len = properties.length; i < len; i++) {
              if (properties[i] in source) {
                destination[properties[i]] = source[properties[i]];
              }
            }
          }
        },

        /**
         * Draws a dashed line between two points
         *
         * This method is used to draw dashed line around selection area.
         * See <a href="http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas">dotted stroke in canvas</a>
         *
         * @param {CanvasRenderingContext2D} ctx context
         * @param {Number} x  start x coordinate
         * @param {Number} y start y coordinate
         * @param {Number} x2 end x coordinate
         * @param {Number} y2 end y coordinate
         * @param {Array} da dash array pattern
         */
        drawDashedLine: function(ctx, x, y, x2, y2, da) {
          var dx = x2 - x,
              dy = y2 - y,
              len = sqrt(dx * dx + dy * dy),
              rot = atan2(dy, dx),
              dc = da.length,
              di = 0,
              draw = true;

          ctx.save();
          ctx.translate(x, y);
          ctx.moveTo(0, 0);
          ctx.rotate(rot);

          x = 0;
          while (len > x) {
            x += da[di++ % dc];
            if (x > len) {
              x = len;
            }
            ctx[draw ? 'lineTo' : 'moveTo'](x, 0);
            draw = !draw;
          }

          ctx.restore();
        },

        /**
         * Creates canvas element and initializes it via excanvas if necessary
         * @static
         * @memberOf fabric.util
         * @param {CanvasElement} [canvasEl] optional canvas element to initialize;
         * when not given, element is created implicitly
         * @return {CanvasElement} initialized canvas element
         */
        createCanvasElement: function(canvasEl) {
          canvasEl || (canvasEl = fabric.document.createElement('canvas'));
          //jscs:disable requireCamelCaseOrUpperCaseIdentifiers
          Iif (!canvasEl.getContext && typeof G_vmlCanvasManager !== 'undefined') {
            G_vmlCanvasManager.initElement(canvasEl);
          }
          //jscs:enable requireCamelCaseOrUpperCaseIdentifiers
          return canvasEl;
        },

        /**
         * Creates image element (works on client and node)
         * @static
         * @memberOf fabric.util
         * @return {HTMLImageElement} HTML image element
         */
        createImage: function() {
          return fabric.isLikelyNode
            ? new (require('canvas').Image)()
            : fabric.document.createElement('img');
        },

        /**
         * Creates accessors (getXXX, setXXX) for a "class", based on "stateProperties" array
         * @static
         * @memberOf fabric.util
         * @param {Object} klass "Class" to create accessors for
         */
        createAccessors: function(klass) {
          var proto = klass.prototype;

          for (var i = proto.stateProperties.length; i--; ) {

            var propName = proto.stateProperties[i],
                capitalizedPropName = propName.charAt(0).toUpperCase() + propName.slice(1),
                setterName = 'set' + capitalizedPropName,
                getterName = 'get' + capitalizedPropName;

            // using `new Function` for better introspection
            if (!proto[getterName]) {
              proto[getterName] = (function(property) {
                return new Function('return this.get("' + property + '")');
              })(propName);
            }
            if (!proto[setterName]) {
              proto[setterName] = (function(property) {
                return new Function('value', 'return this.set("' + property + '", value)');
              })(propName);
            }
          }
        },

        /**
         * @static
         * @memberOf fabric.util
         * @param {fabric.Object} receiver Object implementing `clipTo` method
         * @param {CanvasRenderingContext2D} ctx Context to clip
         */
        clipContext: function(receiver, ctx) {
          ctx.save();
          ctx.beginPath();
          receiver.clipTo(ctx);
          ctx.clip();
        },

        /**
         * Multiply matrix A by matrix B to nest transformations
         * @static
         * @memberOf fabric.util
         * @param  {Array} a First transformMatrix
         * @param  {Array} b Second transformMatrix
         * @param  {Boolean} is2x2 flag to multiply matrices as 2x2 matrices
         * @return {Array} The product of the two transform matrices
         */
        multiplyTransformMatrices: function(a, b, is2x2) {
          // Matrix multiply a * b
          return [
            a[0] * b[0] + a[2] * b[1],
            a[1] * b[0] + a[3] * b[1],
            a[0] * b[2] + a[2] * b[3],
            a[1] * b[2] + a[3] * b[3],
            is2x2 ? 0 : a[0] * b[4] + a[2] * b[5] + a[4],
            is2x2 ? 0 : a[1] * b[4] + a[3] * b[5] + a[5]
          ];
        },

        /**
         * Decomposes standard 2x2 matrix into transform componentes
         * @static
         * @memberOf fabric.util
         * @param  {Array} a transformMatrix
         * @return {Object} Components of transform
         */
        qrDecompose: function(a) {
          var angle = atan2(a[1], a[0]),
              denom = pow(a[0], 2) + pow(a[1], 2),
              scaleX = sqrt(denom),
              scaleY = (a[0] * a[3] - a[2] * a [1]) / scaleX,
              skewX = atan2(a[0] * a[2] + a[1] * a [3], denom);
          return {
            angle: angle  / PiBy180,
            scaleX: scaleX,
            scaleY: scaleY,
            skewX: skewX / PiBy180,
            skewY: 0,
            translateX: a[4],
            translateY: a[5]
          };
        },

        customTransformMatrix: function(scaleX, scaleY, skewX) {
          var skewMatrixX = [1, 0, abs(Math.tan(skewX * PiBy180)), 1],
              scaleMatrix = [abs(scaleX), 0, 0, abs(scaleY)];
          return fabric.util.multiplyTransformMatrices(scaleMatrix, skewMatrixX, true);
        },

        resetObjectTransform: function (target) {
          target.scaleX = 1;
          target.scaleY = 1;
          target.skewX = 0;
          target.skewY = 0;
          target.flipX = false;
          target.flipY = false;
          target.setAngle(0);
        },

        /**
         * Returns string representation of function body
         * @param {Function} fn Function to get body of
         * @return {String} Function body
         */
        getFunctionBody: function(fn) {
          return (String(fn).match(/function[^{]*\{([\s\S]*)\}/) || {})[1];
        },

        /**
         * Returns true if context has transparent pixel
         * at specified location (taking tolerance into account)
         * @param {CanvasRenderingContext2D} ctx context
         * @param {Number} x x coordinate
         * @param {Number} y y coordinate
         * @param {Number} tolerance Tolerance
         */
        isTransparent: function(ctx, x, y, tolerance) {

          // If tolerance is > 0 adjust start coords to take into account.
          // If moves off Canvas fix to 0
          Iif (tolerance > 0) {
            if (x > tolerance) {
              x -= tolerance;
            }
            else {
              x = 0;
            }
            if (y > tolerance) {
              y -= tolerance;
            }
            else {
              y = 0;
            }
          }

          var _isTransparent = true,
              imageData = ctx.getImageData(x, y, (tolerance * 2) || 1, (tolerance * 2) || 1);

          // Split image data - for tolerance > 1, pixelDataSize = 4;
          for (var i = 3, l = imageData.data.length; i < l; i += 4) {
            var temp = imageData.data[i];
            _isTransparent = temp <= 0;
            if (_isTransparent === false) {
              break; // Stop if colour found
            }
          }

          imageData = null;

          return _isTransparent;
        },

        /**
         * Parse preserveAspectRatio attribute from element
         * @param {string} attribute to be parsed
         * @return {Object} an object containing align and meetOrSlice attribute
         */
        parsePreserveAspectRatioAttribute: function(attribute) {
          var meetOrSlice = 'meet', alignX = 'Mid', alignY = 'Mid',
              aspectRatioAttrs = attribute.split(' '), align;

          if (aspectRatioAttrs && aspectRatioAttrs.length) {
            meetOrSlice = aspectRatioAttrs.pop();
            if (meetOrSlice !== 'meet' && meetOrSlice !== 'slice') {
              align = meetOrSlice;
              meetOrSlice = 'meet';
            }
            else if (aspectRatioAttrs.length) {
              align = aspectRatioAttrs.pop();
            }
          }
          //divide align in alignX and alignY
          alignX = align !== 'none' ? align.slice(1, 4) : 'none';
          alignY = align !== 'none' ? align.slice(5, 8) : 'none';
          return {
            meetOrSlice: meetOrSlice,
            alignX: alignX,
            alignY: alignY
          };
        }
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function() {

      var arcToSegmentsCache = { },
          segmentToBezierCache = { },
          boundsOfCurveCache = { },
          _join = Array.prototype.join;

      /* Adapted from http://dxr.mozilla.org/mozilla-central/source/content/svg/content/src/nsSVGPathDataParser.cpp
       * by Andrea Bogazzi code is under MPL. if you don't have a copy of the license you can take it here
       * http://mozilla.org/MPL/2.0/
       */
      function arcToSegments(toX, toY, rx, ry, large, sweep, rotateX) {
        var argsString = _join.call(arguments);
        if (arcToSegmentsCache[argsString]) {
          return arcToSegmentsCache[argsString];
        }

        var PI = Math.PI, th = rotateX * PI / 180,
            sinTh = Math.sin(th),
            cosTh = Math.cos(th),
            fromX = 0, fromY = 0;

        rx = Math.abs(rx);
        ry = Math.abs(ry);

        var px = -cosTh * toX * 0.5 - sinTh * toY * 0.5,
            py = -cosTh * toY * 0.5 + sinTh * toX * 0.5,
            rx2 = rx * rx, ry2 = ry * ry, py2 = py * py, px2 = px * px,
            pl = rx2 * ry2 - rx2 * py2 - ry2 * px2,
            root = 0;

        if (pl < 0) {
          var s = Math.sqrt(1 - pl/(rx2 * ry2));
          rx *= s;
          ry *= s;
        }
        else {
          root = (large === sweep ? -1.0 : 1.0) *
                  Math.sqrt( pl /(rx2 * py2 + ry2 * px2));
        }

        var cx = root * rx * py / ry,
            cy = -root * ry * px / rx,
            cx1 = cosTh * cx - sinTh * cy + toX * 0.5,
            cy1 = sinTh * cx + cosTh * cy + toY * 0.5,
            mTheta = calcVectorAngle(1, 0, (px - cx) / rx, (py - cy) / ry),
            dtheta = calcVectorAngle((px - cx) / rx, (py - cy) / ry, (-px - cx) / rx, (-py - cy) / ry);

        if (sweep === 0 && dtheta > 0) {
          dtheta -= 2 * PI;
        }
        else if (sweep === 1 && dtheta < 0) {
          dtheta += 2 * PI;
        }

        // Convert into cubic bezier segments <= 90deg
        var segments = Math.ceil(Math.abs(dtheta / PI * 2)),
            result = [], mDelta = dtheta / segments,
            mT = 8 / 3 * Math.sin(mDelta / 4) * Math.sin(mDelta / 4) / Math.sin(mDelta / 2),
            th3 = mTheta + mDelta;

        for (var i = 0; i < segments; i++) {
          result[i] = segmentToBezier(mTheta, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY);
          fromX = result[i][4];
          fromY = result[i][5];
          mTheta = th3;
          th3 += mDelta;
        }
        arcToSegmentsCache[argsString] = result;
        return result;
      }

      function segmentToBezier(th2, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY) {
        var argsString2 = _join.call(arguments);
        if (segmentToBezierCache[argsString2]) {
          return segmentToBezierCache[argsString2];
        }

        var costh2 = Math.cos(th2),
            sinth2 = Math.sin(th2),
            costh3 = Math.cos(th3),
            sinth3 = Math.sin(th3),
            toX = cosTh * rx * costh3 - sinTh * ry * sinth3 + cx1,
            toY = sinTh * rx * costh3 + cosTh * ry * sinth3 + cy1,
            cp1X = fromX + mT * ( - cosTh * rx * sinth2 - sinTh * ry * costh2),
            cp1Y = fromY + mT * ( - sinTh * rx * sinth2 + cosTh * ry * costh2),
            cp2X = toX + mT * ( cosTh * rx * sinth3 + sinTh * ry * costh3),
            cp2Y = toY + mT * ( sinTh * rx * sinth3 - cosTh * ry * costh3);

        segmentToBezierCache[argsString2] = [
          cp1X, cp1Y,
          cp2X, cp2Y,
          toX, toY
        ];
        return segmentToBezierCache[argsString2];
      }

      /*
       * Private
       */
      function calcVectorAngle(ux, uy, vx, vy) {
        var ta = Math.atan2(uy, ux),
            tb = Math.atan2(vy, vx);
        if (tb >= ta) {
          return tb - ta;
        }
        else {
          return 2 * Math.PI - (ta - tb);
        }
      }

      /**
       * Draws arc
       * @param {CanvasRenderingContext2D} ctx
       * @param {Number} fx
       * @param {Number} fy
       * @param {Array} coords
       */
      fabric.util.drawArc = function(ctx, fx, fy, coords) {
        var rx = coords[0],
            ry = coords[1],
            rot = coords[2],
            large = coords[3],
            sweep = coords[4],
            tx = coords[5],
            ty = coords[6],
            segs = [[ ], [ ], [ ], [ ]],
            segsNorm = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);

        for (var i = 0, len = segsNorm.length; i < len; i++) {
          segs[i][0] = segsNorm[i][0] + fx;
          segs[i][1] = segsNorm[i][1] + fy;
          segs[i][2] = segsNorm[i][2] + fx;
          segs[i][3] = segsNorm[i][3] + fy;
          segs[i][4] = segsNorm[i][4] + fx;
          segs[i][5] = segsNorm[i][5] + fy;
          ctx.bezierCurveTo.apply(ctx, segs[i]);
        }
      };

      /**
       * Calculate bounding box of a elliptic-arc
       * @param {Number} fx start point of arc
       * @param {Number} fy
       * @param {Number} rx horizontal radius
       * @param {Number} ry vertical radius
       * @param {Number} rot angle of horizontal axe
       * @param {Number} large 1 or 0, whatever the arc is the big or the small on the 2 points
       * @param {Number} sweep 1 or 0, 1 clockwise or counterclockwise direction
       * @param {Number} tx end point of arc
       * @param {Number} ty
       */
      fabric.util.getBoundsOfArc = function(fx, fy, rx, ry, rot, large, sweep, tx, ty) {

        var fromX = 0, fromY = 0, bound = [ ], bounds = [ ],
        segs = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot),
        boundCopy = [[ ], [ ]];

        for (var i = 0, len = segs.length; i < len; i++) {
          bound = getBoundsOfCurve(fromX, fromY, segs[i][0], segs[i][1], segs[i][2], segs[i][3], segs[i][4], segs[i][5]);
          boundCopy[0].x = bound[0].x + fx;
          boundCopy[0].y = bound[0].y + fy;
          boundCopy[1].x = bound[1].x + fx;
          boundCopy[1].y = bound[1].y + fy;
          bounds.push(boundCopy[0]);
          bounds.push(boundCopy[1]);
          fromX = segs[i][4];
          fromY = segs[i][5];
        }
        return bounds;
      };

      /**
       * Calculate bounding box of a beziercurve
       * @param {Number} x0 starting point
       * @param {Number} y0
       * @param {Number} x1 first control point
       * @param {Number} y1
       * @param {Number} x2 secondo control point
       * @param {Number} y2
       * @param {Number} x3 end of beizer
       * @param {Number} y3
       */
      // taken from http://jsbin.com/ivomiq/56/edit  no credits available for that.
      function getBoundsOfCurve(x0, y0, x1, y1, x2, y2, x3, y3) {
        var argsString = _join.call(arguments);
        if (boundsOfCurveCache[argsString]) {
          return boundsOfCurveCache[argsString];
        }

        var sqrt = Math.sqrt,
            min = Math.min, max = Math.max,
            abs = Math.abs, tvalues = [ ],
            bounds = [[ ], [ ]],
            a, b, c, t, t1, t2, b2ac, sqrtb2ac;

        b = 6 * x0 - 12 * x1 + 6 * x2;
        a = -3 * x0 + 9 * x1 - 9 * x2 + 3 * x3;
        c = 3 * x1 - 3 * x0;

        for (var i = 0; i < 2; ++i) {
          if (i > 0) {
            b = 6 * y0 - 12 * y1 + 6 * y2;
            a = -3 * y0 + 9 * y1 - 9 * y2 + 3 * y3;
            c = 3 * y1 - 3 * y0;
          }

          Iif (abs(a) < 1e-12) {
            if (abs(b) < 1e-12) {
              continue;
            }
            t = -c / b;
            if (0 < t && t < 1) {
              tvalues.push(t);
            }
            continue;
          }
          b2ac = b * b - 4 * c * a;
          if (b2ac < 0) {
            continue;
          }
          sqrtb2ac = sqrt(b2ac);
          t1 = (-b + sqrtb2ac) / (2 * a);
          if (0 < t1 && t1 < 1) {
            tvalues.push(t1);
          }
          t2 = (-b - sqrtb2ac) / (2 * a);
          if (0 < t2 && t2 < 1) {
            tvalues.push(t2);
          }
        }

        var x, y, j = tvalues.length, jlen = j, mt;
        while (j--) {
          t = tvalues[j];
          mt = 1 - t;
          x = (mt * mt * mt * x0) + (3 * mt * mt * t * x1) + (3 * mt * t * t * x2) + (t * t * t * x3);
          bounds[0][j] = x;

          y = (mt * mt * mt * y0) + (3 * mt * mt * t * y1) + (3 * mt * t * t * y2) + (t * t * t * y3);
          bounds[1][j] = y;
        }

        bounds[0][jlen] = x0;
        bounds[1][jlen] = y0;
        bounds[0][jlen + 1] = x3;
        bounds[1][jlen + 1] = y3;
        var result = [
          {
            x: min.apply(null, bounds[0]),
            y: min.apply(null, bounds[1])
          },
          {
            x: max.apply(null, bounds[0]),
            y: max.apply(null, bounds[1])
          }
        ];
        boundsOfCurveCache[argsString] = result;
        return result;
      }

      fabric.util.getBoundsOfCurve = getBoundsOfCurve;

    })();

    (function() {

      var slice = Array.prototype.slice;

      /* _ES5_COMPAT_START_ */

      Iif (!Array.prototype.indexOf) {
        /**
         * Finds index of an element in an array
         * @param {Any} searchElement
         * @param {Number} [fromIndex]
         * @return {Number}
         */
        Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
          if (this === void 0 || this === null) {
            throw new TypeError();
          }
          var t = Object(this), len = t.length >>> 0;
          if (len === 0) {
            return -1;
          }
          var n = 0;
          if (arguments.length > 0) {
            n = Number(arguments[1]);
            if (n !== n) { // shortcut for verifying if it's NaN
              n = 0;
            }
            else if (n !== 0 && n !== Number.POSITIVE_INFINITY && n !== Number.NEGATIVE_INFINITY) {
              n = (n > 0 || -1) * Math.floor(Math.abs(n));
            }
          }
          if (n >= len) {
            return -1;
          }
          var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
          for (; k < len; k++) {
            if (k in t && t[k] === searchElement) {
              return k;
            }
          }
          return -1;
        };
      }

      Iif (!Array.prototype.forEach) {
        /**
         * Iterates an array, invoking callback for each element
         * @param {Function} fn Callback to invoke for each element
         * @param {Object} [context] Context to invoke callback in
         * @return {Array}
         */
        Array.prototype.forEach = function(fn, context) {
          for (var i = 0, len = this.length >>> 0; i < len; i++) {
            if (i in this) {
              fn.call(context, this[i], i, this);
            }
          }
        };
      }

      Iif (!Array.prototype.map) {
        /**
         * Returns a result of iterating over an array, invoking callback for each element
         * @param {Function} fn Callback to invoke for each element
         * @param {Object} [context] Context to invoke callback in
         * @return {Array}
         */
        Array.prototype.map = function(fn, context) {
          var result = [ ];
          for (var i = 0, len = this.length >>> 0; i < len; i++) {
            if (i in this) {
              result[i] = fn.call(context, this[i], i, this);
            }
          }
          return result;
        };
      }

      Iif (!Array.prototype.every) {
        /**
         * Returns true if a callback returns truthy value for all elements in an array
         * @param {Function} fn Callback to invoke for each element
         * @param {Object} [context] Context to invoke callback in
         * @return {Boolean}
         */
        Array.prototype.every = function(fn, context) {
          for (var i = 0, len = this.length >>> 0; i < len; i++) {
            if (i in this && !fn.call(context, this[i], i, this)) {
              return false;
            }
          }
          return true;
        };
      }

      Iif (!Array.prototype.some) {
        /**
         * Returns true if a callback returns truthy value for at least one element in an array
         * @param {Function} fn Callback to invoke for each element
         * @param {Object} [context] Context to invoke callback in
         * @return {Boolean}
         */
        Array.prototype.some = function(fn, context) {
          for (var i = 0, len = this.length >>> 0; i < len; i++) {
            if (i in this && fn.call(context, this[i], i, this)) {
              return true;
            }
          }
          return false;
        };
      }

      Iif (!Array.prototype.filter) {
        /**
         * Returns the result of iterating over elements in an array
         * @param {Function} fn Callback to invoke for each element
         * @param {Object} [context] Context to invoke callback in
         * @return {Array}
         */
        Array.prototype.filter = function(fn, context) {
          var result = [ ], val;
          for (var i = 0, len = this.length >>> 0; i < len; i++) {
            if (i in this) {
              val = this[i]; // in case fn mutates this
              if (fn.call(context, val, i, this)) {
                result.push(val);
              }
            }
          }
          return result;
        };
      }

      Iif (!Array.prototype.reduce) {
        /**
         * Returns "folded" (reduced) result of iterating over elements in an array
         * @param {Function} fn Callback to invoke for each element
         * @param {Object} [initial] Object to use as the first argument to the first call of the callback
         * @return {Any}
         */
        Array.prototype.reduce = function(fn /*, initial*/) {
          var len = this.length >>> 0,
              i = 0,
              rv;

          if (arguments.length > 1) {
            rv = arguments[1];
          }
          else {
            do {
              if (i in this) {
                rv = this[i++];
                break;
              }
              // if array contains no values, no initial value to return
              if (++i >= len) {
                throw new TypeError();
              }
            }
            while (true);
          }
          for (; i < len; i++) {
            if (i in this) {
              rv = fn.call(null, rv, this[i], i, this);
            }
          }
          return rv;
        };
      }

      /* _ES5_COMPAT_END_ */

      /**
       * Invokes method on all items in a given array
       * @memberOf fabric.util.array
       * @param {Array} array Array to iterate over
       * @param {String} method Name of a method to invoke
       * @return {Array}
       */
      function invoke(array, method) {
        var args = slice.call(arguments, 2), result = [ ];
        for (var i = 0, len = array.length; i < len; i++) {
          result[i] = args.length ? array[i][method].apply(array[i], args) : array[i][method].call(array[i]);
        }
        return result;
      }

      /**
       * Finds maximum value in array (not necessarily "first" one)
       * @memberOf fabric.util.array
       * @param {Array} array Array to iterate over
       * @param {String} byProperty
       * @return {Any}
       */
      function max(array, byProperty) {
        return find(array, byProperty, function(value1, value2) {
          return value1 >= value2;
        });
      }

      /**
       * Finds minimum value in array (not necessarily "first" one)
       * @memberOf fabric.util.array
       * @param {Array} array Array to iterate over
       * @param {String} byProperty
       * @return {Any}
       */
      function min(array, byProperty) {
        return find(array, byProperty, function(value1, value2) {
          return value1 < value2;
        });
      }

      /**
       * @private
       */
      function fill(array, value) {
        var k = array.length;
        while (k--) {
          array[k] = value;
        }
        return array;
      }

      /**
       * @private
       */
      function find(array, byProperty, condition) {
        if (!array || array.length === 0) {
          return;
        }

        var i = array.length - 1,
            result = byProperty ? array[i][byProperty] : array[i];
        if (byProperty) {
          while (i--) {
            if (condition(array[i][byProperty], result)) {
              result = array[i][byProperty];
            }
          }
        }
        else {
          while (i--) {
            if (condition(array[i], result)) {
              result = array[i];
            }
          }
        }
        return result;
      }

      /**
       * @namespace fabric.util.array
       */
      fabric.util.array = {
        fill: fill,
        invoke: invoke,
        min: min,
        max: max
      };

    })();

    (function() {

      /**
       * Copies all enumerable properties of one object to another
       * @memberOf fabric.util.object
       * @param {Object} destination Where to copy to
       * @param {Object} source Where to copy from
       * @return {Object}
       */
      function extend(destination, source) {
        // JScript DontEnum bug is not taken care of
        for (var property in source) {
          destination[property] = source[property];
        }
        return destination;
      }

      /**
       * Creates an empty object and copies all enumerable properties of another object to it
       * @memberOf fabric.util.object
       * @param {Object} object Object to clone
       * @return {Object}
       */
      function clone(object) {
        return extend({ }, object);
      }

      /** @namespace fabric.util.object */
      fabric.util.object = {
        extend: extend,
        clone: clone
      };

    })();

    (function() {

      /* _ES5_COMPAT_START_ */
      Iif (!String.prototype.trim) {
        /**
         * Trims a string (removing whitespace from the beginning and the end)
         * @function external:String#trim
         * @see <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Trim">String#trim on MDN</a>
         */
        String.prototype.trim = function () {
          // this trim is not fully ES3 or ES5 compliant, but it should cover most cases for now
          return this.replace(/^[\s\xA0]+/, '').replace(/[\s\xA0]+$/, '');
        };
      }
      /* _ES5_COMPAT_END_ */

      /**
       * Camelizes a string
       * @memberOf fabric.util.string
       * @param {String} string String to camelize
       * @return {String} Camelized version of a string
       */
      function camelize(string) {
        return string.replace(/-+(.)?/g, function(match, character) {
          return character ? character.toUpperCase() : '';
        });
      }

      /**
       * Capitalizes a string
       * @memberOf fabric.util.string
       * @param {String} string String to capitalize
       * @param {Boolean} [firstLetterOnly] If true only first letter is capitalized
       * and other letters stay untouched, if false first letter is capitalized
       * and other letters are converted to lowercase.
       * @return {String} Capitalized version of a string
       */
      function capitalize(string, firstLetterOnly) {
        return string.charAt(0).toUpperCase() +
          (firstLetterOnly ? string.slice(1) : string.slice(1).toLowerCase());
      }

      /**
       * Escapes XML in a string
       * @memberOf fabric.util.string
       * @param {String} string String to escape
       * @return {String} Escaped version of a string
       */
      function escapeXml(string) {
        return string.replace(/&/g, '&amp;')
           .replace(/"/g, '&quot;')
           .replace(/'/g, '&apos;')
           .replace(/</g, '&lt;')
           .replace(/>/g, '&gt;');
      }

      /**
       * String utilities
       * @namespace fabric.util.string
       */
      fabric.util.string = {
        camelize: camelize,
        capitalize: capitalize,
        escapeXml: escapeXml
      };
    }());

    /* _ES5_COMPAT_START_ */
    (function() {

      var slice = Array.prototype.slice,
          apply = Function.prototype.apply,
          Dummy = function() { };

      Iif (!Function.prototype.bind) {
        /**
         * Cross-browser approximation of ES5 Function.prototype.bind (not fully spec conforming)
         * @see <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind">Function#bind on MDN</a>
         * @param {Object} thisArg Object to bind function to
         * @param {Any[]} Values to pass to a bound function
         * @return {Function}
         */
        Function.prototype.bind = function(thisArg) {
          var _this = this, args = slice.call(arguments, 1), bound;
          if (args.length) {
            bound = function() {
              return apply.call(_this, this instanceof Dummy ? this : thisArg, args.concat(slice.call(arguments)));
            };
          }
          else {
            /** @ignore */
            bound = function() {
              return apply.call(_this, this instanceof Dummy ? this : thisArg, arguments);
            };
          }
          Dummy.prototype = this.prototype;
          bound.prototype = new Dummy();

          return bound;
        };
      }

    })();
    /* _ES5_COMPAT_END_ */

    (function() {

      var slice = Array.prototype.slice, emptyFunction = function() { },

          IS_DONTENUM_BUGGY = (function() {
            for (var p in { toString: 1 }) {
              Eif (p === 'toString') {
                return false;
              }
            }
            return true;
          })(),

          /** @ignore */
          addMethods = function(klass, source, parent) {
            for (var property in source) {

              if (property in klass.prototype &&
                  typeof klass.prototype[property] === 'function' &&
                  (source[property] + '').indexOf('callSuper') > -1) {

                klass.prototype[property] = (function(property) {
                  return function() {

                    var superclass = this.constructor.superclass;
                    this.constructor.superclass = parent;
                    var returnValue = source[property].apply(this, arguments);
                    this.constructor.superclass = superclass;

                    if (property !== 'initialize') {
                      return returnValue;
                    }
                  };
                })(property);
              }
              else {
                klass.prototype[property] = source[property];
              }

              Iif (IS_DONTENUM_BUGGY) {
                if (source.toString !== Object.prototype.toString) {
                  klass.prototype.toString = source.toString;
                }
                if (source.valueOf !== Object.prototype.valueOf) {
                  klass.prototype.valueOf = source.valueOf;
                }
              }
            }
          };

      function Subclass() { }

      function callSuper(methodName) {
        var fn = this.constructor.superclass.prototype[methodName];
        return (arguments.length > 1)
          ? fn.apply(this, slice.call(arguments, 1))
          : fn.call(this);
      }

      /**
       * Helper for creation of "classes".
       * @memberOf fabric.util
       * @param {Function} [parent] optional "Class" to inherit from
       * @param {Object} [properties] Properties shared by all instances of this class
       *                  (be careful modifying objects defined here as this would affect all instances)
       */
      function createClass() {
        var parent = null,
            properties = slice.call(arguments, 0);

        if (typeof properties[0] === 'function') {
          parent = properties.shift();
        }
        function klass() {
          this.initialize.apply(this, arguments);
        }

        klass.superclass = parent;
        klass.subclasses = [ ];

        if (parent) {
          Subclass.prototype = parent.prototype;
          klass.prototype = new Subclass();
          parent.subclasses.push(klass);
        }
        for (var i = 0, length = properties.length; i < length; i++) {
          addMethods(klass, properties[i], parent);
        }
        if (!klass.prototype.initialize) {
          klass.prototype.initialize = emptyFunction;
        }
        klass.prototype.constructor = klass;
        klass.prototype.callSuper = callSuper;
        return klass;
      }

      fabric.util.createClass = createClass;
    })();

    (function () {

      var unknown = 'unknown';

      /* EVENT HANDLING */

      function areHostMethods(object) {
        var methodNames = Array.prototype.slice.call(arguments, 1),
            t, i, len = methodNames.length;
        for (i = 0; i < len; i++) {
          t = typeof object[methodNames[i]];
          if (!(/^(?:function|object|unknown)$/).test(t)) {
            return false;
          }
        }
        return true;
      }

      /** @ignore */
      var getElement,
          setElement,
          getUniqueId = (function () {
            var uid = 0;
            return function (element) {
              return element.__uniqueID || (element.__uniqueID = 'uniqueID__' + uid++);
            };
          })();

      (function () {
        var elements = { };
        /** @ignore */
        getElement = function (uid) {
          return elements[uid];
        };
        /** @ignore */
        setElement = function (uid, element) {
          elements[uid] = element;
        };
      })();

      function createListener(uid, handler) {
        return {
          handler: handler,
          wrappedHandler: createWrappedHandler(uid, handler)
        };
      }

      function createWrappedHandler(uid, handler) {
        return function (e) {
          handler.call(getElement(uid), e || fabric.window.event);
        };
      }

      function createDispatcher(uid, eventName) {
        return function (e) {
          if (handlers[uid] && handlers[uid][eventName]) {
            var handlersForEvent = handlers[uid][eventName];
            for (var i = 0, len = handlersForEvent.length; i < len; i++) {
              handlersForEvent[i].call(this, e || fabric.window.event);
            }
          }
        };
      }

      var shouldUseAddListenerRemoveListener = (
            areHostMethods(fabric.document.documentElement, 'addEventListener', 'removeEventListener') &&
            areHostMethods(fabric.window, 'addEventListener', 'removeEventListener')),

          shouldUseAttachEventDetachEvent = (
            areHostMethods(fabric.document.documentElement, 'attachEvent', 'detachEvent') &&
            areHostMethods(fabric.window, 'attachEvent', 'detachEvent')),

          // IE branch
          listeners = { },

          // DOM L0 branch
          handlers = { },

          addListener, removeListener;

      Eif (shouldUseAddListenerRemoveListener) {
        /** @ignore */
        addListener = function (element, eventName, handler) {
          element.addEventListener(eventName, handler, false);
        };
        /** @ignore */
        removeListener = function (element, eventName, handler) {
          element.removeEventListener(eventName, handler, false);
        };
      }

      else if (shouldUseAttachEventDetachEvent) {
        /** @ignore */
        addListener = function (element, eventName, handler) {
          var uid = getUniqueId(element);
          setElement(uid, element);
          if (!listeners[uid]) {
            listeners[uid] = { };
          }
          if (!listeners[uid][eventName]) {
            listeners[uid][eventName] = [ ];

          }
          var listener = createListener(uid, handler);
          listeners[uid][eventName].push(listener);
          element.attachEvent('on' + eventName, listener.wrappedHandler);
        };
        /** @ignore */
        removeListener = function (element, eventName, handler) {
          var uid = getUniqueId(element), listener;
          if (listeners[uid] && listeners[uid][eventName]) {
            for (var i = 0, len = listeners[uid][eventName].length; i < len; i++) {
              listener = listeners[uid][eventName][i];
              if (listener && listener.handler === handler) {
                element.detachEvent('on' + eventName, listener.wrappedHandler);
                listeners[uid][eventName][i] = null;
              }
            }
          }
        };
      }
      else {
        /** @ignore */
        addListener = function (element, eventName, handler) {
          var uid = getUniqueId(element);
          if (!handlers[uid]) {
            handlers[uid] = { };
          }
          if (!handlers[uid][eventName]) {
            handlers[uid][eventName] = [ ];
            var existingHandler = element['on' + eventName];
            if (existingHandler) {
              handlers[uid][eventName].push(existingHandler);
            }
            element['on' + eventName] = createDispatcher(uid, eventName);
          }
          handlers[uid][eventName].push(handler);
        };
        /** @ignore */
        removeListener = function (element, eventName, handler) {
          var uid = getUniqueId(element);
          if (handlers[uid] && handlers[uid][eventName]) {
            var handlersForEvent = handlers[uid][eventName];
            for (var i = 0, len = handlersForEvent.length; i < len; i++) {
              if (handlersForEvent[i] === handler) {
                handlersForEvent.splice(i, 1);
              }
            }
          }
        };
      }

      /**
       * Adds an event listener to an element
       * @function
       * @memberOf fabric.util
       * @param {HTMLElement} element
       * @param {String} eventName
       * @param {Function} handler
       */
      fabric.util.addListener = addListener;

      /**
       * Removes an event listener from an element
       * @function
       * @memberOf fabric.util
       * @param {HTMLElement} element
       * @param {String} eventName
       * @param {Function} handler
       */
      fabric.util.removeListener = removeListener;

      /**
       * Cross-browser wrapper for getting event's coordinates
       * @memberOf fabric.util
       * @param {Event} event Event object
       */
      function getPointer(event) {
        event || (event = fabric.window.event);

        var element = event.target ||
                      (typeof event.srcElement !== unknown ? event.srcElement : null),

            scroll = fabric.util.getScrollLeftTop(element);

        return {
          x: pointerX(event) + scroll.left,
          y: pointerY(event) + scroll.top
        };
      }

      var pointerX = function(event) {
        // looks like in IE (<9) clientX at certain point (apparently when mouseup fires on VML element)
        // is represented as COM object, with all the consequences, like "unknown" type and error on [[Get]]
        // need to investigate later
        return (typeof event.clientX !== unknown ? event.clientX : 0);
      },

      pointerY = function(event) {
        return (typeof event.clientY !== unknown ? event.clientY : 0);
      };

      function _getPointer(event, pageProp, clientProp) {
        var touchProp = event.type === 'touchend' ? 'changedTouches' : 'touches';

        return (event[touchProp] && event[touchProp][0]
          ? (event[touchProp][0][pageProp] - (event[touchProp][0][pageProp] - event[touchProp][0][clientProp]))
            || event[clientProp]
          : event[clientProp]);
      }

      Iif (fabric.isTouchSupported) {
        pointerX = function(event) {
          return _getPointer(event, 'pageX', 'clientX');
        };
        pointerY = function(event) {
          return _getPointer(event, 'pageY', 'clientY');
        };
      }

      fabric.util.getPointer = getPointer;

      fabric.util.object.extend(fabric.util, fabric.Observable);

    })();

    (function () {

      /**
       * Cross-browser wrapper for setting element's style
       * @memberOf fabric.util
       * @param {HTMLElement} element
       * @param {Object} styles
       * @return {HTMLElement} Element that was passed as a first argument
       */
      function setStyle(element, styles) {
        var elementStyle = element.style;
        Iif (!elementStyle) {
          return element;
        }
        Iif (typeof styles === 'string') {
          element.style.cssText += ';' + styles;
          return styles.indexOf('opacity') > -1
            ? setOpacity(element, styles.match(/opacity:\s*(\d?\.?\d*)/)[1])
            : element;
        }
        for (var property in styles) {
          Iif (property === 'opacity') {
            setOpacity(element, styles[property]);
          }
          else {
            var normalizedProperty = (property === 'float' || property === 'cssFloat')
              ? (typeof elementStyle.styleFloat === 'undefined' ? 'cssFloat' : 'styleFloat')
              : property;
            elementStyle[normalizedProperty] = styles[property];
          }
        }
        return element;
      }

      var parseEl = fabric.document.createElement('div'),
          supportsOpacity = typeof parseEl.style.opacity === 'string',
          supportsFilters = typeof parseEl.style.filter === 'string',
          reOpacity = /alpha\s*\(\s*opacity\s*=\s*([^\)]+)\)/,

          /** @ignore */
          setOpacity = function (element) { return element; };

      Eif (supportsOpacity) {
        /** @ignore */
        setOpacity = function(element, value) {
          element.style.opacity = value;
          return element;
        };
      }
      else if (supportsFilters) {
        /** @ignore */
        setOpacity = function(element, value) {
          var es = element.style;
          if (element.currentStyle && !element.currentStyle.hasLayout) {
            es.zoom = 1;
          }
          if (reOpacity.test(es.filter)) {
            value = value >= 0.9999 ? '' : ('alpha(opacity=' + (value * 100) + ')');
            es.filter = es.filter.replace(reOpacity, value);
          }
          else {
            es.filter += ' alpha(opacity=' + (value * 100) + ')';
          }
          return element;
        };
      }

      fabric.util.setStyle = setStyle;

    })();

    (function() {

      var _slice = Array.prototype.slice;

      /**
       * Takes id and returns an element with that id (if one exists in a document)
       * @memberOf fabric.util
       * @param {String|HTMLElement} id
       * @return {HTMLElement|null}
       */
      function getById(id) {
        return typeof id === 'string' ? fabric.document.getElementById(id) : id;
      }

      var sliceCanConvertNodelists,
          /**
           * Converts an array-like object (e.g. arguments or NodeList) to an array
           * @memberOf fabric.util
           * @param {Object} arrayLike
           * @return {Array}
           */
          toArray = function(arrayLike) {
            return _slice.call(arrayLike, 0);
          };

      try {
        sliceCanConvertNodelists = toArray(fabric.document.childNodes) instanceof Array;
      }
      catch (err) { }

      Iif (!sliceCanConvertNodelists) {
        toArray = function(arrayLike) {
          var arr = new Array(arrayLike.length), i = arrayLike.length;
          while (i--) {
            arr[i] = arrayLike[i];
          }
          return arr;
        };
      }

      /**
       * Creates specified element with specified attributes
       * @memberOf fabric.util
       * @param {String} tagName Type of an element to create
       * @param {Object} [attributes] Attributes to set on an element
       * @return {HTMLElement} Newly created element
       */
      function makeElement(tagName, attributes) {
        var el = fabric.document.createElement(tagName);
        for (var prop in attributes) {
          if (prop === 'class') {
            el.className = attributes[prop];
          }
          else if (prop === 'for') {
            el.htmlFor = attributes[prop];
          }
          else {
            el.setAttribute(prop, attributes[prop]);
          }
        }
        return el;
      }

      /**
       * Adds class to an element
       * @memberOf fabric.util
       * @param {HTMLElement} element Element to add class to
       * @param {String} className Class to add to an element
       */
      function addClass(element, className) {
        if (element && (' ' + element.className + ' ').indexOf(' ' + className + ' ') === -1) {
          element.className += (element.className ? ' ' : '') + className;
        }
      }

      /**
       * Wraps element with another element
       * @memberOf fabric.util
       * @param {HTMLElement} element Element to wrap
       * @param {HTMLElement|String} wrapper Element to wrap with
       * @param {Object} [attributes] Attributes to set on a wrapper
       * @return {HTMLElement} wrapper
       */
      function wrapElement(element, wrapper, attributes) {
        Eif (typeof wrapper === 'string') {
          wrapper = makeElement(wrapper, attributes);
        }
        if (element.parentNode) {
          element.parentNode.replaceChild(wrapper, element);
        }
        wrapper.appendChild(element);
        return wrapper;
      }

      /**
       * Returns element scroll offsets
       * @memberOf fabric.util
       * @param {HTMLElement} element Element to operate on
       * @return {Object} Object with left/top values
       */
      function getScrollLeftTop(element) {

        var left = 0,
            top = 0,
            docElement = fabric.document.documentElement,
            body = fabric.document.body || {
              scrollLeft: 0, scrollTop: 0
            };

        // While loop checks (and then sets element to) .parentNode OR .host
        //  to account for ShadowDOM. We still want to traverse up out of ShadowDOM,
        //  but the .parentNode of a root ShadowDOM node will always be null, instead
        //  it should be accessed through .host. See http://stackoverflow.com/a/24765528/4383938
        while (element && (element.parentNode || element.host)) {

          // Set element to element parent, or 'host' in case of ShadowDOM
          element = element.parentNode || element.host;

          if (element === fabric.document) {
            left = body.scrollLeft || docElement.scrollLeft || 0;
            top = body.scrollTop ||  docElement.scrollTop || 0;
          }
          else {
            left += element.scrollLeft || 0;
            top += element.scrollTop || 0;
          }

          if (element.nodeType === 1 &&
              fabric.util.getElementStyle(element, 'position') === 'fixed') {
            break;
          }
        }

        return { left: left, top: top };
      }

      /**
       * Returns offset for a given element
       * @function
       * @memberOf fabric.util
       * @param {HTMLElement} element Element to get offset for
       * @return {Object} Object with "left" and "top" properties
       */
      function getElementOffset(element) {
        var docElem,
            doc = element && element.ownerDocument,
            box = { left: 0, top: 0 },
            offset = { left: 0, top: 0 },
            scrollLeftTop,
            offsetAttributes = {
              borderLeftWidth: 'left',
              borderTopWidth:  'top',
              paddingLeft:     'left',
              paddingTop:      'top'
            };

        Iif (!doc) {
          return offset;
        }

        for (var attr in offsetAttributes) {
          offset[offsetAttributes[attr]] += parseInt(getElementStyle(element, attr), 10) || 0;
        }

        docElem = doc.documentElement;
        Eif ( typeof element.getBoundingClientRect !== 'undefined' ) {
          box = element.getBoundingClientRect();
        }

        scrollLeftTop = getScrollLeftTop(element);

        return {
          left: box.left + scrollLeftTop.left - (docElem.clientLeft || 0) + offset.left,
          top: box.top + scrollLeftTop.top - (docElem.clientTop || 0)  + offset.top
        };
      }

      /**
       * Returns style attribute value of a given element
       * @memberOf fabric.util
       * @param {HTMLElement} element Element to get style attribute for
       * @param {String} attr Style attribute to get for element
       * @return {String} Style attribute value of the given element.
       */
      var getElementStyle;
      Eif (fabric.document.defaultView && fabric.document.defaultView.getComputedStyle) {
        getElementStyle = function(element, attr) {
          var style = fabric.document.defaultView.getComputedStyle(element, null);
          return style ? style[attr] : undefined;
        };
      }
      else {
        getElementStyle = function(element, attr) {
          var value = element.style[attr];
          if (!value && element.currentStyle) {
            value = element.currentStyle[attr];
          }
          return value;
        };
      }

      (function () {
        var style = fabric.document.documentElement.style,
            selectProp = 'userSelect' in style
              ? 'userSelect'
              : 'MozUserSelect' in style
                ? 'MozUserSelect'
                : 'WebkitUserSelect' in style
                  ? 'WebkitUserSelect'
                  : 'KhtmlUserSelect' in style
                    ? 'KhtmlUserSelect'
                    : '';

        /**
         * Makes element unselectable
         * @memberOf fabric.util
         * @param {HTMLElement} element Element to make unselectable
         * @return {HTMLElement} Element that was passed in
         */
        function makeElementUnselectable(element) {
          Iif (typeof element.onselectstart !== 'undefined') {
            element.onselectstart = fabric.util.falseFunction;
          }
          Iif (selectProp) {
            element.style[selectProp] = 'none';
          }
          else Iif (typeof element.unselectable === 'string') {
            element.unselectable = 'on';
          }
          return element;
        }

        /**
         * Makes element selectable
         * @memberOf fabric.util
         * @param {HTMLElement} element Element to make selectable
         * @return {HTMLElement} Element that was passed in
         */
        function makeElementSelectable(element) {
          Iif (typeof element.onselectstart !== 'undefined') {
            element.onselectstart = null;
          }
          Iif (selectProp) {
            element.style[selectProp] = '';
          }
          else Iif (typeof element.unselectable === 'string') {
            element.unselectable = '';
          }
          return element;
        }

        fabric.util.makeElementUnselectable = makeElementUnselectable;
        fabric.util.makeElementSelectable = makeElementSelectable;
      })();

      (function() {

        /**
         * Inserts a script element with a given url into a document; invokes callback, when that script is finished loading
         * @memberOf fabric.util
         * @param {String} url URL of a script to load
         * @param {Function} callback Callback to execute when script is finished loading
         */
        function getScript(url, callback) {
          var headEl = fabric.document.getElementsByTagName('head')[0],
              scriptEl = fabric.document.createElement('script'),
              loading = true;

          /** @ignore */
          scriptEl.onload = /** @ignore */ scriptEl.onreadystatechange = function(e) {
            if (loading) {
              if (typeof this.readyState === 'string' &&
                  this.readyState !== 'loaded' &&
                  this.readyState !== 'complete') {
                return;
              }
              loading = false;
              callback(e || fabric.window.event);
              scriptEl = scriptEl.onload = scriptEl.onreadystatechange = null;
            }
          };
          scriptEl.src = url;
          headEl.appendChild(scriptEl);
          // causes issue in Opera
          // headEl.removeChild(scriptEl);
        }

        fabric.util.getScript = getScript;
      })();

      fabric.util.getById = getById;
      fabric.util.toArray = toArray;
      fabric.util.makeElement = makeElement;
      fabric.util.addClass = addClass;
      fabric.util.wrapElement = wrapElement;
      fabric.util.getScrollLeftTop = getScrollLeftTop;
      fabric.util.getElementOffset = getElementOffset;
      fabric.util.getElementStyle = getElementStyle;

    })();

    (function() {

      function addParamToUrl(url, param) {
        return url + (/\?/.test(url) ? '&' : '?') + param;
      }

      var makeXHR = (function() {
        var factories = [
          function() { return new ActiveXObject('Microsoft.XMLHTTP'); },
          function() { return new ActiveXObject('Msxml2.XMLHTTP'); },
          function() { return new ActiveXObject('Msxml2.XMLHTTP.3.0'); },
          function() { return new XMLHttpRequest(); }
        ];
        for (var i = factories.length; i--; ) {
          try {
            var req = factories[i]();
            if (req) {
              return factories[i];
            }
          }
          catch (err) { }
        }
      })();

      function emptyFn() { }

      /**
       * Cross-browser abstraction for sending XMLHttpRequest
       * @memberOf fabric.util
       * @param {String} url URL to send XMLHttpRequest to
       * @param {Object} [options] Options object
       * @param {String} [options.method="GET"]
       * @param {Function} options.onComplete Callback to invoke when request is completed
       * @return {XMLHttpRequest} request
       */
      function request(url, options) {

        options || (options = { });

        var method = options.method ? options.method.toUpperCase() : 'GET',
            onComplete = options.onComplete || function() { },
            xhr = makeXHR(),
            body;

        /** @ignore */
        xhr.onreadystatechange = function() {
          if (xhr.readyState === 4) {
            onComplete(xhr);
            xhr.onreadystatechange = emptyFn;
          }
        };

        if (method === 'GET') {
          body = null;
          if (typeof options.parameters === 'string') {
            url = addParamToUrl(url, options.parameters);
          }
        }

        xhr.open(method, url, true);

        if (method === 'POST' || method === 'PUT') {
          xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        }

        xhr.send(body);
        return xhr;
      }

      fabric.util.request = request;
    })();

    /**
     * Wrapper around `console.log` (when available)
     * @param {Any} [values] Values to log
     */
    fabric.log = function() { };

    /**
     * Wrapper around `console.warn` (when available)
     * @param {Any} [values] Values to log as a warning
     */
    fabric.warn = function() { };

    /* jshint ignore:start */
    Eif (typeof console !== 'undefined') {

      ['log', 'warn'].forEach(function(methodName) {

        Eif (typeof console[methodName] !== 'undefined' &&
            typeof console[methodName].apply === 'function') {

          fabric[methodName] = function() {
            return console[methodName].apply(console, arguments);
          };
        }
      });
    }
    /* jshint ignore:end */

    (function() {

      /**
       * Changes value from one to another within certain period of time, invoking callbacks as value is being changed.
       * @memberOf fabric.util
       * @param {Object} [options] Animation options
       * @param {Function} [options.onChange] Callback; invoked on every value change
       * @param {Function} [options.onComplete] Callback; invoked when value change is completed
       * @param {Number} [options.startValue=0] Starting value
       * @param {Number} [options.endValue=100] Ending value
       * @param {Number} [options.byValue=100] Value to modify the property by
       * @param {Function} [options.easing] Easing function
       * @param {Number} [options.duration=500] Duration of change (in ms)
       */
      function animate(options) {

        requestAnimFrame(function(timestamp) {
          options || (options = { });

          var start = timestamp || +new Date(),
              duration = options.duration || 500,
              finish = start + duration, time,
              onChange = options.onChange || function() { },
              abort = options.abort || function() { return false; },
              easing = options.easing || function(t, b, c, d) {return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;},
              startValue = 'startValue' in options ? options.startValue : 0,
              endValue = 'endValue' in options ? options.endValue : 100,
              byValue = options.byValue || endValue - startValue;

          options.onStart && options.onStart();

          (function tick(ticktime) {
            time = ticktime || +new Date();
            var currentTime = time > finish ? duration : (time - start);
            if (abort()) {
              options.onComplete && options.onComplete();
              return;
            }
            onChange(easing(currentTime, startValue, byValue, duration));
            if (time > finish) {
              options.onComplete && options.onComplete();
              return;
            }
            requestAnimFrame(tick);
          })(start);
        });

      }

      var _requestAnimFrame = fabric.window.requestAnimationFrame       ||
                              fabric.window.webkitRequestAnimationFrame ||
                              fabric.window.mozRequestAnimationFrame    ||
                              fabric.window.oRequestAnimationFrame      ||
                              fabric.window.msRequestAnimationFrame     ||
                              function(callback) {
                                fabric.window.setTimeout(callback, 1000 / 60);
                              };

      /**
       * requestAnimationFrame polyfill based on http://paulirish.com/2011/requestanimationframe-for-smart-animating/
       * In order to get a precise start time, `requestAnimFrame` should be called as an entry into the method
       * @memberOf fabric.util
       * @param {Function} callback Callback to invoke
       * @param {DOMElement} element optional Element to associate with animation
       */
      function requestAnimFrame() {
        return _requestAnimFrame.apply(fabric.window, arguments);
      }

      fabric.util.animate = animate;
      fabric.util.requestAnimFrame = requestAnimFrame;

    })();

    (function() {

      function normalize(a, c, p, s) {
        if (a < Math.abs(c)) {
          a = c;
          s = p / 4;
        }
        else {
          //handle the 0/0 case:
          if (c === 0 && a === 0) {
            s = p / (2 * Math.PI) * Math.asin(1);
          }
          else {
            s = p / (2 * Math.PI) * Math.asin(c / a);
          }
        }
        return { a: a, c: c, p: p, s: s };
      }

      function elastic(opts, t, d) {
        return opts.a *
          Math.pow(2, 10 * (t -= 1)) *
          Math.sin( (t * d - opts.s) * (2 * Math.PI) / opts.p );
      }

      /**
       * Cubic easing out
       * @memberOf fabric.util.ease
       */
      function easeOutCubic(t, b, c, d) {
        return c * ((t = t / d - 1) * t * t + 1) + b;
      }

      /**
       * Cubic easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutCubic(t, b, c, d) {
        t /= d/2;
        if (t < 1) {
          return c / 2 * t * t * t + b;
        }
        return c / 2 * ((t -= 2) * t * t + 2) + b;
      }

      /**
       * Quartic easing in
       * @memberOf fabric.util.ease
       */
      function easeInQuart(t, b, c, d) {
        return c * (t /= d) * t * t * t + b;
      }

      /**
       * Quartic easing out
       * @memberOf fabric.util.ease
       */
      function easeOutQuart(t, b, c, d) {
        return -c * ((t = t / d - 1) * t * t * t - 1) + b;
      }

      /**
       * Quartic easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutQuart(t, b, c, d) {
        t /= d / 2;
        if (t < 1) {
          return c / 2 * t * t * t * t + b;
        }
        return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
      }

      /**
       * Quintic easing in
       * @memberOf fabric.util.ease
       */
      function easeInQuint(t, b, c, d) {
        return c * (t /= d) * t * t * t * t + b;
      }

      /**
       * Quintic easing out
       * @memberOf fabric.util.ease
       */
      function easeOutQuint(t, b, c, d) {
        return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
      }

      /**
       * Quintic easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutQuint(t, b, c, d) {
        t /= d / 2;
        if (t < 1) {
          return c / 2 * t * t * t * t * t + b;
        }
        return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
      }

      /**
       * Sinusoidal easing in
       * @memberOf fabric.util.ease
       */
      function easeInSine(t, b, c, d) {
        return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
      }

      /**
       * Sinusoidal easing out
       * @memberOf fabric.util.ease
       */
      function easeOutSine(t, b, c, d) {
        return c * Math.sin(t / d * (Math.PI / 2)) + b;
      }

      /**
       * Sinusoidal easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutSine(t, b, c, d) {
        return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
      }

      /**
       * Exponential easing in
       * @memberOf fabric.util.ease
       */
      function easeInExpo(t, b, c, d) {
        return (t === 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
      }

      /**
       * Exponential easing out
       * @memberOf fabric.util.ease
       */
      function easeOutExpo(t, b, c, d) {
        return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
      }

      /**
       * Exponential easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutExpo(t, b, c, d) {
        if (t === 0) {
          return b;
        }
        if (t === d) {
          return b + c;
        }
        t /= d / 2;
        if (t < 1) {
          return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
        }
        return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
      }

      /**
       * Circular easing in
       * @memberOf fabric.util.ease
       */
      function easeInCirc(t, b, c, d) {
        return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
      }

      /**
       * Circular easing out
       * @memberOf fabric.util.ease
       */
      function easeOutCirc(t, b, c, d) {
        return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
      }

      /**
       * Circular easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutCirc(t, b, c, d) {
        t /= d / 2;
        if (t < 1) {
          return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
        }
        return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
      }

      /**
       * Elastic easing in
       * @memberOf fabric.util.ease
       */
      function easeInElastic(t, b, c, d) {
        var s = 1.70158, p = 0, a = c;
        if (t === 0) {
          return b;
        }
        t /= d;
        if (t === 1) {
          return b + c;
        }
        if (!p) {
          p = d * 0.3;
        }
        var opts = normalize(a, c, p, s);
        return -elastic(opts, t, d) + b;
      }

      /**
       * Elastic easing out
       * @memberOf fabric.util.ease
       */
      function easeOutElastic(t, b, c, d) {
        var s = 1.70158, p = 0, a = c;
        if (t === 0) {
          return b;
        }
        t /= d;
        if (t === 1) {
          return b + c;
        }
        if (!p) {
          p = d * 0.3;
        }
        var opts = normalize(a, c, p, s);
        return opts.a * Math.pow(2, -10 * t) * Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p ) + opts.c + b;
      }

      /**
       * Elastic easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutElastic(t, b, c, d) {
        var s = 1.70158, p = 0, a = c;
        if (t === 0) {
          return b;
        }
        t /= d / 2;
        if (t === 2) {
          return b + c;
        }
        if (!p) {
          p = d * (0.3 * 1.5);
        }
        var opts = normalize(a, c, p, s);
        if (t < 1) {
          return -0.5 * elastic(opts, t, d) + b;
        }
        return opts.a * Math.pow(2, -10 * (t -= 1)) *
          Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p ) * 0.5 + opts.c + b;
      }

      /**
       * Backwards easing in
       * @memberOf fabric.util.ease
       */
      function easeInBack(t, b, c, d, s) {
        if (s === undefined) {
          s = 1.70158;
        }
        return c * (t /= d) * t * ((s + 1) * t - s) + b;
      }

      /**
       * Backwards easing out
       * @memberOf fabric.util.ease
       */
      function easeOutBack(t, b, c, d, s) {
        if (s === undefined) {
          s = 1.70158;
        }
        return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
      }

      /**
       * Backwards easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutBack(t, b, c, d, s) {
        if (s === undefined) {
          s = 1.70158;
        }
        t /= d / 2;
        if (t < 1) {
          return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
        }
        return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
      }

      /**
       * Bouncing easing in
       * @memberOf fabric.util.ease
       */
      function easeInBounce(t, b, c, d) {
        return c - easeOutBounce (d - t, 0, c, d) + b;
      }

      /**
       * Bouncing easing out
       * @memberOf fabric.util.ease
       */
      function easeOutBounce(t, b, c, d) {
        if ((t /= d) < (1 / 2.75)) {
          return c * (7.5625 * t * t) + b;
        }
        else if (t < (2/2.75)) {
          return c * (7.5625 * (t -= (1.5 / 2.75)) * t + 0.75) + b;
        }
        else if (t < (2.5/2.75)) {
          return c * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375) + b;
        }
        else {
          return c * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375) + b;
        }
      }

      /**
       * Bouncing easing in and out
       * @memberOf fabric.util.ease
       */
      function easeInOutBounce(t, b, c, d) {
        if (t < d / 2) {
          return easeInBounce (t * 2, 0, c, d) * 0.5 + b;
        }
        return easeOutBounce(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;
      }

      /**
       * Easing functions
       * See <a href="http://gizma.com/easing/">Easing Equations by Robert Penner</a>
       * @namespace fabric.util.ease
       */
      fabric.util.ease = {

        /**
         * Quadratic easing in
         * @memberOf fabric.util.ease
         */
        easeInQuad: function(t, b, c, d) {
          return c * (t /= d) * t + b;
        },

        /**
         * Quadratic easing out
         * @memberOf fabric.util.ease
         */
        easeOutQuad: function(t, b, c, d) {
          return -c * (t /= d) * (t - 2) + b;
        },

        /**
         * Quadratic easing in and out
         * @memberOf fabric.util.ease
         */
        easeInOutQuad: function(t, b, c, d) {
          t /= (d / 2);
          if (t < 1) {
            return c / 2 * t * t + b;
          }
          return -c / 2 * ((--t) * (t - 2) - 1) + b;
        },

        /**
         * Cubic easing in
         * @memberOf fabric.util.ease
         */
        easeInCubic: function(t, b, c, d) {
          return c * (t /= d) * t * t + b;
        },

        easeOutCubic: easeOutCubic,
        easeInOutCubic: easeInOutCubic,
        easeInQuart: easeInQuart,
        easeOutQuart: easeOutQuart,
        easeInOutQuart: easeInOutQuart,
        easeInQuint: easeInQuint,
        easeOutQuint: easeOutQuint,
        easeInOutQuint: easeInOutQuint,
        easeInSine: easeInSine,
        easeOutSine: easeOutSine,
        easeInOutSine: easeInOutSine,
        easeInExpo: easeInExpo,
        easeOutExpo: easeOutExpo,
        easeInOutExpo: easeInOutExpo,
        easeInCirc: easeInCirc,
        easeOutCirc: easeOutCirc,
        easeInOutCirc: easeInOutCirc,
        easeInElastic: easeInElastic,
        easeOutElastic: easeOutElastic,
        easeInOutElastic: easeInOutElastic,
        easeInBack: easeInBack,
        easeOutBack: easeOutBack,
        easeInOutBack: easeInOutBack,
        easeInBounce: easeInBounce,
        easeOutBounce: easeOutBounce,
        easeInOutBounce: easeInOutBounce
      };

    }());

    (function(global) {

      'use strict';

      /**
       * @name fabric
       * @namespace
       */

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          capitalize = fabric.util.string.capitalize,
          clone = fabric.util.object.clone,
          toFixed = fabric.util.toFixed,
          parseUnit = fabric.util.parseUnit,
          multiplyTransformMatrices = fabric.util.multiplyTransformMatrices,

          reAllowedSVGTagNames = /^(path|circle|polygon|polyline|ellipse|rect|line|image|text)$/i,
          reViewBoxTagNames = /^(symbol|image|marker|pattern|view|svg)$/i,
          reNotAllowedAncestors = /^(?:pattern|defs|symbol|metadata)$/i,
          reAllowedParents = /^(symbol|g|a|svg)$/i,

          attributesMap = {
            cx:                   'left',
            x:                    'left',
            r:                    'radius',
            cy:                   'top',
            y:                    'top',
            display:              'visible',
            visibility:           'visible',
            transform:            'transformMatrix',
            'fill-opacity':       'fillOpacity',
            'fill-rule':          'fillRule',
            'font-family':        'fontFamily',
            'font-size':          'fontSize',
            'font-style':         'fontStyle',
            'font-weight':        'fontWeight',
            'stroke-dasharray':   'strokeDashArray',
            'stroke-linecap':     'strokeLineCap',
            'stroke-linejoin':    'strokeLineJoin',
            'stroke-miterlimit':  'strokeMiterLimit',
            'stroke-opacity':     'strokeOpacity',
            'stroke-width':       'strokeWidth',
            'text-decoration':    'textDecoration',
            'text-anchor':        'originX'
          },

          colorAttributes = {
            stroke: 'strokeOpacity',
            fill:   'fillOpacity'
          };

      fabric.cssRules = { };
      fabric.gradientDefs = { };

      function normalizeAttr(attr) {
        // transform attribute names
        if (attr in attributesMap) {
          return attributesMap[attr];
        }
        return attr;
      }

      function normalizeValue(attr, value, parentAttributes, fontSize) {
        var isArray = Object.prototype.toString.call(value) === '[object Array]',
            parsed;

        if ((attr === 'fill' || attr === 'stroke') && value === 'none') {
          value = '';
        }
        else if (attr === 'strokeDashArray') {
          value = value.replace(/,/g, ' ').split(/\s+/).map(function(n) {
            return parseFloat(n);
          });
        }
        else if (attr === 'transformMatrix') {
          if (parentAttributes && parentAttributes.transformMatrix) {
            value = multiplyTransformMatrices(
              parentAttributes.transformMatrix, fabric.parseTransformAttribute(value));
          }
          else {
            value = fabric.parseTransformAttribute(value);
          }
        }
        else Iif (attr === 'visible') {
          value = (value === 'none' || value === 'hidden') ? false : true;
          // display=none on parent element always takes precedence over child element
          if (parentAttributes && parentAttributes.visible === false) {
            value = false;
          }
        }
        else if (attr === 'originX' /* text-anchor */) {
          value = value === 'start' ? 'left' : value === 'end' ? 'right' : 'center';
        }
        else {
          parsed = isArray ? value.map(parseUnit) : parseUnit(value, fontSize);
        }

        return (!isArray && isNaN(parsed) ? value : parsed);
      }

      /**
       * @private
       * @param {Object} attributes Array of attributes to parse
       */
      function _setStrokeFillOpacity(attributes) {
        for (var attr in colorAttributes) {

          if (typeof attributes[colorAttributes[attr]] === 'undefined' || attributes[attr] === '') {
            continue;
          }

          if (typeof attributes[attr] === 'undefined') {
            if (!fabric.Object.prototype[attr]) {
              continue;
            }
            attributes[attr] = fabric.Object.prototype[attr];
          }

          Iif (attributes[attr].indexOf('url(') === 0) {
            continue;
          }

          var color = new fabric.Color(attributes[attr]);
          attributes[attr] = color.setAlpha(toFixed(color.getAlpha() * attributes[colorAttributes[attr]], 2)).toRgba();
        }
        return attributes;
      }

      /**
       * Parses "transform" attribute, returning an array of values
       * @static
       * @function
       * @memberOf fabric
       * @param {String} attributeValue String containing attribute value
       * @return {Array} Array of 6 elements representing transformation matrix
       */
      fabric.parseTransformAttribute = (function() {
        function rotateMatrix(matrix, args) {
          var angle = args[0],
              x = (args.length === 3) ? args[1] : 0,
              y = (args.length === 3) ? args[2] : 0;

          matrix[0] = Math.cos(angle);
          matrix[1] = Math.sin(angle);
          matrix[2] = -Math.sin(angle);
          matrix[3] = Math.cos(angle);
          matrix[4] = x - (matrix[0] * x + matrix[2] * y);
          matrix[5] = y - (matrix[1] * x + matrix[3] * y);
        }

        function scaleMatrix(matrix, args) {
          var multiplierX = args[0],
              multiplierY = (args.length === 2) ? args[1] : args[0];

          matrix[0] = multiplierX;
          matrix[3] = multiplierY;
        }

        function skewXMatrix(matrix, args) {
          matrix[2] = Math.tan(fabric.util.degreesToRadians(args[0]));
        }

        function skewYMatrix(matrix, args) {
          matrix[1] = Math.tan(fabric.util.degreesToRadians(args[0]));
        }

        function translateMatrix(matrix, args) {
          matrix[4] = args[0];
          if (args.length === 2) {
            matrix[5] = args[1];
          }
        }

        // identity matrix
        var iMatrix = [
              1, // a
              0, // b
              0, // c
              1, // d
              0, // e
              0  // f
            ],

            // == begin transform regexp
            number = fabric.reNum,

            commaWsp = '(?:\\s+,?\\s*|,\\s*)',

            skewX = '(?:(skewX)\\s*\\(\\s*(' + number + ')\\s*\\))',

            skewY = '(?:(skewY)\\s*\\(\\s*(' + number + ')\\s*\\))',

            rotate = '(?:(rotate)\\s*\\(\\s*(' + number + ')(?:' +
                        commaWsp + '(' + number + ')' +
                        commaWsp + '(' + number + '))?\\s*\\))',

            scale = '(?:(scale)\\s*\\(\\s*(' + number + ')(?:' +
                        commaWsp + '(' + number + '))?\\s*\\))',

            translate = '(?:(translate)\\s*\\(\\s*(' + number + ')(?:' +
                        commaWsp + '(' + number + '))?\\s*\\))',

            matrix = '(?:(matrix)\\s*\\(\\s*' +
                      '(' + number + ')' + commaWsp +
                      '(' + number + ')' + commaWsp +
                      '(' + number + ')' + commaWsp +
                      '(' + number + ')' + commaWsp +
                      '(' + number + ')' + commaWsp +
                      '(' + number + ')' +
                      '\\s*\\))',

            transform = '(?:' +
                        matrix + '|' +
                        translate + '|' +
                        scale + '|' +
                        rotate + '|' +
                        skewX + '|' +
                        skewY +
                        ')',

            transforms = '(?:' + transform + '(?:' + commaWsp + '*' + transform + ')*' + ')',

            transformList = '^\\s*(?:' + transforms + '?)\\s*$',

            // http://www.w3.org/TR/SVG/coords.html#TransformAttribute
            reTransformList = new RegExp(transformList),
            // == end transform regexp

            reTransform = new RegExp(transform, 'g');

        return function(attributeValue) {

          // start with identity matrix
          var matrix = iMatrix.concat(),
              matrices = [ ];

          // return if no argument was given or
          // an argument does not match transform attribute regexp
          Iif (!attributeValue || (attributeValue && !reTransformList.test(attributeValue))) {
            return matrix;
          }

          attributeValue.replace(reTransform, function(match) {

            var m = new RegExp(transform).exec(match).filter(function (match) {
                  return (match !== '' && match != null);
                }),
                operation = m[1],
                args = m.slice(2).map(parseFloat);

            switch (operation) {
              case 'translate':
                translateMatrix(matrix, args);
                break;
              case 'rotate':
                args[0] = fabric.util.degreesToRadians(args[0]);
                rotateMatrix(matrix, args);
                break;
              case 'scale':
                scaleMatrix(matrix, args);
                break;
              case 'skewX':
                skewXMatrix(matrix, args);
                break;
              case 'skewY':
                skewYMatrix(matrix, args);
                break;
              case 'matrix':
                matrix = args;
                break;
            }

            // snapshot current matrix into matrices array
            matrices.push(matrix.concat());
            // reset
            matrix = iMatrix.concat();
          });

          var combinedMatrix = matrices[0];
          while (matrices.length > 1) {
            matrices.shift();
            combinedMatrix = fabric.util.multiplyTransformMatrices(combinedMatrix, matrices[0]);
          }
          return combinedMatrix;
        };
      })();

      /**
       * @private
       */
      function parseStyleString(style, oStyle) {
        var attr, value;
        style.replace(/;\s*$/, '').split(';').forEach(function (chunk) {
          var pair = chunk.split(':');

          attr = normalizeAttr(pair[0].trim().toLowerCase());
          value = normalizeValue(attr, pair[1].trim());

          oStyle[attr] = value;
        });
      }

      /**
       * @private
       */
      function parseStyleObject(style, oStyle) {
        var attr, value;
        for (var prop in style) {
          if (typeof style[prop] === 'undefined') {
            continue;
          }

          attr = normalizeAttr(prop.toLowerCase());
          value = normalizeValue(attr, style[prop]);

          oStyle[attr] = value;
        }
      }

      /**
       * @private
       */
      function getGlobalStylesForElement(element, svgUid) {
        var styles = { };
        for (var rule in fabric.cssRules[svgUid]) {
          if (elementMatchesRule(element, rule.split(' '))) {
            for (var property in fabric.cssRules[svgUid][rule]) {
              styles[property] = fabric.cssRules[svgUid][rule][property];
            }
          }
        }
        return styles;
      }

      /**
       * @private
       */
      function elementMatchesRule(element, selectors) {
        var firstMatching, parentMatching = true;
        //start from rightmost selector.
        firstMatching = selectorMatches(element, selectors.pop());
        if (firstMatching && selectors.length) {
          parentMatching = doesSomeParentMatch(element, selectors);
        }
        return firstMatching && parentMatching && (selectors.length === 0);
      }

      function doesSomeParentMatch(element, selectors) {
        var selector, parentMatching = true;
        while (element.parentNode && element.parentNode.nodeType === 1 && selectors.length) {
          if (parentMatching) {
            selector = selectors.pop();
          }
          element = element.parentNode;
          parentMatching = selectorMatches(element, selector);
        }
        return selectors.length === 0;
      }

      /**
       * @private
       */
      function selectorMatches(element, selector) {
        var nodeName = element.nodeName,
            classNames = element.getAttribute('class'),
            id = element.getAttribute('id'), matcher;
        // i check if a selector matches slicing away part from it.
        // if i get empty string i should match
        matcher = new RegExp('^' + nodeName, 'i');
        selector = selector.replace(matcher, '');
        Iif (id && selector.length) {
          matcher = new RegExp('#' + id + '(?![a-zA-Z\\-]+)', 'i');
          selector = selector.replace(matcher, '');
        }
        Eif (classNames && selector.length) {
          classNames = classNames.split(' ');
          for (var i = classNames.length; i--;) {
            matcher = new RegExp('\\.' + classNames[i] + '(?![a-zA-Z\\-]+)', 'i');
            selector = selector.replace(matcher, '');
          }
        }
        return selector.length === 0;
      }

      /**
       * @private
       * to support IE8 missing getElementById on SVGdocument
       */
      function elementById(doc, id) {
        var el;
        doc.getElementById && (el = doc.getElementById(id));
        Iif (el) {
          return el;
        }
        var node, i, nodelist = doc.getElementsByTagName('*');
        for (i = 0; i < nodelist.length; i++) {
          node = nodelist[i];
          if (id === node.getAttribute('id')) {
            return node;
          }
        }
      }

      /**
       * @private
       */
      function parseUseDirectives(doc) {
        var nodelist = doc.getElementsByTagName('use'), i = 0;
        while (nodelist.length && i < nodelist.length) {
          var el = nodelist[i],
              xlink = el.getAttribute('xlink:href').substr(1),
              x = el.getAttribute('x') || 0,
              y = el.getAttribute('y') || 0,
              el2 = elementById(doc, xlink).cloneNode(true),
              currentTrans = (el2.getAttribute('transform') || '') + ' translate(' + x + ', ' + y + ')',
              parentNode, oldLength = nodelist.length, attr, j, attrs, l;

          applyViewboxTransform(el2);
          Iif (/^svg$/i.test(el2.nodeName)) {
            var el3 = el2.ownerDocument.createElement('g');
            for (j = 0, attrs = el2.attributes, l = attrs.length; j < l; j++) {
              attr = attrs.item(j);
              el3.setAttribute(attr.nodeName, attr.nodeValue);
            }
            while (el2.firstChild != null) {
              el3.appendChild(el2.firstChild);
            }
            el2 = el3;
          }

          for (j = 0, attrs = el.attributes, l = attrs.length; j < l; j++) {
            attr = attrs.item(j);
            Eif (attr.nodeName === 'x' || attr.nodeName === 'y' || attr.nodeName === 'xlink:href') {
              continue;
            }

            if (attr.nodeName === 'transform') {
              currentTrans = attr.nodeValue + ' ' + currentTrans;
            }
            else {
              el2.setAttribute(attr.nodeName, attr.nodeValue);
            }
          }

          el2.setAttribute('transform', currentTrans);
          el2.setAttribute('instantiated_by_use', '1');
          el2.removeAttribute('id');
          parentNode = el.parentNode;
          parentNode.replaceChild(el2, el);
          // some browsers do not shorten nodelist after replaceChild (IE8)
          Iif (nodelist.length === oldLength) {
            i++;
          }
        }
      }

      // http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute
      // matches, e.g.: +14.56e-12, etc.
      var reViewBoxAttrValue = new RegExp(
        '^' +
        '\\s*(' + fabric.reNum + '+)\\s*,?' +
        '\\s*(' + fabric.reNum + '+)\\s*,?' +
        '\\s*(' + fabric.reNum + '+)\\s*,?' +
        '\\s*(' + fabric.reNum + '+)\\s*' +
        '$'
      );

      /**
       * Add a <g> element that envelop all child elements and makes the viewbox transformMatrix descend on all elements
       */
      function applyViewboxTransform(element) {

        var viewBoxAttr = element.getAttribute('viewBox'),
            scaleX = 1,
            scaleY = 1,
            minX = 0,
            minY = 0,
            viewBoxWidth, viewBoxHeight, matrix, el,
            widthAttr = element.getAttribute('width'),
            heightAttr = element.getAttribute('height'),
            x = element.getAttribute('x') || 0,
            y = element.getAttribute('y') || 0,
            preserveAspectRatio = element.getAttribute('preserveAspectRatio') || '',
            missingViewBox = (!viewBoxAttr || !reViewBoxTagNames.test(element.tagName)
                               || !(viewBoxAttr = viewBoxAttr.match(reViewBoxAttrValue))),
            missingDimAttr = (!widthAttr || !heightAttr || widthAttr === '100%' || heightAttr === '100%'),
            toBeParsed = missingViewBox && missingDimAttr,
            parsedDim = { }, translateMatrix = '';

        parsedDim.width = 0;
        parsedDim.height = 0;
        parsedDim.toBeParsed = toBeParsed;

        if (toBeParsed) {
          return parsedDim;
        }

        Eif (missingViewBox) {
          parsedDim.width = parseUnit(widthAttr);
          parsedDim.height = parseUnit(heightAttr);
          return parsedDim;
        }

        minX = -parseFloat(viewBoxAttr[1]),
        minY = -parseFloat(viewBoxAttr[2]),
        viewBoxWidth = parseFloat(viewBoxAttr[3]),
        viewBoxHeight = parseFloat(viewBoxAttr[4]);

        if (!missingDimAttr) {
          parsedDim.width = parseUnit(widthAttr);
          parsedDim.height = parseUnit(heightAttr);
          scaleX = parsedDim.width / viewBoxWidth;
          scaleY = parsedDim.height / viewBoxHeight;
        }
        else {
          parsedDim.width = viewBoxWidth;
          parsedDim.height = viewBoxHeight;
        }

        // default is to preserve aspect ratio
        preserveAspectRatio = fabric.util.parsePreserveAspectRatioAttribute(preserveAspectRatio);
        if (preserveAspectRatio.alignX !== 'none') {
          //translate all container for the effect of Mid, Min, Max
          scaleY = scaleX = (scaleX > scaleY ? scaleY : scaleX);
        }

        if (scaleX === 1 && scaleY === 1 && minX === 0 && minY === 0 && x === 0 && y === 0) {
          return parsedDim;
        }

        if (x || y) {
          translateMatrix = ' translate(' + parseUnit(x) + ' ' + parseUnit(y) + ') ';
        }

        matrix = translateMatrix + ' matrix(' + scaleX +
                      ' 0' +
                      ' 0 ' +
                      scaleY + ' ' +
                      (minX * scaleX) + ' ' +
                      (minY * scaleY) + ') ';

        if (element.tagName === 'svg') {
          el = element.ownerDocument.createElement('g');
          while (element.firstChild != null) {
            el.appendChild(element.firstChild);
          }
          element.appendChild(el);
        }
        else {
          el = element;
          matrix = el.getAttribute('transform') + matrix;
        }

        el.setAttribute('transform', matrix);
        return parsedDim;
      }

      /**
       * Parses an SVG document, converts it to an array of corresponding fabric.* instances and passes them to a callback
       * @static
       * @function
       * @memberOf fabric
       * @param {SVGDocument} doc SVG document to parse
       * @param {Function} callback Callback to call when parsing is finished; It's being passed an array of elements (parsed from a document).
       * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
       */
      fabric.parseSVGDocument = (function() {

        function hasAncestorWithNodeName(element, nodeName) {
          while (element && (element = element.parentNode)) {
            if (nodeName.test(element.nodeName) && !element.getAttribute('instantiated_by_use')) {
              return true;
            }
          }
          return false;
        }

        return function(doc, callback, reviver) {
          Iif (!doc) {
            return;
          }

          parseUseDirectives(doc);

          var startTime = new Date(),
              svgUid =  fabric.Object.__uid++,
              options = applyViewboxTransform(doc),
              descendants = fabric.util.toArray(doc.getElementsByTagName('*'));

          options.svgUid = svgUid;

          Iif (descendants.length === 0 && fabric.isLikelyNode) {
            // we're likely in node, where "o3-xml" library fails to gEBTN("*")
            // https://github.com/ajaxorg/node-o3-xml/issues/21
            descendants = doc.selectNodes('//*[name(.)!="svg"]');
            var arr = [ ];
            for (var i = 0, len = descendants.length; i < len; i++) {
              arr[i] = descendants[i];
            }
            descendants = arr;
          }

          var elements = descendants.filter(function(el) {
            applyViewboxTransform(el);
            return reAllowedSVGTagNames.test(el.tagName) &&
                  !hasAncestorWithNodeName(el, reNotAllowedAncestors); // http://www.w3.org/TR/SVG/struct.html#DefsElement
          });

          Iif (!elements || (elements && !elements.length)) {
            callback && callback([], {});
            return;
          }

          fabric.gradientDefs[svgUid] = fabric.getGradientDefs(doc);
          fabric.cssRules[svgUid] = fabric.getCSSRules(doc);
          // Precedence of rules:   style > class > attribute
          fabric.parseElements(elements, function(instances) {
            fabric.documentParsingTime = new Date() - startTime;
            Eif (callback) {
              callback(instances, options);
            }
          }, clone(options), reviver);
        };
      })();

      /**
       * Used for caching SVG documents (loaded via `fabric.Canvas#loadSVGFromURL`)
       * @namespace
       */
      var svgCache = {

        /**
         * @param {String} name
         * @param {Function} callback
         */
        has: function (name, callback) {
          callback(false);
        },

        get: function () {
          /* NOOP */
        },

        set: function () {
          /* NOOP */
        }
      };

      /**
       * @private
       */
      function _enlivenCachedObject(cachedObject) {

        var objects = cachedObject.objects,
            options = cachedObject.options;

        objects = objects.map(function (o) {
          return fabric[capitalize(o.type)].fromObject(o);
        });

        return ({ objects: objects, options: options });
      }

      /**
       * @private
       */
      function _createSVGPattern(markup, canvas, property) {
        Iif (canvas[property] && canvas[property].toSVG) {
          markup.push(
            '\t<pattern x="0" y="0" id="', property, 'Pattern" ',
              'width="', canvas[property].source.width,
              '" height="', canvas[property].source.height,
              '" patternUnits="userSpaceOnUse">\n',
            '\t\t<image x="0" y="0" ',
            'width="', canvas[property].source.width,
            '" height="', canvas[property].source.height,
            '" xlink:href="', canvas[property].source.src,
            '"></image>\n\t</pattern>\n'
          );
        }
      }

      var reFontDeclaration = new RegExp(
        '(normal|italic)?\\s*(normal|small-caps)?\\s*' +
        '(normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900)?\\s*(' +
          fabric.reNum +
        '(?:px|cm|mm|em|pt|pc|in)*)(?:\\/(normal|' + fabric.reNum + '))?\\s+(.*)');

      extend(fabric, {
        /**
         * Parses a short font declaration, building adding its properties to a style object
         * @static
         * @function
         * @memberOf fabric
         * @param {String} value font declaration
         * @param {Object} oStyle definition
         */
        parseFontDeclaration: function(value, oStyle) {
          var match = value.match(reFontDeclaration);

          Iif (!match) {
            return;
          }
          var fontStyle = match[1],
              // font variant is not used
              // fontVariant = match[2],
              fontWeight = match[3],
              fontSize = match[4],
              lineHeight = match[5],
              fontFamily = match[6];

          Eif (fontStyle) {
            oStyle.fontStyle = fontStyle;
          }
          Iif (fontWeight) {
            oStyle.fontWeight = isNaN(parseFloat(fontWeight)) ? fontWeight : parseFloat(fontWeight);
          }
          Eif (fontSize) {
            oStyle.fontSize = parseUnit(fontSize);
          }
          Eif (fontFamily) {
            oStyle.fontFamily = fontFamily;
          }
          Iif (lineHeight) {
            oStyle.lineHeight = lineHeight === 'normal' ? 1 : lineHeight;
          }
        },

        /**
         * Parses an SVG document, returning all of the gradient declarations found in it
         * @static
         * @function
         * @memberOf fabric
         * @param {SVGDocument} doc SVG document to parse
         * @return {Object} Gradient definitions; key corresponds to element id, value -- to gradient definition element
         */
        getGradientDefs: function(doc) {
          var linearGradientEls = doc.getElementsByTagName('linearGradient'),
              radialGradientEls = doc.getElementsByTagName('radialGradient'),
              el, i, j = 0, id, xlink, elList = [ ],
              gradientDefs = { }, idsToXlinkMap = { };

          elList.length = linearGradientEls.length + radialGradientEls.length;
          i = linearGradientEls.length;
          while (i--) {
            elList[j++] = linearGradientEls[i];
          }
          i = radialGradientEls.length;
          while (i--) {
            elList[j++] = radialGradientEls[i];
          }

          while (j--) {
            el = elList[j];
            xlink = el.getAttribute('xlink:href');
            id = el.getAttribute('id');
            if (xlink) {
              idsToXlinkMap[id] = xlink.substr(1);
            }
            gradientDefs[id] = el;
          }

          for (id in idsToXlinkMap) {
            var el2 = gradientDefs[idsToXlinkMap[id]].cloneNode(true);
            el = gradientDefs[id];
            while (el2.firstChild) {
              el.appendChild(el2.firstChild);
            }
          }
          return gradientDefs;
        },

        /**
         * Returns an object of attributes' name/value, given element and an array of attribute names;
         * Parses parent "g" nodes recursively upwards.
         * @static
         * @memberOf fabric
         * @param {DOMElement} element Element to parse
         * @param {Array} attributes Array of attributes to parse
         * @return {Object} object containing parsed attributes' names/values
         */
        parseAttributes: function(element, attributes, svgUid) {

          Iif (!element) {
            return;
          }

          var value,
              parentAttributes = { },
              fontSize;

          if (typeof svgUid === 'undefined') {
            svgUid = element.getAttribute('svgUid');
          }
          // if there's a parent container (`g` or `a` or `symbol` node), parse its attributes recursively upwards
          if (element.parentNode && reAllowedParents.test(element.parentNode.nodeName)) {
            parentAttributes = fabric.parseAttributes(element.parentNode, attributes, svgUid);
          }
          fontSize = (parentAttributes && parentAttributes.fontSize ) ||
                     element.getAttribute('font-size') || fabric.Text.DEFAULT_SVG_FONT_SIZE;

          var ownAttributes = attributes.reduce(function(memo, attr) {
            value = element.getAttribute(attr);
            if (value) {
              attr = normalizeAttr(attr);
              value = normalizeValue(attr, value, parentAttributes, fontSize);

              memo[attr] = value;
            }
            return memo;
          }, { });

          // add values parsed from style, which take precedence over attributes
          // (see: http://www.w3.org/TR/SVG/styling.html#UsingPresentationAttributes)
          ownAttributes = extend(ownAttributes,
            extend(getGlobalStylesForElement(element, svgUid), fabric.parseStyleAttribute(element)));
          Iif (ownAttributes.font) {
            fabric.parseFontDeclaration(ownAttributes.font, ownAttributes);
          }
          return _setStrokeFillOpacity(extend(parentAttributes, ownAttributes));
        },

        /**
         * Transforms an array of svg elements to corresponding fabric.* instances
         * @static
         * @memberOf fabric
         * @param {Array} elements Array of elements to parse
         * @param {Function} callback Being passed an array of fabric instances (transformed from SVG elements)
         * @param {Object} [options] Options object
         * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
         */
        parseElements: function(elements, callback, options, reviver) {
          new fabric.ElementsParser(elements, callback, options, reviver).parse();
        },

        /**
         * Parses "style" attribute, retuning an object with values
         * @static
         * @memberOf fabric
         * @param {SVGElement} element Element to parse
         * @return {Object} Objects with values parsed from style attribute of an element
         */
        parseStyleAttribute: function(element) {
          var oStyle = { },
              style = element.getAttribute('style');

          if (!style) {
            return oStyle;
          }

          Eif (typeof style === 'string') {
            parseStyleString(style, oStyle);
          }
          else {
            parseStyleObject(style, oStyle);
          }

          return oStyle;
        },

        /**
         * Parses "points" attribute, returning an array of values
         * @static
         * @memberOf fabric
         * @param {String} points points attribute string
         * @return {Array} array of points
         */
        parsePointsAttribute: function(points) {

          // points attribute is required and must not be empty
          if (!points) {
            return null;
          }

          // replace commas with whitespace and remove bookending whitespace
          points = points.replace(/,/g, ' ').trim();

          points = points.split(/\s+/);
          var parsedPoints = [ ], i, len;

          i = 0;
          len = points.length;
          for (; i < len; i+=2) {
            parsedPoints.push({
              x: parseFloat(points[i]),
              y: parseFloat(points[i + 1])
            });
          }

          // odd number of points is an error
          // if (parsedPoints.length % 2 !== 0) {
          //   return null;
          // }

          return parsedPoints;
        },

        /**
         * Returns CSS rules for a given SVG document
         * @static
         * @function
         * @memberOf fabric
         * @param {SVGDocument} doc SVG document to parse
         * @return {Object} CSS rules of this document
         */
        getCSSRules: function(doc) {
          var styles = doc.getElementsByTagName('style'),
              allRules = { }, rules;

          // very crude parsing of style contents
          for (var i = 0, len = styles.length; i < len; i++) {
            // IE9 doesn't support textContent, but provides text instead.
            var styleContents = styles[i].textContent || styles[i].text;

            // remove comments
            styleContents = styleContents.replace(/\/\*[\s\S]*?\*\//g, '');
            if (styleContents.trim() === '') {
              continue;
            }
            rules = styleContents.match(/[^{]*\{[\s\S]*?\}/g);
            rules = rules.map(function(rule) { return rule.trim(); });

            rules.forEach(function(rule) {

              var match = rule.match(/([\s\S]*?)\s*\{([^}]*)\}/),
              ruleObj = { }, declaration = match[2].trim(),
              propertyValuePairs = declaration.replace(/;$/, '').split(/\s*;\s*/);

              for (var i = 0, len = propertyValuePairs.length; i < len; i++) {
                var pair = propertyValuePairs[i].split(/\s*:\s*/),
                    property = normalizeAttr(pair[0]),
                    value = normalizeValue(property, pair[1], pair[0]);
                ruleObj[property] = value;
              }
              rule = match[1];
              rule.split(',').forEach(function(_rule) {
                _rule = _rule.replace(/^svg/i, '').trim();
                Iif (_rule === '') {
                  return;
                }
                allRules[_rule] = fabric.util.object.clone(ruleObj);
              });
            });
          }
          return allRules;
        },

        /**
         * Takes url corresponding to an SVG document, and parses it into a set of fabric objects. Note that SVG is fetched via XMLHttpRequest, so it needs to conform to SOP (Same Origin Policy)
         * @memberOf fabric
         * @param {String} url
         * @param {Function} callback
         * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
         */
        loadSVGFromURL: function(url, callback, reviver) {

          url = url.replace(/^\n\s*/, '').trim();
          svgCache.has(url, function (hasUrl) {
            if (hasUrl) {
              svgCache.get(url, function (value) {
                var enlivedRecord = _enlivenCachedObject(value);
                callback(enlivedRecord.objects, enlivedRecord.options);
              });
            }
            else {
              new fabric.util.request(url, {
                method: 'get',
                onComplete: onComplete
              });
            }
          });

          function onComplete(r) {

            var xml = r.responseXML;
            if (xml && !xml.documentElement && fabric.window.ActiveXObject && r.responseText) {
              xml = new ActiveXObject('Microsoft.XMLDOM');
              xml.async = 'false';
              //IE chokes on DOCTYPE
              xml.loadXML(r.responseText.replace(/<!DOCTYPE[\s\S]*?(\[[\s\S]*\])*?>/i, ''));
            }
            if (!xml || !xml.documentElement) {
              return;
            }

            fabric.parseSVGDocument(xml.documentElement, function (results, options) {
              svgCache.set(url, {
                objects: fabric.util.array.invoke(results, 'toObject'),
                options: options
              });
              callback(results, options);
            }, reviver);
          }
        },

        /**
         * Takes string corresponding to an SVG document, and parses it into a set of fabric objects
         * @memberOf fabric
         * @param {String} string
         * @param {Function} callback
         * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
         */
        loadSVGFromString: function(string, callback, reviver) {
          string = string.trim();
          var doc;
          if (typeof DOMParser !== 'undefined') {
            var parser = new DOMParser();
            if (parser && parser.parseFromString) {
              doc = parser.parseFromString(string, 'text/xml');
            }
          }
          else if (fabric.window.ActiveXObject) {
            doc = new ActiveXObject('Microsoft.XMLDOM');
            doc.async = 'false';
            // IE chokes on DOCTYPE
            doc.loadXML(string.replace(/<!DOCTYPE[\s\S]*?(\[[\s\S]*\])*?>/i, ''));
          }

          fabric.parseSVGDocument(doc.documentElement, function (results, options) {
            callback(results, options);
          }, reviver);
        },

        /**
         * Creates markup containing SVG font faces,
         * font URLs for font faces must be collected by developers
         * and are not extracted from the DOM by fabricjs
         * @param {Array} objects Array of fabric objects
         * @return {String}
         */
        createSVGFontFacesMarkup: function(objects) {
          var markup = '', fontList = { }, obj, fontFamily,
              style, row, rowIndex, _char, charIndex,
              fontPaths = fabric.fontPaths;

          for (var i = 0, len = objects.length; i < len; i++) {
            obj = objects[i];
            fontFamily = obj.fontFamily;
            Eif (obj.type.indexOf('text') === -1 || fontList[fontFamily] || !fontPaths[fontFamily]) {
              continue;
            }
            fontList[fontFamily] = true;
            if (!obj.styles) {
              continue;
            }
            style = obj.styles;
            for (rowIndex in style) {
              row = style[rowIndex];
              for (charIndex in row) {
                _char = row[charIndex];
                fontFamily = _char.fontFamily;
                if (!fontList[fontFamily] && fontPaths[fontFamily]) {
                  fontList[fontFamily] = true;
                }
              }
            }
          }

          for (var j in fontList) {
            markup += [
              //jscs:disable validateIndentation
              '\t\t@font-face {\n',
                '\t\t\tfont-family: \'', j, '\';\n',
                '\t\t\tsrc: url(\'', fontPaths[j], '\');\n',
              '\t\t}\n'
              //jscs:enable validateIndentation
            ].join('');
          }

          Iif (markup) {
            markup = [
              //jscs:disable validateIndentation
              '\t<style type="text/css">',
                '<![CDATA[\n',
                  markup,
                ']]>',
              '</style>\n'
              //jscs:enable validateIndentation
            ].join('');
          }

          return markup;
        },

        /**
         * Creates markup containing SVG referenced elements like patterns, gradients etc.
         * @param {fabric.Canvas} canvas instance of fabric.Canvas
         * @return {String}
         */
        createSVGRefElementsMarkup: function(canvas) {
          var markup = [ ];

          _createSVGPattern(markup, canvas, 'backgroundColor');
          _createSVGPattern(markup, canvas, 'overlayColor');

          return markup.join('');
        }
      });

    })(typeof exports !== 'undefined' ? exports : this);

    fabric.ElementsParser = function(elements, callback, options, reviver) {
      this.elements = elements;
      this.callback = callback;
      this.options = options;
      this.reviver = reviver;
      this.svgUid = (options && options.svgUid) || 0;
    };

    fabric.ElementsParser.prototype.parse = function() {
      this.instances = new Array(this.elements.length);
      this.numElements = this.elements.length;

      this.createObjects();
    };

    fabric.ElementsParser.prototype.createObjects = function() {
      for (var i = 0, len = this.elements.length; i < len; i++) {
        this.elements[i].setAttribute('svgUid', this.svgUid);
        (function(_this, i) {
          setTimeout(function() {
            _this.createObject(_this.elements[i], i);
          }, 0);
        })(this, i);
      }
    };

    fabric.ElementsParser.prototype.createObject = function(el, index) {
      var klass = fabric[fabric.util.string.capitalize(el.tagName)];
      if (klass && klass.fromElement) {
        try {
          this._createObject(klass, el, index);
        }
        catch (err) {
          fabric.log(err);
        }
      }
      else {
        this.checkIfDone();
      }
    };

    fabric.ElementsParser.prototype._createObject = function(klass, el, index) {
      if (klass.async) {
        klass.fromElement(el, this.createCallback(index, el), this.options);
      }
      else {
        var obj = klass.fromElement(el, this.options);
        this.resolveGradient(obj, 'fill');
        this.resolveGradient(obj, 'stroke');
        this.reviver && this.reviver(el, obj);
        this.instances[index] = obj;
        this.checkIfDone();
      }
    };

    fabric.ElementsParser.prototype.createCallback = function(index, el) {
      var _this = this;
      return function(obj) {
        _this.resolveGradient(obj, 'fill');
        _this.resolveGradient(obj, 'stroke');
        _this.reviver && _this.reviver(el, obj);
        _this.instances[index] = obj;
        _this.checkIfDone();
      };
    };

    fabric.ElementsParser.prototype.resolveGradient = function(obj, property) {

      var instanceFillValue = obj.get(property);
      Eif (!(/^url\(/).test(instanceFillValue)) {
        return;
      }
      var gradientId = instanceFillValue.slice(5, instanceFillValue.length - 1);
      if (fabric.gradientDefs[this.svgUid][gradientId]) {
        obj.set(property,
          fabric.Gradient.fromElement(fabric.gradientDefs[this.svgUid][gradientId], obj));
      }
    };

    fabric.ElementsParser.prototype.checkIfDone = function() {
      if (--this.numElements === 0) {
        this.instances = this.instances.filter(function(el) {
          return el != null;
        });
        this.callback(this.instances);
      }
    };

    (function(global) {

      'use strict';

      /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */

      var fabric = global.fabric || (global.fabric = { });

      Iif (fabric.Point) {
        fabric.warn('fabric.Point is already defined');
        return;
      }

      fabric.Point = Point;

      /**
       * Point class
       * @class fabric.Point
       * @memberOf fabric
       * @constructor
       * @param {Number} x
       * @param {Number} y
       * @return {fabric.Point} thisArg
       */
      function Point(x, y) {
        this.x = x;
        this.y = y;
      }

      Point.prototype = /** @lends fabric.Point.prototype */ {

        constructor: Point,

        /**
         * Adds another point to this one and returns another one
         * @param {fabric.Point} that
         * @return {fabric.Point} new Point instance with added values
         */
        add: function (that) {
          return new Point(this.x + that.x, this.y + that.y);
        },

        /**
         * Adds another point to this one
         * @param {fabric.Point} that
         * @return {fabric.Point} thisArg
         */
        addEquals: function (that) {
          this.x += that.x;
          this.y += that.y;
          return this;
        },

        /**
         * Adds value to this point and returns a new one
         * @param {Number} scalar
         * @return {fabric.Point} new Point with added value
         */
        scalarAdd: function (scalar) {
          return new Point(this.x + scalar, this.y + scalar);
        },

        /**
         * Adds value to this point
         * @param {Number} scalar
         * @return {fabric.Point} thisArg
         */
        scalarAddEquals: function (scalar) {
          this.x += scalar;
          this.y += scalar;
          return this;
        },

        /**
         * Subtracts another point from this point and returns a new one
         * @param {fabric.Point} that
         * @return {fabric.Point} new Point object with subtracted values
         */
        subtract: function (that) {
          return new Point(this.x - that.x, this.y - that.y);
        },

        /**
         * Subtracts another point from this point
         * @param {fabric.Point} that
         * @return {fabric.Point} thisArg
         */
        subtractEquals: function (that) {
          this.x -= that.x;
          this.y -= that.y;
          return this;
        },

        /**
         * Subtracts value from this point and returns a new one
         * @param {Number} scalar
         * @return {fabric.Point}
         */
        scalarSubtract: function (scalar) {
          return new Point(this.x - scalar, this.y - scalar);
        },

        /**
         * Subtracts value from this point
         * @param {Number} scalar
         * @return {fabric.Point} thisArg
         */
        scalarSubtractEquals: function (scalar) {
          this.x -= scalar;
          this.y -= scalar;
          return this;
        },

        /**
         * Miltiplies this point by a value and returns a new one
         * @param {Number} scalar
         * @return {fabric.Point}
         */
        multiply: function (scalar) {
          return new Point(this.x * scalar, this.y * scalar);
        },

        /**
         * Miltiplies this point by a value
         * @param {Number} scalar
         * @return {fabric.Point} thisArg
         */
        multiplyEquals: function (scalar) {
          this.x *= scalar;
          this.y *= scalar;
          return this;
        },

        /**
         * Divides this point by a value and returns a new one
         * @param {Number} scalar
         * @return {fabric.Point}
         */
        divide: function (scalar) {
          return new Point(this.x / scalar, this.y / scalar);
        },

        /**
         * Divides this point by a value
         * @param {Number} scalar
         * @return {fabric.Point} thisArg
         */
        divideEquals: function (scalar) {
          this.x /= scalar;
          this.y /= scalar;
          return this;
        },

        /**
         * Returns true if this point is equal to another one
         * @param {fabric.Point} that
         * @return {Boolean}
         */
        eq: function (that) {
          return (this.x === that.x && this.y === that.y);
        },

        /**
         * Returns true if this point is less than another one
         * @param {fabric.Point} that
         * @return {Boolean}
         */
        lt: function (that) {
          return (this.x < that.x && this.y < that.y);
        },

        /**
         * Returns true if this point is less than or equal to another one
         * @param {fabric.Point} that
         * @return {Boolean}
         */
        lte: function (that) {
          return (this.x <= that.x && this.y <= that.y);
        },

        /**

         * Returns true if this point is greater another one
         * @param {fabric.Point} that
         * @return {Boolean}
         */
        gt: function (that) {
          return (this.x > that.x && this.y > that.y);
        },

        /**
         * Returns true if this point is greater than or equal to another one
         * @param {fabric.Point} that
         * @return {Boolean}
         */
        gte: function (that) {
          return (this.x >= that.x && this.y >= that.y);
        },

        /**
         * Returns new point which is the result of linear interpolation with this one and another one
         * @param {fabric.Point} that
         * @param {Number} t
         * @return {fabric.Point}
         */
        lerp: function (that, t) {
          return new Point(this.x + (that.x - this.x) * t, this.y + (that.y - this.y) * t);
        },

        /**
         * Returns distance from this point and another one
         * @param {fabric.Point} that
         * @return {Number}
         */
        distanceFrom: function (that) {
          var dx = this.x - that.x,
              dy = this.y - that.y;
          return Math.sqrt(dx * dx + dy * dy);
        },

        /**
         * Returns the point between this point and another one
         * @param {fabric.Point} that
         * @return {fabric.Point}
         */
        midPointFrom: function (that) {
          return new Point(this.x + (that.x - this.x)/2, this.y + (that.y - this.y)/2);
        },

        /**
         * Returns a new point which is the min of this and another one
         * @param {fabric.Point} that
         * @return {fabric.Point}
         */
        min: function (that) {
          return new Point(Math.min(this.x, that.x), Math.min(this.y, that.y));
        },

        /**
         * Returns a new point which is the max of this and another one
         * @param {fabric.Point} that
         * @return {fabric.Point}
         */
        max: function (that) {
          return new Point(Math.max(this.x, that.x), Math.max(this.y, that.y));
        },

        /**
         * Returns string representation of this point
         * @return {String}
         */
        toString: function () {
          return this.x + ',' + this.y;
        },

        /**
         * Sets x/y of this point
         * @param {Number} x
         * @param {Number} y
         */
        setXY: function (x, y) {
          this.x = x;
          this.y = y;
        },

        /**
         * Sets x/y of this point from another point
         * @param {fabric.Point} that
         */
        setFromPoint: function (that) {
          this.x = that.x;
          this.y = that.y;
        },

        /**
         * Swaps x/y of this point and another point
         * @param {fabric.Point} that
         */
        swap: function (that) {
          var x = this.x,
              y = this.y;
          this.x = that.x;
          this.y = that.y;
          that.x = x;
          that.y = y;
        }
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */
      var fabric = global.fabric || (global.fabric = { });

      Iif (fabric.Intersection) {
        fabric.warn('fabric.Intersection is already defined');
        return;
      }

      /**
       * Intersection class
       * @class fabric.Intersection
       * @memberOf fabric
       * @constructor
       */
      function Intersection(status) {
        this.status = status;
        this.points = [];
      }

      fabric.Intersection = Intersection;

      fabric.Intersection.prototype = /** @lends fabric.Intersection.prototype */ {

        /**
         * Appends a point to intersection
         * @param {fabric.Point} point
         */
        appendPoint: function (point) {
          this.points.push(point);
        },

        /**
         * Appends points to intersection
         * @param {Array} points
         */
        appendPoints: function (points) {
          this.points = this.points.concat(points);
        }
      };

      /**
       * Checks if one line intersects another
       * @static
       * @param {fabric.Point} a1
       * @param {fabric.Point} a2
       * @param {fabric.Point} b1
       * @param {fabric.Point} b2
       * @return {fabric.Intersection}
       */
      fabric.Intersection.intersectLineLine = function (a1, a2, b1, b2) {
        var result,
            uaT = (b2.x - b1.x) * (a1.y - b1.y) - (b2.y - b1.y) * (a1.x - b1.x),
            ubT = (a2.x - a1.x) * (a1.y - b1.y) - (a2.y - a1.y) * (a1.x - b1.x),
            uB = (b2.y - b1.y) * (a2.x - a1.x) - (b2.x - b1.x) * (a2.y - a1.y);
        if (uB !== 0) {
          var ua = uaT / uB,
              ub = ubT / uB;
          if (0 <= ua && ua <= 1 && 0 <= ub && ub <= 1) {
            result = new Intersection('Intersection');
            result.points.push(new fabric.Point(a1.x + ua * (a2.x - a1.x), a1.y + ua * (a2.y - a1.y)));
          }
          else {
            result = new Intersection();
          }
        }
        else {
          Iif (uaT === 0 || ubT === 0) {
            result = new Intersection('Coincident');
          }
          else {
            result = new Intersection('Parallel');
          }
        }
        return result;
      };

      /**
       * Checks if line intersects polygon
       * @static
       * @param {fabric.Point} a1
       * @param {fabric.Point} a2
       * @param {Array} points
       * @return {fabric.Intersection}
       */
      fabric.Intersection.intersectLinePolygon = function(a1, a2, points) {
        var result = new Intersection(),
            length = points.length;

        for (var i = 0; i < length; i++) {
          var b1 = points[i],
              b2 = points[(i + 1) % length],
              inter = Intersection.intersectLineLine(a1, a2, b1, b2);

          result.appendPoints(inter.points);
        }
        if (result.points.length > 0) {
          result.status = 'Intersection';
        }
        return result;
      };

      /**
       * Checks if polygon intersects another polygon
       * @static
       * @param {Array} points1
       * @param {Array} points2
       * @return {fabric.Intersection}
       */
      fabric.Intersection.intersectPolygonPolygon = function (points1, points2) {
        var result = new Intersection(),
            length = points1.length;

        for (var i = 0; i < length; i++) {
          var a1 = points1[i],
              a2 = points1[(i + 1) % length],
              inter = Intersection.intersectLinePolygon(a1, a2, points2);

          result.appendPoints(inter.points);
        }
        if (result.points.length > 0) {
          result.status = 'Intersection';
        }
        return result;
      };

      /**
       * Checks if polygon intersects rectangle
       * @static
       * @param {Array} points
       * @param {Number} r1
       * @param {Number} r2
       * @return {fabric.Intersection}
       */
      fabric.Intersection.intersectPolygonRectangle = function (points, r1, r2) {
        var min = r1.min(r2),
            max = r1.max(r2),
            topRight = new fabric.Point(max.x, min.y),
            bottomLeft = new fabric.Point(min.x, max.y),
            inter1 = Intersection.intersectLinePolygon(min, topRight, points),
            inter2 = Intersection.intersectLinePolygon(topRight, max, points),
            inter3 = Intersection.intersectLinePolygon(max, bottomLeft, points),
            inter4 = Intersection.intersectLinePolygon(bottomLeft, min, points),
            result = new Intersection();

        result.appendPoints(inter1.points);
        result.appendPoints(inter2.points);
        result.appendPoints(inter3.points);
        result.appendPoints(inter4.points);

        if (result.points.length > 0) {
          result.status = 'Intersection';
        }
        return result;
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { });

      Iif (fabric.Color) {
        fabric.warn('fabric.Color is already defined.');
        return;
      }

      /**
       * Color class
       * The purpose of {@link fabric.Color} is to abstract and encapsulate common color operations;
       * {@link fabric.Color} is a constructor and creates instances of {@link fabric.Color} objects.
       *
       * @class fabric.Color
       * @param {String} color optional in hex or rgb(a) or hsl format or from known color list
       * @return {fabric.Color} thisArg
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-2/#colors}
       */
      function Color(color) {
        if (!color) {
          this.setSource([0, 0, 0, 1]);
        }
        else {
          this._tryParsingColor(color);
        }
      }

      fabric.Color = Color;

      fabric.Color.prototype = /** @lends fabric.Color.prototype */ {

        /**
         * @private
         * @param {String|Array} color Color value to parse
         */
        _tryParsingColor: function(color) {
          var source;

          if (color in Color.colorNameMap) {
            color = Color.colorNameMap[color];
          }

          if (color === 'transparent') {
            source = [255, 255, 255, 0];
          }

          if (!source) {
            source = Color.sourceFromHex(color);
          }
          if (!source) {
            source = Color.sourceFromRgb(color);
          }
          if (!source) {
            source = Color.sourceFromHsl(color);
          }
          Iif (!source) {
            //if color is not recognize let's make black as canvas does
            source = [0, 0, 0, 1];
          }
          Eif (source) {
            this.setSource(source);
          }
        },

        /**
         * Adapted from <a href="https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html">https://github.com/mjijackson</a>
         * @private
         * @param {Number} r Red color value
         * @param {Number} g Green color value
         * @param {Number} b Blue color value
         * @return {Array} Hsl color
         */
        _rgbToHsl: function(r, g, b) {
          r /= 255, g /= 255, b /= 255;

          var h, s, l,
              max = fabric.util.array.max([r, g, b]),
              min = fabric.util.array.min([r, g, b]);

          l = (max + min) / 2;

          if (max === min) {
            h = s = 0; // achromatic
          }
          else {
            var d = max - min;
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            switch (max) {
              case r:
                h = (g - b) / d + (g < b ? 6 : 0);
                break;
              case g:
                h = (b - r) / d + 2;
                break;
              case b:
                h = (r - g) / d + 4;
                break;
            }
            h /= 6;
          }

          return [
            Math.round(h * 360),
            Math.round(s * 100),
            Math.round(l * 100)
          ];
        },

        /**
         * Returns source of this color (where source is an array representation; ex: [200, 200, 100, 1])
         * @return {Array}
         */
        getSource: function() {
          return this._source;
        },

        /**
         * Sets source of this color (where source is an array representation; ex: [200, 200, 100, 1])
         * @param {Array} source
         */
        setSource: function(source) {
          this._source = source;
        },

        /**
         * Returns color represenation in RGB format
         * @return {String} ex: rgb(0-255,0-255,0-255)
         */
        toRgb: function() {
          var source = this.getSource();
          return 'rgb(' + source[0] + ',' + source[1] + ',' + source[2] + ')';
        },

        /**
         * Returns color represenation in RGBA format
         * @return {String} ex: rgba(0-255,0-255,0-255,0-1)
         */
        toRgba: function() {
          var source = this.getSource();
          return 'rgba(' + source[0] + ',' + source[1] + ',' + source[2] + ',' + source[3] + ')';
        },

        /**
         * Returns color represenation in HSL format
         * @return {String} ex: hsl(0-360,0%-100%,0%-100%)
         */
        toHsl: function() {
          var source = this.getSource(),
              hsl = this._rgbToHsl(source[0], source[1], source[2]);

          return 'hsl(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%)';
        },

        /**
         * Returns color represenation in HSLA format
         * @return {String} ex: hsla(0-360,0%-100%,0%-100%,0-1)
         */
        toHsla: function() {
          var source = this.getSource(),
              hsl = this._rgbToHsl(source[0], source[1], source[2]);

          return 'hsla(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%,' + source[3] + ')';
        },

        /**
         * Returns color represenation in HEX format
         * @return {String} ex: FF5555
         */
        toHex: function() {
          var source = this.getSource(), r, g, b;

          r = source[0].toString(16);
          r = (r.length === 1) ? ('0' + r) : r;

          g = source[1].toString(16);
          g = (g.length === 1) ? ('0' + g) : g;

          b = source[2].toString(16);
          b = (b.length === 1) ? ('0' + b) : b;

          return r.toUpperCase() + g.toUpperCase() + b.toUpperCase();
        },

        /**
         * Gets value of alpha channel for this color
         * @return {Number} 0-1
         */
        getAlpha: function() {
          return this.getSource()[3];
        },

        /**
         * Sets value of alpha channel for this color
         * @param {Number} alpha Alpha value 0-1
         * @return {fabric.Color} thisArg
         */
        setAlpha: function(alpha) {
          var source = this.getSource();
          source[3] = alpha;
          this.setSource(source);
          return this;
        },

        /**
         * Transforms color to its grayscale representation
         * @return {fabric.Color} thisArg
         */
        toGrayscale: function() {
          var source = this.getSource(),
              average = parseInt((source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0), 10),
              currentAlpha = source[3];
          this.setSource([average, average, average, currentAlpha]);
          return this;
        },

        /**
         * Transforms color to its black and white representation
         * @param {Number} threshold
         * @return {fabric.Color} thisArg
         */
        toBlackWhite: function(threshold) {
          var source = this.getSource(),
              average = (source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0),
              currentAlpha = source[3];

          threshold = threshold || 127;

          average = (Number(average) < Number(threshold)) ? 0 : 255;
          this.setSource([average, average, average, currentAlpha]);
          return this;
        },

        /**
         * Overlays color with another color
         * @param {String|fabric.Color} otherColor
         * @return {fabric.Color} thisArg
         */
        overlayWith: function(otherColor) {
          if (!(otherColor instanceof Color)) {
            otherColor = new Color(otherColor);
          }

          var result = [],
              alpha = this.getAlpha(),
              otherAlpha = 0.5,
              source = this.getSource(),
              otherSource = otherColor.getSource();

          for (var i = 0; i < 3; i++) {
            result.push(Math.round((source[i] * (1 - otherAlpha)) + (otherSource[i] * otherAlpha)));
          }

          result[3] = alpha;
          this.setSource(result);
          return this;
        }
      };

      /**
       * Regex matching color in RGB or RGBA formats (ex: rgb(0, 0, 0), rgba(255, 100, 10, 0.5), rgba( 255 , 100 , 10 , 0.5 ), rgb(1,1,1), rgba(100%, 60%, 10%, 0.5))
       * @static
       * @field
       * @memberOf fabric.Color
       */
      fabric.Color.reRGBa = /^rgba?\(\s*(\d{1,3}(?:\.\d+)?\%?)\s*,\s*(\d{1,3}(?:\.\d+)?\%?)\s*,\s*(\d{1,3}(?:\.\d+)?\%?)\s*(?:\s*,\s*(\d+(?:\.\d+)?)\s*)?\)$/;

      /**
       * Regex matching color in HSL or HSLA formats (ex: hsl(200, 80%, 10%), hsla(300, 50%, 80%, 0.5), hsla( 300 , 50% , 80% , 0.5 ))
       * @static
       * @field
       * @memberOf fabric.Color
       */
      fabric.Color.reHSLa = /^hsla?\(\s*(\d{1,3})\s*,\s*(\d{1,3}\%)\s*,\s*(\d{1,3}\%)\s*(?:\s*,\s*(\d+(?:\.\d+)?)\s*)?\)$/;

      /**
       * Regex matching color in HEX format (ex: #FF5555, 010155, aff)
       * @static
       * @field
       * @memberOf fabric.Color
       */
      fabric.Color.reHex = /^#?([0-9a-f]{6}|[0-9a-f]{3})$/i;

      /**
       * Map of the 17 basic color names with HEX code
       * @static
       * @field
       * @memberOf fabric.Color
       * @see: http://www.w3.org/TR/CSS2/syndata.html#color-units
       */
      fabric.Color.colorNameMap = {
        aqua:    '#00FFFF',
        black:   '#000000',
        blue:    '#0000FF',
        fuchsia: '#FF00FF',
        gray:    '#808080',
        grey:    '#808080',
        green:   '#008000',
        lime:    '#00FF00',
        maroon:  '#800000',
        navy:    '#000080',
        olive:   '#808000',
        orange:  '#FFA500',
        purple:  '#800080',
        red:     '#FF0000',
        silver:  '#C0C0C0',
        teal:    '#008080',
        white:   '#FFFFFF',
        yellow:  '#FFFF00'
      };

      /**
       * @private
       * @param {Number} p
       * @param {Number} q
       * @param {Number} t
       * @return {Number}
       */
      function hue2rgb(p, q, t) {
        if (t < 0) {
          t += 1;
        }
        if (t > 1) {
          t -= 1;
        }
        if (t < 1/6) {
          return p + (q - p) * 6 * t;
        }
        if (t < 1/2) {
          return q;
        }
        if (t < 2/3) {
          return p + (q - p) * (2/3 - t) * 6;
        }
        return p;
      }

      /**
       * Returns new color object, when given a color in RGB format
       * @memberOf fabric.Color
       * @param {String} color Color value ex: rgb(0-255,0-255,0-255)
       * @return {fabric.Color}
       */
      fabric.Color.fromRgb = function(color) {
        return Color.fromSource(Color.sourceFromRgb(color));
      };

      /**
       * Returns array represenatation (ex: [100, 100, 200, 1]) of a color that's in RGB or RGBA format
       * @memberOf fabric.Color
       * @param {String} color Color value ex: rgb(0-255,0-255,0-255), rgb(0%-100%,0%-100%,0%-100%)
       * @return {Array} source
       */
      fabric.Color.sourceFromRgb = function(color) {
        var match = color.match(Color.reRGBa);
        if (match) {
          var r = parseInt(match[1], 10) / (/%$/.test(match[1]) ? 100 : 1) * (/%$/.test(match[1]) ? 255 : 1),
              g = parseInt(match[2], 10) / (/%$/.test(match[2]) ? 100 : 1) * (/%$/.test(match[2]) ? 255 : 1),
              b = parseInt(match[3], 10) / (/%$/.test(match[3]) ? 100 : 1) * (/%$/.test(match[3]) ? 255 : 1);

          return [
            parseInt(r, 10),
            parseInt(g, 10),
            parseInt(b, 10),
            match[4] ? parseFloat(match[4]) : 1
          ];
        }
      };

      /**
       * Returns new color object, when given a color in RGBA format
       * @static
       * @function
       * @memberOf fabric.Color
       * @param {String} color
       * @return {fabric.Color}
       */
      fabric.Color.fromRgba = Color.fromRgb;

      /**
       * Returns new color object, when given a color in HSL format
       * @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)
       * @memberOf fabric.Color
       * @return {fabric.Color}
       */
      fabric.Color.fromHsl = function(color) {
        return Color.fromSource(Color.sourceFromHsl(color));
      };

      /**
       * Returns array represenatation (ex: [100, 100, 200, 1]) of a color that's in HSL or HSLA format.
       * Adapted from <a href="https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html">https://github.com/mjijackson</a>
       * @memberOf fabric.Color
       * @param {String} color Color value ex: hsl(0-360,0%-100%,0%-100%) or hsla(0-360,0%-100%,0%-100%, 0-1)
       * @return {Array} source
       * @see http://http://www.w3.org/TR/css3-color/#hsl-color
       */
      fabric.Color.sourceFromHsl = function(color) {
        var match = color.match(Color.reHSLa);
        Iif (!match) {
          return;
        }

        var h = (((parseFloat(match[1]) % 360) + 360) % 360) / 360,
            s = parseFloat(match[2]) / (/%$/.test(match[2]) ? 100 : 1),
            l = parseFloat(match[3]) / (/%$/.test(match[3]) ? 100 : 1),
            r, g, b;

        Iif (s === 0) {
          r = g = b = l;
        }
        else {
          var q = l <= 0.5 ? l * (s + 1) : l + s - l * s,
              p = l * 2 - q;

          r = hue2rgb(p, q, h + 1/3);
          g = hue2rgb(p, q, h);
          b = hue2rgb(p, q, h - 1/3);
        }

        return [
          Math.round(r * 255),
          Math.round(g * 255),
          Math.round(b * 255),
          match[4] ? parseFloat(match[4]) : 1
        ];
      };

      /**
       * Returns new color object, when given a color in HSLA format
       * @static
       * @function
       * @memberOf fabric.Color
       * @param {String} color
       * @return {fabric.Color}
       */
      fabric.Color.fromHsla = Color.fromHsl;

      /**
       * Returns new color object, when given a color in HEX format
       * @static
       * @memberOf fabric.Color
       * @param {String} color Color value ex: FF5555
       * @return {fabric.Color}
       */
      fabric.Color.fromHex = function(color) {
        return Color.fromSource(Color.sourceFromHex(color));
      };

      /**
       * Returns array represenatation (ex: [100, 100, 200, 1]) of a color that's in HEX format
       * @static
       * @memberOf fabric.Color
       * @param {String} color ex: FF5555
       * @return {Array} source
       */
      fabric.Color.sourceFromHex = function(color) {
        if (color.match(Color.reHex)) {
          var value = color.slice(color.indexOf('#') + 1),
              isShortNotation = (value.length === 3),
              r = isShortNotation ? (value.charAt(0) + value.charAt(0)) : value.substring(0, 2),
              g = isShortNotation ? (value.charAt(1) + value.charAt(1)) : value.substring(2, 4),
              b = isShortNotation ? (value.charAt(2) + value.charAt(2)) : value.substring(4, 6);

          return [
            parseInt(r, 16),
            parseInt(g, 16),
            parseInt(b, 16),
            1
          ];
        }
      };

      /**
       * Returns new color object, when given color in array representation (ex: [200, 100, 100, 0.5])
       * @static
       * @memberOf fabric.Color
       * @param {Array} source
       * @return {fabric.Color}
       */
      fabric.Color.fromSource = function(source) {
        var oColor = new Color();
        oColor.setSource(source);
        return oColor;
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function() {

      /* _FROM_SVG_START_ */
      function getColorStop(el) {
        var style = el.getAttribute('style'),
            offset = el.getAttribute('offset') || 0,
            color, colorAlpha, opacity;

        // convert percents to absolute values
        offset = parseFloat(offset) / (/%$/.test(offset) ? 100 : 1);
        offset = offset < 0 ? 0 : offset > 1 ? 1 : offset;
        if (style) {
          var keyValuePairs = style.split(/\s*;\s*/);

          Eif (keyValuePairs[keyValuePairs.length - 1] === '') {
            keyValuePairs.pop();
          }

          for (var i = keyValuePairs.length; i--; ) {

            var split = keyValuePairs[i].split(/\s*:\s*/),
                key = split[0].trim(),
                value = split[1].trim();

            if (key === 'stop-color') {
              color = value;
            }
            else Eif (key === 'stop-opacity') {
              opacity = value;
            }
          }
        }

        if (!color) {
          color = el.getAttribute('stop-color') || 'rgb(0,0,0)';
        }
        if (!opacity) {
          opacity = el.getAttribute('stop-opacity');
        }

        color = new fabric.Color(color);
        colorAlpha = color.getAlpha();
        opacity = isNaN(parseFloat(opacity)) ? 1 : parseFloat(opacity);
        opacity *= colorAlpha;

        return {
          offset: offset,
          color: color.toRgb(),
          opacity: opacity
        };
      }

      function getLinearCoords(el) {
        return {
          x1: el.getAttribute('x1') || 0,
          y1: el.getAttribute('y1') || 0,
          x2: el.getAttribute('x2') || '100%',
          y2: el.getAttribute('y2') || 0
        };
      }

      function getRadialCoords(el) {
        return {
          x1: el.getAttribute('fx') || el.getAttribute('cx') || '50%',
          y1: el.getAttribute('fy') || el.getAttribute('cy') || '50%',
          r1: 0,
          x2: el.getAttribute('cx') || '50%',
          y2: el.getAttribute('cy') || '50%',
          r2: el.getAttribute('r') || '50%'
        };
      }
      /* _FROM_SVG_END_ */

      /**
       * Gradient class
       * @class fabric.Gradient
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#gradients}
       * @see {@link fabric.Gradient#initialize} for constructor definition
       */
      fabric.Gradient = fabric.util.createClass(/** @lends fabric.Gradient.prototype */ {

        /**
         * Horizontal offset for aligning gradients coming from SVG when outside pathgroups
         * @type Number
         * @default 0
         */
        offsetX: 0,

        /**
         * Vertical offset for aligning gradients coming from SVG when outside pathgroups
         * @type Number
         * @default 0
         */
        offsetY: 0,

        /**
         * Constructor
         * @param {Object} [options] Options object with type, coords, gradientUnits and colorStops
         * @return {fabric.Gradient} thisArg
         */
        initialize: function(options) {
          options || (options = { });

          var coords = { };

          this.id = fabric.Object.__uid++;
          this.type = options.type || 'linear';

          coords = {
            x1: options.coords.x1 || 0,
            y1: options.coords.y1 || 0,
            x2: options.coords.x2 || 0,
            y2: options.coords.y2 || 0
          };

          if (this.type === 'radial') {
            coords.r1 = options.coords.r1 || 0;
            coords.r2 = options.coords.r2 || 0;
          }
          this.coords = coords;
          this.colorStops = options.colorStops.slice();
          if (options.gradientTransform) {
            this.gradientTransform = options.gradientTransform;
          }
          this.offsetX = options.offsetX || this.offsetX;
          this.offsetY = options.offsetY || this.offsetY;
        },

        /**
         * Adds another colorStop
         * @param {Object} colorStop Object with offset and color
         * @return {fabric.Gradient} thisArg
         */
        addColorStop: function(colorStop) {
          for (var position in colorStop) {
            var color = new fabric.Color(colorStop[position]);
            this.colorStops.push({
              offset: position,
              color: color.toRgb(),
              opacity: color.getAlpha()
            });
          }
          return this;
        },

        /**
         * Returns object representation of a gradient
         * @return {Object}
         */
        toObject: function() {
          return {
            type: this.type,
            coords: this.coords,
            colorStops: this.colorStops,
            offsetX: this.offsetX,
            offsetY: this.offsetY,
            gradientTransform: this.gradientTransform ? this.gradientTransform.concat() : this.gradientTransform
          };
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of an gradient
         * @param {Object} object Object to create a gradient for
         * @param {Boolean} normalize Whether coords should be normalized
         * @return {String} SVG representation of an gradient (linear/radial)
         */
        toSVG: function(object) {
          var coords = fabric.util.object.clone(this.coords),
              markup, commonAttributes;

          // colorStops must be sorted ascending
          this.colorStops.sort(function(a, b) {
            return a.offset - b.offset;
          });

          if (!(object.group && object.group.type === 'path-group')) {
            for (var prop in coords) {
              if (prop === 'x1' || prop === 'x2' || prop === 'r2') {
                coords[prop] += this.offsetX - object.width / 2;
              }
              else if (prop === 'y1' || prop === 'y2') {
                coords[prop] += this.offsetY - object.height / 2;
              }
            }
          }

          commonAttributes = 'id="SVGID_' + this.id +
                         '" gradientUnits="userSpaceOnUse"';
          if (this.gradientTransform) {
            commonAttributes += ' gradientTransform="matrix(' + this.gradientTransform.join(' ') + ')" ';
          }
          if (this.type === 'linear') {
            markup = [
              //jscs:disable validateIndentation
              '<linearGradient ',
                commonAttributes,
                ' x1="', coords.x1,
                '" y1="', coords.y1,
                '" x2="', coords.x2,
                '" y2="', coords.y2,
              '">\n'
              //jscs:enable validateIndentation
            ];
          }
          else if (this.type === 'radial') {
            markup = [
              //jscs:disable validateIndentation
              '<radialGradient ',
                commonAttributes,
                ' cx="', coords.x2,
                '" cy="', coords.y2,
                '" r="', coords.r2,
                '" fx="', coords.x1,
                '" fy="', coords.y1,
              '">\n'
              //jscs:enable validateIndentation
            ];
          }

          for (var i = 0; i < this.colorStops.length; i++) {
            markup.push(
              //jscs:disable validateIndentation
              '<stop ',
                'offset="', (this.colorStops[i].offset * 100) + '%',
                '" style="stop-color:', this.colorStops[i].color,
                (this.colorStops[i].opacity != null ? ';stop-opacity: ' + this.colorStops[i].opacity : ';'),
              '"/>\n'
              //jscs:enable validateIndentation
            );
          }

          markup.push((this.type === 'linear' ? '</linearGradient>\n' : '</radialGradient>\n'));

          return markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns an instance of CanvasGradient
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @return {CanvasGradient}
         */
        toLive: function(ctx, object) {
          var gradient, prop, coords = fabric.util.object.clone(this.coords);

          if (!this.type) {
            return;
          }

          if (object.group && object.group.type === 'path-group') {
            for (prop in coords) {
              if (prop === 'x1' || prop === 'x2') {
                coords[prop] += -this.offsetX + object.width / 2;
              }
              else if (prop === 'y1' || prop === 'y2') {
                coords[prop] += -this.offsetY + object.height / 2;
              }
            }
          }

          if (this.type === 'linear') {
            gradient = ctx.createLinearGradient(
              coords.x1, coords.y1, coords.x2, coords.y2);
          }
          else if (this.type === 'radial') {
            gradient = ctx.createRadialGradient(
              coords.x1, coords.y1, coords.r1, coords.x2, coords.y2, coords.r2);
          }

          for (var i = 0, len = this.colorStops.length; i < len; i++) {
            var color = this.colorStops[i].color,
                opacity = this.colorStops[i].opacity,
                offset = this.colorStops[i].offset;

            if (typeof opacity !== 'undefined') {
              color = new fabric.Color(color).setAlpha(opacity).toRgba();
            }
            gradient.addColorStop(parseFloat(offset), color);
          }

          return gradient;
        }
      });

      fabric.util.object.extend(fabric.Gradient, {

        /* _FROM_SVG_START_ */
        /**
         * Returns {@link fabric.Gradient} instance from an SVG element
         * @static
         * @memberOf fabric.Gradient
         * @param {SVGGradientElement} el SVG gradient element
         * @param {fabric.Object} instance
         * @return {fabric.Gradient} Gradient instance
         * @see http://www.w3.org/TR/SVG/pservers.html#LinearGradientElement
         * @see http://www.w3.org/TR/SVG/pservers.html#RadialGradientElement
         */
        fromElement: function(el, instance) {

          /**
           *  @example:
           *
           *  <linearGradient id="linearGrad1">
           *    <stop offset="0%" stop-color="white"/>
           *    <stop offset="100%" stop-color="black"/>
           *  </linearGradient>
           *
           *  OR
           *
           *  <linearGradient id="linearGrad2">
           *    <stop offset="0" style="stop-color:rgb(255,255,255)"/>
           *    <stop offset="1" style="stop-color:rgb(0,0,0)"/>
           *  </linearGradient>
           *
           *  OR
           *
           *  <radialGradient id="radialGrad1">
           *    <stop offset="0%" stop-color="white" stop-opacity="1" />
           *    <stop offset="50%" stop-color="black" stop-opacity="0.5" />
           *    <stop offset="100%" stop-color="white" stop-opacity="1" />
           *  </radialGradient>
           *
           *  OR
           *
           *  <radialGradient id="radialGrad2">
           *    <stop offset="0" stop-color="rgb(255,255,255)" />
           *    <stop offset="0.5" stop-color="rgb(0,0,0)" />
           *    <stop offset="1" stop-color="rgb(255,255,255)" />
           *  </radialGradient>
           *
           */

          var colorStopEls = el.getElementsByTagName('stop'),
              type = (el.nodeName === 'linearGradient' ? 'linear' : 'radial'),
              gradientUnits = el.getAttribute('gradientUnits') || 'objectBoundingBox',
              gradientTransform = el.getAttribute('gradientTransform'),
              colorStops = [],
              coords = { }, ellipseMatrix;

          Iif (type === 'linear') {
            coords = getLinearCoords(el);
          }
          else Eif (type === 'radial') {
            coords = getRadialCoords(el);
          }

          for (var i = colorStopEls.length; i--; ) {
            colorStops.push(getColorStop(colorStopEls[i]));
          }

          ellipseMatrix = _convertPercentUnitsToValues(instance, coords, gradientUnits);

          var gradient = new fabric.Gradient({
            type: type,
            coords: coords,
            colorStops: colorStops,
            offsetX: -instance.left,
            offsetY: -instance.top
          });

          if (gradientTransform || ellipseMatrix !== '') {
            gradient.gradientTransform = fabric.parseTransformAttribute((gradientTransform || '') + ellipseMatrix);
          }
          return gradient;
        },
        /* _FROM_SVG_END_ */

        /**
         * Returns {@link fabric.Gradient} instance from its object representation
         * @static
         * @memberOf fabric.Gradient
         * @param {Object} obj
         * @param {Object} [options] Options object
         */
        forObject: function(obj, options) {
          options || (options = { });
          _convertPercentUnitsToValues(obj, options.coords, 'userSpaceOnUse');
          return new fabric.Gradient(options);
        }
      });

      /**
       * @private
       */
      function _convertPercentUnitsToValues(object, options, gradientUnits) {
        var propValue, addFactor = 0, multFactor = 1, ellipseMatrix = '';
        for (var prop in options) {
          propValue = parseFloat(options[prop], 10);
          if (typeof options[prop] === 'string' && /^\d+%$/.test(options[prop])) {
            multFactor = 0.01;
          }
          else {
            multFactor = 1;
          }
          if (prop === 'x1' || prop === 'x2' || prop === 'r2') {
            multFactor *= gradientUnits === 'objectBoundingBox' ? object.width : 1;
            addFactor = gradientUnits === 'objectBoundingBox' ? object.left || 0 : 0;
          }
          else if (prop === 'y1' || prop === 'y2') {
            multFactor *= gradientUnits === 'objectBoundingBox' ? object.height : 1;
            addFactor = gradientUnits === 'objectBoundingBox' ? object.top || 0 : 0;
          }
          options[prop] = propValue * multFactor + addFactor;
        }
        Iif (object.type === 'ellipse' &&
            options.r2 !== null &&
            gradientUnits === 'objectBoundingBox' &&
            object.rx !== object.ry) {

          var scaleFactor = object.ry/object.rx;
          ellipseMatrix = ' scale(1, ' + scaleFactor + ')';
          if (options.y1) {
            options.y1 /= scaleFactor;
          }
          if (options.y2) {
            options.y2 /= scaleFactor;
          }
        }
        return ellipseMatrix;
      }
    })();

    /**
     * Pattern class
     * @class fabric.Pattern
     * @see {@link http://fabricjs.com/patterns|Pattern demo}
     * @see {@link http://fabricjs.com/dynamic-patterns|DynamicPattern demo}
     * @see {@link fabric.Pattern#initialize} for constructor definition
     */
    fabric.Pattern = fabric.util.createClass(/** @lends fabric.Pattern.prototype */ {

      /**
       * Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat)
       * @type String
       * @default
       */
      repeat: 'repeat',

      /**
       * Pattern horizontal offset from object's left/top corner
       * @type Number
       * @default
       */
      offsetX: 0,

      /**
       * Pattern vertical offset from object's left/top corner
       * @type Number
       * @default
       */
      offsetY: 0,

      /**
       * Constructor
       * @param {Object} [options] Options object
       * @return {fabric.Pattern} thisArg
       */
      initialize: function(options) {
        options || (options = { });

        this.id = fabric.Object.__uid++;

        Eif (options.source) {
          if (typeof options.source === 'string') {
            // function string
            Eif (typeof fabric.util.getFunctionBody(options.source) !== 'undefined') {
              this.source = new Function(fabric.util.getFunctionBody(options.source));
            }
            else {
              // img src string
              var _this = this;
              this.source = fabric.util.createImage();
              fabric.util.loadImage(options.source, function(img) {
                _this.source = img;
              });
            }
          }
          else {
            // img element
            this.source = options.source;
          }
        }
        if (options.repeat) {
          this.repeat = options.repeat;
        }
        if (options.offsetX) {
          this.offsetX = options.offsetX;
        }
        if (options.offsetY) {
          this.offsetY = options.offsetY;
        }
      },

      /**
       * Returns object representation of a pattern
       * @return {Object} Object representation of a pattern instance
       */
      toObject: function() {

        var source;

        // callback
        if (typeof this.source === 'function') {
          source = String(this.source);
        }
        // <img> element
        else Eif (typeof this.source.src === 'string') {
          source = this.source.src;
        }
        // <canvas> element
        else if (typeof this.source === 'object' && this.source.toDataURL) {
          source = this.source.toDataURL();
        }

        return {
          source: source,
          repeat: this.repeat,
          offsetX: this.offsetX,
          offsetY: this.offsetY
        };
      },

      /* _TO_SVG_START_ */
      /**
       * Returns SVG representation of a pattern
       * @param {fabric.Object} object
       * @return {String} SVG representation of a pattern
       */
      toSVG: function(object) {
        var patternSource = typeof this.source === 'function' ? this.source() : this.source,
            patternWidth = patternSource.width / object.getWidth(),
            patternHeight = patternSource.height / object.getHeight(),
            patternOffsetX = this.offsetX / object.getWidth(),
            patternOffsetY = this.offsetY / object.getHeight(),
            patternImgSrc = '';
        if (this.repeat === 'repeat-x' || this.repeat === 'no-repeat') {
          patternHeight = 1;
        }
        if (this.repeat === 'repeat-y' || this.repeat === 'no-repeat') {
          patternWidth = 1;
        }
        if (patternSource.src) {
          patternImgSrc = patternSource.src;
        }
        else if (patternSource.toDataURL) {
          patternImgSrc = patternSource.toDataURL();
        }

        return '<pattern id="SVGID_' + this.id +
                      '" x="' + patternOffsetX +
                      '" y="' + patternOffsetY +
                      '" width="' + patternWidth +
                      '" height="' + patternHeight + '">\n' +
                 '<image x="0" y="0"' +
                        ' width="' + patternSource.width +
                        '" height="' + patternSource.height +
                        '" xlink:href="' + patternImgSrc +
                 '"></image>\n' +
               '</pattern>\n';
      },
      /* _TO_SVG_END_ */

      /**
       * Returns an instance of CanvasPattern
       * @param {CanvasRenderingContext2D} ctx Context to create pattern
       * @return {CanvasPattern}
       */
      toLive: function(ctx) {
        var source = typeof this.source === 'function'
          ? this.source()
          : this.source;

        // if the image failed to load, return, and allow rest to continue loading
        if (!source) {
          return '';
        }

        // if an image
        if (typeof source.src !== 'undefined') {
          if (!source.complete) {
            return '';
          }
          if (source.naturalWidth === 0 || source.naturalHeight === 0) {
            return '';
          }
        }
        return ctx.createPattern(source, this.repeat);
      }
    });

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          toFixed = fabric.util.toFixed;

      Iif (fabric.Shadow) {
        fabric.warn('fabric.Shadow is already defined.');
        return;
      }

      /**
       * Shadow class
       * @class fabric.Shadow
       * @see {@link http://fabricjs.com/shadows|Shadow demo}
       * @see {@link fabric.Shadow#initialize} for constructor definition
       */
      fabric.Shadow = fabric.util.createClass(/** @lends fabric.Shadow.prototype */ {

        /**
         * Shadow color
         * @type String
         * @default
         */
        color: 'rgb(0,0,0)',

        /**
         * Shadow blur
         * @type Number
         */
        blur: 0,

        /**
         * Shadow horizontal offset
         * @type Number
         * @default
         */
        offsetX: 0,

        /**
         * Shadow vertical offset
         * @type Number
         * @default
         */
        offsetY: 0,

        /**
         * Whether the shadow should affect stroke operations
         * @type Boolean
         * @default
         */
        affectStroke: false,

        /**
         * Indicates whether toObject should include default values
         * @type Boolean
         * @default
         */
        includeDefaultValues: true,

        /**
         * Constructor
         * @param {Object|String} [options] Options object with any of color, blur, offsetX, offsetX properties or string (e.g. "rgba(0,0,0,0.2) 2px 2px 10px, "2px 2px 10px rgba(0,0,0,0.2)")
         * @return {fabric.Shadow} thisArg
         */
        initialize: function(options) {

          if (typeof options === 'string') {
            options = this._parseShadow(options);
          }

          for (var prop in options) {
            this[prop] = options[prop];
          }

          this.id = fabric.Object.__uid++;
        },

        /**
         * @private
         * @param {String} shadow Shadow value to parse
         * @return {Object} Shadow object with color, offsetX, offsetY and blur
         */
        _parseShadow: function(shadow) {
          var shadowStr = shadow.trim(),
              offsetsAndBlur = fabric.Shadow.reOffsetsAndBlur.exec(shadowStr) || [ ],
              color = shadowStr.replace(fabric.Shadow.reOffsetsAndBlur, '') || 'rgb(0,0,0)';

          return {
            color: color.trim(),
            offsetX: parseInt(offsetsAndBlur[1], 10) || 0,
            offsetY: parseInt(offsetsAndBlur[2], 10) || 0,
            blur: parseInt(offsetsAndBlur[3], 10) || 0
          };
        },

        /**
         * Returns a string representation of an instance
         * @see http://www.w3.org/TR/css-text-decor-3/#text-shadow
         * @return {String} Returns CSS3 text-shadow declaration
         */
        toString: function() {
          return [this.offsetX, this.offsetY, this.blur, this.color].join('px ');
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of a shadow
         * @param {fabric.Object} object
         * @return {String} SVG representation of a shadow
         */
        toSVG: function(object) {
          var fBoxX = 40, fBoxY = 40, NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,
              offset = fabric.util.rotateVector(
                { x: this.offsetX, y: this.offsetY },
                fabric.util.degreesToRadians(-object.angle)),
              BLUR_BOX = 20;

          Iif (object.width && object.height) {
            //http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion
            // we add some extra space to filter box to contain the blur ( 20 )
            fBoxX = toFixed((Math.abs(offset.x) + this.blur) / object.width, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;
            fBoxY = toFixed((Math.abs(offset.y) + this.blur) / object.height, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;
          }
          if (object.flipX) {
            offset.x *= -1;
          }
          if (object.flipY) {
            offset.y *= -1;
          }
          return (
            '<filter id="SVGID_' + this.id + '" y="-' + fBoxY + '%" height="' + (100 + 2 * fBoxY) + '%" ' +
              'x="-' + fBoxX + '%" width="' + (100 + 2 * fBoxX) + '%" ' + '>\n' +
              '\t<feGaussianBlur in="SourceAlpha" stdDeviation="' +
                toFixed(this.blur ? this.blur / 2 : 0, NUM_FRACTION_DIGITS) + '"></feGaussianBlur>\n' +
              '\t<feOffset dx="' + toFixed(offset.x, NUM_FRACTION_DIGITS) +
              '" dy="' + toFixed(offset.y, NUM_FRACTION_DIGITS) + '" result="oBlur" ></feOffset>\n' +
              '\t<feFlood flood-color="' + this.color + '"/>\n' +
              '\t<feComposite in2="oBlur" operator="in" />\n' +
              '\t<feMerge>\n' +
                '\t\t<feMergeNode></feMergeNode>\n' +
                '\t\t<feMergeNode in="SourceGraphic"></feMergeNode>\n' +
              '\t</feMerge>\n' +
            '</filter>\n');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns object representation of a shadow
         * @return {Object} Object representation of a shadow instance
         */
        toObject: function() {
          if (this.includeDefaultValues) {
            return {
              color: this.color,
              blur: this.blur,
              offsetX: this.offsetX,
              offsetY: this.offsetY,
              affectStroke: this.affectStroke
            };
          }
          var obj = { }, proto = fabric.Shadow.prototype;

          ['color', 'blur', 'offsetX', 'offsetY', 'affectStroke'].forEach(function(prop) {
            if (this[prop] !== proto[prop]) {
              obj[prop] = this[prop];
            }
          }, this);

          return obj;
        }
      });

      /**
       * Regex matching shadow offsetX, offsetY and blur (ex: "2px 2px 10px rgba(0,0,0,0.2)", "rgb(0,255,0) 2px 2px")
       * @static
       * @field
       * @memberOf fabric.Shadow
       */
      fabric.Shadow.reOffsetsAndBlur = /(?:\s|^)(-?\d+(?:px)?(?:\s?|$))?(-?\d+(?:px)?(?:\s?|$))?(\d+(?:px)?)?(?:\s?|$)(?:$|\s)/;

    })(typeof exports !== 'undefined' ? exports : this);

    (function () {

      'use strict';

      Iif (fabric.StaticCanvas) {
        fabric.warn('fabric.StaticCanvas is already defined.');
        return;
      }

      // aliases for faster resolution
      var extend = fabric.util.object.extend,
          getElementOffset = fabric.util.getElementOffset,
          removeFromArray = fabric.util.removeFromArray,
          toFixed = fabric.util.toFixed,

          CANVAS_INIT_ERROR = new Error('Could not initialize `canvas` element');

      /**
       * Static canvas class
       * @class fabric.StaticCanvas
       * @mixes fabric.Collection
       * @mixes fabric.Observable
       * @see {@link http://fabricjs.com/static_canvas|StaticCanvas demo}
       * @see {@link fabric.StaticCanvas#initialize} for constructor definition
       * @fires before:render
       * @fires after:render
       * @fires canvas:cleared
       * @fires object:added
       * @fires object:removed
       */
      fabric.StaticCanvas = fabric.util.createClass(/** @lends fabric.StaticCanvas.prototype */ {

        /**
         * Constructor
         * @param {HTMLElement | String} el &lt;canvas> element to initialize instance on
         * @param {Object} [options] Options object
         * @return {Object} thisArg
         */
        initialize: function(el, options) {
          options || (options = { });

          this._initStatic(el, options);
        },

        /**
         * Background color of canvas instance.
         * Should be set via {@link fabric.StaticCanvas#setBackgroundColor}.
         * @type {(String|fabric.Pattern)}
         * @default
         */
        backgroundColor: '',

        /**
         * Background image of canvas instance.
         * Should be set via {@link fabric.StaticCanvas#setBackgroundImage}.
         * <b>Backwards incompatibility note:</b> The "backgroundImageOpacity"
         * and "backgroundImageStretch" properties are deprecated since 1.3.9.
         * Use {@link fabric.Image#opacity}, {@link fabric.Image#width} and {@link fabric.Image#height}.
         * @type fabric.Image
         * @default
         */
        backgroundImage: null,

        /**
         * Overlay color of canvas instance.
         * Should be set via {@link fabric.StaticCanvas#setOverlayColor}
         * @since 1.3.9
         * @type {(String|fabric.Pattern)}
         * @default
         */
        overlayColor: '',

        /**
         * Overlay image of canvas instance.
         * Should be set via {@link fabric.StaticCanvas#setOverlayImage}.
         * <b>Backwards incompatibility note:</b> The "overlayImageLeft"
         * and "overlayImageTop" properties are deprecated since 1.3.9.
         * Use {@link fabric.Image#left} and {@link fabric.Image#top}.
         * @type fabric.Image
         * @default
         */
        overlayImage: null,

        /**
         * Indicates whether toObject/toDatalessObject should include default values
         * @type Boolean
         * @default
         */
        includeDefaultValues: true,

        /**
         * Indicates whether objects' state should be saved
         * @type Boolean
         * @default
         */
        stateful: true,

        /**
         * Indicates whether {@link fabric.Collection.add}, {@link fabric.Collection.insertAt} and {@link fabric.Collection.remove} should also re-render canvas.
         * Disabling this option could give a great performance boost when adding/removing a lot of objects to/from canvas at once
         * (followed by a manual rendering after addition/deletion)
         * @type Boolean
         * @default
         */
        renderOnAddRemove: true,

        /**
         * Function that determines clipping of entire canvas area
         * Being passed context as first argument. See clipping canvas area in {@link https://github.com/kangax/fabric.js/wiki/FAQ}
         * @type Function
         * @default
         */
        clipTo: null,

        /**
         * Indicates whether object controls (borders/controls) are rendered above overlay image
         * @type Boolean
         * @default
         */
        controlsAboveOverlay: false,

        /**
         * Indicates whether the browser can be scrolled when using a touchscreen and dragging on the canvas
         * @type Boolean
         * @default
         */
        allowTouchScrolling: false,

        /**
         * Indicates whether this canvas will use image smoothing, this is on by default in browsers
         * @type Boolean
         * @default
         */
        imageSmoothingEnabled: true,

        /**
         * Indicates whether objects should remain in current stack position when selected. When false objects are brought to top and rendered as part of the selection group
         * @type Boolean
         * @default
         */
        preserveObjectStacking: false,

        /**
         * The transformation (in the format of Canvas transform) which focuses the viewport
         * @type Array
         * @default
         */
        viewportTransform: [1, 0, 0, 1, 0, 0],

        /**
         * Callback; invoked right before object is about to be scaled/rotated
         */
        onBeforeScaleRotate: function () {
          /* NOOP */
        },

        /**
         * When true, canvas is scaled by devicePixelRatio for better rendering on retina screens
         */
        enableRetinaScaling: true,

        /**
         * @private
         * @param {HTMLElement | String} el &lt;canvas> element to initialize instance on
         * @param {Object} [options] Options object
         */
        _initStatic: function(el, options) {
          this._objects = [];

          this._createLowerCanvas(el);
          this._initOptions(options);
          this._setImageSmoothing();

          // only initialize retina scaling once
          if (!this.interactive) {
            this._initRetinaScaling();
          }

          Iif (options.overlayImage) {
            this.setOverlayImage(options.overlayImage, this.renderAll.bind(this));
          }
          Iif (options.backgroundImage) {
            this.setBackgroundImage(options.backgroundImage, this.renderAll.bind(this));
          }
          if (options.backgroundColor) {
            this.setBackgroundColor(options.backgroundColor, this.renderAll.bind(this));
          }
          if (options.overlayColor) {
            this.setOverlayColor(options.overlayColor, this.renderAll.bind(this));
          }
          this.calcOffset();
        },

        /**
         * @private
         */
        _isRetinaScaling: function() {
          return (fabric.devicePixelRatio !== 1 && this.enableRetinaScaling);
        },

        /**
         * @private
         */
        _initRetinaScaling: function() {
          Eif (!this._isRetinaScaling()) {
            return;
          }

          this.lowerCanvasEl.setAttribute('width', this.width * fabric.devicePixelRatio);
          this.lowerCanvasEl.setAttribute('height', this.height * fabric.devicePixelRatio);

          this.contextContainer.scale(fabric.devicePixelRatio, fabric.devicePixelRatio);
        },

        /**
         * Calculates canvas element offset relative to the document
         * This method is also attached as "resize" event handler of window
         * @return {fabric.Canvas} instance
         * @chainable
         */
        calcOffset: function () {
          this._offset = getElementOffset(this.lowerCanvasEl);
          return this;
        },

        /**
         * Sets {@link fabric.StaticCanvas#overlayImage|overlay image} for this canvas
         * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set overlay to
         * @param {Function} callback callback to invoke when image is loaded and set as an overlay
         * @param {Object} [options] Optional options to set for the {@link fabric.Image|overlay image}.
         * @return {fabric.Canvas} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/MnzHT/|jsFiddle demo}
         * @example <caption>Normal overlayImage with left/top = 0</caption>
         * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {
         *   // Needed to position overlayImage at 0/0
         *   originX: 'left',
         *   originY: 'top'
         * });
         * @example <caption>overlayImage with different properties</caption>
         * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {
         *   opacity: 0.5,
         *   angle: 45,
         *   left: 400,
         *   top: 400,
         *   originX: 'left',
         *   originY: 'top'
         * });
         * @example <caption>Stretched overlayImage #1 - width/height correspond to canvas width/height</caption>
         * fabric.Image.fromURL('http://fabricjs.com/assets/jail_cell_bars.png', function(img) {
         *    img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});
         *    canvas.setOverlayImage(img, canvas.renderAll.bind(canvas));
         * });
         * @example <caption>Stretched overlayImage #2 - width/height correspond to canvas width/height</caption>
         * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {
         *   width: canvas.width,
         *   height: canvas.height,
         *   // Needed to position overlayImage at 0/0
         *   originX: 'left',
         *   originY: 'top'
         * });
         * @example <caption>overlayImage loaded from cross-origin</caption>
         * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {
         *   opacity: 0.5,
         *   angle: 45,
         *   left: 400,
         *   top: 400,
         *   originX: 'left',
         *   originY: 'top',
         *   crossOrigin: 'anonymous'
         * });
         */
        setOverlayImage: function (image, callback, options) {
          return this.__setBgOverlayImage('overlayImage', image, callback, options);
        },

        /**
         * Sets {@link fabric.StaticCanvas#backgroundImage|background image} for this canvas
         * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set background to
         * @param {Function} callback Callback to invoke when image is loaded and set as background
         * @param {Object} [options] Optional options to set for the {@link fabric.Image|background image}.
         * @return {fabric.Canvas} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/YH9yD/|jsFiddle demo}
         * @example <caption>Normal backgroundImage with left/top = 0</caption>
         * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {
         *   // Needed to position backgroundImage at 0/0
         *   originX: 'left',
         *   originY: 'top'
         * });
         * @example <caption>backgroundImage with different properties</caption>
         * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {
         *   opacity: 0.5,
         *   angle: 45,
         *   left: 400,
         *   top: 400,
         *   originX: 'left',
         *   originY: 'top'
         * });
         * @example <caption>Stretched backgroundImage #1 - width/height correspond to canvas width/height</caption>
         * fabric.Image.fromURL('http://fabricjs.com/assets/honey_im_subtle.png', function(img) {
         *    img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});
         *    canvas.setBackgroundImage(img, canvas.renderAll.bind(canvas));
         * });
         * @example <caption>Stretched backgroundImage #2 - width/height correspond to canvas width/height</caption>
         * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {
         *   width: canvas.width,
         *   height: canvas.height,
         *   // Needed to position backgroundImage at 0/0
         *   originX: 'left',
         *   originY: 'top'
         * });
         * @example <caption>backgroundImage loaded from cross-origin</caption>
         * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {
         *   opacity: 0.5,
         *   angle: 45,
         *   left: 400,
         *   top: 400,
         *   originX: 'left',
         *   originY: 'top',
         *   crossOrigin: 'anonymous'
         * });
         */
        setBackgroundImage: function (image, callback, options) {
          return this.__setBgOverlayImage('backgroundImage', image, callback, options);
        },

        /**
         * Sets {@link fabric.StaticCanvas#overlayColor|background color} for this canvas
         * @param {(String|fabric.Pattern)} overlayColor Color or pattern to set background color to
         * @param {Function} callback Callback to invoke when background color is set
         * @return {fabric.Canvas} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/pB55h/|jsFiddle demo}
         * @example <caption>Normal overlayColor - color value</caption>
         * canvas.setOverlayColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));
         * @example <caption>fabric.Pattern used as overlayColor</caption>
         * canvas.setOverlayColor({
         *   source: 'http://fabricjs.com/assets/escheresque_ste.png'
         * }, canvas.renderAll.bind(canvas));
         * @example <caption>fabric.Pattern used as overlayColor with repeat and offset</caption>
         * canvas.setOverlayColor({
         *   source: 'http://fabricjs.com/assets/escheresque_ste.png',
         *   repeat: 'repeat',
         *   offsetX: 200,
         *   offsetY: 100
         * }, canvas.renderAll.bind(canvas));
         */
        setOverlayColor: function(overlayColor, callback) {
          return this.__setBgOverlayColor('overlayColor', overlayColor, callback);
        },

        /**
         * Sets {@link fabric.StaticCanvas#backgroundColor|background color} for this canvas
         * @param {(String|fabric.Pattern)} backgroundColor Color or pattern to set background color to
         * @param {Function} callback Callback to invoke when background color is set
         * @return {fabric.Canvas} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/hXzvk/|jsFiddle demo}
         * @example <caption>Normal backgroundColor - color value</caption>
         * canvas.setBackgroundColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));
         * @example <caption>fabric.Pattern used as backgroundColor</caption>
         * canvas.setBackgroundColor({
         *   source: 'http://fabricjs.com/assets/escheresque_ste.png'
         * }, canvas.renderAll.bind(canvas));
         * @example <caption>fabric.Pattern used as backgroundColor with repeat and offset</caption>
         * canvas.setBackgroundColor({
         *   source: 'http://fabricjs.com/assets/escheresque_ste.png',
         *   repeat: 'repeat',
         *   offsetX: 200,
         *   offsetY: 100
         * }, canvas.renderAll.bind(canvas));
         */
        setBackgroundColor: function(backgroundColor, callback) {
          return this.__setBgOverlayColor('backgroundColor', backgroundColor, callback);
        },

        /**
         * @private
         * @see {@link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-context-2d-imagesmoothingenabled|WhatWG Canvas Standard}
         */
        _setImageSmoothing: function() {
          var ctx = this.getContext();

          ctx.imageSmoothingEnabled = ctx.imageSmoothingEnabled || ctx.webkitImageSmoothingEnabled
            || ctx.mozImageSmoothingEnabled || ctx.msImageSmoothingEnabled || ctx.oImageSmoothingEnabled;
          ctx.imageSmoothingEnabled = this.imageSmoothingEnabled;
        },

        /**
         * @private
         * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundImage|backgroundImage}
         * or {@link fabric.StaticCanvas#overlayImage|overlayImage})
         * @param {(fabric.Image|String|null)} image fabric.Image instance, URL of an image or null to set background or overlay to
         * @param {Function} callback Callback to invoke when image is loaded and set as background or overlay
         * @param {Object} [options] Optional options to set for the {@link fabric.Image|image}.
         */
        __setBgOverlayImage: function(property, image, callback, options) {
          if (typeof image === 'string') {
            fabric.util.loadImage(image, function(img) {
              this[property] = new fabric.Image(img, options);
              callback && callback(img);
            }, this, options && options.crossOrigin);
          }
          else {
            options && image.setOptions(options);
            this[property] = image;
            callback && callback(image);
          }

          return this;
        },

        /**
         * @private
         * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundColor|backgroundColor}
         * or {@link fabric.StaticCanvas#overlayColor|overlayColor})
         * @param {(Object|String|null)} color Object with pattern information, color value or null
         * @param {Function} [callback] Callback is invoked when color is set
         */
        __setBgOverlayColor: function(property, color, callback) {
          Iif (color && color.source) {
            var _this = this;
            fabric.util.loadImage(color.source, function(img) {
              _this[property] = new fabric.Pattern({
                source: img,
                repeat: color.repeat,
                offsetX: color.offsetX,
                offsetY: color.offsetY
              });
              callback && callback();
            });
          }
          else {
            this[property] = color;
            callback && callback();
          }

          return this;
        },

        /**
         * @private
         */
        _createCanvasElement: function() {
          var element = fabric.document.createElement('canvas');
          Iif (!element.style) {
            element.style = { };
          }
          Iif (!element) {
            throw CANVAS_INIT_ERROR;
          }
          this._initCanvasElement(element);
          return element;
        },

        /**
         * @private
         * @param {HTMLElement} element
         */
        _initCanvasElement: function(element) {
          fabric.util.createCanvasElement(element);

          Iif (typeof element.getContext === 'undefined') {
            throw CANVAS_INIT_ERROR;
          }
        },

        /**
         * @private
         * @param {Object} [options] Options object
         */
        _initOptions: function (options) {
          for (var prop in options) {
            this[prop] = options[prop];
          }

          this.width = this.width || parseInt(this.lowerCanvasEl.width, 10) || 0;
          this.height = this.height || parseInt(this.lowerCanvasEl.height, 10) || 0;

          Iif (!this.lowerCanvasEl.style) {
            return;
          }

          this.lowerCanvasEl.width = this.width;
          this.lowerCanvasEl.height = this.height;

          this.lowerCanvasEl.style.width = this.width + 'px';
          this.lowerCanvasEl.style.height = this.height + 'px';

          this.viewportTransform = this.viewportTransform.slice();
        },

        /**
         * Creates a bottom canvas
         * @private
         * @param {HTMLElement} [canvasEl]
         */
        _createLowerCanvas: function (canvasEl) {
          this.lowerCanvasEl = fabric.util.getById(canvasEl) || this._createCanvasElement();
          this._initCanvasElement(this.lowerCanvasEl);

          fabric.util.addClass(this.lowerCanvasEl, 'lower-canvas');

          if (this.interactive) {
            this._applyCanvasStyle(this.lowerCanvasEl);
          }

          this.contextContainer = this.lowerCanvasEl.getContext('2d');
        },

        /**
         * Returns canvas width (in px)
         * @return {Number}
         */
        getWidth: function () {
          return this.width;
        },

        /**
         * Returns canvas height (in px)
         * @return {Number}
         */
        getHeight: function () {
          return this.height;
        },

        /**
         * Sets width of this canvas instance
         * @param {Number|String} value                         Value to set width to
         * @param {Object}        [options]                     Options object
         * @param {Boolean}       [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions
         * @param {Boolean}       [options.cssOnly=false]       Set the given dimensions only as css dimensions
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        setWidth: function (value, options) {
          return this.setDimensions({ width: value }, options);
        },

        /**
         * Sets height of this canvas instance
         * @param {Number|String} value                         Value to set height to
         * @param {Object}        [options]                     Options object
         * @param {Boolean}       [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions
         * @param {Boolean}       [options.cssOnly=false]       Set the given dimensions only as css dimensions
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        setHeight: function (value, options) {
          return this.setDimensions({ height: value }, options);
        },

        /**
         * Sets dimensions (width, height) of this canvas instance. when options.cssOnly flag active you should also supply the unit of measure (px/%/em)
         * @param {Object}        dimensions                    Object with width/height properties
         * @param {Number|String} [dimensions.width]            Width of canvas element
         * @param {Number|String} [dimensions.height]           Height of canvas element
         * @param {Object}        [options]                     Options object
         * @param {Boolean}       [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions
         * @param {Boolean}       [options.cssOnly=false]       Set the given dimensions only as css dimensions
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        setDimensions: function (dimensions, options) {
          var cssValue;

          options = options || {};

          for (var prop in dimensions) {
            cssValue = dimensions[prop];

            if (!options.cssOnly) {
              this._setBackstoreDimension(prop, dimensions[prop]);
              cssValue += 'px';
            }

            if (!options.backstoreOnly) {
              this._setCssDimension(prop, cssValue);
            }
          }
          this._initRetinaScaling();
          this._setImageSmoothing();
          this.calcOffset();

          if (!options.cssOnly) {
            this.renderAll();
          }

          return this;
        },

        /**
         * Helper for setting width/height
         * @private
         * @param {String} prop property (width|height)
         * @param {Number} value value to set property to
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        _setBackstoreDimension: function (prop, value) {
          this.lowerCanvasEl[prop] = value;

          if (this.upperCanvasEl) {
            this.upperCanvasEl[prop] = value;
          }

          if (this.cacheCanvasEl) {
            this.cacheCanvasEl[prop] = value;
          }

          this[prop] = value;

          return this;
        },

        /**
         * Helper for setting css width/height
         * @private
         * @param {String} prop property (width|height)
         * @param {String} value value to set property to
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        _setCssDimension: function (prop, value) {
          this.lowerCanvasEl.style[prop] = value;

          if (this.upperCanvasEl) {
            this.upperCanvasEl.style[prop] = value;
          }

          if (this.wrapperEl) {
            this.wrapperEl.style[prop] = value;
          }

          return this;
        },

        /**
         * Returns canvas zoom level
         * @return {Number}
         */
        getZoom: function () {
          return Math.sqrt(this.viewportTransform[0] * this.viewportTransform[3]);
        },

        /**
         * Sets viewport transform of this canvas instance
         * @param {Array} vpt the transform in the form of context.transform
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        setViewportTransform: function (vpt) {
          var activeGroup = this.getActiveGroup();
          this.viewportTransform = vpt;
          this.renderAll();
          for (var i = 0, len = this._objects.length; i < len; i++) {
            this._objects[i].setCoords();
          }
          if (activeGroup) {
            activeGroup.setCoords();
          }
          return this;
        },

        /**
         * Sets zoom level of this canvas instance, zoom centered around point
         * @param {fabric.Point} point to zoom with respect to
         * @param {Number} value to set zoom to, less than 1 zooms out
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        zoomToPoint: function (point, value) {
          // TODO: just change the scale, preserve other transformations
          var before = point;
          point = fabric.util.transformPoint(point, fabric.util.invertTransform(this.viewportTransform));
          this.viewportTransform[0] = value;
          this.viewportTransform[3] = value;
          var after = fabric.util.transformPoint(point, this.viewportTransform);
          this.viewportTransform[4] += before.x - after.x;
          this.viewportTransform[5] += before.y - after.y;
          this.renderAll();
          for (var i = 0, len = this._objects.length; i < len; i++) {
            this._objects[i].setCoords();
          }
          return this;
        },

        /**
         * Sets zoom level of this canvas instance
         * @param {Number} value to set zoom to, less than 1 zooms out
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        setZoom: function (value) {
          this.zoomToPoint(new fabric.Point(0, 0), value);
          return this;
        },

        /**
         * Pan viewport so as to place point at top left corner of canvas
         * @param {fabric.Point} point to move to
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        absolutePan: function (point) {
          this.viewportTransform[4] = -point.x;
          this.viewportTransform[5] = -point.y;
          this.renderAll();
          for (var i = 0, len = this._objects.length; i < len; i++) {
            this._objects[i].setCoords();
          }
          return this;
        },

        /**
         * Pans viewpoint relatively
         * @param {fabric.Point} point (position vector) to move by
         * @return {fabric.Canvas} instance
         * @chainable true
         */
        relativePan: function (point) {
          return this.absolutePan(new fabric.Point(
            -point.x - this.viewportTransform[4],
            -point.y - this.viewportTransform[5]
          ));
        },

        /**
         * Returns &lt;canvas> element corresponding to this instance
         * @return {HTMLCanvasElement}
         */
        getElement: function () {
          return this.lowerCanvasEl;
        },

        /**
         * Returns currently selected object, if any
         * @return {fabric.Object}
         */
        getActiveObject: function() {
          return null;
        },

        /**
         * Returns currently selected group of object, if any
         * @return {fabric.Group}
         */
        getActiveGroup: function() {
          return null;
        },

        /**
         * @private
         * @param {fabric.Object} obj Object that was added
         */
        _onObjectAdded: function(obj) {
          this.stateful && obj.setupState();
          obj._set('canvas', this);
          obj.setCoords();
          this.fire('object:added', { target: obj });
          obj.fire('added');
        },

        /**
         * @private
         * @param {fabric.Object} obj Object that was removed
         */
        _onObjectRemoved: function(obj) {
          // removing active object should fire "selection:cleared" events
          if (this.getActiveObject() === obj) {
            this.fire('before:selection:cleared', { target: obj });
            this._discardActiveObject();
            this.fire('selection:cleared');
          }

          this.fire('object:removed', { target: obj });
          obj.fire('removed');
        },

        /**
         * Clears specified context of canvas element
         * @param {CanvasRenderingContext2D} ctx Context to clear
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        clearContext: function(ctx) {
          ctx.clearRect(0, 0, this.width, this.height);
          return this;
        },

        /**
         * Returns context of canvas where objects are drawn
         * @return {CanvasRenderingContext2D}
         */
        getContext: function () {
          return this.contextContainer;
        },

        /**
         * Clears all contexts (background, main, top) of an instance
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        clear: function () {
          this._objects.length = 0;
          if (this.discardActiveGroup) {
            this.discardActiveGroup();
          }
          if (this.discardActiveObject) {
            this.discardActiveObject();
          }
          this.clearContext(this.contextContainer);
          if (this.contextTop) {
            this.clearContext(this.contextTop);
          }
          this.fire('canvas:cleared');
          this.renderAll();
          return this;
        },

        /**
         * Divides objects in two groups, one to render immediately
         * and one to render as activeGroup.
         * return objects to render immediately and pushes the other in the activeGroup.
         */
        _chooseObjectsToRender: function() {
          var activeGroup = this.getActiveGroup(),
              object, objsToRender = [ ], activeGroupObjects = [ ];

          if (activeGroup && !this.preserveObjectStacking) {
            for (var i = 0, length = this._objects.length; i < length; i++) {
              object = this._objects[i];
              if (!activeGroup.contains(object)) {
                objsToRender.push(object);
              }
              else {
                activeGroupObjects.push(object);
              }
            }
            activeGroup._set('_objects', activeGroupObjects);
          }
          else {
            objsToRender = this._objects;
          }
          return objsToRender;
        },

        /**
         * Renders both the top canvas and the secondary container canvas.
         * @param {Boolean} [allOnTop] Whether we want to force all images to be rendered on the top canvas
         * @return {fabric.Canvas} instance
         * @chainable
         */
        renderAll: function () {
          var canvasToDrawOn = this.contextContainer, objsToRender;

          if (this.contextTop && this.selection && !this._groupSelector && !this.isDrawingMode) {
            this.clearContext(this.contextTop);
          }

          this.clearContext(canvasToDrawOn);

          this.fire('before:render');

          if (this.clipTo) {
            fabric.util.clipContext(this, canvasToDrawOn);
          }
          this._renderBackground(canvasToDrawOn);

          canvasToDrawOn.save();
          objsToRender = this._chooseObjectsToRender();
          //apply viewport transform once for all rendering process
          canvasToDrawOn.transform.apply(canvasToDrawOn, this.viewportTransform);
          this._renderObjects(canvasToDrawOn, objsToRender);
          this.preserveObjectStacking || this._renderObjects(canvasToDrawOn, [this.getActiveGroup()]);
          canvasToDrawOn.restore();

          if (!this.controlsAboveOverlay && this.interactive) {
            this.drawControls(canvasToDrawOn);
          }
          if (this.clipTo) {
            canvasToDrawOn.restore();
          }
          this._renderOverlay(canvasToDrawOn);
          Iif (this.controlsAboveOverlay && this.interactive) {
            this.drawControls(canvasToDrawOn);
          }

          this.fire('after:render');
          return this;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Array} objects to render
         */
        _renderObjects: function(ctx, objects) {
          for (var i = 0, length = objects.length; i < length; ++i) {
            objects[i] && objects[i].render(ctx);
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {string} property 'background' or 'overlay'
         */
        _renderBackgroundOrOverlay: function(ctx, property) {
          var object = this[property + 'Color'];
          if (object) {
            ctx.fillStyle = object.toLive
              ? object.toLive(ctx)
              : object;

            ctx.fillRect(
              object.offsetX || 0,
              object.offsetY || 0,
              this.width,
              this.height);
          }
          object = this[property + 'Image'];
          if (object) {
            object.render(ctx);
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderBackground: function(ctx) {
          this._renderBackgroundOrOverlay(ctx, 'background');
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderOverlay: function(ctx) {
          this._renderBackgroundOrOverlay(ctx, 'overlay');
        },

        /**
         * Method to render only the top canvas.
         * Also used to render the group selection box.
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        renderTop: function () {
          var ctx = this.contextTop || this.contextContainer;
          this.clearContext(ctx);

          // we render the top context - last object
          Iif (this.selection && this._groupSelector) {
            this._drawSelection();
          }

          this.fire('after:render');

          return this;
        },

        /**
         * Returns coordinates of a center of canvas.
         * Returned value is an object with top and left properties
         * @return {Object} object with "top" and "left" number values
         */
        getCenter: function () {
          return {
            top: this.getHeight() / 2,
            left: this.getWidth() / 2
          };
        },

        /**
         * Centers object horizontally.
         * You might need to call `setCoords` on an object after centering, to update controls area.
         * @param {fabric.Object} object Object to center horizontally
         * @return {fabric.Canvas} thisArg
         */
        centerObjectH: function (object) {
          this._centerObject(object, new fabric.Point(this.getCenter().left, object.getCenterPoint().y));
          this.renderAll();
          return this;
        },

        /**
         * Centers object vertically.
         * You might need to call `setCoords` on an object after centering, to update controls area.
         * @param {fabric.Object} object Object to center vertically
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        centerObjectV: function (object) {
          this._centerObject(object, new fabric.Point(object.getCenterPoint().x, this.getCenter().top));
          this.renderAll();
          return this;
        },

        /**
         * Centers object vertically and horizontally.
         * You might need to call `setCoords` on an object after centering, to update controls area.
         * @param {fabric.Object} object Object to center vertically and horizontally
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        centerObject: function(object) {
          var center = this.getCenter();

          this._centerObject(object, new fabric.Point(center.left, center.top));
          this.renderAll();
          return this;
        },

        /**
         * @private
         * @param {fabric.Object} object Object to center
         * @param {fabric.Point} center Center point
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        _centerObject: function(object, center) {
          object.setPositionByOrigin(center, 'center', 'center');
          return this;
        },

        /**
         * Returs dataless JSON representation of canvas
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {String} json string
         */
        toDatalessJSON: function (propertiesToInclude) {
          return this.toDatalessObject(propertiesToInclude);
        },

        /**
         * Returns object representation of canvas
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function (propertiesToInclude) {
          return this._toObjectMethod('toObject', propertiesToInclude);
        },

        /**
         * Returns dataless object representation of canvas
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toDatalessObject: function (propertiesToInclude) {
          return this._toObjectMethod('toDatalessObject', propertiesToInclude);
        },

        /**
         * @private
         */
        _toObjectMethod: function (methodName, propertiesToInclude) {

          var data = {
            objects: this._toObjects(methodName, propertiesToInclude)
          };

          extend(data, this.__serializeBgOverlay());

          fabric.util.populateWithProperties(this, data, propertiesToInclude);

          return data;
        },

        /**
         * @private
         */
        _toObjects: function(methodName, propertiesToInclude) {
          return this.getObjects().map(function(instance) {
            return this._toObject(instance, methodName, propertiesToInclude);
          }, this);
        },

        /**
         * @private
         */
        _toObject: function(instance, methodName, propertiesToInclude) {
          var originalValue;

          Iif (!this.includeDefaultValues) {
            originalValue = instance.includeDefaultValues;
            instance.includeDefaultValues = false;
          }

          //If the object is part of the current selection group, it should
          //be transformed appropriately
          //i.e. it should be serialised as it would appear if the selection group
          //were to be destroyed.
          var originalProperties = this._realizeGroupTransformOnObject(instance),
              object = instance[methodName](propertiesToInclude);
          Iif (!this.includeDefaultValues) {
            instance.includeDefaultValues = originalValue;
          }

          //Undo the damage we did by changing all of its properties
          this._unwindGroupTransformOnObject(instance, originalProperties);

          return object;
        },

        /**
         * Realises an object's group transformation on it
         * @private
         * @param {fabric.Object} [instance] the object to transform (gets mutated)
         * @returns the original values of instance which were changed
         */
        _realizeGroupTransformOnObject: function(instance) {
          var layoutProps = ['angle', 'flipX', 'flipY', 'height', 'left', 'scaleX', 'scaleY', 'top', 'width'];
          if (instance.group && instance.group === this.getActiveGroup()) {
            //Copy all the positionally relevant properties across now
            var originalValues = {};
            layoutProps.forEach(function(prop) {
              originalValues[prop] = instance[prop];
            });
            this.getActiveGroup().realizeTransform(instance);
            return originalValues;
          }
          else {
            return null;
          }
        },

        /**
         * Restores the changed properties of instance
         * @private
         * @param {fabric.Object} [instance] the object to un-transform (gets mutated)
         * @param {Object} [originalValues] the original values of instance, as returned by _realizeGroupTransformOnObject
         */
        _unwindGroupTransformOnObject: function(instance, originalValues) {
          if (originalValues) {
            instance.set(originalValues);
          }
        },

        /**
         * @private
         */
        __serializeBgOverlay: function() {
          var data = {
            background: (this.backgroundColor && this.backgroundColor.toObject)
              ? this.backgroundColor.toObject()
              : this.backgroundColor
          };

          if (this.overlayColor) {
            data.overlay = this.overlayColor.toObject
              ? this.overlayColor.toObject()
              : this.overlayColor;
          }
          if (this.backgroundImage) {
            data.backgroundImage = this.backgroundImage.toObject();
          }
          if (this.overlayImage) {
            data.overlayImage = this.overlayImage.toObject();
          }

          return data;
        },

        /* _TO_SVG_START_ */
        /**
         * When true, getSvgTransform() will apply the StaticCanvas.viewportTransform to the SVG transformation. When true,
         * a zoomed canvas will then produce zoomed SVG output.
         * @type Boolean
         * @default
         */
        svgViewportTransformation: true,

        /**
         * Returns SVG representation of canvas
         * @function
         * @param {Object} [options] Options object for SVG output
         * @param {Boolean} [options.suppressPreamble=false] If true xml tag is not included
         * @param {Object} [options.viewBox] SVG viewbox object
         * @param {Number} [options.viewBox.x] x-cooridnate of viewbox
         * @param {Number} [options.viewBox.y] y-coordinate of viewbox
         * @param {Number} [options.viewBox.width] Width of viewbox
         * @param {Number} [options.viewBox.height] Height of viewbox
         * @param {String} [options.encoding=UTF-8] Encoding of SVG output
         * @param {String} [options.width] desired width of svg with or without units
         * @param {String} [options.height] desired height of svg with or without units
         * @param {Function} [reviver] Method for further parsing of svg elements, called after each fabric object converted into svg representation.
         * @return {String} SVG string
         * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}
         * @see {@link http://jsfiddle.net/fabricjs/jQ3ZZ/|jsFiddle demo}
         * @example <caption>Normal SVG output</caption>
         * var svg = canvas.toSVG();
         * @example <caption>SVG output without preamble (without &lt;?xml ../>)</caption>
         * var svg = canvas.toSVG({suppressPreamble: true});
         * @example <caption>SVG output with viewBox attribute</caption>
         * var svg = canvas.toSVG({
         *   viewBox: {
         *     x: 100,
         *     y: 100,
         *     width: 200,
         *     height: 300
         *   }
         * });
         * @example <caption>SVG output with different encoding (default: UTF-8)</caption>
         * var svg = canvas.toSVG({encoding: 'ISO-8859-1'});
         * @example <caption>Modify SVG output with reviver function</caption>
         * var svg = canvas.toSVG(null, function(svg) {
         *   return svg.replace('stroke-dasharray: ; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 10; ', '');
         * });
         */
        toSVG: function(options, reviver) {
          options || (options = { });

          var markup = [];

          this._setSVGPreamble(markup, options);
          this._setSVGHeader(markup, options);

          this._setSVGBgOverlayColor(markup, 'backgroundColor');
          this._setSVGBgOverlayImage(markup, 'backgroundImage');

          this._setSVGObjects(markup, reviver);

          this._setSVGBgOverlayColor(markup, 'overlayColor');
          this._setSVGBgOverlayImage(markup, 'overlayImage');

          markup.push('</svg>');

          return markup.join('');
        },

        /**
         * @private
         */
        _setSVGPreamble: function(markup, options) {
          if (options.suppressPreamble) {
            return;
          }
          markup.push(
            '<?xml version="1.0" encoding="', (options.encoding || 'UTF-8'), '" standalone="no" ?>\n',
              '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" ',
                '"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n'
          );
        },

        /**
         * @private
         */
        _setSVGHeader: function(markup, options) {
          var width = options.width || this.width,
              height = options.height || this.height,
              vpt, viewBox = 'viewBox="0 0 ' + this.width + ' ' + this.height + '" ',
              NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;

          if (options.viewBox) {
            viewBox = 'viewBox="' +
                    options.viewBox.x + ' ' +
                    options.viewBox.y + ' ' +
                    options.viewBox.width + ' ' +
                    options.viewBox.height + '" ';
          }
          else {
            Eif (this.svgViewportTransformation) {
              vpt = this.viewportTransform;
              viewBox = 'viewBox="' +
                      toFixed(-vpt[4] / vpt[0], NUM_FRACTION_DIGITS) + ' ' +
                      toFixed(-vpt[5] / vpt[3], NUM_FRACTION_DIGITS) + ' ' +
                      toFixed(this.width / vpt[0], NUM_FRACTION_DIGITS) + ' ' +
                      toFixed(this.height / vpt[3], NUM_FRACTION_DIGITS) + '" ';
            }
          }

          markup.push(
            '<svg ',
              'xmlns="http://www.w3.org/2000/svg" ',
              'xmlns:xlink="http://www.w3.org/1999/xlink" ',
              'version="1.1" ',
              'width="', width, '" ',
              'height="', height, '" ',
              (this.backgroundColor && !this.backgroundColor.toLive
                ? 'style="background-color: ' + this.backgroundColor + '" '
                : null),
              viewBox,
              'xml:space="preserve">\n',
            '<desc>Created with Fabric.js ', fabric.version, '</desc>\n',
            '<defs>',
              fabric.createSVGFontFacesMarkup(this.getObjects()),
              fabric.createSVGRefElementsMarkup(this),
            '</defs>\n'
          );
        },

        /**
         * @private
         */
        _setSVGObjects: function(markup, reviver) {
          for (var i = 0, objects = this.getObjects(), len = objects.length; i < len; i++) {
            var instance = objects[i],
                //If the object is in a selection group, simulate what would happen to that
                //object when the group is deselected
                originalProperties = this._realizeGroupTransformOnObject(instance);
            markup.push(instance.toSVG(reviver));
            this._unwindGroupTransformOnObject(instance, originalProperties);
          }
        },

        /**
         * @private
         */
        _setSVGBgOverlayImage: function(markup, property) {
          Iif (this[property] && this[property].toSVG) {
            markup.push(this[property].toSVG());
          }
        },

        /**
         * @private
         */
        _setSVGBgOverlayColor: function(markup, property) {
          Iif (this[property] && this[property].source) {
            markup.push(
              '<rect x="', this[property].offsetX, '" y="', this[property].offsetY, '" ',
                'width="',
                  (this[property].repeat === 'repeat-y' || this[property].repeat === 'no-repeat'
                    ? this[property].source.width
                    : this.width),
                '" height="',
                  (this[property].repeat === 'repeat-x' || this[property].repeat === 'no-repeat'
                    ? this[property].source.height
                    : this.height),
                '" fill="url(#' + property + 'Pattern)"',
              '></rect>\n'
            );
          }
          else Iif (this[property] && property === 'overlayColor') {
            markup.push(
              '<rect x="0" y="0" ',
                'width="', this.width,
                '" height="', this.height,
                '" fill="', this[property], '"',
              '></rect>\n'
            );
          }
        },
        /* _TO_SVG_END_ */

        /**
         * Moves an object or the objects of a multiple selection
         * to the bottom of the stack of drawn objects
         * @param {fabric.Object} object Object to send to back
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        sendToBack: function (object) {
          Iif (!object) {
            return this;
          }
          var activeGroup = this.getActiveGroup ? this.getActiveGroup() : null,
              i, obj, objs;
          if (object === activeGroup) {
            objs = activeGroup._objects;
            for (i = objs.length; i--;) {
              obj = objs[i];
              removeFromArray(this._objects, obj);
              this._objects.unshift(obj);
            }
          }
          else {
            removeFromArray(this._objects, object);
            this._objects.unshift(object);
          }
          return this.renderAll && this.renderAll();
        },

        /**
         * Moves an object or the objects of a multiple selection
         * to the top of the stack of drawn objects
         * @param {fabric.Object} object Object to send
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        bringToFront: function (object) {
          Iif (!object) {
            return this;
          }
          var activeGroup = this.getActiveGroup ? this.getActiveGroup() : null,
              i, obj, objs;
          if (object === activeGroup) {
            objs = activeGroup._objects;
            for (i = 0; i < objs.length; i++) {
              obj = objs[i];
              removeFromArray(this._objects, obj);
              this._objects.push(obj);
            }
          }
          else {
            removeFromArray(this._objects, object);
            this._objects.push(object);
          }
          return this.renderAll && this.renderAll();
        },

        /**
         * Moves an object or a selection down in stack of drawn objects
         * @param {fabric.Object} object Object to send
         * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        sendBackwards: function (object, intersecting) {
          Iif (!object) {
            return this;
          }
          var activeGroup = this.getActiveGroup ? this.getActiveGroup() : null,
              i, obj, idx, newIdx, objs;

          if (object === activeGroup) {
            objs = activeGroup._objects;
            for (i = 0; i < objs.length; i++) {
              obj = objs[i];
              idx = this._objects.indexOf(obj);
              Eif (idx !== 0) {
                newIdx = idx - 1;
                removeFromArray(this._objects, obj);
                this._objects.splice(newIdx, 0, obj);
              }
            }
          }
          else {
            idx = this._objects.indexOf(object);
            if (idx !== 0) {
              // if object is not on the bottom of stack
              newIdx = this._findNewLowerIndex(object, idx, intersecting);
              removeFromArray(this._objects, object);
              this._objects.splice(newIdx, 0, object);
            }
          }
          this.renderAll && this.renderAll();
          return this;
        },

        /**
         * @private
         */
        _findNewLowerIndex: function(object, idx, intersecting) {
          var newIdx;

          Iif (intersecting) {
            newIdx = idx;

            // traverse down the stack looking for the nearest intersecting object
            for (var i = idx - 1; i >= 0; --i) {

              var isIntersecting = object.intersectsWithObject(this._objects[i]) ||
                                   object.isContainedWithinObject(this._objects[i]) ||
                                   this._objects[i].isContainedWithinObject(object);

              if (isIntersecting) {
                newIdx = i;
                break;
              }
            }
          }
          else {
            newIdx = idx - 1;
          }

          return newIdx;
        },

        /**
         * Moves an object or a selection up in stack of drawn objects
         * @param {fabric.Object} object Object to send
         * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        bringForward: function (object, intersecting) {
          Iif (!object) {
            return this;
          }
          var activeGroup = this.getActiveGroup ? this.getActiveGroup() : null,
              i, obj, idx, newIdx, objs;

          if (object === activeGroup) {
            objs = activeGroup._objects;
            for (i = objs.length; i--;) {
              obj = objs[i];
              idx = this._objects.indexOf(obj);
              Eif (idx !== this._objects.length - 1) {
                newIdx = idx + 1;
                removeFromArray(this._objects, obj);
                this._objects.splice(newIdx, 0, obj);
              }
            }
          }
          else {
            idx = this._objects.indexOf(object);
            if (idx !== this._objects.length - 1) {
              // if object is not on top of stack (last item in an array)
              newIdx = this._findNewUpperIndex(object, idx, intersecting);
              removeFromArray(this._objects, object);
              this._objects.splice(newIdx, 0, object);
            }
          }
          this.renderAll && this.renderAll();
          return this;
        },

        /**
         * @private
         */
        _findNewUpperIndex: function(object, idx, intersecting) {
          var newIdx;

          Iif (intersecting) {
            newIdx = idx;

            // traverse up the stack looking for the nearest intersecting object
            for (var i = idx + 1; i < this._objects.length; ++i) {

              var isIntersecting = object.intersectsWithObject(this._objects[i]) ||
                                   object.isContainedWithinObject(this._objects[i]) ||
                                   this._objects[i].isContainedWithinObject(object);

              if (isIntersecting) {
                newIdx = i;
                break;
              }
            }
          }
          else {
            newIdx = idx + 1;
          }

          return newIdx;
        },

        /**
         * Moves an object to specified level in stack of drawn objects
         * @param {fabric.Object} object Object to send
         * @param {Number} index Position to move to
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        moveTo: function (object, index) {
          removeFromArray(this._objects, object);
          this._objects.splice(index, 0, object);
          return this.renderAll && this.renderAll();
        },

        /**
         * Clears a canvas element and removes all event listeners
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        dispose: function () {
          this.clear();
          return this;
        },

        /**
         * Returns a string representation of an instance
         * @return {String} string representation of an instance
         */
        toString: function () {
          return '#<fabric.Canvas (' + this.complexity() + '): ' +
                   '{ objects: ' + this.getObjects().length + ' }>';
        }
      });

      extend(fabric.StaticCanvas.prototype, fabric.Observable);
      extend(fabric.StaticCanvas.prototype, fabric.Collection);
      extend(fabric.StaticCanvas.prototype, fabric.DataURLExporter);

      extend(fabric.StaticCanvas, /** @lends fabric.StaticCanvas */ {

        /**
         * @static
         * @type String
         * @default
         */
        EMPTY_JSON: '{"objects": [], "background": "white"}',

        /**
         * Provides a way to check support of some of the canvas methods
         * (either those of HTMLCanvasElement itself, or rendering context)
         *
         * @param {String} methodName Method to check support for;
         *                            Could be one of "getImageData", "toDataURL", "toDataURLWithQuality" or "setLineDash"
         * @return {Boolean | null} `true` if method is supported (or at least exists),
         *                          `null` if canvas element or context can not be initialized
         */
        supports: function (methodName) {
          var el = fabric.util.createCanvasElement();

          Iif (!el || !el.getContext) {
            return null;
          }

          var ctx = el.getContext('2d');
          Iif (!ctx) {
            return null;
          }

          switch (methodName) {

            case 'getImageData':
              return typeof ctx.getImageData !== 'undefined';

            case 'setLineDash':
              return typeof ctx.setLineDash !== 'undefined';

            case 'toDataURL':
              return typeof el.toDataURL !== 'undefined';

            case 'toDataURLWithQuality':
              try {
                el.toDataURL('image/jpeg', 0);
                return true;
              }
              catch (e) { }
              return false;

            default:
              return null;
          }
        }
      });

      /**
       * Returns JSON representation of canvas
       * @function
       * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
       * @return {String} JSON string
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}
       * @see {@link http://jsfiddle.net/fabricjs/pec86/|jsFiddle demo}
       * @example <caption>JSON without additional properties</caption>
       * var json = canvas.toJSON();
       * @example <caption>JSON with additional properties included</caption>
       * var json = canvas.toJSON(['lockMovementX', 'lockMovementY', 'lockRotation', 'lockScalingX', 'lockScalingY', 'lockUniScaling']);
       * @example <caption>JSON without default values</caption>
       * canvas.includeDefaultValues = false;
       * var json = canvas.toJSON();
       */
      fabric.StaticCanvas.prototype.toJSON = fabric.StaticCanvas.prototype.toObject;

    })();

    /**
     * BaseBrush class
     * @class fabric.BaseBrush
     * @see {@link http://fabricjs.com/freedrawing|Freedrawing demo}
     */
    fabric.BaseBrush = fabric.util.createClass(/** @lends fabric.BaseBrush.prototype */ {

      /**
       * Color of a brush
       * @type String
       * @default
       */
      color:            'rgb(0, 0, 0)',

      /**
       * Width of a brush
       * @type Number
       * @default
       */
      width:            1,

      /**
       * Shadow object representing shadow of this shape.
       * <b>Backwards incompatibility note:</b> This property replaces "shadowColor" (String), "shadowOffsetX" (Number),
       * "shadowOffsetY" (Number) and "shadowBlur" (Number) since v1.2.12
       * @type fabric.Shadow
       * @default
       */
      shadow:           null,

      /**
       * Line endings style of a brush (one of "butt", "round", "square")
       * @type String
       * @default
       */
      strokeLineCap:    'round',

      /**
       * Corner style of a brush (one of "bevil", "round", "miter")
       * @type String
       * @default
       */
      strokeLineJoin:   'round',

      /**
       * Stroke Dash Array.
       * @type Array
       * @default
       */
      strokeDashArray:  null,

      /**
       * Sets shadow of an object
       * @param {Object|String} [options] Options object or string (e.g. "2px 2px 10px rgba(0,0,0,0.2)")
       * @return {fabric.Object} thisArg
       * @chainable
       */
      setShadow: function(options) {
        this.shadow = new fabric.Shadow(options);
        return this;
      },

      /**
       * Sets brush styles
       * @private
       */
      _setBrushStyles: function() {
        var ctx = this.canvas.contextTop;

        ctx.strokeStyle = this.color;
        ctx.lineWidth = this.width;
        ctx.lineCap = this.strokeLineCap;
        ctx.lineJoin = this.strokeLineJoin;
        if (this.strokeDashArray && fabric.StaticCanvas.supports('setLineDash')) {
          ctx.setLineDash(this.strokeDashArray);
        }
      },

      /**
       * Sets brush shadow styles
       * @private
       */
      _setShadow: function() {
        if (!this.shadow) {
          return;
        }

        var ctx = this.canvas.contextTop;

        ctx.shadowColor = this.shadow.color;
        ctx.shadowBlur = this.shadow.blur;
        ctx.shadowOffsetX = this.shadow.offsetX;
        ctx.shadowOffsetY = this.shadow.offsetY;
      },

      /**
       * Removes brush shadow styles
       * @private
       */
      _resetShadow: function() {
        var ctx = this.canvas.contextTop;

        ctx.shadowColor = '';
        ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;
      }
    });

    (function() {

      /**
       * PencilBrush class
       * @class fabric.PencilBrush
       * @extends fabric.BaseBrush
       */
      fabric.PencilBrush = fabric.util.createClass(fabric.BaseBrush, /** @lends fabric.PencilBrush.prototype */ {

        /**
         * Constructor
         * @param {fabric.Canvas} canvas
         * @return {fabric.PencilBrush} Instance of a pencil brush
         */
        initialize: function(canvas) {
          this.canvas = canvas;
          this._points = [ ];
        },

        /**
         * Inovoked on mouse down
         * @param {Object} pointer
         */
        onMouseDown: function(pointer) {
          this._prepareForDrawing(pointer);
          // capture coordinates immediately
          // this allows to draw dots (when movement never occurs)
          this._captureDrawingPath(pointer);
          this._render();
        },

        /**
         * Inovoked on mouse move
         * @param {Object} pointer
         */
        onMouseMove: function(pointer) {
          this._captureDrawingPath(pointer);
          // redraw curve
          // clear top canvas
          this.canvas.clearContext(this.canvas.contextTop);
          this._render();
        },

        /**
         * Invoked on mouse up
         */
        onMouseUp: function() {
          this._finalizeAndAddPath();
        },

        /**
         * @private
         * @param {Object} pointer Actual mouse position related to the canvas.
         */
        _prepareForDrawing: function(pointer) {

          var p = new fabric.Point(pointer.x, pointer.y);

          this._reset();
          this._addPoint(p);

          this.canvas.contextTop.moveTo(p.x, p.y);
        },

        /**
         * @private
         * @param {fabric.Point} point Point to be added to points array
         */
        _addPoint: function(point) {
          this._points.push(point);
        },

        /**
         * Clear points array and set contextTop canvas style.
         * @private
         */
        _reset: function() {
          this._points.length = 0;

          this._setBrushStyles();
          this._setShadow();
        },

        /**
         * @private
         * @param {Object} pointer Actual mouse position related to the canvas.
         */
        _captureDrawingPath: function(pointer) {
          var pointerPoint = new fabric.Point(pointer.x, pointer.y);
          this._addPoint(pointerPoint);
        },

        /**
         * Draw a smooth path on the topCanvas using quadraticCurveTo
         * @private
         */
        _render: function() {
          var ctx  = this.canvas.contextTop,
              v = this.canvas.viewportTransform,
              p1 = this._points[0],
              p2 = this._points[1];

          ctx.save();
          ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);
          ctx.beginPath();

          //if we only have 2 points in the path and they are the same
          //it means that the user only clicked the canvas without moving the mouse
          //then we should be drawing a dot. A path isn't drawn between two identical dots
          //that's why we set them apart a bit
          if (this._points.length === 2 && p1.x === p2.x && p1.y === p2.y) {
            p1.x -= 0.5;
            p2.x += 0.5;
          }
          ctx.moveTo(p1.x, p1.y);

          for (var i = 1, len = this._points.length; i < len; i++) {
            // we pick the point between pi + 1 & pi + 2 as the
            // end point and p1 as our control point.
            var midPoint = p1.midPointFrom(p2);
            ctx.quadraticCurveTo(p1.x, p1.y, midPoint.x, midPoint.y);

            p1 = this._points[i];
            p2 = this._points[i + 1];
          }
          // Draw last line as a straight line while
          // we wait for the next point to be able to calculate
          // the bezier control point
          ctx.lineTo(p1.x, p1.y);
          ctx.stroke();
          ctx.restore();
        },

        /**
         * Converts points to SVG path
         * @param {Array} points Array of points
         * @param {Number} minX
         * @param {Number} minY
         * @return {String} SVG path
         */
        convertPointsToSVGPath: function(points) {
          var path = [],
              p1 = new fabric.Point(points[0].x, points[0].y),
              p2 = new fabric.Point(points[1].x, points[1].y);

          path.push('M ', points[0].x, ' ', points[0].y, ' ');
          for (var i = 1, len = points.length; i < len; i++) {
            var midPoint = p1.midPointFrom(p2);
            // p1 is our bezier control point
            // midpoint is our endpoint
            // start point is p(i-1) value.
            path.push('Q ', p1.x, ' ', p1.y, ' ', midPoint.x, ' ', midPoint.y, ' ');
            p1 = new fabric.Point(points[i].x, points[i].y);
            if ((i + 1) < points.length) {
              p2 = new fabric.Point(points[i + 1].x, points[i + 1].y);
            }
          }
          path.push('L ', p1.x, ' ', p1.y, ' ');
          return path;
        },

        /**
         * Creates fabric.Path object to add on canvas
         * @param {String} pathData Path data
         * @return {fabric.Path} Path to add on canvas
         */
        createPath: function(pathData) {
          var path = new fabric.Path(pathData, {
                       fill: null,
                       stroke: this.color,
                       strokeWidth: this.width,
                       strokeLineCap: this.strokeLineCap,
                       strokeLineJoin: this.strokeLineJoin,
                       strokeDashArray: this.strokeDashArray,
                       originX: 'center',
                       originY: 'center'
                     });

          if (this.shadow) {
            this.shadow.affectStroke = true;
            path.setShadow(this.shadow);
          }

          return path;
        },

        /**
         * On mouseup after drawing the path on contextTop canvas
         * we use the points captured to create an new fabric path object
         * and add it to the fabric canvas.
         */
        _finalizeAndAddPath: function() {
          var ctx = this.canvas.contextTop;
          ctx.closePath();

          var pathData = this.convertPointsToSVGPath(this._points).join('');
          if (pathData === 'M 0 0 Q 0 0 0 0 L 0 0') {
            // do not create 0 width/height paths, as they are
            // rendered inconsistently across browsers
            // Firefox 4, for example, renders a dot,
            // whereas Chrome 10 renders nothing
            this.canvas.renderAll();
            return;
          }

          var path = this.createPath(pathData);

          this.canvas.add(path);
          path.setCoords();

          this.canvas.clearContext(this.canvas.contextTop);
          this._resetShadow();
          this.canvas.renderAll();

          // fire event 'path' created
          this.canvas.fire('path:created', { path: path });
        }
      });
    })();

    /**
     * CircleBrush class
     * @class fabric.CircleBrush
     */
    fabric.CircleBrush = fabric.util.createClass(fabric.BaseBrush, /** @lends fabric.CircleBrush.prototype */ {

      /**
       * Width of a brush
       * @type Number
       * @default
       */
      width: 10,

      /**
       * Constructor
       * @param {fabric.Canvas} canvas
       * @return {fabric.CircleBrush} Instance of a circle brush
       */
      initialize: function(canvas) {
        this.canvas = canvas;
        this.points = [ ];
      },

      /**
       * Invoked inside on mouse down and mouse move
       * @param {Object} pointer
       */
      drawDot: function(pointer) {
        var point = this.addPoint(pointer),
            ctx = this.canvas.contextTop,
            v = this.canvas.viewportTransform;
        ctx.save();
        ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);

        ctx.fillStyle = point.fill;
        ctx.beginPath();
        ctx.arc(point.x, point.y, point.radius, 0, Math.PI * 2, false);
        ctx.closePath();
        ctx.fill();

        ctx.restore();
      },

      /**
       * Invoked on mouse down
       */
      onMouseDown: function(pointer) {
        this.points.length = 0;
        this.canvas.clearContext(this.canvas.contextTop);
        this._setShadow();
        this.drawDot(pointer);
      },

      /**
       * Invoked on mouse move
       * @param {Object} pointer
       */
      onMouseMove: function(pointer) {
        this.drawDot(pointer);
      },

      /**
       * Invoked on mouse up
       */
      onMouseUp: function() {
        var originalRenderOnAddRemove = this.canvas.renderOnAddRemove;
        this.canvas.renderOnAddRemove = false;

        var circles = [ ];

        for (var i = 0, len = this.points.length; i < len; i++) {
          var point = this.points[i],
              circle = new fabric.Circle({
                radius: point.radius,
                left: point.x,
                top: point.y,
                originX: 'center',
                originY: 'center',
                fill: point.fill
              });

          this.shadow && circle.setShadow(this.shadow);

          circles.push(circle);
        }
        var group = new fabric.Group(circles, { originX: 'center', originY: 'center' });
        group.canvas = this.canvas;

        this.canvas.add(group);
        this.canvas.fire('path:created', { path: group });

        this.canvas.clearContext(this.canvas.contextTop);
        this._resetShadow();
        this.canvas.renderOnAddRemove = originalRenderOnAddRemove;
        this.canvas.renderAll();
      },

      /**
       * @param {Object} pointer
       * @return {fabric.Point} Just added pointer point
       */
      addPoint: function(pointer) {
        var pointerPoint = new fabric.Point(pointer.x, pointer.y),

            circleRadius = fabric.util.getRandomInt(
                            Math.max(0, this.width - 20), this.width + 20) / 2,

            circleColor = new fabric.Color(this.color)
                            .setAlpha(fabric.util.getRandomInt(0, 100) / 100)
                            .toRgba();

        pointerPoint.radius = circleRadius;
        pointerPoint.fill = circleColor;

        this.points.push(pointerPoint);

        return pointerPoint;
      }
    });

    /**
     * SprayBrush class
     * @class fabric.SprayBrush
     */
    fabric.SprayBrush = fabric.util.createClass( fabric.BaseBrush, /** @lends fabric.SprayBrush.prototype */ {

      /**
       * Width of a spray
       * @type Number
       * @default
       */
      width:              10,

      /**
       * Density of a spray (number of dots per chunk)
       * @type Number
       * @default
       */
      density:            20,

      /**
       * Width of spray dots
       * @type Number
       * @default
       */
      dotWidth:           1,

      /**
       * Width variance of spray dots
       * @type Number
       * @default
       */
      dotWidthVariance:   1,

      /**
       * Whether opacity of a dot should be random
       * @type Boolean
       * @default
       */
      randomOpacity:        false,

      /**
       * Whether overlapping dots (rectangles) should be removed (for performance reasons)
       * @type Boolean
       * @default
       */
      optimizeOverlapping:  true,

      /**
       * Constructor
       * @param {fabric.Canvas} canvas
       * @return {fabric.SprayBrush} Instance of a spray brush
       */
      initialize: function(canvas) {
        this.canvas = canvas;
        this.sprayChunks = [ ];
      },

      /**
       * Invoked on mouse down
       * @param {Object} pointer
       */
      onMouseDown: function(pointer) {
        this.sprayChunks.length = 0;
        this.canvas.clearContext(this.canvas.contextTop);
        this._setShadow();

        this.addSprayChunk(pointer);
        this.render();
      },

      /**
       * Invoked on mouse move
       * @param {Object} pointer
       */
      onMouseMove: function(pointer) {
        this.addSprayChunk(pointer);
        this.render();
      },

      /**
       * Invoked on mouse up
       */
      onMouseUp: function() {
        var originalRenderOnAddRemove = this.canvas.renderOnAddRemove;
        this.canvas.renderOnAddRemove = false;

        var rects = [ ];

        for (var i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {
          var sprayChunk = this.sprayChunks[i];

          for (var j = 0, jlen = sprayChunk.length; j < jlen; j++) {

            var rect = new fabric.Rect({
              width: sprayChunk[j].width,
              height: sprayChunk[j].width,
              left: sprayChunk[j].x + 1,
              top: sprayChunk[j].y + 1,
              originX: 'center',
              originY: 'center',
              fill: this.color
            });

            this.shadow && rect.setShadow(this.shadow);
            rects.push(rect);
          }
        }

        if (this.optimizeOverlapping) {
          rects = this._getOptimizedRects(rects);
        }

        var group = new fabric.Group(rects, { originX: 'center', originY: 'center' });
        group.canvas = this.canvas;

        this.canvas.add(group);
        this.canvas.fire('path:created', { path: group });

        this.canvas.clearContext(this.canvas.contextTop);
        this._resetShadow();
        this.canvas.renderOnAddRemove = originalRenderOnAddRemove;
        this.canvas.renderAll();
      },

      /**
       * @private
       * @param {Array} rects
       */
      _getOptimizedRects: function(rects) {

        // avoid creating duplicate rects at the same coordinates
        var uniqueRects = { }, key;

        for (var i = 0, len = rects.length; i < len; i++) {
          key = rects[i].left + '' + rects[i].top;
          if (!uniqueRects[key]) {
            uniqueRects[key] = rects[i];
          }
        }
        var uniqueRectsArray = [ ];
        for (key in uniqueRects) {
          uniqueRectsArray.push(uniqueRects[key]);
        }

        return uniqueRectsArray;
      },

      /**
       * Renders brush
       */
      render: function() {
        var ctx = this.canvas.contextTop;
        ctx.fillStyle = this.color;

        var v = this.canvas.viewportTransform;
        ctx.save();
        ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);

        for (var i = 0, len = this.sprayChunkPoints.length; i < len; i++) {
          var point = this.sprayChunkPoints[i];
          if (typeof point.opacity !== 'undefined') {
            ctx.globalAlpha = point.opacity;
          }
          ctx.fillRect(point.x, point.y, point.width, point.width);
        }
        ctx.restore();
      },

      /**
       * @param {Object} pointer
       */
      addSprayChunk: function(pointer) {
        this.sprayChunkPoints = [ ];

        var x, y, width, radius = this.width / 2;

        for (var i = 0; i < this.density; i++) {

          x = fabric.util.getRandomInt(pointer.x - radius, pointer.x + radius);
          y = fabric.util.getRandomInt(pointer.y - radius, pointer.y + radius);

          if (this.dotWidthVariance) {
            width = fabric.util.getRandomInt(
              // bottom clamp width to 1
              Math.max(1, this.dotWidth - this.dotWidthVariance),
              this.dotWidth + this.dotWidthVariance);
          }
          else {
            width = this.dotWidth;
          }

          var point = new fabric.Point(x, y);
          point.width = width;

          if (this.randomOpacity) {
            point.opacity = fabric.util.getRandomInt(0, 100) / 100;
          }

          this.sprayChunkPoints.push(point);
        }

        this.sprayChunks.push(this.sprayChunkPoints);
      }
    });

    /**
     * PatternBrush class
     * @class fabric.PatternBrush
     * @extends fabric.BaseBrush
     */
    fabric.PatternBrush = fabric.util.createClass(fabric.PencilBrush, /** @lends fabric.PatternBrush.prototype */ {

      getPatternSrc: function() {

        var dotWidth = 20,
            dotDistance = 5,
            patternCanvas = fabric.document.createElement('canvas'),
            patternCtx = patternCanvas.getContext('2d');

        patternCanvas.width = patternCanvas.height = dotWidth + dotDistance;

        patternCtx.fillStyle = this.color;
        patternCtx.beginPath();
        patternCtx.arc(dotWidth / 2, dotWidth / 2, dotWidth / 2, 0, Math.PI * 2, false);
        patternCtx.closePath();
        patternCtx.fill();

        return patternCanvas;
      },

      getPatternSrcFunction: function() {
        return String(this.getPatternSrc).replace('this.color', '"' + this.color + '"');
      },

      /**
       * Creates "pattern" instance property
       */
      getPattern: function() {
        return this.canvas.contextTop.createPattern(this.source || this.getPatternSrc(), 'repeat');
      },

      /**
       * Sets brush styles
       */
      _setBrushStyles: function() {
        this.callSuper('_setBrushStyles');
        this.canvas.contextTop.strokeStyle = this.getPattern();
      },

      /**
       * Creates path
       */
      createPath: function(pathData) {
        var path = this.callSuper('createPath', pathData);
        path.stroke = new fabric.Pattern({
          source: this.source || this.getPatternSrcFunction()
        });
        return path;
      }
    });

    (function() {

      var getPointer = fabric.util.getPointer,
          degreesToRadians = fabric.util.degreesToRadians,
          radiansToDegrees = fabric.util.radiansToDegrees,
          atan2 = Math.atan2,
          abs = Math.abs,

          STROKE_OFFSET = 0.5;

      /**
       * Canvas class
       * @class fabric.Canvas
       * @extends fabric.StaticCanvas
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#canvas}
       * @see {@link fabric.Canvas#initialize} for constructor definition
       *
       * @fires object:modified
       * @fires object:rotating
       * @fires object:scaling
       * @fires object:moving
       * @fires object:selected
       *
       * @fires before:selection:cleared
       * @fires selection:cleared
       * @fires selection:created
       *
       * @fires path:created
       * @fires mouse:down
       * @fires mouse:move
       * @fires mouse:up
       * @fires mouse:over
       * @fires mouse:out
       *
       */
      fabric.Canvas = fabric.util.createClass(fabric.StaticCanvas, /** @lends fabric.Canvas.prototype */ {

        /**
         * Constructor
         * @param {HTMLElement | String} el &lt;canvas> element to initialize instance on
         * @param {Object} [options] Options object
         * @return {Object} thisArg
         */
        initialize: function(el, options) {
          options || (options = { });

          this._initStatic(el, options);
          this._initInteractive();
          this._createCacheCanvas();
        },

        /**
         * When true, objects can be transformed by one side (unproportionally)
         * @type Boolean
         * @default
         */
        uniScaleTransform:      false,

        /**
         * Indicates which key enable unproportional scaling
         * values: altKey, shiftKey, ctrlKey
         * @since 1.6.2
         * @type String
         * @default
         */
        uniScaleKey:           'shiftKey',

        /**
         * When true, objects use center point as the origin of scale transformation.
         * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
         * @since 1.3.4
         * @type Boolean
         * @default
         */
        centeredScaling:        false,

        /**
         * When true, objects use center point as the origin of rotate transformation.
         * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
         * @since 1.3.4
         * @type Boolean
         * @default
         */
        centeredRotation:       false,

        /**
         * Indicates which key enable centered Transfrom
         * values: altKey, shiftKey, ctrlKey
         * @since 1.6.2
         * @type String
         * @default
         */
        centeredKey:           'altKey',

        /**
         * Indicates which key enable alternate action on corner
         * values: altKey, shiftKey, ctrlKey
         * @since 1.6.2
         * @type String
         * @default
         */
        altActionKey:           'shiftKey',

        /**
         * Indicates that canvas is interactive. This property should not be changed.
         * @type Boolean
         * @default
         */
        interactive:            true,

        /**
         * Indicates whether group selection should be enabled
         * @type Boolean
         * @default
         */
        selection:              true,

        /**
         * Indicates which key enable multiple click selection
         * values: altKey, shiftKey, ctrlKey
         * @since 1.6.2
         * @type String
         * @default
         */
        selectionKey:           'shiftKey',

        /**
         * Color of selection
         * @type String
         * @default
         */
        selectionColor:         'rgba(100, 100, 255, 0.3)', // blue

        /**
         * Default dash array pattern
         * If not empty the selection border is dashed
         * @type Array
         */
        selectionDashArray:     [ ],

        /**
         * Color of the border of selection (usually slightly darker than color of selection itself)
         * @type String
         * @default
         */
        selectionBorderColor:   'rgba(255, 255, 255, 0.3)',

        /**
         * Width of a line used in object/group selection
         * @type Number
         * @default
         */
        selectionLineWidth:     1,

        /**
         * Default cursor value used when hovering over an object on canvas
         * @type String
         * @default
         */
        hoverCursor:            'move',

        /**
         * Default cursor value used when moving an object on canvas
         * @type String
         * @default
         */
        moveCursor:             'move',

        /**
         * Default cursor value used for the entire canvas
         * @type String
         * @default
         */
        defaultCursor:          'default',

        /**
         * Cursor value used during free drawing
         * @type String
         * @default
         */
        freeDrawingCursor:      'crosshair',

        /**
         * Cursor value used for rotation point
         * @type String
         * @default
         */
        rotationCursor:         'crosshair',

        /**
         * Default element class that's given to wrapper (div) element of canvas
         * @type String
         * @default
         */
        containerClass:         'canvas-container',

        /**
         * When true, object detection happens on per-pixel basis rather than on per-bounding-box
         * @type Boolean
         * @default
         */
        perPixelTargetFind:     false,

        /**
         * Number of pixels around target pixel to tolerate (consider active) during object detection
         * @type Number
         * @default
         */
        targetFindTolerance:    0,

        /**
         * When true, target detection is skipped when hovering over canvas. This can be used to improve performance.
         * @type Boolean
         * @default
         */
        skipTargetFind:         false,

        /**
         * When true, mouse events on canvas (mousedown/mousemove/mouseup) result in free drawing.
         * After mousedown, mousemove creates a shape,
         * and then mouseup finalizes it and adds an instance of `fabric.Path` onto canvas.
         * @tutorial {@link http://fabricjs.com/fabric-intro-part-4#free_drawing}
         * @type Boolean
         * @default
         */
        isDrawingMode:          false,

        /**
         * @private
         */
        _initInteractive: function() {
          this._currentTransform = null;
          this._groupSelector = null;
          this._initWrapperElement();
          this._createUpperCanvas();
          this._initEventListeners();

          this._initRetinaScaling();

          this.freeDrawingBrush = fabric.PencilBrush && new fabric.PencilBrush(this);

          this.calcOffset();
        },

        /**
         * Resets the current transform to its original values and chooses the type of resizing based on the event
         * @private
         * @param {Event} e Event object fired on mousemove
         */
        _resetCurrentTransform: function() {
          var t = this._currentTransform;

          t.target.set({
            scaleX: t.original.scaleX,
            scaleY: t.original.scaleY,
            skewX: t.original.skewX,
            skewY: t.original.skewY,
            left: t.original.left,
            top: t.original.top
          });

          if (this._shouldCenterTransform(t.target)) {
            if (t.action === 'rotate') {
              this._setOriginToCenter(t.target);
            }
            else {
              if (t.originX !== 'center') {
                if (t.originX === 'right') {
                  t.mouseXSign = -1;
                }
                else {
                  t.mouseXSign = 1;
                }
              }
              if (t.originY !== 'center') {
                if (t.originY === 'bottom') {
                  t.mouseYSign = -1;
                }
                else {
                  t.mouseYSign = 1;
                }
              }

              t.originX = 'center';
              t.originY = 'center';
            }
          }
          else {
            t.originX = t.original.originX;
            t.originY = t.original.originY;
          }
        },

        /**
         * Checks if point is contained within an area of given object
         * @param {Event} e Event object
         * @param {fabric.Object} target Object to test against
         * @return {Boolean} true if point is contained within an area of given object
         */
        containsPoint: function (e, target) {
          var pointer = this.getPointer(e, true),
              xy = this._normalizePointer(target, pointer);

          // http://www.geog.ubc.ca/courses/klink/gis.notes/ncgia/u32.html
          // http://idav.ucdavis.edu/~okreylos/TAship/Spring2000/PointInPolygon.html
          return (target.containsPoint(xy) || target._findTargetCorner(pointer));
        },

        /**
         * @private
         */
        _normalizePointer: function (object, pointer) {
          var activeGroup = this.getActiveGroup(),
              isObjectInGroup = (
                activeGroup &&
                object.type !== 'group' &&
                activeGroup.contains(object)),
              lt, m;

          Iif (isObjectInGroup) {
            m = fabric.util.multiplyTransformMatrices(
                  this.viewportTransform,
                  activeGroup.calcTransformMatrix());

            m = fabric.util.invertTransform(m);
            pointer = fabric.util.transformPoint(pointer, m , false);
            lt = fabric.util.transformPoint(activeGroup.getCenterPoint(), m , false);
            pointer.x -= lt.x;
            pointer.y -= lt.y;
          }
          return { x: pointer.x, y: pointer.y };
        },

        /**
         * Returns true if object is transparent at a certain location
         * @param {fabric.Object} target Object to check
         * @param {Number} x Left coordinate
         * @param {Number} y Top coordinate
         * @return {Boolean}
         */
        isTargetTransparent: function (target, x, y) {
          var hasBorders = target.hasBorders,
              transparentCorners = target.transparentCorners,
              ctx = this.contextCache,
              shouldTransform = target.group && target.group === this.getActiveGroup();

          target.hasBorders = target.transparentCorners = false;

          if (shouldTransform) {
            ctx.save();
            ctx.transform.apply(ctx, target.group.calcTransformMatrix());
          }
          target.render(ctx);
          target.active && target._renderControls(ctx);

          target.hasBorders = hasBorders;
          target.transparentCorners = transparentCorners;

          var isTransparent = fabric.util.isTransparent(
            ctx, x, y, this.targetFindTolerance);
          shouldTransform && ctx.restore();

          this.clearContext(ctx);

          return isTransparent;
        },

        /**
         * @private
         * @param {Event} e Event object
         * @param {fabric.Object} target
         */
        _shouldClearSelection: function (e, target) {
          var activeGroup = this.getActiveGroup(),
              activeObject = this.getActiveObject();

          return (
            !target
            ||
            (target &&
              activeGroup &&
              !activeGroup.contains(target) &&
              activeGroup !== target &&
              !e[this.selectionKey])
            ||
            (target && !target.evented)
            ||
            (target &&
              !target.selectable &&
              activeObject &&
              activeObject !== target)
          );
        },

        /**
         * @private
         * @param {fabric.Object} target
         */
        _shouldCenterTransform: function (target) {
          if (!target) {
            return;
          }

          var t = this._currentTransform,
              centerTransform;

          if (t.action === 'scale' || t.action === 'scaleX' || t.action === 'scaleY') {
            centerTransform = this.centeredScaling || target.centeredScaling;
          }
          else if (t.action === 'rotate') {
            centerTransform = this.centeredRotation || target.centeredRotation;
          }

          return centerTransform ? !t.altKey : t.altKey;
        },

        /**
         * @private
         */
        _getOriginFromCorner: function(target, corner) {
          var origin = {
            x: target.originX,
            y: target.originY
          };

          if (corner === 'ml' || corner === 'tl' || corner === 'bl') {
            origin.x = 'right';
          }
          else if (corner === 'mr' || corner === 'tr' || corner === 'br') {
            origin.x = 'left';
          }

          if (corner === 'tl' || corner === 'mt' || corner === 'tr') {
            origin.y = 'bottom';
          }
          else if (corner === 'bl' || corner === 'mb' || corner === 'br') {
            origin.y = 'top';
          }

          return origin;
        },

        /**
         * @private
         */
        _getActionFromCorner: function(target, corner, e) {
          if (!corner) {
            return 'drag';
          }

          switch (corner) {
            case 'mtr':
              return 'rotate';
            case 'ml':
            case 'mr':
              return e[this.altActionKey] ? 'skewY' : 'scaleX';
            case 'mt':
            case 'mb':
              return e[this.altActionKey] ? 'skewX' : 'scaleY';
            default:
              return 'scale';
          }
        },

        /**
         * @private
         * @param {Event} e Event object
         * @param {fabric.Object} target
         */
        _setupCurrentTransform: function (e, target) {
          if (!target) {
            return;
          }

          var pointer = this.getPointer(e),
              corner = target._findTargetCorner(this.getPointer(e, true)),
              action = this._getActionFromCorner(target, corner, e),
              origin = this._getOriginFromCorner(target, corner);

          this._currentTransform = {
            target: target,
            action: action,
            corner: corner,
            scaleX: target.scaleX,
            scaleY: target.scaleY,
            skewX: target.skewX,
            skewY: target.skewY,
            offsetX: pointer.x - target.left,
            offsetY: pointer.y - target.top,
            originX: origin.x,
            originY: origin.y,
            ex: pointer.x,
            ey: pointer.y,
            lastX: pointer.x,
            lastY: pointer.y,
            left: target.left,
            top: target.top,
            theta: degreesToRadians(target.angle),
            width: target.width * target.scaleX,
            mouseXSign: 1,
            mouseYSign: 1,
            shiftKey: e.shiftKey,
            altKey: e[this.centeredKey]
          };

          this._currentTransform.original = {
            left: target.left,
            top: target.top,
            scaleX: target.scaleX,
            scaleY: target.scaleY,
            skewX: target.skewX,
            skewY: target.skewY,
            originX: origin.x,
            originY: origin.y
          };

          this._resetCurrentTransform();
        },

        /**
         * Translates object by "setting" its left/top
         * @private
         * @param {Number} x pointer's x coordinate
         * @param {Number} y pointer's y coordinate
         * @return {Boolean} true if the translation occurred
         */
        _translateObject: function (x, y) {
          var transform = this._currentTransform,
              target = transform.target,
              newLeft = x - transform.offsetX,
              newTop = y - transform.offsetY,
              moveX = !target.get('lockMovementX') && target.left !== newLeft,
              moveY = !target.get('lockMovementY') && target.top !== newTop;

          moveX && target.set('left', newLeft);
          moveY && target.set('top', newTop);
          return moveX || moveY;
        },

        /**
         * Check if we are increasing a positive skew or lower it,
         * checking mouse direction and pressed corner.
         * @private
         */
        _changeSkewTransformOrigin: function(mouseMove, t, by) {
          var property = 'originX', origins = { 0: 'center' },
              skew = t.target.skewX, originA = 'left', originB = 'right',
              corner = t.corner === 'mt' || t.corner === 'ml' ? 1 : -1,
              flipSign = 1;

          mouseMove = mouseMove > 0 ? 1 : -1;
          if (by === 'y') {
            skew = t.target.skewY;
            originA = 'top';
            originB = 'bottom';
            property = 'originY';
          }
          origins[-1] = originA;
          origins[1] = originB;

          t.target.flipX && (flipSign *= -1);
          t.target.flipY && (flipSign *= -1);

          if (skew === 0) {
            t.skewSign = -corner * mouseMove * flipSign;
            t[property] = origins[-mouseMove];
          }
          else {
            skew = skew > 0 ? 1 : -1;
            t.skewSign = skew;
            t[property] = origins[skew * corner * flipSign];
          }
        },

        /**
         * Skew object by mouse events
         * @private
         * @param {Number} x pointer's x coordinate
         * @param {Number} y pointer's y coordinate
         * @param {String} by Either 'x' or 'y'
         * @return {Boolean} true if the skewing occurred
         */
        _skewObject: function (x, y, by) {
          var t = this._currentTransform,
              target = t.target, skewed = false,
              lockSkewingX = target.get('lockSkewingX'),
              lockSkewingY = target.get('lockSkewingY');

          if ((lockSkewingX && by === 'x') || (lockSkewingY && by === 'y')) {
            return false;
          }

          // Get the constraint point
          var center = target.getCenterPoint(),
              actualMouseByCenter = target.toLocalPoint(new fabric.Point(x, y), 'center', 'center')[by],
              lastMouseByCenter = target.toLocalPoint(new fabric.Point(t.lastX, t.lastY), 'center', 'center')[by],
              actualMouseByOrigin, constraintPosition, dim = target._getTransformedDimensions();

          this._changeSkewTransformOrigin(actualMouseByCenter - lastMouseByCenter, t, by);
          actualMouseByOrigin = target.toLocalPoint(new fabric.Point(x, y), t.originX, t.originY)[by],

          constraintPosition = target.translateToOriginPoint(center, t.originX, t.originY);
          // Actually skew the object
          skewed = this._setObjectSkew(actualMouseByOrigin, t, by, dim);
          t.lastX = x;
          t.lastY = y;
          // Make sure the constraints apply
          target.setPositionByOrigin(constraintPosition, t.originX, t.originY);
          return skewed;
        },

        /**
         * Set object skew
         * @private
         * @return {Boolean} true if the skewing occurred
         */
        _setObjectSkew: function(localMouse, transform, by, _dim) {
          var target = transform.target, newValue, skewed = false,
              skewSign = transform.skewSign, newDim, dimNoSkew,
              otherBy, _otherBy, _by, newDimMouse, skewX, skewY;

          if (by === 'x') {
            otherBy = 'y';
            _otherBy = 'Y';
            _by = 'X';
            skewX = 0;
            skewY = target.skewY;
          }
          else {
            otherBy = 'x';
            _otherBy = 'X';
            _by = 'Y';
            skewX = target.skewX;
            skewY = 0;
          }

          dimNoSkew = target._getTransformedDimensions(skewX, skewY);
          newDimMouse = 2 * Math.abs(localMouse) - dimNoSkew[by];
          if (newDimMouse <= 2) {
            newValue = 0;
          }
          else {
            newValue = skewSign * Math.atan((newDimMouse / target['scale' + _by]) /
                                            (dimNoSkew[otherBy] / target['scale' + _otherBy]));
            newValue = fabric.util.radiansToDegrees(newValue);
          }
          skewed = target['skew' + _by] !== newValue;
          target.set('skew' + _by, newValue);
          if (target['skew' + _otherBy] !== 0) {
            newDim = target._getTransformedDimensions();
            newValue = (_dim[otherBy] / newDim[otherBy]) * target['scale' + _otherBy];
            target.set('scale' + _otherBy, newValue);
          }
          return skewed;
        },

        /**
         * Scales object by invoking its scaleX/scaleY methods
         * @private
         * @param {Number} x pointer's x coordinate
         * @param {Number} y pointer's y coordinate
         * @param {String} by Either 'x' or 'y' - specifies dimension constraint by which to scale an object.
         *                    When not provided, an object is scaled by both dimensions equally
         * @return {Boolean} true if the scaling occurred
         */
        _scaleObject: function (x, y, by) {
          var t = this._currentTransform,
              target = t.target,
              lockScalingX = target.get('lockScalingX'),
              lockScalingY = target.get('lockScalingY'),
              lockScalingFlip = target.get('lockScalingFlip');

          if (lockScalingX && lockScalingY) {
            return false;
          }

          // Get the constraint point
          var constraintPosition = target.translateToOriginPoint(target.getCenterPoint(), t.originX, t.originY),
              localMouse = target.toLocalPoint(new fabric.Point(x, y), t.originX, t.originY),
              dim = target._getTransformedDimensions(), scaled = false;

          this._setLocalMouse(localMouse, t);

          // Actually scale the object
          scaled = this._setObjectScale(localMouse, t, lockScalingX, lockScalingY, by, lockScalingFlip, dim);

          // Make sure the constraints apply
          target.setPositionByOrigin(constraintPosition, t.originX, t.originY);
          return scaled;
        },

        /**
         * @private
         * @return {Boolean} true if the scaling occurred
         */
        _setObjectScale: function(localMouse, transform, lockScalingX, lockScalingY, by, lockScalingFlip, _dim) {
          var target = transform.target, forbidScalingX = false, forbidScalingY = false, scaled = false,
              changeX, changeY, scaleX, scaleY;

          scaleX = localMouse.x * target.scaleX / _dim.x;
          scaleY = localMouse.y * target.scaleY / _dim.y;
          changeX = target.scaleX !== scaleX;
          changeY = target.scaleY !== scaleY;

          if (lockScalingFlip && scaleX <= 0 && scaleX < target.scaleX) {
            forbidScalingX = true;
          }

          if (lockScalingFlip && scaleY <= 0 && scaleY < target.scaleY) {
            forbidScalingY = true;
          }

          if (by === 'equally' && !lockScalingX && !lockScalingY) {
            forbidScalingX || forbidScalingY || (scaled = this._scaleObjectEqually(localMouse, target, transform, _dim));
          }
          else if (!by) {
            forbidScalingX || lockScalingX || (target.set('scaleX', scaleX) && (scaled = scaled || changeX));
            forbidScalingY || lockScalingY || (target.set('scaleY', scaleY) && (scaled = scaled || changeY));
          }
          else if (by === 'x' && !target.get('lockUniScaling')) {
            forbidScalingX || lockScalingX || (target.set('scaleX', scaleX) && (scaled = scaled || changeX));
          }
          else if (by === 'y' && !target.get('lockUniScaling')) {
            forbidScalingY || lockScalingY || (target.set('scaleY', scaleY) && (scaled = scaled || changeY));
          }
          transform.newScaleX = scaleX;
          transform.newScaleY = scaleY;
          forbidScalingX || forbidScalingY || this._flipObject(transform, by);
          return scaled;
        },

        /**
         * @private
         * @return {Boolean} true if the scaling occurred
         */
        _scaleObjectEqually: function(localMouse, target, transform, _dim) {

          var dist = localMouse.y + localMouse.x,
              lastDist = _dim.y * transform.original.scaleY / target.scaleY +
                         _dim.x * transform.original.scaleX / target.scaleX,
              scaled;

          // We use transform.scaleX/Y instead of target.scaleX/Y
          // because the object may have a min scale and we'll loose the proportions
          transform.newScaleX = transform.original.scaleX * dist / lastDist;
          transform.newScaleY = transform.original.scaleY * dist / lastDist;
          scaled = transform.newScaleX !== target.scaleX || transform.newScaleY !== target.scaleY;
          target.set('scaleX', transform.newScaleX);
          target.set('scaleY', transform.newScaleY);
          return scaled;
        },

        /**
         * @private
         */
        _flipObject: function(transform, by) {
          if (transform.newScaleX < 0 && by !== 'y') {
            if (transform.originX === 'left') {
              transform.originX = 'right';
            }
            else if (transform.originX === 'right') {
              transform.originX = 'left';
            }
          }

          if (transform.newScaleY < 0 && by !== 'x') {
            if (transform.originY === 'top') {
              transform.originY = 'bottom';
            }
            else if (transform.originY === 'bottom') {
              transform.originY = 'top';
            }
          }
        },

        /**
         * @private
         */
        _setLocalMouse: function(localMouse, t) {
          var target = t.target;

          if (t.originX === 'right') {
            localMouse.x *= -1;
          }
          else if (t.originX === 'center') {
            localMouse.x *= t.mouseXSign * 2;

            if (localMouse.x < 0) {
              t.mouseXSign = -t.mouseXSign;
            }
          }

          if (t.originY === 'bottom') {
            localMouse.y *= -1;
          }
          else if (t.originY === 'center') {
            localMouse.y *= t.mouseYSign * 2;

            if (localMouse.y < 0) {
              t.mouseYSign = -t.mouseYSign;
            }
          }

          // adjust the mouse coordinates when dealing with padding
          if (abs(localMouse.x) > target.padding) {
            if (localMouse.x < 0) {
              localMouse.x += target.padding;
            }
            else {
              localMouse.x -= target.padding;
            }
          }
          else { // mouse is within the padding, set to 0
            localMouse.x = 0;
          }

          if (abs(localMouse.y) > target.padding) {
            if (localMouse.y < 0) {
              localMouse.y += target.padding;
            }
            else {
              localMouse.y -= target.padding;
            }
          }
          else {
            localMouse.y = 0;
          }
        },

        /**
         * Rotates object by invoking its rotate method
         * @private
         * @param {Number} x pointer's x coordinate
         * @param {Number} y pointer's y coordinate
         * @return {Boolean} true if the rotation occurred
         */
        _rotateObject: function (x, y) {

          var t = this._currentTransform;

          if (t.target.get('lockRotation')) {
            return false;
          }

          var lastAngle = atan2(t.ey - t.top, t.ex - t.left),
              curAngle = atan2(y - t.top, x - t.left),
              angle = radiansToDegrees(curAngle - lastAngle + t.theta);

          // normalize angle to positive value
          if (angle < 0) {
            angle = 360 + angle;
          }

          t.target.angle = angle % 360;
          return true;
        },

        /**
         * Set the cursor type of the canvas element
         * @param {String} value Cursor type of the canvas element.
         * @see http://www.w3.org/TR/css3-ui/#cursor
         */
        setCursor: function (value) {
          this.upperCanvasEl.style.cursor = value;
        },

        /**
         * @private
         */
        _resetObjectTransform: function (target) {
          target.scaleX = 1;
          target.scaleY = 1;
          target.skewX = 0;
          target.skewY = 0;
          target.setAngle(0);
        },

        /**
         * @private
         */
        _drawSelection: function () {
          var ctx = this.contextTop,
              groupSelector = this._groupSelector,
              left = groupSelector.left,
              top = groupSelector.top,
              aleft = abs(left),
              atop = abs(top);

          ctx.fillStyle = this.selectionColor;

          ctx.fillRect(
            groupSelector.ex - ((left > 0) ? 0 : -left),
            groupSelector.ey - ((top > 0) ? 0 : -top),
            aleft,
            atop
          );

          ctx.lineWidth = this.selectionLineWidth;
          ctx.strokeStyle = this.selectionBorderColor;

          // selection border
          if (this.selectionDashArray.length > 1) {

            var px = groupSelector.ex + STROKE_OFFSET - ((left > 0) ? 0: aleft),
                py = groupSelector.ey + STROKE_OFFSET - ((top > 0) ? 0: atop);

            ctx.beginPath();

            fabric.util.drawDashedLine(ctx, px, py, px + aleft, py, this.selectionDashArray);
            fabric.util.drawDashedLine(ctx, px, py + atop - 1, px + aleft, py + atop - 1, this.selectionDashArray);
            fabric.util.drawDashedLine(ctx, px, py, px, py + atop, this.selectionDashArray);
            fabric.util.drawDashedLine(ctx, px + aleft - 1, py, px + aleft - 1, py + atop, this.selectionDashArray);

            ctx.closePath();
            ctx.stroke();
          }
          else {
            ctx.strokeRect(
              groupSelector.ex + STROKE_OFFSET - ((left > 0) ? 0 : aleft),
              groupSelector.ey + STROKE_OFFSET - ((top > 0) ? 0 : atop),
              aleft,
              atop
            );
          }
        },

        /**
         * @private
         */
        _isLastRenderedObject: function(e) {
          return (
            this.controlsAboveOverlay &&
            this.lastRenderedObjectWithControlsAboveOverlay &&
            this.lastRenderedObjectWithControlsAboveOverlay.visible &&
            this.containsPoint(e, this.lastRenderedObjectWithControlsAboveOverlay) &&
            this.lastRenderedObjectWithControlsAboveOverlay._findTargetCorner(this.getPointer(e, true)));
        },

        /**
         * Method that determines what object we are clicking on
         * @param {Event} e mouse event
         * @param {Boolean} skipGroup when true, group is skipped and only objects are traversed through
         */
        findTarget: function (e, skipGroup) {
          Iif (this.skipTargetFind) {
            return;
          }

          Iif (this._isLastRenderedObject(e)) {
            return this.lastRenderedObjectWithControlsAboveOverlay;
          }

          // first check current group (if one exists)
          var activeGroup = this.getActiveGroup();
          Iif (!skipGroup && this._checkTarget(e, activeGroup, this.getPointer(e, true))) {
            return activeGroup;
          }

          var target = this._searchPossibleTargets(e, skipGroup);
          this._fireOverOutEvents(target, e);

          return target;
        },

        /**
         * @private
         */
        _fireOverOutEvents: function(target, e) {
          if (target) {
            if (this._hoveredTarget !== target) {
              if (this._hoveredTarget) {
                this.fire('mouse:out', { target: this._hoveredTarget, e: e });
                this._hoveredTarget.fire('mouseout');
              }
              this.fire('mouse:over', { target: target, e: e });
              target.fire('mouseover');
              this._hoveredTarget = target;
            }
          }
          else Eif (this._hoveredTarget) {
            this.fire('mouse:out', { target: this._hoveredTarget, e: e });
            this._hoveredTarget.fire('mouseout');
            this._hoveredTarget = null;
          }
        },

        /**
         * @private
         */
        _checkTarget: function(e, obj, pointer) {
          if (obj &&
              obj.visible &&
              obj.evented &&
              this.containsPoint(e, obj)){
            Iif ((this.perPixelTargetFind || obj.perPixelTargetFind) && !obj.isEditing) {
              var isTransparent = this.isTargetTransparent(obj, pointer.x, pointer.y);
              if (!isTransparent) {
                return true;
              }
            }
            else {
              return true;
            }
          }
        },

        /**
         * @private
         */
        _searchPossibleTargets: function(e, skipGroup) {

          // Cache all targets where their bounding box contains point.
          var target,
              pointer = this.getPointer(e, true),
              i = this._objects.length;
          // Do not check for currently grouped objects, since we check the parent group itself.
          // untill we call this function specifically to search inside the activeGroup
          while (i--) {
            if ((!this._objects[i].group || skipGroup) && this._checkTarget(e, this._objects[i], pointer)){
              this.relatedTarget = this._objects[i];
              target = this._objects[i];
              break;
            }
          }

          return target;
        },

        /**
         * Returns pointer coordinates relative to canvas.
         * @param {Event} e
         * @return {Object} object with "x" and "y" number values
         */
        getPointer: function (e, ignoreZoom, upperCanvasEl) {
          Eif (!upperCanvasEl) {
            upperCanvasEl = this.upperCanvasEl;
          }
          var pointer = getPointer(e),
              bounds = upperCanvasEl.getBoundingClientRect(),
              boundsWidth = bounds.width || 0,
              boundsHeight = bounds.height || 0,
              cssScale;

          Eif (!boundsWidth || !boundsHeight ) {
            Eif ('top' in bounds && 'bottom' in bounds) {
              boundsHeight = Math.abs( bounds.top - bounds.bottom );
            }
            Eif ('right' in bounds && 'left' in bounds) {
              boundsWidth = Math.abs( bounds.right - bounds.left );
            }
          }

          this.calcOffset();

          pointer.x = pointer.x - this._offset.left;
          pointer.y = pointer.y - this._offset.top;
          Iif (!ignoreZoom) {
            pointer = fabric.util.transformPoint(
              pointer,
              fabric.util.invertTransform(this.viewportTransform)
            );
          }

          Eif (boundsWidth === 0 || boundsHeight === 0) {
            // If bounds are not available (i.e. not visible), do not apply scale.
            cssScale = { width: 1, height: 1 };
          }
          else {
            cssScale = {
              width: upperCanvasEl.width / boundsWidth,
              height: upperCanvasEl.height / boundsHeight
            };
          }

          return {
            x: pointer.x * cssScale.width,
            y: pointer.y * cssScale.height
          };
        },

        /**
         * @private
         * @throws {CANVAS_INIT_ERROR} If canvas can not be initialized
         */
        _createUpperCanvas: function () {
          var lowerCanvasClass = this.lowerCanvasEl.className.replace(/\s*lower-canvas\s*/, '');

          this.upperCanvasEl = this._createCanvasElement();
          fabric.util.addClass(this.upperCanvasEl, 'upper-canvas ' + lowerCanvasClass);

          this.wrapperEl.appendChild(this.upperCanvasEl);

          this._copyCanvasStyle(this.lowerCanvasEl, this.upperCanvasEl);
          this._applyCanvasStyle(this.upperCanvasEl);
          this.contextTop = this.upperCanvasEl.getContext('2d');
        },

        /**
         * @private
         */
        _createCacheCanvas: function () {
          this.cacheCanvasEl = this._createCanvasElement();
          this.cacheCanvasEl.setAttribute('width', this.width);
          this.cacheCanvasEl.setAttribute('height', this.height);
          this.contextCache = this.cacheCanvasEl.getContext('2d');
        },

        /**
         * @private
         */
        _initWrapperElement: function () {
          this.wrapperEl = fabric.util.wrapElement(this.lowerCanvasEl, 'div', {
            'class': this.containerClass
          });
          fabric.util.setStyle(this.wrapperEl, {
            width: this.getWidth() + 'px',
            height: this.getHeight() + 'px',
            position: 'relative'
          });
          fabric.util.makeElementUnselectable(this.wrapperEl);
        },

        /**
         * @private
         * @param {HTMLElement} element canvas element to apply styles on
         */
        _applyCanvasStyle: function (element) {
          var width = this.getWidth() || element.width,
              height = this.getHeight() || element.height;

          fabric.util.setStyle(element, {
            position: 'absolute',
            width: width + 'px',
            height: height + 'px',
            left: 0,
            top: 0
          });
          element.width = width;
          element.height = height;
          fabric.util.makeElementUnselectable(element);
        },

        /**
         * Copys the the entire inline style from one element (fromEl) to another (toEl)
         * @private
         * @param {Element} fromEl Element style is copied from
         * @param {Element} toEl Element copied style is applied to
         */
        _copyCanvasStyle: function (fromEl, toEl) {
          toEl.style.cssText = fromEl.style.cssText;
        },

        /**
         * Returns context of canvas where object selection is drawn
         * @return {CanvasRenderingContext2D}
         */
        getSelectionContext: function() {
          return this.contextTop;
        },

        /**
         * Returns &lt;canvas> element on which object selection is drawn
         * @return {HTMLCanvasElement}
         */
        getSelectionElement: function () {
          return this.upperCanvasEl;
        },

        /**
         * @private
         * @param {Object} object
         */
        _setActiveObject: function(object) {
          if (this._activeObject) {
            this._activeObject.set('active', false);
          }
          this._activeObject = object;
          object.set('active', true);
        },

        /**
         * Sets given object as the only active object on canvas
         * @param {fabric.Object} object Object to set as an active one
         * @param {Event} [e] Event (passed along when firing "object:selected")
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        setActiveObject: function (object, e) {
          this._setActiveObject(object);
          this.renderAll();
          this.fire('object:selected', { target: object, e: e });
          object.fire('selected', { e: e });
          return this;
        },

        /**
         * Returns currently active object
         * @return {fabric.Object} active object
         */
        getActiveObject: function () {
          return this._activeObject;
        },

        /**
         * @private
         */
        _discardActiveObject: function() {
          if (this._activeObject) {
            this._activeObject.set('active', false);
          }
          this._activeObject = null;
        },

        /**
         * Discards currently active object
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        discardActiveObject: function (e) {
          this._discardActiveObject();
          this.renderAll();
          this.fire('selection:cleared', { e: e });
          return this;
        },

        /**
         * @private
         * @param {fabric.Group} group
         */
        _setActiveGroup: function(group) {
          this._activeGroup = group;
          if (group) {
            group.set('active', true);
          }
        },

        /**
         * Sets active group to a specified one
         * @param {fabric.Group} group Group to set as a current one
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        setActiveGroup: function (group, e) {
          this._setActiveGroup(group);
          if (group) {
            this.fire('object:selected', { target: group, e: e });
            group.fire('selected', { e: e });
          }
          return this;
        },

        /**
         * Returns currently active group
         * @return {fabric.Group} Current group
         */
        getActiveGroup: function () {
          return this._activeGroup;
        },

        /**
         * @private
         */
        _discardActiveGroup: function() {
          var g = this.getActiveGroup();
          if (g) {
            g.destroy();
          }
          this.setActiveGroup(null);
        },

        /**
         * Discards currently active group
         * @return {fabric.Canvas} thisArg
         */
        discardActiveGroup: function (e) {
          this._discardActiveGroup();
          this.fire('selection:cleared', { e: e });
          return this;
        },

        /**
         * Deactivates all objects on canvas, removing any active group or object
         * @return {fabric.Canvas} thisArg
         */
        deactivateAll: function () {
          var allObjects = this.getObjects(),
              i = 0,
              len = allObjects.length;
          for ( ; i < len; i++) {
            allObjects[i].set('active', false);
          }
          this._discardActiveGroup();
          this._discardActiveObject();
          return this;
        },

        /**
         * Deactivates all objects and dispatches appropriate events
         * @return {fabric.Canvas} thisArg
         */
        deactivateAllWithDispatch: function (e) {
          var activeObject = this.getActiveGroup() || this.getActiveObject();
          Eif (activeObject) {
            this.fire('before:selection:cleared', { target: activeObject, e: e });
          }
          this.deactivateAll();
          Eif (activeObject) {
            this.fire('selection:cleared', { e: e });
          }
          return this;
        },

        /**
         * Clears a canvas element and removes all event listeners
         * @return {fabric.Canvas} thisArg
         * @chainable
         */
        dispose: function () {
          this.callSuper('dispose');
          var wrapper = this.wrapperEl;
          this.removeListeners();
          wrapper.removeChild(this.upperCanvasEl);
          wrapper.removeChild(this.lowerCanvasEl);
          delete this.upperCanvasEl;
          Iif (wrapper.parentNode) {
            wrapper.parentNode.replaceChild(this.lowerCanvasEl, this.wrapperEl);
          }
          delete this.wrapperEl;
          return this;
        },

        /**
         * Draws objects' controls (borders/controls)
         * @param {CanvasRenderingContext2D} ctx Context to render controls on
         */
        drawControls: function(ctx) {
          var activeGroup = this.getActiveGroup();

          if (activeGroup) {
            activeGroup._renderControls(ctx);
          }
          else {
            this._drawObjectsControls(ctx);
          }
        },

        /**
         * @private
         */
        _drawObjectsControls: function(ctx) {
          for (var i = 0, len = this._objects.length; i < len; ++i) {
            if (!this._objects[i] || !this._objects[i].active) {
              continue;
            }
            this._objects[i]._renderControls(ctx);
            this.lastRenderedObjectWithControlsAboveOverlay = this._objects[i];
          }
        }
      });

      // copying static properties manually to work around Opera's bug,
      // where "prototype" property is enumerable and overrides existing prototype
      for (var prop in fabric.StaticCanvas) {
        Eif (prop !== 'prototype') {
          fabric.Canvas[prop] = fabric.StaticCanvas[prop];
        }
      }

      Iif (fabric.isTouchSupported) {
        /** @ignore */
        fabric.Canvas.prototype._setCursorFromEvent = function() { };
      }

      /**
       * @ignore
       * @class fabric.Element
       * @alias fabric.Canvas
       * @deprecated Use {@link fabric.Canvas} instead.
       * @constructor
       */
      fabric.Element = fabric.Canvas;
    })();

    (function() {

      var cursorOffset = {
        mt: 0, // n
        tr: 1, // ne
        mr: 2, // e
        br: 3, // se
        mb: 4, // s
        bl: 5, // sw
        ml: 6, // w
        tl: 7 // nw
      },
      addListener = fabric.util.addListener,
      removeListener = fabric.util.removeListener;

      fabric.util.object.extend(fabric.Canvas.prototype, /** @lends fabric.Canvas.prototype */ {

        /**
         * Map of cursor style values for each of the object controls
         * @private
         */
        cursorMap: [
          'n-resize',
          'ne-resize',
          'e-resize',
          'se-resize',
          's-resize',
          'sw-resize',
          'w-resize',
          'nw-resize'
        ],

        /**
         * Adds mouse listeners to canvas
         * @private
         */
        _initEventListeners: function () {

          this._bindEvents();

          addListener(fabric.window, 'resize', this._onResize);

          // mouse events
          addListener(this.upperCanvasEl, 'mousedown', this._onMouseDown);
          addListener(this.upperCanvasEl, 'mousemove', this._onMouseMove);
          addListener(this.upperCanvasEl, 'mousewheel', this._onMouseWheel);
          addListener(this.upperCanvasEl, 'mouseout', this._onMouseOut);

          // touch events
          addListener(this.upperCanvasEl, 'touchstart', this._onMouseDown);
          addListener(this.upperCanvasEl, 'touchmove', this._onMouseMove);

          Iif (typeof eventjs !== 'undefined' && 'add' in eventjs) {
            eventjs.add(this.upperCanvasEl, 'gesture', this._onGesture);
            eventjs.add(this.upperCanvasEl, 'drag', this._onDrag);
            eventjs.add(this.upperCanvasEl, 'orientation', this._onOrientationChange);
            eventjs.add(this.upperCanvasEl, 'shake', this._onShake);
            eventjs.add(this.upperCanvasEl, 'longpress', this._onLongPress);
          }
        },

        /**
         * @private
         */
        _bindEvents: function() {
          this._onMouseDown = this._onMouseDown.bind(this);
          this._onMouseMove = this._onMouseMove.bind(this);
          this._onMouseUp = this._onMouseUp.bind(this);
          this._onResize = this._onResize.bind(this);
          this._onGesture = this._onGesture.bind(this);
          this._onDrag = this._onDrag.bind(this);
          this._onShake = this._onShake.bind(this);
          this._onLongPress = this._onLongPress.bind(this);
          this._onOrientationChange = this._onOrientationChange.bind(this);
          this._onMouseWheel = this._onMouseWheel.bind(this);
          this._onMouseOut = this._onMouseOut.bind(this);
        },

        /**
         * Removes all event listeners
         */
        removeListeners: function() {
          removeListener(fabric.window, 'resize', this._onResize);

          removeListener(this.upperCanvasEl, 'mousedown', this._onMouseDown);
          removeListener(this.upperCanvasEl, 'mousemove', this._onMouseMove);
          removeListener(this.upperCanvasEl, 'mousewheel', this._onMouseWheel);
          removeListener(this.upperCanvasEl, 'mouseout', this._onMouseOut);

          removeListener(this.upperCanvasEl, 'touchstart', this._onMouseDown);
          removeListener(this.upperCanvasEl, 'touchmove', this._onMouseMove);

          Iif (typeof eventjs !== 'undefined' && 'remove' in eventjs) {
            eventjs.remove(this.upperCanvasEl, 'gesture', this._onGesture);
            eventjs.remove(this.upperCanvasEl, 'drag', this._onDrag);
            eventjs.remove(this.upperCanvasEl, 'orientation', this._onOrientationChange);
            eventjs.remove(this.upperCanvasEl, 'shake', this._onShake);
            eventjs.remove(this.upperCanvasEl, 'longpress', this._onLongPress);
          }
        },

        /**
         * @private
         * @param {Event} [e] Event object fired on Event.js gesture
         * @param {Event} [self] Inner Event object
         */
        _onGesture: function(e, self) {
          this.__onTransformGesture && this.__onTransformGesture(e, self);
        },

        /**
         * @private
         * @param {Event} [e] Event object fired on Event.js drag
         * @param {Event} [self] Inner Event object
         */
        _onDrag: function(e, self) {
          this.__onDrag && this.__onDrag(e, self);
        },

        /**
         * @private
         * @param {Event} [e] Event object fired on Event.js wheel event
         * @param {Event} [self] Inner Event object
         */
        _onMouseWheel: function(e, self) {
          this.__onMouseWheel && this.__onMouseWheel(e, self);
        },

        /**
         * @private
         * @param {Event} e Event object fired on mousedown
         */
        _onMouseOut: function(e) {
          var target = this._hoveredTarget;
          this.fire('mouse:out', { target: target, e: e });
          this._hoveredTarget = null;
          target && target.fire('mouseout', { e: e });
        },

        /**
         * @private
         * @param {Event} [e] Event object fired on Event.js orientation change
         * @param {Event} [self] Inner Event object
         */
        _onOrientationChange: function(e, self) {
          this.__onOrientationChange && this.__onOrientationChange(e, self);
        },

        /**
         * @private
         * @param {Event} [e] Event object fired on Event.js shake
         * @param {Event} [self] Inner Event object
         */
        _onShake: function(e, self) {
          this.__onShake && this.__onShake(e, self);
        },

        /**
         * @private
         * @param {Event} [e] Event object fired on Event.js shake
         * @param {Event} [self] Inner Event object
         */
        _onLongPress: function(e, self) {
          this.__onLongPress && this.__onLongPress(e, self);
        },

        /**
         * @private
         * @param {Event} e Event object fired on mousedown
         */
        _onMouseDown: function (e) {
          this.__onMouseDown(e);

          addListener(fabric.document, 'touchend', this._onMouseUp);
          addListener(fabric.document, 'touchmove', this._onMouseMove);

          removeListener(this.upperCanvasEl, 'mousemove', this._onMouseMove);
          removeListener(this.upperCanvasEl, 'touchmove', this._onMouseMove);

          if (e.type === 'touchstart') {
            // Unbind mousedown to prevent double triggers from touch devices
            removeListener(this.upperCanvasEl, 'mousedown', this._onMouseDown);
          }
          else {
            addListener(fabric.document, 'mouseup', this._onMouseUp);
            addListener(fabric.document, 'mousemove', this._onMouseMove);
          }
        },

        /**
         * @private
         * @param {Event} e Event object fired on mouseup
         */
        _onMouseUp: function (e) {
          this.__onMouseUp(e);

          removeListener(fabric.document, 'mouseup', this._onMouseUp);
          removeListener(fabric.document, 'touchend', this._onMouseUp);

          removeListener(fabric.document, 'mousemove', this._onMouseMove);
          removeListener(fabric.document, 'touchmove', this._onMouseMove);

          addListener(this.upperCanvasEl, 'mousemove', this._onMouseMove);
          addListener(this.upperCanvasEl, 'touchmove', this._onMouseMove);

          if (e.type === 'touchend') {
            // Wait 400ms before rebinding mousedown to prevent double triggers
            // from touch devices
            var _this = this;
            setTimeout(function() {
              addListener(_this.upperCanvasEl, 'mousedown', _this._onMouseDown);
            }, 400);
          }
        },

        /**
         * @private
         * @param {Event} e Event object fired on mousemove
         */
        _onMouseMove: function (e) {
          !this.allowTouchScrolling && e.preventDefault && e.preventDefault();
          this.__onMouseMove(e);
        },

        /**
         * @private
         */
        _onResize: function () {
          this.calcOffset();
        },

        /**
         * Decides whether the canvas should be redrawn in mouseup and mousedown events.
         * @private
         * @param {Object} target
         * @param {Object} pointer
         */
        _shouldRender: function(target, pointer) {
          var activeObject = this.getActiveGroup() || this.getActiveObject();

          return !!(
            (target && (
              target.isMoving ||
              target !== activeObject))
            ||
            (!target && !!activeObject)
            ||
            (!target && !activeObject && !this._groupSelector)
            ||
            (pointer &&
              this._previousPointer &&
              this.selection && (
              pointer.x !== this._previousPointer.x ||
              pointer.y !== this._previousPointer.y))
          );
        },

        /**
         * Method that defines the actions when mouse is released on canvas.
         * The method resets the currentTransform parameters, store the image corner
         * position in the image object and render the canvas on top.
         * @private
         * @param {Event} e Event object fired on mouseup
         */
        __onMouseUp: function (e) {
          var target, searchTarget = true, transform = this._currentTransform;

          if (this.isDrawingMode && this._isCurrentlyDrawing) {
            this._onMouseUpInDrawingMode(e);
            return;
          }

          if (transform) {
            this._finalizeCurrentTransform();
            searchTarget = !transform.actionPerformed;
          }

          target = searchTarget ? this.findTarget(e, true) : transform.target;

          var shouldRender = this._shouldRender(target, this.getPointer(e));

          this._maybeGroupObjects(e);

          if (target) {
            target.isMoving = false;
          }

          shouldRender && this.renderAll();

          this._handleCursorAndEvent(e, target);
        },

        _handleCursorAndEvent: function(e, target) {
          this._setCursorFromEvent(e, target);

          // Can't find any reason, disabling for now
          // TODO: why are we doing this?
          /* var _this = this;
          setTimeout(function () {
            _this._setCursorFromEvent(e, target);
          }, 50); */

          this.fire('mouse:up', { target: target, e: e });
          target && target.fire('mouseup', { e: e });
        },

        /**
         * @private
         */
        _finalizeCurrentTransform: function() {

          var transform = this._currentTransform,
              target = transform.target;

          if (target._scaling) {
            target._scaling = false;
          }

          target.setCoords();
          this._restoreOriginXY(target);

          if (transform.actionPerformed || (this.stateful && target.hasStateChanged())) {
            this.fire('object:modified', { target: target });
            target.fire('modified');
          }
        },

        /**
         * @private
         * @param {Object} target Object to restore
         */
        _restoreOriginXY: function(target) {
          if (this._previousOriginX && this._previousOriginY) {

            var originPoint = target.translateToOriginPoint(
              target.getCenterPoint(),
              this._previousOriginX,
              this._previousOriginY);

            target.originX = this._previousOriginX;
            target.originY = this._previousOriginY;

            target.left = originPoint.x;
            target.top = originPoint.y;

            this._previousOriginX = null;
            this._previousOriginY = null;
          }
        },

        /**
         * @private
         * @param {Event} e Event object fired on mousedown
         */
        _onMouseDownInDrawingMode: function(e) {
          this._isCurrentlyDrawing = true;
          this.discardActiveObject(e).renderAll();
          if (this.clipTo) {
            fabric.util.clipContext(this, this.contextTop);
          }
          var ivt = fabric.util.invertTransform(this.viewportTransform),
              pointer = fabric.util.transformPoint(this.getPointer(e, true), ivt);
          this.freeDrawingBrush.onMouseDown(pointer);
          this.fire('mouse:down', { e: e });

          var target = this.findTarget(e);
          if (typeof target !== 'undefined') {
            target.fire('mousedown', { e: e, target: target });
          }
        },

        /**
         * @private
         * @param {Event} e Event object fired on mousemove
         */
        _onMouseMoveInDrawingMode: function(e) {
          if (this._isCurrentlyDrawing) {
            var ivt = fabric.util.invertTransform(this.viewportTransform),
                pointer = fabric.util.transformPoint(this.getPointer(e, true), ivt);
            this.freeDrawingBrush.onMouseMove(pointer);
          }
          this.setCursor(this.freeDrawingCursor);
          this.fire('mouse:move', { e: e });

          var target = this.findTarget(e);
          if (typeof target !== 'undefined') {
            target.fire('mousemove', { e: e, target: target });
          }
        },

        /**
         * @private
         * @param {Event} e Event object fired on mouseup
         */
        _onMouseUpInDrawingMode: function(e) {
          this._isCurrentlyDrawing = false;
          if (this.clipTo) {
            this.contextTop.restore();
          }
          this.freeDrawingBrush.onMouseUp();
          this.fire('mouse:up', { e: e });

          var target = this.findTarget(e);
          if (typeof target !== 'undefined') {
            target.fire('mouseup', { e: e, target: target });
          }
        },

        /**
         * Method that defines the actions when mouse is clic ked on canvas.
         * The method inits the currentTransform parameters and renders all the
         * canvas so the current image can be placed on the top canvas and the rest
         * in on the container one.
         * @private
         * @param {Event} e Event object fired on mousedown
         */
        __onMouseDown: function (e) {

          // accept only left clicks
          var isLeftClick  = 'which' in e ? e.which === 1 : e.button === 0;
          if (!isLeftClick && !fabric.isTouchSupported) {
            return;
          }

          if (this.isDrawingMode) {
            this._onMouseDownInDrawingMode(e);
            return;
          }

          // ignore if some object is being transformed at this moment
          if (this._currentTransform) {
            return;
          }

          var target = this.findTarget(e),
              pointer = this.getPointer(e, true);

          // save pointer for check in __onMouseUp event
          this._previousPointer = pointer;

          var shouldRender = this._shouldRender(target, pointer),
              shouldGroup = this._shouldGroup(e, target);

          if (this._shouldClearSelection(e, target)) {
            this._clearSelection(e, target, pointer);
          }
          else if (shouldGroup) {
            this._handleGrouping(e, target);
            target = this.getActiveGroup();
          }

          if (target) {
            if (target.selectable && (target.__corner || !shouldGroup)) {
              this._beforeTransform(e, target);
              this._setupCurrentTransform(e, target);
            }

            if (target !== this.getActiveGroup() && target !== this.getActiveObject()) {
              this.deactivateAll();
              target.selectable && this.setActiveObject(target, e);
            }
          }
          // we must renderAll so that active image is placed on the top canvas
          shouldRender && this.renderAll();

          this.fire('mouse:down', { target: target, e: e });
          target && target.fire('mousedown', { e: e });
        },

        /**
         * @private
         */
        _beforeTransform: function(e, target) {
          this.stateful && target.saveState();

          // determine if it's a drag or rotate case
          if (target._findTargetCorner(this.getPointer(e))) {
            this.onBeforeScaleRotate(target);
          }

        },

        /**
         * @private
         */
        _clearSelection: function(e, target, pointer) {
          this.deactivateAllWithDispatch(e);

          if (target && target.selectable) {
            this.setActiveObject(target, e);
          }
          else if (this.selection) {
            this._groupSelector = {
              ex: pointer.x,
              ey: pointer.y,
              top: 0,
              left: 0
            };
          }
        },

        /**
         * @private
         * @param {Object} target Object for that origin is set to center
         */
        _setOriginToCenter: function(target) {
          this._previousOriginX = this._currentTransform.target.originX;
          this._previousOriginY = this._currentTransform.target.originY;

          var center = target.getCenterPoint();

          target.originX = 'center';
          target.originY = 'center';

          target.left = center.x;
          target.top = center.y;

          this._currentTransform.left = target.left;
          this._currentTransform.top = target.top;
        },

        /**
         * @private
         * @param {Object} target Object for that center is set to origin
         */
        _setCenterToOrigin: function(target) {
          var originPoint = target.translateToOriginPoint(
            target.getCenterPoint(),
            this._previousOriginX,
            this._previousOriginY);

          target.originX = this._previousOriginX;
          target.originY = this._previousOriginY;

          target.left = originPoint.x;
          target.top = originPoint.y;

          this._previousOriginX = null;
          this._previousOriginY = null;
        },

        /**
         * Method that defines the actions when mouse is hovering the canvas.
         * The currentTransform parameter will definde whether the user is rotating/scaling/translating
         * an image or neither of them (only hovering). A group selection is also possible and would cancel
         * all any other type of action.
         * In case of an image transformation only the top canvas will be rendered.
         * @private
         * @param {Event} e Event object fired on mousemove
         */
        __onMouseMove: function (e) {

          var target, pointer;

          if (this.isDrawingMode) {
            this._onMouseMoveInDrawingMode(e);
            return;
          }
          if (typeof e.touches !== 'undefined' && e.touches.length > 1) {
            return;
          }

          var groupSelector = this._groupSelector;

          // We initially clicked in an empty area, so we draw a box for multiple selection
          if (groupSelector) {
            pointer = this.getPointer(e, true);

            groupSelector.left = pointer.x - groupSelector.ex;
            groupSelector.top = pointer.y - groupSelector.ey;

            this.renderTop();
          }
          else if (!this._currentTransform) {
            target = this.findTarget(e);
            this._setCursorFromEvent(e, target);
          }
          else {
            this._transformObject(e);
          }

          this.fire('mouse:move', { target: target, e: e });
          target && target.fire('mousemove', { e: e });
        },

        /**
         * @private
         * @param {Event} e Event fired on mousemove
         */
        _transformObject: function(e) {
          var pointer = this.getPointer(e),
              transform = this._currentTransform;

          transform.reset = false,
          transform.target.isMoving = true;

          this._beforeScaleTransform(e, transform);
          this._performTransformAction(e, transform, pointer);

          this.renderAll();
        },

        /**
         * @private
         */
        _performTransformAction: function(e, transform, pointer) {
          var x = pointer.x,
              y = pointer.y,
              target = transform.target,
              action = transform.action,
              actionPerformed = false;

          if (action === 'rotate') {
            (actionPerformed = this._rotateObject(x, y)) && this._fire('rotating', target, e);
          }
          else if (action === 'scale') {
            (actionPerformed = this._onScale(e, transform, x, y)) && this._fire('scaling', target, e);
          }
          else if (action === 'scaleX') {
            (actionPerformed = this._scaleObject(x, y, 'x')) && this._fire('scaling', target, e);
          }
          else if (action === 'scaleY') {
            (actionPerformed = this._scaleObject(x, y, 'y')) && this._fire('scaling', target, e);
          }
          else if (action === 'skewX') {
            (actionPerformed = this._skewObject(x, y, 'x')) && this._fire('skewing', target, e);
          }
          else if (action === 'skewY') {
            (actionPerformed = this._skewObject(x, y, 'y')) && this._fire('skewing', target, e);
          }
          else {
            actionPerformed = this._translateObject(x, y);
            if (actionPerformed) {
              this._fire('moving', target, e);
              this.setCursor(target.moveCursor || this.moveCursor);
            }
          }
          transform.actionPerformed = actionPerformed;
        },

        /**
         * @private
         */
        _fire: function(eventName, target, e) {
          this.fire('object:' + eventName, { target: target, e: e });
          target.fire(eventName, { e: e });
        },

        /**
         * @private
         */
        _beforeScaleTransform: function(e, transform) {
          if (transform.action === 'scale' || transform.action === 'scaleX' || transform.action === 'scaleY') {
            var centerTransform = this._shouldCenterTransform(transform.target);

            // Switch from a normal resize to center-based
            if ((centerTransform && (transform.originX !== 'center' || transform.originY !== 'center')) ||
               // Switch from center-based resize to normal one
               (!centerTransform && transform.originX === 'center' && transform.originY === 'center')
            ) {
              this._resetCurrentTransform();
              transform.reset = true;
            }
          }
        },

        /**
         * @private
         * @return {Boolean} true if the scaling occurred
         */
        _onScale: function(e, transform, x, y) {
          // rotate object only if shift key is not pressed
          // and if it is not a group we are transforming
          if ((e[this.uniScaleKey] || this.uniScaleTransform) && !transform.target.get('lockUniScaling')) {
            transform.currentAction = 'scale';
            return this._scaleObject(x, y);
          }
          else {
            // Switch from a normal resize to proportional
            if (!transform.reset && transform.currentAction === 'scale') {
              this._resetCurrentTransform();
            }

            transform.currentAction = 'scaleEqually';
            return this._scaleObject(x, y, 'equally');
          }
        },

        /**
         * Sets the cursor depending on where the canvas is being hovered.
         * Note: very buggy in Opera
         * @param {Event} e Event object
         * @param {Object} target Object that the mouse is hovering, if so.
         */
        _setCursorFromEvent: function (e, target) {
          if (!target) {
            this.setCursor(this.defaultCursor);
            return false;
          }

          var hoverCursor = target.hoverCursor || this.hoverCursor;
          if (!target.selectable) {
            //let's skip _findTargetCorner if object is not selectable
            this.setCursor(hoverCursor);
          }
          else {
            var activeGroup = this.getActiveGroup(),
                // only show proper corner when group selection is not active
                corner = target._findTargetCorner
                          && (!activeGroup || !activeGroup.contains(target))
                          && target._findTargetCorner(this.getPointer(e, true));

            if (!corner) {
              this.setCursor(hoverCursor);
            }
            else {
              this._setCornerCursor(corner, target, e);
            }
          }
          //actually unclear why it should return something
          //is never evaluated
          return true;
        },

        /**
         * @private
         */
        _setCornerCursor: function(corner, target, e) {
          if (corner in cursorOffset) {
            this.setCursor(this._getRotatedCornerCursor(corner, target, e));
          }
          else if (corner === 'mtr' && target.hasRotatingPoint) {
            this.setCursor(this.rotationCursor);
          }
          else {
            this.setCursor(this.defaultCursor);
            return false;
          }
        },

        /**
         * @private
         */
        _getRotatedCornerCursor: function(corner, target, e) {
          var n = Math.round((target.getAngle() % 360) / 45);

          if (n < 0) {
            n += 8; // full circle ahead
          }
          n += cursorOffset[corner];
          if (e[this.altActionKey] && cursorOffset[corner] % 2 === 0) {
            //if we are holding shift and we are on a mx corner...
            n += 2;
          }
          // normalize n to be from 0 to 7
          n %= 8;

          return this.cursorMap[n];
        }
      });
    })();

    (function() {

      var min = Math.min,
          max = Math.max;

      fabric.util.object.extend(fabric.Canvas.prototype, /** @lends fabric.Canvas.prototype */ {

        /**
         * @private
         * @param {Event} e Event object
         * @param {fabric.Object} target
         * @return {Boolean}
         */
        _shouldGroup: function(e, target) {
          var activeObject = this.getActiveObject();
          return e[this.selectionKey] && target && target.selectable &&
                (this.getActiveGroup() || (activeObject && activeObject !== target))
                && this.selection;
        },

        /**
         * @private
         * @param {Event} e Event object
         * @param {fabric.Object} target
         */
        _handleGrouping: function (e, target) {

          if (target === this.getActiveGroup()) {

            // if it's a group, find target again, this time skipping group
            target = this.findTarget(e, true);

            // if even object is not found, bail out
            if (!target || target.isType('group')) {
              return;
            }
          }
          if (this.getActiveGroup()) {
            this._updateActiveGroup(target, e);
          }
          else {
            this._createActiveGroup(target, e);
          }

          if (this._activeGroup) {
            this._activeGroup.saveCoords();
          }
        },

        /**
         * @private
         */
        _updateActiveGroup: function(target, e) {
          var activeGroup = this.getActiveGroup();

          if (activeGroup.contains(target)) {

            activeGroup.removeWithUpdate(target);
            target.set('active', false);

            if (activeGroup.size() === 1) {
              // remove group alltogether if after removal it only contains 1 object
              this.discardActiveGroup(e);
              // activate last remaining object
              this.setActiveObject(activeGroup.item(0));
              return;
            }
          }
          else {
            activeGroup.addWithUpdate(target);
          }
          this.fire('selection:created', { target: activeGroup, e: e });
          activeGroup.set('active', true);
        },

        /**
         * @private
         */
        _createActiveGroup: function(target, e) {

          if (this._activeObject && target !== this._activeObject) {

            var group = this._createGroup(target);
            group.addWithUpdate();

            this.setActiveGroup(group);
            this._activeObject = null;

            this.fire('selection:created', { target: group, e: e });
          }

          target.set('active', true);
        },

        /**
         * @private
         * @param {Object} target
         */
        _createGroup: function(target) {

          var objects = this.getObjects(),
              isActiveLower = objects.indexOf(this._activeObject) < objects.indexOf(target),
              groupObjects = isActiveLower
                ? [ this._activeObject, target ]
                : [ target, this._activeObject ];

          return new fabric.Group(groupObjects, {
            canvas: this
          });
        },

        /**
         * @private
         * @param {Event} e mouse event
         */
        _groupSelectedObjects: function (e) {

          var group = this._collectObjects();

          // do not create group for 1 element only
          if (group.length === 1) {
            this.setActiveObject(group[0], e);
          }
          else if (group.length > 1) {
            group = new fabric.Group(group.reverse(), {
              canvas: this
            });
            group.addWithUpdate();
            this.setActiveGroup(group, e);
            group.saveCoords();
            this.fire('selection:created', { target: group });
            this.renderAll();
          }
        },

        /**
         * @private
         */
        _collectObjects: function() {
          var group = [ ],
              currentObject,
              x1 = this._groupSelector.ex,
              y1 = this._groupSelector.ey,
              x2 = x1 + this._groupSelector.left,
              y2 = y1 + this._groupSelector.top,
              selectionX1Y1 = new fabric.Point(min(x1, x2), min(y1, y2)),
              selectionX2Y2 = new fabric.Point(max(x1, x2), max(y1, y2)),
              isClick = x1 === x2 && y1 === y2;

          for (var i = this._objects.length; i--; ) {
            currentObject = this._objects[i];

            if (!currentObject || !currentObject.selectable || !currentObject.visible) {
              continue;
            }

            if (currentObject.intersectsWithRect(selectionX1Y1, selectionX2Y2) ||
                currentObject.isContainedWithinRect(selectionX1Y1, selectionX2Y2) ||
                currentObject.containsPoint(selectionX1Y1) ||
                currentObject.containsPoint(selectionX2Y2)
            ) {
              currentObject.set('active', true);
              group.push(currentObject);

              // only add one object if it's a click
              if (isClick) {
                break;
              }
            }
          }

          return group;
        },

        /**
         * @private
         */
        _maybeGroupObjects: function(e) {
          if (this.selection && this._groupSelector) {
            this._groupSelectedObjects(e);
          }

          var activeGroup = this.getActiveGroup();
          if (activeGroup) {
            activeGroup.setObjectsCoords().setCoords();
            activeGroup.isMoving = false;
            this.setCursor(this.defaultCursor);
          }

          // clear selection and current transformation
          this._groupSelector = null;
          this._currentTransform = null;
        }
      });

    })();

    fabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {

      /**
       * Exports canvas element to a dataurl image. Note that when multiplier is used, cropping is scaled appropriately
       * @param {Object} [options] Options object
       * @param {String} [options.format=png] The format of the output image. Either "jpeg" or "png"
       * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.
       * @param {Number} [options.multiplier=1] Multiplier to scale by
       * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14
       * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14
       * @param {Number} [options.width] Cropping width. Introduced in v1.2.14
       * @param {Number} [options.height] Cropping height. Introduced in v1.2.14
       * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format
       * @see {@link http://jsfiddle.net/fabricjs/NfZVb/|jsFiddle demo}
       * @example <caption>Generate jpeg dataURL with lower quality</caption>
       * var dataURL = canvas.toDataURL({
       *   format: 'jpeg',
       *   quality: 0.8
       * });
       * @example <caption>Generate cropped png dataURL (clipping of canvas)</caption>
       * var dataURL = canvas.toDataURL({
       *   format: 'png',
       *   left: 100,
       *   top: 100,
       *   width: 200,
       *   height: 200
       * });
       * @example <caption>Generate double scaled png dataURL</caption>
       * var dataURL = canvas.toDataURL({
       *   format: 'png',
       *   multiplier: 2
       * });
       */
      toDataURL: function (options) {
        options || (options = { });

        var format = options.format || 'png',
            quality = options.quality || 1,
            multiplier = options.multiplier || 1,
            cropping = {
              left: options.left,
              top: options.top,
              width: options.width,
              height: options.height
            };

        Iif (this._isRetinaScaling()) {
          multiplier *= fabric.devicePixelRatio;
        }

        Iif (multiplier !== 1) {
          return this.__toDataURLWithMultiplier(format, quality, cropping, multiplier);
        }
        else {
          return this.__toDataURL(format, quality, cropping);
        }
      },

      /**
       * @private
       */
      __toDataURL: function(format, quality, cropping) {

        this.renderAll();

        var canvasEl = this.contextContainer.canvas,
            croppedCanvasEl = this.__getCroppedCanvas(canvasEl, cropping);

        // to avoid common confusion https://github.com/kangax/fabric.js/issues/806
        if (format === 'jpg') {
          format = 'jpeg';
        }

        var data = (fabric.StaticCanvas.supports('toDataURLWithQuality'))
                  ? (croppedCanvasEl || canvasEl).toDataURL('image/' + format, quality)
                  : (croppedCanvasEl || canvasEl).toDataURL('image/' + format);

        Eif (croppedCanvasEl) {
          croppedCanvasEl = null;
        }

        return data;
      },

      /**
       * @private
       */
      __getCroppedCanvas: function(canvasEl, cropping) {

        var croppedCanvasEl,
            croppedCtx,
            shouldCrop = 'left' in cropping ||
                         'top' in cropping ||
                         'width' in cropping ||
                         'height' in cropping;

        Eif (shouldCrop) {

          croppedCanvasEl = fabric.util.createCanvasElement();
          croppedCtx = croppedCanvasEl.getContext('2d');

          croppedCanvasEl.width = cropping.width || this.width;
          croppedCanvasEl.height = cropping.height || this.height;

          croppedCtx.drawImage(canvasEl, -cropping.left || 0, -cropping.top || 0);
        }

        return croppedCanvasEl;
      },

      /**
       * @private
       */
      __toDataURLWithMultiplier: function(format, quality, cropping, multiplier) {

        var origWidth = this.getWidth(),
            origHeight = this.getHeight(),
            scaledWidth = origWidth * multiplier,
            scaledHeight = origHeight * multiplier,
            activeObject = this.getActiveObject(),
            activeGroup = this.getActiveGroup(),
            zoom = this.getZoom(),
            newZoom = zoom * multiplier / fabric.devicePixelRatio;

        if (multiplier > 1) {
          this.setDimensions({ width: scaledWidth, height: scaledHeight });
        }

        this.setZoom(newZoom);

        if (cropping.left) {
          cropping.left *= multiplier;
        }
        if (cropping.top) {
          cropping.top *= multiplier;
        }
        if (cropping.width) {
          cropping.width *= multiplier;
        }
        else if (multiplier < 1) {
          cropping.width = scaledWidth;
        }
        if (cropping.height) {
          cropping.height *= multiplier;
        }
        else if (multiplier < 1) {
          cropping.height = scaledHeight;
        }

        if (activeGroup) {
          // not removing group due to complications with restoring it with correct state afterwords
          this._tempRemoveBordersControlsFromGroup(activeGroup);
        }
        else if (activeObject && this.deactivateAll) {
          this.deactivateAll();
        }

        var data = this.__toDataURL(format, quality, cropping);
        if (activeGroup) {
          this._restoreBordersControlsOnGroup(activeGroup);
        }
        else if (activeObject && this.setActiveObject) {
          this.setActiveObject(activeObject);
        }
        this.setZoom(zoom);
        //setDimensions with no option object is taking care of:
        //this.width, this.height, this.renderAll()
        this.setDimensions({ width: origWidth, height: origHeight });

        return data;
      },

      /**
       * Exports canvas element to a dataurl image (allowing to change image size via multiplier).
       * @deprecated since 1.0.13
       * @param {String} format (png|jpeg)
       * @param {Number} multiplier
       * @param {Number} quality (0..1)
       * @return {String}
       */
      toDataURLWithMultiplier: function (format, multiplier, quality) {
        return this.toDataURL({
          format: format,
          multiplier: multiplier,
          quality: quality
        });
      },

      /**
       * @private
       */
      _tempRemoveBordersControlsFromGroup: function(group) {
        group.origHasControls = group.hasControls;
        group.origBorderColor = group.borderColor;

        group.hasControls = true;
        group.borderColor = 'rgba(0,0,0,0)';

        group.forEachObject(function(o) {
          o.origBorderColor = o.borderColor;
          o.borderColor = 'rgba(0,0,0,0)';
        });
      },

      /**
       * @private
       */
      _restoreBordersControlsOnGroup: function(group) {
        group.hideControls = group.origHideControls;
        group.borderColor = group.origBorderColor;

        group.forEachObject(function(o) {
          o.borderColor = o.origBorderColor;
          delete o.origBorderColor;
        });
      }
    });

    fabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {

      /**
       * Populates canvas with data from the specified dataless JSON.
       * JSON format must conform to the one of {@link fabric.Canvas#toDatalessJSON}
       * @deprecated since 1.2.2
       * @param {String|Object} json JSON string or object
       * @param {Function} callback Callback, invoked when json is parsed
       *                            and corresponding objects (e.g: {@link fabric.Image})
       *                            are initialized
       * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.
       * @return {fabric.Canvas} instance
       * @chainable
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#deserialization}
       */
      loadFromDatalessJSON: function (json, callback, reviver) {
        return this.loadFromJSON(json, callback, reviver);
      },

      /**
       * Populates canvas with data from the specified JSON.
       * JSON format must conform to the one of {@link fabric.Canvas#toJSON}
       * @param {String|Object} json JSON string or object
       * @param {Function} callback Callback, invoked when json is parsed
       *                            and corresponding objects (e.g: {@link fabric.Image})
       *                            are initialized
       * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.
       * @return {fabric.Canvas} instance
       * @chainable
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#deserialization}
       * @see {@link http://jsfiddle.net/fabricjs/fmgXt/|jsFiddle demo}
       * @example <caption>loadFromJSON</caption>
       * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas));
       * @example <caption>loadFromJSON with reviver</caption>
       * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas), function(o, object) {
       *   // `o` = json object
       *   // `object` = fabric.Object instance
       *   // ... do some stuff ...
       * });
       */
      loadFromJSON: function (json, callback, reviver) {
        Iif (!json) {
          return;
        }

        // serialize if it wasn't already
        var serialized = (typeof json === 'string')
          ? JSON.parse(json)
          : fabric.util.object.clone(json);

        this.clear();

        var _this = this;
        this._enlivenObjects(serialized.objects, function () {
          _this._setBgOverlay(serialized, callback);
        }, reviver);
        // remove parts i cannot set as options
        delete serialized.objects;
        delete serialized.backgroundImage;
        delete serialized.overlayImage;
        delete serialized.background;
        delete serialized.overlay;
        // this._initOptions does too many things to just
        // call it. Normally loading an Object from JSON
        // create the Object instance. Here the Canvas is
        // already an instance and we are just loading things over it
        for (var prop in serialized) {
          this[prop] = serialized[prop];
        }
        return this;
      },

      /**
       * @private
       * @param {Object} serialized Object with background and overlay information
       * @param {Function} callback Invoked after all background and overlay images/patterns loaded
       */
      _setBgOverlay: function(serialized, callback) {
        var _this = this,
            loaded = {
              backgroundColor: false,
              overlayColor: false,
              backgroundImage: false,
              overlayImage: false
            };

        if (!serialized.backgroundImage && !serialized.overlayImage && !serialized.background && !serialized.overlay) {
          callback && callback();
          return;
        }

        var cbIfLoaded = function () {
          if (loaded.backgroundImage && loaded.overlayImage && loaded.backgroundColor && loaded.overlayColor) {
            _this.renderAll();
            callback && callback();
          }
        };

        this.__setBgOverlay('backgroundImage', serialized.backgroundImage, loaded, cbIfLoaded);
        this.__setBgOverlay('overlayImage', serialized.overlayImage, loaded, cbIfLoaded);
        this.__setBgOverlay('backgroundColor', serialized.background, loaded, cbIfLoaded);
        this.__setBgOverlay('overlayColor', serialized.overlay, loaded, cbIfLoaded);

        cbIfLoaded();
      },

      /**
       * @private
       * @param {String} property Property to set (backgroundImage, overlayImage, backgroundColor, overlayColor)
       * @param {(Object|String)} value Value to set
       * @param {Object} loaded Set loaded property to true if property is set
       * @param {Object} callback Callback function to invoke after property is set
       */
      __setBgOverlay: function(property, value, loaded, callback) {
        var _this = this;

        if (!value) {
          loaded[property] = true;
          return;
        }

        Iif (property === 'backgroundImage' || property === 'overlayImage') {
          fabric.Image.fromObject(value, function(img) {
            _this[property] = img;
            loaded[property] = true;
            callback && callback();
          });
        }
        else {
          this['set' + fabric.util.string.capitalize(property, true)](value, function() {
            loaded[property] = true;
            callback && callback();
          });
        }
      },

      /**
       * @private
       * @param {Array} objects
       * @param {Function} callback
       * @param {Function} [reviver]
       */
      _enlivenObjects: function (objects, callback, reviver) {
        var _this = this;

        if (!objects || objects.length === 0) {
          callback && callback();
          return;
        }

        var renderOnAddRemove = this.renderOnAddRemove;
        this.renderOnAddRemove = false;

        fabric.util.enlivenObjects(objects, function(enlivenedObjects) {
          enlivenedObjects.forEach(function(obj, index) {
            _this.insertAt(obj, index, true);
          });

          _this.renderOnAddRemove = renderOnAddRemove;
          callback && callback();
        }, null, reviver);
      },

      /**
       * @private
       * @param {String} format
       * @param {Function} callback
       */
      _toDataURL: function (format, callback) {
        this.clone(function (clone) {
          callback(clone.toDataURL(format));
        });
      },

      /**
       * @private
       * @param {String} format
       * @param {Number} multiplier
       * @param {Function} callback
       */
      _toDataURLWithMultiplier: function (format, multiplier, callback) {
        this.clone(function (clone) {
          callback(clone.toDataURLWithMultiplier(format, multiplier));
        });
      },

      /**
       * Clones canvas instance
       * @param {Object} [callback] Receives cloned instance as a first argument
       * @param {Array} [properties] Array of properties to include in the cloned canvas and children
       */
      clone: function (callback, properties) {
        var data = JSON.stringify(this.toJSON(properties));
        this.cloneWithoutData(function(clone) {
          clone.loadFromJSON(data, function() {
            callback && callback(clone);
          });
        });
      },

      /**
       * Clones canvas instance without cloning existing data.
       * This essentially copies canvas dimensions, clipping properties, etc.
       * but leaves data empty (so that you can populate it with your own)
       * @param {Object} [callback] Receives cloned instance as a first argument
       */
      cloneWithoutData: function(callback) {
        var el = fabric.document.createElement('canvas');

        el.width = this.getWidth();
        el.height = this.getHeight();

        var clone = new fabric.Canvas(el);
        clone.clipTo = this.clipTo;
        Iif (this.backgroundImage) {
          clone.setBackgroundImage(this.backgroundImage.src, function() {
            clone.renderAll();
            callback && callback(clone);
          });
          clone.backgroundImageOpacity = this.backgroundImageOpacity;
          clone.backgroundImageStretch = this.backgroundImageStretch;
        }
        else {
          callback && callback(clone);
        }
      }
    });

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          toFixed = fabric.util.toFixed,
          capitalize = fabric.util.string.capitalize,
          degreesToRadians = fabric.util.degreesToRadians,
          supportsLineDash = fabric.StaticCanvas.supports('setLineDash');

      Iif (fabric.Object) {
        return;
      }

      /**
       * Root object class from which all 2d shape classes inherit from
       * @class fabric.Object
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#objects}
       * @see {@link fabric.Object#initialize} for constructor definition
       *
       * @fires added
       * @fires removed
       *
       * @fires selected
       * @fires modified
       * @fires rotating
       * @fires scaling
       * @fires moving
       * @fires skewing
       *
       * @fires mousedown
       * @fires mouseup
       * @fires mouseover
       * @fires mouseout
       */
      fabric.Object = fabric.util.createClass(/** @lends fabric.Object.prototype */ {

        /**
         * Retrieves object's {@link fabric.Object#clipTo|clipping function}
         * @method getClipTo
         * @memberOf fabric.Object.prototype
         * @return {Function}
         */

        /**
         * Sets object's {@link fabric.Object#clipTo|clipping function}
         * @method setClipTo
         * @memberOf fabric.Object.prototype
         * @param {Function} clipTo Clipping function
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#transformMatrix|transformMatrix}
         * @method getTransformMatrix
         * @memberOf fabric.Object.prototype
         * @return {Array} transformMatrix
         */

        /**
         * Sets object's {@link fabric.Object#transformMatrix|transformMatrix}
         * @method setTransformMatrix
         * @memberOf fabric.Object.prototype
         * @param {Array} transformMatrix
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#visible|visible} state
         * @method getVisible
         * @memberOf fabric.Object.prototype
         * @return {Boolean} True if visible
         */

        /**
         * Sets object's {@link fabric.Object#visible|visible} state
         * @method setVisible
         * @memberOf fabric.Object.prototype
         * @param {Boolean} value visible value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#shadow|shadow}
         * @method getShadow
         * @memberOf fabric.Object.prototype
         * @return {Object} Shadow instance
         */

        /**
         * Retrieves object's {@link fabric.Object#stroke|stroke}
         * @method getStroke
         * @memberOf fabric.Object.prototype
         * @return {String} stroke value
         */

        /**
         * Sets object's {@link fabric.Object#stroke|stroke}
         * @method setStroke
         * @memberOf fabric.Object.prototype
         * @param {String} value stroke value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#strokeWidth|strokeWidth}
         * @method getStrokeWidth
         * @memberOf fabric.Object.prototype
         * @return {Number} strokeWidth value
         */

        /**
         * Sets object's {@link fabric.Object#strokeWidth|strokeWidth}
         * @method setStrokeWidth
         * @memberOf fabric.Object.prototype
         * @param {Number} value strokeWidth value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#originX|originX}
         * @method getOriginX
         * @memberOf fabric.Object.prototype
         * @return {String} originX value
         */

        /**
         * Sets object's {@link fabric.Object#originX|originX}
         * @method setOriginX
         * @memberOf fabric.Object.prototype
         * @param {String} value originX value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#originY|originY}
         * @method getOriginY
         * @memberOf fabric.Object.prototype
         * @return {String} originY value
         */

        /**
         * Sets object's {@link fabric.Object#originY|originY}
         * @method setOriginY
         * @memberOf fabric.Object.prototype
         * @param {String} value originY value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#fill|fill}
         * @method getFill
         * @memberOf fabric.Object.prototype
         * @return {String} Fill value
         */

        /**
         * Sets object's {@link fabric.Object#fill|fill}
         * @method setFill
         * @memberOf fabric.Object.prototype
         * @param {String} value Fill value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#opacity|opacity}
         * @method getOpacity
         * @memberOf fabric.Object.prototype
         * @return {Number} Opacity value (0-1)
         */

        /**
         * Sets object's {@link fabric.Object#opacity|opacity}
         * @method setOpacity
         * @memberOf fabric.Object.prototype
         * @param {Number} value Opacity value (0-1)
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#angle|angle} (in degrees)
         * @method getAngle
         * @memberOf fabric.Object.prototype
         * @return {Number}
         */

        /**
         * Retrieves object's {@link fabric.Object#top|top position}
         * @method getTop
         * @memberOf fabric.Object.prototype
         * @return {Number} Top value (in pixels)
         */

        /**
         * Sets object's {@link fabric.Object#top|top position}
         * @method setTop
         * @memberOf fabric.Object.prototype
         * @param {Number} value Top value (in pixels)
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#left|left position}
         * @method getLeft
         * @memberOf fabric.Object.prototype
         * @return {Number} Left value (in pixels)
         */

        /**
         * Sets object's {@link fabric.Object#left|left position}
         * @method setLeft
         * @memberOf fabric.Object.prototype
         * @param {Number} value Left value (in pixels)
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#scaleX|scaleX} value
         * @method getScaleX
         * @memberOf fabric.Object.prototype
         * @return {Number} scaleX value
         */

        /**
         * Sets object's {@link fabric.Object#scaleX|scaleX} value
         * @method setScaleX
         * @memberOf fabric.Object.prototype
         * @param {Number} value scaleX value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#scaleY|scaleY} value
         * @method getScaleY
         * @memberOf fabric.Object.prototype
         * @return {Number} scaleY value
         */

        /**
         * Sets object's {@link fabric.Object#scaleY|scaleY} value
         * @method setScaleY
         * @memberOf fabric.Object.prototype
         * @param {Number} value scaleY value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#flipX|flipX} value
         * @method getFlipX
         * @memberOf fabric.Object.prototype
         * @return {Boolean} flipX value
         */

        /**
         * Sets object's {@link fabric.Object#flipX|flipX} value
         * @method setFlipX
         * @memberOf fabric.Object.prototype
         * @param {Boolean} value flipX value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Retrieves object's {@link fabric.Object#flipY|flipY} value
         * @method getFlipY
         * @memberOf fabric.Object.prototype
         * @return {Boolean} flipY value
         */

        /**
         * Sets object's {@link fabric.Object#flipY|flipY} value
         * @method setFlipY
         * @memberOf fabric.Object.prototype
         * @param {Boolean} value flipY value
         * @return {fabric.Object} thisArg
         * @chainable
         */

        /**
         * Type of an object (rect, circle, path, etc.).
         * Note that this property is meant to be read-only and not meant to be modified.
         * If you modify, certain parts of Fabric (such as JSON loading) won't work correctly.
         * @type String
         * @default
         */
        type:                     'object',

        /**
         * Horizontal origin of transformation of an object (one of "left", "right", "center")
         * See http://jsfiddle.net/1ow02gea/40/ on how originX/originY affect objects in groups
         * @type String
         * @default
         */
        originX:                  'left',

        /**
         * Vertical origin of transformation of an object (one of "top", "bottom", "center")
         * See http://jsfiddle.net/1ow02gea/40/ on how originX/originY affect objects in groups
         * @type String
         * @default
         */
        originY:                  'top',

        /**
         * Top position of an object. Note that by default it's relative to object top. You can change this by setting originY={top/center/bottom}
         * @type Number
         * @default
         */
        top:                      0,

        /**
         * Left position of an object. Note that by default it's relative to object left. You can change this by setting originX={left/center/right}
         * @type Number
         * @default
         */
        left:                     0,

        /**
         * Object width
         * @type Number
         * @default
         */
        width:                    0,

        /**
         * Object height
         * @type Number
         * @default
         */
        height:                   0,

        /**
         * Object scale factor (horizontal)
         * @type Number
         * @default
         */
        scaleX:                   1,

        /**
         * Object scale factor (vertical)
         * @type Number
         * @default
         */
        scaleY:                   1,

        /**
         * When true, an object is rendered as flipped horizontally
         * @type Boolean
         * @default
         */
        flipX:                    false,

        /**
         * When true, an object is rendered as flipped vertically
         * @type Boolean
         * @default
         */
        flipY:                    false,

        /**
         * Opacity of an object
         * @type Number
         * @default
         */
        opacity:                  1,

        /**
         * Angle of rotation of an object (in degrees)
         * @type Number
         * @default
         */
        angle:                    0,

        /**
         * Angle of skew on x axes of an object (in degrees)
         * @type Number
         * @default
         */
        skewX:                    0,

        /**
         * Angle of skew on y axes of an object (in degrees)
         * @type Number
         * @default
         */
        skewY:                    0,

        /**
         * Size of object's controlling corners (in pixels)
         * @type Number
         * @default
         */
        cornerSize:               13,

        /**
         * When true, object's controlling corners are rendered as transparent inside (i.e. stroke instead of fill)
         * @type Boolean
         * @default
         */
        transparentCorners:       true,

        /**
         * Default cursor value used when hovering over this object on canvas
         * @type String
         * @default
         */
        hoverCursor:              null,

        /**
         * Default cursor value used when moving this object on canvas
         * @type String
         * @default
         */
        moveCursor:               null,

        /**
         * Padding between object and its controlling borders (in pixels)
         * @type Number
         * @default
         */
        padding:                  0,

        /**
         * Color of controlling borders of an object (when it's active)
         * @type String
         * @default
         */
        borderColor:              'rgba(102,153,255,0.75)',

        /**
         * Array specifying dash pattern of an object's borders (hasBorder must be true)
         * @since 1.6.2
         * @type Array
         */
        borderDashArray:          null,

        /**
         * Color of controlling corners of an object (when it's active)
         * @type String
         * @default
         */
        cornerColor:              'rgba(102,153,255,0.5)',

        /**
         * Color of controlling corners of an object (when it's active and transparentCorners false)
         * @since 1.6.2
         * @type String
         * @default
         */
        cornerStrokeColor:        null,

        /**
         * Specify style of control, 'rect' or 'circle'
         * @since 1.6.2
         * @type String
         */
        cornerStyle:          'rect',

        /**
         * Array specifying dash pattern of an object's control (hasBorder must be true)
         * @since 1.6.2
         * @type Array
         */
        cornerDashArray:          null,

        /**
         * When true, this object will use center point as the origin of transformation
         * when being scaled via the controls.
         * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
         * @since 1.3.4
         * @type Boolean
         * @default
         */
        centeredScaling:          false,

        /**
         * When true, this object will use center point as the origin of transformation
         * when being rotated via the controls.
         * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
         * @since 1.3.4
         * @type Boolean
         * @default
         */
        centeredRotation:         true,

        /**
         * Color of object's fill
         * @type String
         * @default
         */
        fill:                     'rgb(0,0,0)',

        /**
         * Fill rule used to fill an object
         * accepted values are nonzero, evenodd
         * <b>Backwards incompatibility note:</b> This property was used for setting globalCompositeOperation until v1.4.12 (use `fabric.Object#globalCompositeOperation` instead)
         * @type String
         * @default
         */
        fillRule:                 'nonzero',

        /**
         * Composite rule used for canvas globalCompositeOperation
         * @type String
         * @default
         */
        globalCompositeOperation: 'source-over',

        /**
         * Background color of an object. Only works with text objects at the moment.
         * @type String
         * @default
         */
        backgroundColor:          '',

        /**
         * Selection Background color of an object. colored layer behind the object when it is active.
         * does not mix good with globalCompositeOperation methods.
         * @type String
         * @default
         */
        selectionBackgroundColor:          '',

        /**
         * When defined, an object is rendered via stroke and this property specifies its color
         * @type String
         * @default
         */
        stroke:                   null,

        /**
         * Width of a stroke used to render this object
         * @type Number
         * @default
         */
        strokeWidth:              1,

        /**
         * Array specifying dash pattern of an object's stroke (stroke must be defined)
         * @type Array
         */
        strokeDashArray:          null,

        /**
         * Line endings style of an object's stroke (one of "butt", "round", "square")
         * @type String
         * @default
         */
        strokeLineCap:            'butt',

        /**
         * Corner style of an object's stroke (one of "bevil", "round", "miter")
         * @type String
         * @default
         */
        strokeLineJoin:           'miter',

        /**
         * Maximum miter length (used for strokeLineJoin = "miter") of an object's stroke
         * @type Number
         * @default
         */
        strokeMiterLimit:         10,

        /**
         * Shadow object representing shadow of this shape
         * @type fabric.Shadow
         * @default
         */
        shadow:                   null,

        /**
         * Opacity of object's controlling borders when object is active and moving
         * @type Number
         * @default
         */
        borderOpacityWhenMoving:  0.4,

        /**
         * Scale factor of object's controlling borders
         * @type Number
         * @default
         */
        borderScaleFactor:        1,

        /**
         * Transform matrix (similar to SVG's transform matrix)
         * @type Array
         */
        transformMatrix:          null,

        /**
         * Minimum allowed scale value of an object
         * @type Number
         * @default
         */
        minScaleLimit:            0.01,

        /**
         * When set to `false`, an object can not be selected for modification (using either point-click-based or group-based selection).
         * But events still fire on it.
         * @type Boolean
         * @default
         */
        selectable:               true,

        /**
         * When set to `false`, an object can not be a target of events. All events propagate through it. Introduced in v1.3.4
         * @type Boolean
         * @default
         */
        evented:                  true,

        /**
         * When set to `false`, an object is not rendered on canvas
         * @type Boolean
         * @default
         */
        visible:                  true,

        /**
         * When set to `false`, object's controls are not displayed and can not be used to manipulate object
         * @type Boolean
         * @default
         */
        hasControls:              true,

        /**
         * When set to `false`, object's controlling borders are not rendered
         * @type Boolean
         * @default
         */
        hasBorders:               true,

        /**
         * When set to `false`, object's controlling rotating point will not be visible or selectable
         * @type Boolean
         * @default
         */
        hasRotatingPoint:         true,

        /**
         * Offset for object's controlling rotating point (when enabled via `hasRotatingPoint`)
         * @type Number
         * @default
         */
        rotatingPointOffset:      40,

        /**
         * When set to `true`, objects are "found" on canvas on per-pixel basis rather than according to bounding box
         * @type Boolean
         * @default
         */
        perPixelTargetFind:       false,

        /**
         * When `false`, default object's values are not included in its serialization
         * @type Boolean
         * @default
         */
        includeDefaultValues:     true,

        /**
         * Function that determines clipping of an object (context is passed as a first argument)
         * Note that context origin is at the object's center point (not left/top corner)
         * @type Function
         */
        clipTo:                   null,

        /**
         * When `true`, object horizontal movement is locked
         * @type Boolean
         * @default
         */
        lockMovementX:            false,

        /**
         * When `true`, object vertical movement is locked
         * @type Boolean
         * @default
         */
        lockMovementY:            false,

        /**
         * When `true`, object rotation is locked
         * @type Boolean
         * @default
         */
        lockRotation:             false,

        /**
         * When `true`, object horizontal scaling is locked
         * @type Boolean
         * @default
         */
        lockScalingX:             false,

        /**
         * When `true`, object vertical scaling is locked
         * @type Boolean
         * @default
         */
        lockScalingY:             false,

        /**
         * When `true`, object non-uniform scaling is locked
         * @type Boolean
         * @default
         */
        lockUniScaling:           false,

        /**
         * When `true`, object horizontal skewing is locked
         * @type Boolean
         * @default
         */
        lockSkewingX:             false,

        /**
         * When `true`, object vertical skewing is locked
         * @type Boolean
         * @default
         */
        lockSkewingY:             false,

        /**
         * When `true`, object cannot be flipped by scaling into negative values
         * @type Boolean
         * @default
         */

        lockScalingFlip:          false,
        /**
         * List of properties to consider when checking if state
         * of an object is changed (fabric.Object#hasStateChanged)
         * as well as for history (undo/redo) purposes
         * @type Array
         */
        stateProperties:  (
          'top left width height scaleX scaleY flipX flipY originX originY transformMatrix ' +
          'stroke strokeWidth strokeDashArray strokeLineCap strokeLineJoin strokeMiterLimit ' +
          'angle opacity fill fillRule globalCompositeOperation shadow clipTo visible backgroundColor ' +
          'alignX alignY meetOrSlice skewX skewY'
        ).split(' '),

        /**
         * Constructor
         * @param {Object} [options] Options object
         */
        initialize: function(options) {
          if (options) {
            this.setOptions(options);
          }
        },

        /**
         * @private
         * @param {Object} [options] Options object
         */
        _initGradient: function(options) {
          if (options.fill && options.fill.colorStops && !(options.fill instanceof fabric.Gradient)) {
            this.set('fill', new fabric.Gradient(options.fill));
          }
          if (options.stroke && options.stroke.colorStops && !(options.stroke instanceof fabric.Gradient)) {
            this.set('stroke', new fabric.Gradient(options.stroke));
          }
        },

        /**
         * @private
         * @param {Object} [options] Options object
         */
        _initPattern: function(options) {
          Iif (options.fill && options.fill.source && !(options.fill instanceof fabric.Pattern)) {
            this.set('fill', new fabric.Pattern(options.fill));
          }
          Iif (options.stroke && options.stroke.source && !(options.stroke instanceof fabric.Pattern)) {
            this.set('stroke', new fabric.Pattern(options.stroke));
          }
        },

        /**
         * @private
         * @param {Object} [options] Options object
         */
        _initClipping: function(options) {
          if (!options.clipTo || typeof options.clipTo !== 'string') {
            return;
          }

          var functionBody = fabric.util.getFunctionBody(options.clipTo);
          Eif (typeof functionBody !== 'undefined') {
            this.clipTo = new Function('ctx', functionBody);
          }
        },

        /**
         * Sets object's properties from options
         * @param {Object} [options] Options object
         */
        setOptions: function(options) {
          for (var prop in options) {
            this.set(prop, options[prop]);
          }
          this._initGradient(options);
          this._initPattern(options);
          this._initClipping(options);
        },

        /**
         * Transforms context when rendering an object
         * @param {CanvasRenderingContext2D} ctx Context
         * @param {Boolean} fromLeft When true, context is transformed to object's top/left corner. This is used when rendering text on Node
         */
        transform: function(ctx, fromLeft) {
          Iif (this.group && this.canvas.preserveObjectStacking && this.group === this.canvas._activeGroup) {
            this.group.transform(ctx);
          }
          var center = fromLeft ? this._getLeftTopCoords() : this.getCenterPoint();
          ctx.translate(center.x, center.y);
          ctx.rotate(degreesToRadians(this.angle));
          ctx.scale(
            this.scaleX * (this.flipX ? -1 : 1),
            this.scaleY * (this.flipY ? -1 : 1)
          );
          ctx.transform(1, 0, Math.tan(degreesToRadians(this.skewX)), 1, 0, 0);
          ctx.transform(1, Math.tan(degreesToRadians(this.skewY)), 0, 1, 0, 0);
        },

        /**
         * Returns an object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} Object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,

              object = {
                type:                     this.type,
                originX:                  this.originX,
                originY:                  this.originY,
                left:                     toFixed(this.left, NUM_FRACTION_DIGITS),
                top:                      toFixed(this.top, NUM_FRACTION_DIGITS),
                width:                    toFixed(this.width, NUM_FRACTION_DIGITS),
                height:                   toFixed(this.height, NUM_FRACTION_DIGITS),
                fill:                     (this.fill && this.fill.toObject) ? this.fill.toObject() : this.fill,
                stroke:                   (this.stroke && this.stroke.toObject) ? this.stroke.toObject() : this.stroke,
                strokeWidth:              toFixed(this.strokeWidth, NUM_FRACTION_DIGITS),
                strokeDashArray:          this.strokeDashArray ? this.strokeDashArray.concat() : this.strokeDashArray,
                strokeLineCap:            this.strokeLineCap,
                strokeLineJoin:           this.strokeLineJoin,
                strokeMiterLimit:         toFixed(this.strokeMiterLimit, NUM_FRACTION_DIGITS),
                scaleX:                   toFixed(this.scaleX, NUM_FRACTION_DIGITS),
                scaleY:                   toFixed(this.scaleY, NUM_FRACTION_DIGITS),
                angle:                    toFixed(this.getAngle(), NUM_FRACTION_DIGITS),
                flipX:                    this.flipX,
                flipY:                    this.flipY,
                opacity:                  toFixed(this.opacity, NUM_FRACTION_DIGITS),
                shadow:                   (this.shadow && this.shadow.toObject) ? this.shadow.toObject() : this.shadow,
                visible:                  this.visible,
                clipTo:                   this.clipTo && String(this.clipTo),
                backgroundColor:          this.backgroundColor,
                fillRule:                 this.fillRule,
                globalCompositeOperation: this.globalCompositeOperation,
                transformMatrix:          this.transformMatrix ? this.transformMatrix.concat() : this.transformMatrix,
                skewX:                    toFixed(this.skewX, NUM_FRACTION_DIGITS),
                skewY:                    toFixed(this.skewY, NUM_FRACTION_DIGITS)
              };

          if (!this.includeDefaultValues) {
            object = this._removeDefaultValues(object);
          }

          fabric.util.populateWithProperties(this, object, propertiesToInclude);

          return object;
        },

        /**
         * Returns (dataless) object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} Object representation of an instance
         */
        toDatalessObject: function(propertiesToInclude) {
          // will be overwritten by subclasses
          return this.toObject(propertiesToInclude);
        },

        /**
         * @private
         * @param {Object} object
         */
        _removeDefaultValues: function(object) {
          var prototype = fabric.util.getKlass(object.type).prototype,
              stateProperties = prototype.stateProperties;

          stateProperties.forEach(function(prop) {
            if (object[prop] === prototype[prop]) {
              delete object[prop];
            }
            var isArray = Object.prototype.toString.call(object[prop]) === '[object Array]' &&
                          Object.prototype.toString.call(prototype[prop]) === '[object Array]';

            // basically a check for [] === []
            Iif (isArray && object[prop].length === 0 && prototype[prop].length === 0) {
              delete object[prop];
            }
          });

          return object;
        },

        /**
         * Returns a string representation of an instance
         * @return {String}
         */
        toString: function() {
          return '#<fabric.' + capitalize(this.type) + '>';
        },

        /**
         * Basic getter
         * @param {String} property Property name
         * @return {Any} value of a property
         */
        get: function(property) {
          return this[property];
        },

        /**
         * @private
         */
        _setObject: function(obj) {
          for (var prop in obj) {
            this._set(prop, obj[prop]);
          }
        },

        /**
         * Sets property to a given value. When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls. If you need to update those, call `setCoords()`.
         * @param {String|Object} key Property name or object (if object, iterate over the object properties)
         * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)
         * @return {fabric.Object} thisArg
         * @chainable
         */
        set: function(key, value) {
          if (typeof key === 'object') {
            this._setObject(key);
          }
          else {
            if (typeof value === 'function' && key !== 'clipTo') {
              this._set(key, value(this.get(key)));
            }
            else {
              this._set(key, value);
            }
          }
          return this;
        },

        /**
         * @private
         * @param {String} key
         * @param {Any} value
         * @return {fabric.Object} thisArg
         */
        _set: function(key, value) {
          var shouldConstrainValue = (key === 'scaleX' || key === 'scaleY');

          if (shouldConstrainValue) {
            value = this._constrainScale(value);
          }
          Iif (key === 'scaleX' && value < 0) {
            this.flipX = !this.flipX;
            value *= -1;
          }
          else Iif (key === 'scaleY' && value < 0) {
            this.flipY = !this.flipY;
            value *= -1;
          }
          else if (key === 'shadow' && value && !(value instanceof fabric.Shadow)) {
            value = new fabric.Shadow(value);
          }

          this[key] = value;

          if (key === 'width' || key === 'height') {
            this.minScaleLimit = Math.min(0.1, 1/Math.max(this.width, this.height));
          }

          return this;
        },

        /**
         * This callback function is called by the parent group of an object every
         * time a non-delegated property changes on the group. It is passed the key
         * and value as parameters. Not adding in this function's signature to avoid
         * Travis build error about unused variables.
         */
        setOnGroup: function() {
          // implemented by sub-classes, as needed.
        },

        /**
         * Toggles specified property from `true` to `false` or from `false` to `true`
         * @param {String} property Property to toggle
         * @return {fabric.Object} thisArg
         * @chainable
         */
        toggle: function(property) {
          var value = this.get(property);
          if (typeof value === 'boolean') {
            this.set(property, !value);
          }
          return this;
        },

        /**
         * Sets sourcePath of an object
         * @param {String} value Value to set sourcePath to
         * @return {fabric.Object} thisArg
         * @chainable
         */
        setSourcePath: function(value) {
          this.sourcePath = value;
          return this;
        },

        /**
         * Retrieves viewportTransform from Object's canvas if possible
         * @method getViewportTransform
         * @memberOf fabric.Object.prototype
         * @return {Boolean} flipY value // TODO
         */
        getViewportTransform: function() {
          if (this.canvas && this.canvas.viewportTransform) {
            return this.canvas.viewportTransform;
          }
          return [1, 0, 0, 1, 0, 0];
        },

        /**
         * Renders an object on a specified context
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Boolean} [noTransform] When true, context is not transformed
         */
        render: function(ctx, noTransform) {
          // do not render if width/height are zeros or object is not visible
          if ((this.width === 0 && this.height === 0) || !this.visible) {
            return;
          }

          ctx.save();

          //setup fill rule for current object
          this._setupCompositeOperation(ctx);
          this.drawSelectionBackground(ctx);
          Eif (!noTransform) {
            this.transform(ctx);
          }
          this._setStrokeStyles(ctx);
          this._setFillStyles(ctx);
          Iif (this.transformMatrix) {
            ctx.transform.apply(ctx, this.transformMatrix);
          }
          this._setOpacity(ctx);
          this._setShadow(ctx);
          this.clipTo && fabric.util.clipContext(this, ctx);
          this._render(ctx, noTransform);
          this.clipTo && ctx.restore();

          ctx.restore();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _setOpacity: function(ctx) {
          if (this.group) {
            this.group._setOpacity(ctx);
          }
          ctx.globalAlpha *= this.opacity;
        },

        _setStrokeStyles: function(ctx) {
          if (this.stroke) {
            ctx.lineWidth = this.strokeWidth;
            ctx.lineCap = this.strokeLineCap;
            ctx.lineJoin = this.strokeLineJoin;
            ctx.miterLimit = this.strokeMiterLimit;
            ctx.strokeStyle = this.stroke.toLive
              ? this.stroke.toLive(ctx, this)
              : this.stroke;
          }
        },

        _setFillStyles: function(ctx) {
          Eif (this.fill) {
            ctx.fillStyle = this.fill.toLive
              ? this.fill.toLive(ctx, this)
              : this.fill;
          }
        },

        /**
         * @private
         * Sets line dash
         * @param {CanvasRenderingContext2D} ctx Context to set the dash line on
         * @param {Array} dashArray array representing dashes
         * @param {Function} alternative function to call if browaser does not support lineDash
         */
        _setLineDash: function(ctx, dashArray, alternative) {
          if (!dashArray) {
            return;
          }
          // Spec requires the concatenation of two copies the dash list when the number of elements is odd
          Eif (1 & dashArray.length) {
            dashArray.push.apply(dashArray, dashArray);
          }
          Eif (supportsLineDash) {
            ctx.setLineDash(dashArray);
          }
          else {
            alternative && alternative(ctx);
          }
        },

        /**
         * Renders controls and borders for the object
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Boolean} [noTransform] When true, context is not transformed
         */
        _renderControls: function(ctx, noTransform) {
          if (!this.active || noTransform
              || (this.group && this.group !== this.canvas.getActiveGroup())) {
            return;
          }

          var vpt = this.getViewportTransform(),
              matrix = this.calcTransformMatrix(),
              options;
          matrix = fabric.util.multiplyTransformMatrices(vpt, matrix);
          options = fabric.util.qrDecompose(matrix);

          ctx.save();
          ctx.translate(options.translateX, options.translateY);
          ctx.lineWidth = 1 / this.borderScaleFactor;
          ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;

          Iif (this.group && this.group === this.canvas.getActiveGroup()) {
            ctx.rotate(degreesToRadians(options.angle));
            this.drawBordersInGroup(ctx, options);
          }
          else {
            ctx.rotate(degreesToRadians(this.angle));
            this.drawBorders(ctx);
          }
          this.drawControls(ctx);
          ctx.restore();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _setShadow: function(ctx) {
          Eif (!this.shadow) {
            return;
          }

          var multX = (this.canvas && this.canvas.viewportTransform[0]) || 1,
              multY = (this.canvas && this.canvas.viewportTransform[3]) || 1;
          if (this.canvas && this.canvas._isRetinaScaling()) {
            multX *= fabric.devicePixelRatio;
            multY *= fabric.devicePixelRatio;
          }
          ctx.shadowColor = this.shadow.color;
          ctx.shadowBlur = this.shadow.blur * (multX + multY) * (this.scaleX + this.scaleY) / 4;
          ctx.shadowOffsetX = this.shadow.offsetX * multX * this.scaleX;
          ctx.shadowOffsetY = this.shadow.offsetY * multY * this.scaleY;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _removeShadow: function(ctx) {
          if (!this.shadow) {
            return;
          }

          ctx.shadowColor = '';
          ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderFill: function(ctx) {
          Iif (!this.fill) {
            return;
          }

          ctx.save();
          Iif (this.fill.gradientTransform) {
            var g = this.fill.gradientTransform;
            ctx.transform.apply(ctx, g);
          }
          Iif (this.fill.toLive) {
            ctx.translate(
              -this.width / 2 + this.fill.offsetX || 0,
              -this.height / 2 + this.fill.offsetY || 0);
          }
          Iif (this.fillRule === 'evenodd') {
            ctx.fill('evenodd');
          }
          else {
            ctx.fill();
          }
          ctx.restore();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderStroke: function(ctx) {
          if (!this.stroke || this.strokeWidth === 0) {
            return;
          }

          Iif (this.shadow && !this.shadow.affectStroke) {
            this._removeShadow(ctx);
          }

          ctx.save();

          this._setLineDash(ctx, this.strokeDashArray, this._renderDashedStroke);
          Iif (this.stroke.gradientTransform) {
            var g = this.stroke.gradientTransform;
            ctx.transform.apply(ctx, g);
          }
          Iif (this.stroke.toLive) {
            ctx.translate(
              -this.width / 2 + this.stroke.offsetX || 0,
              -this.height / 2 + this.stroke.offsetY || 0);
          }
          ctx.stroke();
          ctx.restore();
        },

        /**
         * Clones an instance
         * @param {Function} callback Callback is invoked with a clone as a first argument
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {fabric.Object} clone of an instance
         */
        clone: function(callback, propertiesToInclude) {
          if (this.constructor.fromObject) {
            return this.constructor.fromObject(this.toObject(propertiesToInclude), callback);
          }
          return new fabric.Object(this.toObject(propertiesToInclude));
        },

        /**
         * Creates an instance of fabric.Image out of an object
         * @param {Function} callback callback, invoked with an instance as a first argument
         * @return {fabric.Object} thisArg
         */
        cloneAsImage: function(callback) {
          var dataUrl = this.toDataURL();
          fabric.util.loadImage(dataUrl, function(img) {
            Eif (callback) {
              callback(new fabric.Image(img));
            }
          });
          return this;
        },

        /**
         * Converts an object into a data-url-like string
         * @param {Object} options Options object
         * @param {String} [options.format=png] The format of the output image. Either "jpeg" or "png"
         * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.
         * @param {Number} [options.multiplier=1] Multiplier to scale by
         * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14
         * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14
         * @param {Number} [options.width] Cropping width. Introduced in v1.2.14
         * @param {Number} [options.height] Cropping height. Introduced in v1.2.14
         * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format
         */
        toDataURL: function(options) {
          options || (options = { });

          var el = fabric.util.createCanvasElement(),
              boundingRect = this.getBoundingRect();

          el.width = boundingRect.width;
          el.height = boundingRect.height;

          fabric.util.wrapElement(el, 'div');
          var canvas = new fabric.StaticCanvas(el);

          // to avoid common confusion https://github.com/kangax/fabric.js/issues/806
          Iif (options.format === 'jpg') {
            options.format = 'jpeg';
          }

          if (options.format === 'jpeg') {
            canvas.backgroundColor = '#fff';
          }

          var origParams = {
            active: this.get('active'),
            left: this.getLeft(),
            top: this.getTop()
          };

          this.set('active', false);
          this.setPositionByOrigin(new fabric.Point(canvas.getWidth() / 2, canvas.getHeight() / 2), 'center', 'center');

          var originalCanvas = this.canvas;
          canvas.add(this);
          var data = canvas.toDataURL(options);

          this.set(origParams).setCoords();
          this.canvas = originalCanvas;

          canvas.dispose();
          canvas = null;

          return data;
        },

        /**
         * Returns true if specified type is identical to the type of an instance
         * @param {String} type Type to check against
         * @return {Boolean}
         */
        isType: function(type) {
          return this.type === type;
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return 0;
        },

        /**
         * Returns a JSON representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} JSON
         */
        toJSON: function(propertiesToInclude) {
          // delegate, not alias
          return this.toObject(propertiesToInclude);
        },

        /**
         * Sets gradient (fill or stroke) of an object
         * <b>Backwards incompatibility note:</b> This method was named "setGradientFill" until v1.1.0
         * @param {String} property Property name 'stroke' or 'fill'
         * @param {Object} [options] Options object
         * @param {String} [options.type] Type of gradient 'radial' or 'linear'
         * @param {Number} [options.x1=0] x-coordinate of start point
         * @param {Number} [options.y1=0] y-coordinate of start point
         * @param {Number} [options.x2=0] x-coordinate of end point
         * @param {Number} [options.y2=0] y-coordinate of end point
         * @param {Number} [options.r1=0] Radius of start point (only for radial gradients)
         * @param {Number} [options.r2=0] Radius of end point (only for radial gradients)
         * @param {Object} [options.colorStops] Color stops object eg. {0: 'ff0000', 1: '000000'}
         * @param {Object} [options.gradientTransform] transforMatrix for gradient
         * @return {fabric.Object} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/58y8b/|jsFiddle demo}
         * @example <caption>Set linear gradient</caption>
         * object.setGradient('fill', {
         *   type: 'linear',
         *   x1: -object.width / 2,
         *   y1: 0,
         *   x2: object.width / 2,
         *   y2: 0,
         *   colorStops: {
         *     0: 'red',
         *     0.5: '#005555',
         *     1: 'rgba(0,0,255,0.5)'
         *   }
         * });
         * canvas.renderAll();
         * @example <caption>Set radial gradient</caption>
         * object.setGradient('fill', {
         *   type: 'radial',
         *   x1: 0,
         *   y1: 0,
         *   x2: 0,
         *   y2: 0,
         *   r1: object.width / 2,
         *   r2: 10,
         *   colorStops: {
         *     0: 'red',
         *     0.5: '#005555',
         *     1: 'rgba(0,0,255,0.5)'
         *   }
         * });
         * canvas.renderAll();
         */
        setGradient: function(property, options) {
          options || (options = { });

          var gradient = { colorStops: [] };

          gradient.type = options.type || (options.r1 || options.r2 ? 'radial' : 'linear');
          gradient.coords = {
            x1: options.x1,
            y1: options.y1,
            x2: options.x2,
            y2: options.y2
          };

          Iif (options.r1 || options.r2) {
            gradient.coords.r1 = options.r1;
            gradient.coords.r2 = options.r2;
          }

          options.gradientTransform && (gradient.gradientTransform = options.gradientTransform);

          for (var position in options.colorStops) {
            var color = new fabric.Color(options.colorStops[position]);
            gradient.colorStops.push({
              offset: position,
              color: color.toRgb(),
              opacity: color.getAlpha()
            });
          }

          return this.set(property, fabric.Gradient.forObject(this, gradient));
        },

        /**
         * Sets pattern fill of an object
         * @param {Object} options Options object
         * @param {(String|HTMLImageElement)} options.source Pattern source
         * @param {String} [options.repeat=repeat] Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat)
         * @param {Number} [options.offsetX=0] Pattern horizontal offset from object's left/top corner
         * @param {Number} [options.offsetY=0] Pattern vertical offset from object's left/top corner
         * @return {fabric.Object} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/QT3pa/|jsFiddle demo}
         * @example <caption>Set pattern</caption>
         * fabric.util.loadImage('http://fabricjs.com/assets/escheresque_ste.png', function(img) {
         *   object.setPatternFill({
         *     source: img,
         *     repeat: 'repeat'
         *   });
         *   canvas.renderAll();
         * });
         */
        setPatternFill: function(options) {
          return this.set('fill', new fabric.Pattern(options));
        },

        /**
         * Sets {@link fabric.Object#shadow|shadow} of an object
         * @param {Object|String} [options] Options object or string (e.g. "2px 2px 10px rgba(0,0,0,0.2)")
         * @param {String} [options.color=rgb(0,0,0)] Shadow color
         * @param {Number} [options.blur=0] Shadow blur
         * @param {Number} [options.offsetX=0] Shadow horizontal offset
         * @param {Number} [options.offsetY=0] Shadow vertical offset
         * @return {fabric.Object} thisArg
         * @chainable
         * @see {@link http://jsfiddle.net/fabricjs/7gvJG/|jsFiddle demo}
         * @example <caption>Set shadow with string notation</caption>
         * object.setShadow('2px 2px 10px rgba(0,0,0,0.2)');
         * canvas.renderAll();
         * @example <caption>Set shadow with object notation</caption>
         * object.setShadow({
         *   color: 'red',
         *   blur: 10,
         *   offsetX: 20,
         *   offsetY: 20
         * });
         * canvas.renderAll();
         */
        setShadow: function(options) {
          return this.set('shadow', options ? new fabric.Shadow(options) : null);
        },

        /**
         * Sets "color" of an instance (alias of `set('fill', &hellip;)`)
         * @param {String} color Color value
         * @return {fabric.Object} thisArg
         * @chainable
         */
        setColor: function(color) {
          this.set('fill', color);
          return this;
        },

        /**
         * Sets "angle" of an instance
         * @param {Number} angle Angle value (in degrees)
         * @return {fabric.Object} thisArg
         * @chainable
         */
        setAngle: function(angle) {
          var shouldCenterOrigin = (this.originX !== 'center' || this.originY !== 'center') && this.centeredRotation;

          Eif (shouldCenterOrigin) {
            this._setOriginToCenter();
          }

          this.set('angle', angle);

          Eif (shouldCenterOrigin) {
            this._resetOrigin();
          }

          return this;
        },

        /**
         * Centers object horizontally on canvas to which it was added last.
         * You might need to call `setCoords` on an object after centering, to update controls area.
         * @return {fabric.Object} thisArg
         * @chainable
         */
        centerH: function () {
          this.canvas.centerObjectH(this);
          return this;
        },

        /**
         * Centers object vertically on canvas to which it was added last.
         * You might need to call `setCoords` on an object after centering, to update controls area.
         * @return {fabric.Object} thisArg
         * @chainable
         */
        centerV: function () {
          this.canvas.centerObjectV(this);
          return this;
        },

        /**
         * Centers object vertically and horizontally on canvas to which is was added last
         * You might need to call `setCoords` on an object after centering, to update controls area.
         * @return {fabric.Object} thisArg
         * @chainable
         */
        center: function () {
          this.canvas.centerObject(this);
          return this;
        },

        /**
         * Removes object from canvas to which it was added last
         * @return {fabric.Object} thisArg
         * @chainable
         */
        remove: function() {
          this.canvas.remove(this);
          return this;
        },

        /**
         * Returns coordinates of a pointer relative to an object
         * @param {Event} e Event to operate upon
         * @param {Object} [pointer] Pointer to operate upon (instead of event)
         * @return {Object} Coordinates of a pointer (x, y)
         */
        getLocalPointer: function(e, pointer) {
          pointer = pointer || this.canvas.getPointer(e);
          var pClicked = new fabric.Point(pointer.x, pointer.y),
              objectLeftTop = this._getLeftTopCoords();
          if (this.angle) {
            pClicked = fabric.util.rotatePoint(
              pClicked, objectLeftTop, fabric.util.degreesToRadians(-this.angle));
          }
          return {
            x: pClicked.x - objectLeftTop.x,
            y: pClicked.y - objectLeftTop.y
          };
        },

        /**
         * Sets canvas globalCompositeOperation for specific object
         * custom composition operation for the particular object can be specifed using globalCompositeOperation property
         * @param {CanvasRenderingContext2D} ctx Rendering canvas context
         */
        _setupCompositeOperation: function (ctx) {
          Eif (this.globalCompositeOperation) {
            ctx.globalCompositeOperation = this.globalCompositeOperation;
          }
        }
      });

      fabric.util.createAccessors(fabric.Object);

      /**
       * Alias for {@link fabric.Object.prototype.setAngle}
       * @alias rotate -> setAngle
       * @memberOf fabric.Object
       */
      fabric.Object.prototype.rotate = fabric.Object.prototype.setAngle;

      extend(fabric.Object.prototype, fabric.Observable);

      /**
       * Defines the number of fraction digits to use when serializing object values.
       * You can use it to increase/decrease precision of such values like left, top, scaleX, scaleY, etc.
       * @static
       * @memberOf fabric.Object
       * @constant
       * @type Number
       */
      fabric.Object.NUM_FRACTION_DIGITS = 2;

      /**
       * Unique id used internally when creating SVG elements
       * @static
       * @memberOf fabric.Object
       * @type Number
       */
      fabric.Object.__uid = 0;

    })(typeof exports !== 'undefined' ? exports : this);

    (function() {

      var degreesToRadians = fabric.util.degreesToRadians,
          originXOffset = {
            left: -0.5,
            center: 0,
            right: 0.5
          },
          originYOffset = {
            top: -0.5,
            center: 0,
            bottom: 0.5
          };

      fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {

        /**
         * Translates the coordinates from origin to center coordinates (based on the object's dimensions)
         * @param {fabric.Point} point The point which corresponds to the originX and originY params
         * @param {String} fromOriginX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} fromOriginY Vertical origin: 'top', 'center' or 'bottom'
         * @param {String} toOriginX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} toOriginY Vertical origin: 'top', 'center' or 'bottom'
         * @return {fabric.Point}
         */
        translateToGivenOrigin: function(point, fromOriginX, fromOriginY, toOriginX, toOriginY) {
          var x = point.x,
              y = point.y,
              offsetX = originXOffset[toOriginX] - originXOffset[fromOriginX],
              offsetY = originYOffset[toOriginY] - originYOffset[fromOriginY],
              dim;
          if (offsetX || offsetY) {
            dim = this._getTransformedDimensions();
            x = point.x + offsetX * dim.x;
            y = point.y + offsetY * dim.y;
          }
          return new fabric.Point(x, y);
        },

        /**
         * Translates the coordinates from origin to center coordinates (based on the object's dimensions)
         * @param {fabric.Point} point The point which corresponds to the originX and originY params
         * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
         * @return {fabric.Point}
         */
        translateToCenterPoint: function(point, originX, originY) {
          var p = this.translateToGivenOrigin(point, originX, originY, 'center', 'center');
          if (this.angle) {
            return fabric.util.rotatePoint(p, point, degreesToRadians(this.angle));
          }
          return p;
        },

        /**
         * Translates the coordinates from center to origin coordinates (based on the object's dimensions)
         * @param {fabric.Point} center The point which corresponds to center of the object
         * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
         * @return {fabric.Point}
         */
        translateToOriginPoint: function(center, originX, originY) {
          var p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);
          if (this.angle) {
            return fabric.util.rotatePoint(p, center, degreesToRadians(this.angle));
          }
          return p;
        },

        /**
         * Returns the real center coordinates of the object
         * @return {fabric.Point}
         */
        getCenterPoint: function() {
          var leftTop = new fabric.Point(this.left, this.top);
          return this.translateToCenterPoint(leftTop, this.originX, this.originY);
        },

        /**
         * Returns the coordinates of the object based on center coordinates
         * @param {fabric.Point} point The point which corresponds to the originX and originY params
         * @return {fabric.Point}
         */
        // getOriginPoint: function(center) {
        //   return this.translateToOriginPoint(center, this.originX, this.originY);
        // },

        /**
         * Returns the coordinates of the object as if it has a different origin
         * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
         * @return {fabric.Point}
         */
        getPointByOrigin: function(originX, originY) {
          var center = this.getCenterPoint();
          return this.translateToOriginPoint(center, originX, originY);
        },

        /**
         * Returns the point in local coordinates
         * @param {fabric.Point} point The point relative to the global coordinate system
         * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
         * @return {fabric.Point}
         */
        toLocalPoint: function(point, originX, originY) {
          var center = this.getCenterPoint(),
              p, p2;

          if (originX && originY) {
            p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);
          }
          else {
            p = new fabric.Point(this.left, this.top);
          }

          p2 = new fabric.Point(point.x, point.y);
          if (this.angle) {
            p2 = fabric.util.rotatePoint(p2, center, -degreesToRadians(this.angle));
          }
          return p2.subtractEquals(p);
        },

        /**
         * Returns the point in global coordinates
         * @param {fabric.Point} The point relative to the local coordinate system
         * @return {fabric.Point}
         */
        // toGlobalPoint: function(point) {
        //   return fabric.util.rotatePoint(point, this.getCenterPoint(), degreesToRadians(this.angle)).addEquals(new fabric.Point(this.left, this.top));
        // },

        /**
         * Sets the position of the object taking into consideration the object's origin
         * @param {fabric.Point} pos The new position of the object
         * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
         * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
         * @return {void}
         */
        setPositionByOrigin: function(pos, originX, originY) {
          var center = this.translateToCenterPoint(pos, originX, originY),
              position = this.translateToOriginPoint(center, this.originX, this.originY);

          this.set('left', position.x);
          this.set('top', position.y);
        },

        /**
         * @param {String} to One of 'left', 'center', 'right'
         */
        adjustPosition: function(to) {
          var angle = degreesToRadians(this.angle),
              hypotFull = this.getWidth(),
              xFull = Math.cos(angle) * hypotFull,
              yFull = Math.sin(angle) * hypotFull;

          //TODO: this function does not consider mixed situation like top, center.
          this.left += xFull * (originXOffset[to] - originXOffset[this.originX]);
          this.top += yFull * (originXOffset[to] - originXOffset[this.originX]);

          this.setCoords();
          this.originX = to;
        },

        /**
         * Sets the origin/position of the object to it's center point
         * @private
         * @return {void}
         */
        _setOriginToCenter: function() {
          this._originalOriginX = this.originX;
          this._originalOriginY = this.originY;

          var center = this.getCenterPoint();

          this.originX = 'center';
          this.originY = 'center';

          this.left = center.x;
          this.top = center.y;
        },

        /**
         * Resets the origin/position of the object to it's original origin
         * @private
         * @return {void}
         */
        _resetOrigin: function() {
          var originPoint = this.translateToOriginPoint(
            this.getCenterPoint(),
            this._originalOriginX,
            this._originalOriginY);

          this.originX = this._originalOriginX;
          this.originY = this._originalOriginY;

          this.left = originPoint.x;
          this.top = originPoint.y;

          this._originalOriginX = null;
          this._originalOriginY = null;
        },

        /**
         * @private
         */
        _getLeftTopCoords: function() {
          return this.translateToOriginPoint(this.getCenterPoint(), 'left', 'top');
        }
      });

    })();

    (function() {

      function getCoords(oCoords) {
        return [
          new fabric.Point(oCoords.tl.x, oCoords.tl.y),
          new fabric.Point(oCoords.tr.x, oCoords.tr.y),
          new fabric.Point(oCoords.br.x, oCoords.br.y),
          new fabric.Point(oCoords.bl.x, oCoords.bl.y)
        ];
      }

      var degreesToRadians = fabric.util.degreesToRadians,
          multiplyMatrices = fabric.util.multiplyTransformMatrices;

      fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {

        /**
         * Object containing coordinates of object's controls
         * @type Object
         * @default
         */
        oCoords: null,

        /**
         * Checks if object intersects with an area formed by 2 points
         * @param {Object} pointTL top-left point of area
         * @param {Object} pointBR bottom-right point of area
         * @return {Boolean} true if object intersects with an area formed by 2 points
         */
        intersectsWithRect: function(pointTL, pointBR) {
          var oCoords = getCoords(this.oCoords),
              intersection = fabric.Intersection.intersectPolygonRectangle(
                oCoords,
                pointTL,
                pointBR
              );
          return intersection.status === 'Intersection';
        },

        /**
         * Checks if object intersects with another object
         * @param {Object} other Object to test
         * @return {Boolean} true if object intersects with another object
         */
        intersectsWithObject: function(other) {
          var intersection = fabric.Intersection.intersectPolygonPolygon(
                getCoords(this.oCoords),
                getCoords(other.oCoords)
              );

          return intersection.status === 'Intersection';
        },

        /**
         * Checks if object is fully contained within area of another object
         * @param {Object} other Object to test
         * @return {Boolean} true if object is fully contained within area of another object
         */
        isContainedWithinObject: function(other) {
          var boundingRect = other.getBoundingRect(),
              point1 = new fabric.Point(boundingRect.left, boundingRect.top),
              point2 = new fabric.Point(boundingRect.left + boundingRect.width, boundingRect.top + boundingRect.height);

          return this.isContainedWithinRect(point1, point2);
        },

        /**
         * Checks if object is fully contained within area formed by 2 points
         * @param {Object} pointTL top-left point of area
         * @param {Object} pointBR bottom-right point of area
         * @return {Boolean} true if object is fully contained within area formed by 2 points
         */
        isContainedWithinRect: function(pointTL, pointBR) {
          var boundingRect = this.getBoundingRect();

          return (
            boundingRect.left >= pointTL.x &&
            boundingRect.left + boundingRect.width <= pointBR.x &&
            boundingRect.top >= pointTL.y &&
            boundingRect.top + boundingRect.height <= pointBR.y
          );
        },

        /**
         * Checks if point is inside the object
         * @param {fabric.Point} point Point to check against
         * @return {Boolean} true if point is inside the object
         */
        containsPoint: function(point) {
          var lines = this._getImageLines(this.oCoords),
              xPoints = this._findCrossPoints(point, lines);

          // if xPoints is odd then point is inside the object
          return (xPoints !== 0 && xPoints % 2 === 1);
        },

        /**
         * Method that returns an object with the object edges in it, given the coordinates of the corners
         * @private
         * @param {Object} oCoords Coordinates of the object corners
         */
        _getImageLines: function(oCoords) {
          return {
            topline: {
              o: oCoords.tl,
              d: oCoords.tr
            },
            rightline: {
              o: oCoords.tr,
              d: oCoords.br
            },
            bottomline: {
              o: oCoords.br,
              d: oCoords.bl
            },
            leftline: {
              o: oCoords.bl,
              d: oCoords.tl
            }
          };
        },

        /**
         * Helper method to determine how many cross points are between the 4 object edges
         * and the horizontal line determined by a point on canvas
         * @private
         * @param {fabric.Point} point Point to check
         * @param {Object} oCoords Coordinates of the object being evaluated
         */
        _findCrossPoints: function(point, oCoords) {
          var b1, b2, a1, a2, xi, yi,
              xcount = 0,
              iLine;

          for (var lineKey in oCoords) {
            iLine = oCoords[lineKey];
            // optimisation 1: line below point. no cross
            if ((iLine.o.y < point.y) && (iLine.d.y < point.y)) {
              continue;
            }
            // optimisation 2: line above point. no cross
            if ((iLine.o.y >= point.y) && (iLine.d.y >= point.y)) {
              continue;
            }
            // optimisation 3: vertical line case
            if ((iLine.o.x === iLine.d.x) && (iLine.o.x >= point.x)) {
              xi = iLine.o.x;
              yi = point.y;
            }
            // calculate the intersection point
            else {
              b1 = 0;
              b2 = (iLine.d.y - iLine.o.y) / (iLine.d.x - iLine.o.x);
              a1 = point.y - b1 * point.x;
              a2 = iLine.o.y - b2 * iLine.o.x;

              xi = - (a1 - a2) / (b1 - b2);
              yi = a1 + b1 * xi;
            }
            // dont count xi < point.x cases
            if (xi >= point.x) {
              xcount += 1;
            }
            // optimisation 4: specific for square images
            if (xcount === 2) {
              break;
            }
          }
          return xcount;
        },

        /**
         * Returns width of an object's bounding rectangle
         * @deprecated since 1.0.4
         * @return {Number} width value
         */
        getBoundingRectWidth: function() {
          return this.getBoundingRect().width;
        },

        /**
         * Returns height of an object's bounding rectangle
         * @deprecated since 1.0.4
         * @return {Number} height value
         */
        getBoundingRectHeight: function() {
          return this.getBoundingRect().height;
        },

        /**
         * Returns coordinates of object's bounding rectangle (left, top, width, height)
         * @return {Object} Object with left, top, width, height properties
         */
        getBoundingRect: function() {
          this.oCoords || this.setCoords();
          return fabric.util.makeBoundingBoxFromPoints([
            this.oCoords.tl,
            this.oCoords.tr,
            this.oCoords.br,
            this.oCoords.bl
          ]);
        },

        /**
         * Returns width of an object
         * @return {Number} width value
         */
        getWidth: function() {
          //needs to be changed
          return this._getTransformedDimensions().x;
        },

        /**
         * Returns height of an object
         * @return {Number} height value
         */
        getHeight: function() {
          //needs to be changed
          return this._getTransformedDimensions().y;
        },

        /**
         * Makes sure the scale is valid and modifies it if necessary
         * @private
         * @param {Number} value
         * @return {Number}
         */
        _constrainScale: function(value) {
          Iif (Math.abs(value) < this.minScaleLimit) {
            if (value < 0) {
              return -this.minScaleLimit;
            }
            else {
              return this.minScaleLimit;
            }
          }
          return value;
        },

        /**
         * Scales an object (equally by x and y)
         * @param {Number} value Scale factor
         * @return {fabric.Object} thisArg
         * @chainable
         */
        scale: function(value) {
          value = this._constrainScale(value);

          Iif (value < 0) {
            this.flipX = !this.flipX;
            this.flipY = !this.flipY;
            value *= -1;
          }

          this.scaleX = value;
          this.scaleY = value;
          this.setCoords();
          return this;
        },

        /**
         * Scales an object to a given width, with respect to bounding box (scaling by x/y equally)
         * @param {Number} value New width value
         * @return {fabric.Object} thisArg
         * @chainable
         */
        scaleToWidth: function(value) {
          // adjust to bounding rect factor so that rotated shapes would fit as well
          var boundingRectFactor = this.getBoundingRect().width / this.getWidth();
          return this.scale(value / this.width / boundingRectFactor);
        },

        /**
         * Scales an object to a given height, with respect to bounding box (scaling by x/y equally)
         * @param {Number} value New height value
         * @return {fabric.Object} thisArg
         * @chainable
         */
        scaleToHeight: function(value) {
          // adjust to bounding rect factor so that rotated shapes would fit as well
          var boundingRectFactor = this.getBoundingRect().height / this.getHeight();
          return this.scale(value / this.height / boundingRectFactor);
        },

        /**
         * Sets corner position coordinates based on current angle, width and height
         * See https://github.com/kangax/fabric.js/wiki/When-to-call-setCoords
         * @return {fabric.Object} thisArg
         * @chainable
         */
        setCoords: function() {
          var theta = degreesToRadians(this.angle),
              vpt = this.getViewportTransform(),
              dim = this._calculateCurrentDimensions(),
              currentWidth = dim.x, currentHeight = dim.y;

          // If width is negative, make postive. Fixes path selection issue
          Iif (currentWidth < 0) {
            currentWidth = Math.abs(currentWidth);
          }

          var sinTh = Math.sin(theta),
              cosTh = Math.cos(theta),
              _angle = currentWidth > 0 ? Math.atan(currentHeight / currentWidth) : 0,
              _hypotenuse = (currentWidth / Math.cos(_angle)) / 2,
              offsetX = Math.cos(_angle + theta) * _hypotenuse,
              offsetY = Math.sin(_angle + theta) * _hypotenuse,

              // offset added for rotate and scale actions
              coords = fabric.util.transformPoint(this.getCenterPoint(), vpt),
              tl  = new fabric.Point(coords.x - offsetX, coords.y - offsetY),
              tr  = new fabric.Point(tl.x + (currentWidth * cosTh), tl.y + (currentWidth * sinTh)),
              bl  = new fabric.Point(tl.x - (currentHeight * sinTh), tl.y + (currentHeight * cosTh)),
              br  = new fabric.Point(coords.x + offsetX, coords.y + offsetY),
              ml  = new fabric.Point((tl.x + bl.x)/2, (tl.y + bl.y)/2),
              mt  = new fabric.Point((tr.x + tl.x)/2, (tr.y + tl.y)/2),
              mr  = new fabric.Point((br.x + tr.x)/2, (br.y + tr.y)/2),
              mb  = new fabric.Point((br.x + bl.x)/2, (br.y + bl.y)/2),
              mtr = new fabric.Point(mt.x + sinTh * this.rotatingPointOffset, mt.y - cosTh * this.rotatingPointOffset);
          // debugging

          /* setTimeout(function() {
             canvas.contextTop.fillStyle = 'green';
             canvas.contextTop.fillRect(mb.x, mb.y, 3, 3);
             canvas.contextTop.fillRect(bl.x, bl.y, 3, 3);
             canvas.contextTop.fillRect(br.x, br.y, 3, 3);
             canvas.contextTop.fillRect(tl.x, tl.y, 3, 3);
             canvas.contextTop.fillRect(tr.x, tr.y, 3, 3);
             canvas.contextTop.fillRect(ml.x, ml.y, 3, 3);
             canvas.contextTop.fillRect(mr.x, mr.y, 3, 3);
             canvas.contextTop.fillRect(mt.x, mt.y, 3, 3);
             canvas.contextTop.fillRect(mtr.x, mtr.y, 3, 3);
           }, 50); */

          this.oCoords = {
            // corners
            tl: tl, tr: tr, br: br, bl: bl,
            // middle
            ml: ml, mt: mt, mr: mr, mb: mb,
            // rotating point
            mtr: mtr
          };

          // set coordinates of the draggable boxes in the corners used to scale/rotate the image
          this._setCornerCoords && this._setCornerCoords();

          return this;
        },

        _calcRotateMatrix: function() {
          Iif (this.angle) {
            var theta = degreesToRadians(this.angle), cos = Math.cos(theta), sin = Math.sin(theta);
            return [cos, sin, -sin, cos, 0, 0];
          }
          return [1, 0, 0, 1, 0, 0];
        },

        calcTransformMatrix: function() {
          var center = this.getCenterPoint(),
              translateMatrix = [1, 0, 0, 1, center.x, center.y],
              rotateMatrix = this._calcRotateMatrix(),
              dimensionMatrix = this._calcDimensionsTransformMatrix(this.skewX, this.skewY, true),
              matrix = this.group ? this.group.calcTransformMatrix() : [1, 0, 0, 1, 0, 0];
          matrix = multiplyMatrices(matrix, translateMatrix);
          matrix = multiplyMatrices(matrix, rotateMatrix);
          matrix = multiplyMatrices(matrix, dimensionMatrix);
          return matrix;
        },

        _calcDimensionsTransformMatrix: function(skewX, skewY, flipping) {
          var skewMatrixX = [1, 0, Math.tan(degreesToRadians(skewX)), 1],
              skewMatrixY = [1, Math.tan(degreesToRadians(skewY)), 0, 1],
              scaleX = this.scaleX * (flipping && this.flipX ? -1 : 1),
              scaleY = this.scaleY * (flipping && this.flipY ? -1 : 1),
              scaleMatrix = [scaleX, 0, 0, scaleY],
              m = multiplyMatrices(scaleMatrix, skewMatrixX, true);
          return multiplyMatrices(m, skewMatrixY, true);
        }
      });
    })();

    fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {

      /**
       * Moves an object to the bottom of the stack of drawn objects
       * @return {fabric.Object} thisArg
       * @chainable
       */
      sendToBack: function() {
        if (this.group) {
          fabric.StaticCanvas.prototype.sendToBack.call(this.group, this);
        }
        else {
          this.canvas.sendToBack(this);
        }
        return this;
      },

      /**
       * Moves an object to the top of the stack of drawn objects
       * @return {fabric.Object} thisArg
       * @chainable
       */
      bringToFront: function() {
        if (this.group) {
          fabric.StaticCanvas.prototype.bringToFront.call(this.group, this);
        }
        else {
          this.canvas.bringToFront(this);
        }
        return this;
      },

      /**
       * Moves an object down in stack of drawn objects
       * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object
       * @return {fabric.Object} thisArg
       * @chainable
       */
      sendBackwards: function(intersecting) {
        Iif (this.group) {
          fabric.StaticCanvas.prototype.sendBackwards.call(this.group, this, intersecting);
        }
        else {
          this.canvas.sendBackwards(this, intersecting);
        }
        return this;
      },

      /**
       * Moves an object up in stack of drawn objects
       * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object
       * @return {fabric.Object} thisArg
       * @chainable
       */
      bringForward: function(intersecting) {
        Iif (this.group) {
          fabric.StaticCanvas.prototype.bringForward.call(this.group, this, intersecting);
        }
        else {
          this.canvas.bringForward(this, intersecting);
        }
        return this;
      },

      /**
       * Moves an object to specified level in stack of drawn objects
       * @param {Number} index New position of object
       * @return {fabric.Object} thisArg
       * @chainable
       */
      moveTo: function(index) {
        if (this.group) {
          fabric.StaticCanvas.prototype.moveTo.call(this.group, this, index);
        }
        else {
          this.canvas.moveTo(this, index);
        }
        return this;
      }
    });

    /* _TO_SVG_START_ */
    (function() {

      function getSvgColorString(prop, value) {
        if (!value) {
          return prop + ': none; ';
        }
        else Iif (value.toLive) {
          return prop + ': url(#SVGID_' + value.id + '); ';
        }
        else {
          var color = new fabric.Color(value),
              str = prop + ': ' + value + '; ',
              opacity = color.getAlpha();
          if (opacity !== 1) {
            //change the color in rgb + opacity
            str = prop + ': ' + color.toRgb() + '; ';
            str += prop + '-opacity: ' + opacity.toString() + '; ';
          }
          return str;
        }
      }

      fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {
        /**
         * Returns styles-string for svg-export
         * @param {Boolean} skipShadow a boolean to skip shadow filter output
         * @return {String}
         */
        getSvgStyles: function(skipShadow) {

          var fillRule = this.fillRule,
              strokeWidth = this.strokeWidth ? this.strokeWidth : '0',
              strokeDashArray = this.strokeDashArray ? this.strokeDashArray.join(' ') : 'none',
              strokeLineCap = this.strokeLineCap ? this.strokeLineCap : 'butt',
              strokeLineJoin = this.strokeLineJoin ? this.strokeLineJoin : 'miter',
              strokeMiterLimit = this.strokeMiterLimit ? this.strokeMiterLimit : '4',
              opacity = typeof this.opacity !== 'undefined' ? this.opacity : '1',
              visibility = this.visible ? '' : ' visibility: hidden;',
              filter = skipShadow ? '' : this.getSvgFilter(),
              fill = getSvgColorString('fill', this.fill),
              stroke = getSvgColorString('stroke', this.stroke);

          return [
            stroke,
            'stroke-width: ', strokeWidth, '; ',
            'stroke-dasharray: ', strokeDashArray, '; ',
            'stroke-linecap: ', strokeLineCap, '; ',
            'stroke-linejoin: ', strokeLineJoin, '; ',
            'stroke-miterlimit: ', strokeMiterLimit, '; ',
            fill,
            'fill-rule: ', fillRule, '; ',
            'opacity: ', opacity, ';',
            filter,
            visibility
          ].join('');
        },

        /**
         * Returns filter for svg shadow
         * @return {String}
         */
        getSvgFilter: function() {
          return this.shadow ? 'filter: url(#SVGID_' + this.shadow.id + ');' : '';
        },

        /**
         * Returns transform-string for svg-export
         * @return {String}
         */
        getSvgTransform: function() {
          if (this.group && this.group.type === 'path-group') {
            return '';
          }
          var toFixed = fabric.util.toFixed,
              angle = this.getAngle(),
              skewX = (this.getSkewX() % 360),
              skewY = (this.getSkewY() % 360),
              center = this.getCenterPoint(),

              NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,

              translatePart = this.type === 'path-group' ? '' : 'translate(' +
                                toFixed(center.x, NUM_FRACTION_DIGITS) +
                                ' ' +
                                toFixed(center.y, NUM_FRACTION_DIGITS) +
                              ')',

              anglePart = angle !== 0
                ? (' rotate(' + toFixed(angle, NUM_FRACTION_DIGITS) + ')')
                : '',

              scalePart = (this.scaleX === 1 && this.scaleY === 1)
                ? '' :
                (' scale(' +
                  toFixed(this.scaleX, NUM_FRACTION_DIGITS) +
                  ' ' +
                  toFixed(this.scaleY, NUM_FRACTION_DIGITS) +
                ')'),

              skewXPart = skewX !== 0 ? ' skewX(' + toFixed(skewX, NUM_FRACTION_DIGITS) + ')' : '',

              skewYPart = skewY !== 0 ? ' skewY(' + toFixed(skewY, NUM_FRACTION_DIGITS) + ')' : '',

              addTranslateX = this.type === 'path-group' ? this.width : 0,

              flipXPart = this.flipX ? ' matrix(-1 0 0 1 ' + addTranslateX + ' 0) ' : '',

              addTranslateY = this.type === 'path-group' ? this.height : 0,

              flipYPart = this.flipY ? ' matrix(1 0 0 -1 0 ' + addTranslateY + ')' : '';

          return [
            translatePart, anglePart, scalePart, flipXPart, flipYPart, skewXPart, skewYPart
          ].join('');
        },

        /**
         * Returns transform-string for svg-export from the transform matrix of single elements
         * @return {String}
         */
        getSvgTransformMatrix: function() {
          return this.transformMatrix ? ' matrix(' + this.transformMatrix.join(' ') + ') ' : '';
        },

        /**
         * @private
         */
        _createBaseSVGMarkup: function() {
          var markup = [ ];

          Iif (this.fill && this.fill.toLive) {
            markup.push(this.fill.toSVG(this, false));
          }
          Iif (this.stroke && this.stroke.toLive) {
            markup.push(this.stroke.toSVG(this, false));
          }
          Iif (this.shadow) {
            markup.push(this.shadow.toSVG(this));
          }
          return markup;
        }
      });
    })();
    /* _TO_SVG_END_ */

    /*
      Depends on `stateProperties`
    */
    fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {

      /**
       * Returns true if object state (one of its state properties) was changed
       * @return {Boolean} true if instance' state has changed since `{@link fabric.Object#saveState}` was called
       */
      hasStateChanged: function() {
        return this.stateProperties.some(function(prop) {
          return this.get(prop) !== this.originalState[prop];
        }, this);
      },

      /**
       * Saves state of an object
       * @param {Object} [options] Object with additional `stateProperties` array to include when saving state
       * @return {fabric.Object} thisArg
       */
      saveState: function(options) {
        this.stateProperties.forEach(function(prop) {
          this.originalState[prop] = this.get(prop);
        }, this);

        Iif (options && options.stateProperties) {
          options.stateProperties.forEach(function(prop) {
            this.originalState[prop] = this.get(prop);
          }, this);
        }

        return this;
      },

      /**
       * Setups state of an object
       * @return {fabric.Object} thisArg
       */
      setupState: function() {
        this.originalState = { };
        this.saveState();

        return this;
      }
    });

    (function() {

      var degreesToRadians = fabric.util.degreesToRadians,
          //jscs:disable requireCamelCaseOrUpperCaseIdentifiers
          isVML = function() { return typeof G_vmlCanvasManager !== 'undefined'; };
      //jscs:enable requireCamelCaseOrUpperCaseIdentifiers

      fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {

        /**
         * The object interactivity controls.
         * @private
         */
        _controlsVisibility: null,

        /**
         * Determines which corner has been clicked
         * @private
         * @param {Object} pointer The pointer indicating the mouse position
         * @return {String|Boolean} corner code (tl, tr, bl, br, etc.), or false if nothing is found
         */
        _findTargetCorner: function(pointer) {
          Eif (!this.hasControls || !this.active) {
            return false;
          }

          var ex = pointer.x,
              ey = pointer.y,
              xPoints,
              lines;
          this.__corner = 0;
          for (var i in this.oCoords) {

            if (!this.isControlVisible(i)) {
              continue;
            }

            if (i === 'mtr' && !this.hasRotatingPoint) {
              continue;
            }

            if (this.get('lockUniScaling') &&
               (i === 'mt' || i === 'mr' || i === 'mb' || i === 'ml')) {
              continue;
            }

            lines = this._getImageLines(this.oCoords[i].corner);

            // debugging

            // canvas.contextTop.fillRect(lines.bottomline.d.x, lines.bottomline.d.y, 2, 2);
            // canvas.contextTop.fillRect(lines.bottomline.o.x, lines.bottomline.o.y, 2, 2);

            // canvas.contextTop.fillRect(lines.leftline.d.x, lines.leftline.d.y, 2, 2);
            // canvas.contextTop.fillRect(lines.leftline.o.x, lines.leftline.o.y, 2, 2);

            // canvas.contextTop.fillRect(lines.topline.d.x, lines.topline.d.y, 2, 2);
            // canvas.contextTop.fillRect(lines.topline.o.x, lines.topline.o.y, 2, 2);

            // canvas.contextTop.fillRect(lines.rightline.d.x, lines.rightline.d.y, 2, 2);
            // canvas.contextTop.fillRect(lines.rightline.o.x, lines.rightline.o.y, 2, 2);

            xPoints = this._findCrossPoints({ x: ex, y: ey }, lines);
            if (xPoints !== 0 && xPoints % 2 === 1) {
              this.__corner = i;
              return i;
            }
          }
          return false;
        },

        /**
         * Sets the coordinates of the draggable boxes in the corners of
         * the image used to scale/rotate it.
         * @private
         */
        _setCornerCoords: function() {
          var coords = this.oCoords,
              newTheta = degreesToRadians(45 - this.angle),
              /* Math.sqrt(2 * Math.pow(this.cornerSize, 2)) / 2, */
              /* 0.707106 stands for sqrt(2)/2 */
              cornerHypotenuse = this.cornerSize * 0.707106,
              cosHalfOffset = cornerHypotenuse * Math.cos(newTheta),
              sinHalfOffset = cornerHypotenuse * Math.sin(newTheta),
              x, y;

          for (var point in coords) {
            x = coords[point].x;
            y = coords[point].y;
            coords[point].corner = {
              tl: {
                x: x - sinHalfOffset,
                y: y - cosHalfOffset
              },
              tr: {
                x: x + cosHalfOffset,
                y: y - sinHalfOffset
              },
              bl: {
                x: x - cosHalfOffset,
                y: y + sinHalfOffset
              },
              br: {
                x: x + sinHalfOffset,
                y: y + cosHalfOffset
              }
            };
          }
        },

        /*
         * Calculate object dimensions from its properties
         * @private
         */
        _getNonTransformedDimensions: function() {
          var strokeWidth = this.strokeWidth,
              w = this.width,
              h = this.height,
              addStrokeToW = true,
              addStrokeToH = true;

          if (this.type === 'line' && this.strokeLineCap === 'butt') {
            addStrokeToH = w;
            addStrokeToW = h;
          }

          if (addStrokeToH) {
            h += h < 0 ? -strokeWidth : strokeWidth;
          }

          if (addStrokeToW) {
            w += w < 0 ? -strokeWidth : strokeWidth;
          }

          return { x: w, y: h };
        },

        /*
         * @private
         */
        _getTransformedDimensions: function(skewX, skewY) {
          Eif (typeof skewX === 'undefined') {
            skewX = this.skewX;
          }
          Eif (typeof skewY === 'undefined') {
            skewY = this.skewY;
          }
          var dimensions = this._getNonTransformedDimensions(),
              dimX = dimensions.x /2, dimY = dimensions.y / 2,
              points = [
              {
                x: -dimX,
                y: -dimY
              },
              {
                x: dimX,
                y: -dimY
              },
              {
                x: -dimX,
                y: dimY
              },
              {
                x: dimX,
                y: dimY
              }],
              i, transformMatrix = this._calcDimensionsTransformMatrix(skewX, skewY, false),
              bbox;
          for (i = 0; i < points.length; i++) {
            points[i] = fabric.util.transformPoint(points[i], transformMatrix);
          }
          bbox = fabric.util.makeBoundingBoxFromPoints(points);
          return { x: bbox.width, y: bbox.height };
        },

        /*
         * private
         */
        _calculateCurrentDimensions: function()  {
          var vpt = this.getViewportTransform(),
              dim = this._getTransformedDimensions(),
              w = dim.x, h = dim.y;

          w += 2 * this.padding;
          h += 2 * this.padding;

          return fabric.util.transformPoint(new fabric.Point(w, h), vpt, true);
        },

        /**
         * Draws a colored layer behind the object, inside its selection borders.
         * Requires public options: padding, selectionBackgroundColor
         * this function is called when the context is transformed
         * @param {CanvasRenderingContext2D} ctx Context to draw on
         * @return {fabric.Object} thisArg
         * @chainable
         */
        drawSelectionBackground: function(ctx) {
          Eif (!this.selectionBackgroundColor || !this.active || this.group) {
            return this;
          }
          ctx.save();
          var center = this.getCenterPoint(), wh = this._calculateCurrentDimensions();
          ctx.translate(center.x, center.y);
          ctx.rotate(degreesToRadians(this.angle));
          ctx.fillStyle = this.selectionBackgroundColor;
          ctx.fillRect(-wh.x/2, -wh.y/2, wh.x, wh.y);
          ctx.restore();
          return this;
        },

        /**
         * Draws borders of an object's bounding box.
         * Requires public properties: width, height
         * Requires public options: padding, borderColor
         * @param {CanvasRenderingContext2D} ctx Context to draw on
         * @return {fabric.Object} thisArg
         * @chainable
         */
        drawBorders: function(ctx) {
          Iif (!this.hasBorders) {
            return this;
          }

          var wh = this._calculateCurrentDimensions(),
              strokeWidth = 1 / this.borderScaleFactor,
              width = wh.x + strokeWidth,
              height = wh.y + strokeWidth;

          ctx.save();
          ctx.strokeStyle = this.borderColor;
          this._setLineDash(ctx, this.borderDashArray, null);

          ctx.strokeRect(
            -width / 2,
            -height / 2,
            width,
            height
          );

          Eif (this.hasRotatingPoint && this.isControlVisible('mtr') && !this.get('lockRotation') && this.hasControls) {

            var rotateHeight = -height / 2;

            ctx.beginPath();
            ctx.moveTo(0, rotateHeight);
            ctx.lineTo(0, rotateHeight - this.rotatingPointOffset);
            ctx.closePath();
            ctx.stroke();
          }

          ctx.restore();
          return this;
        },

        /**
         * Draws borders of an object's bounding box when it is inside a group.
         * Requires public properties: width, height
         * Requires public options: padding, borderColor
         * @param {CanvasRenderingContext2D} ctx Context to draw on
         * @param {object} options object representing current object parameters
         * @return {fabric.Object} thisArg
         * @chainable
         */
        drawBordersInGroup: function(ctx, options) {
          if (!this.hasBorders) {
            return this;
          }

          var p = this._getNonTransformedDimensions(),
              matrix = fabric.util.customTransformMatrix(options.scaleX, options.scaleY, options.skewX),
              wh = fabric.util.transformPoint(p, matrix),
              strokeWidth = 1 / this.borderScaleFactor,
              width = wh.x + strokeWidth + 2 * this.padding,
              height = wh.y + strokeWidth + 2 * this.padding;

          ctx.save();
          this._setLineDash(ctx, this.borderDashArray, null);
          ctx.strokeStyle = this.borderColor;

          ctx.strokeRect(
            -width / 2,
            -height / 2,
            width,
            height
          );

          ctx.restore();
          return this;
        },

        /**
         * Draws corners of an object's bounding box.
         * Requires public properties: width, height
         * Requires public options: cornerSize, padding
         * @param {CanvasRenderingContext2D} ctx Context to draw on
         * @return {fabric.Object} thisArg
         * @chainable
         */
        drawControls: function(ctx) {
          Iif (!this.hasControls) {
            return this;
          }

          var wh = this._calculateCurrentDimensions(),
              width = wh.x,
              height = wh.y,
              scaleOffset = this.cornerSize,
              left = -(width + scaleOffset) / 2,
              top = -(height + scaleOffset) / 2,
              methodName = this.transparentCorners ? 'stroke' : 'fill';

          ctx.save();
          ctx.strokeStyle = ctx.fillStyle = this.cornerColor;
          Iif (!this.transparentCorners) {
            ctx.strokeStyle = this.cornerStrokeColor;
          }
          this._setLineDash(ctx, this.cornerDashArray, null);

          // top-left
          this._drawControl('tl', ctx, methodName,
            left,
            top);

          // top-right
          this._drawControl('tr', ctx, methodName,
            left + width,
            top);

          // bottom-left
          this._drawControl('bl', ctx, methodName,
            left,
            top + height);

          // bottom-right
          this._drawControl('br', ctx, methodName,
            left + width,
            top + height);

          Eif (!this.get('lockUniScaling')) {

            // middle-top
            this._drawControl('mt', ctx, methodName,
              left + width/2,
              top);

            // middle-bottom
            this._drawControl('mb', ctx, methodName,
              left + width/2,
              top + height);

            // middle-right
            this._drawControl('mr', ctx, methodName,
              left + width,
              top + height/2);

            // middle-left
            this._drawControl('ml', ctx, methodName,
              left,
              top + height/2);
          }

          // middle-top-rotate
          Eif (this.hasRotatingPoint) {
            this._drawControl('mtr', ctx, methodName,
              left + width / 2,
              top - this.rotatingPointOffset);
          }

          ctx.restore();

          return this;
        },

        /**
         * @private
         */
        _drawControl: function(control, ctx, methodName, left, top) {
          Iif (!this.isControlVisible(control)) {
            return;
          }
          var size = this.cornerSize, stroke = !this.transparentCorners && this.cornerStrokeColor;
          switch (this.cornerStyle) {
            case 'circle':
              ctx.beginPath();
              ctx.arc(left + size/2, top + size/2, size/2, 0, 2 * Math.PI, false);
              ctx[methodName]();
              if (stroke) {
                ctx.stroke();
              }
              break;
            default:
              isVML() || this.transparentCorners || ctx.clearRect(left, top, size, size);
              ctx[methodName + 'Rect'](left, top, size, size);
              Iif (stroke) {
                ctx.strokeRect(left, top, size, size);
              }
          }
        },

        /**
         * Returns true if the specified control is visible, false otherwise.
         * @param {String} controlName The name of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.
         * @returns {Boolean} true if the specified control is visible, false otherwise
         */
        isControlVisible: function(controlName) {
          return this._getControlsVisibility()[controlName];
        },

        /**
         * Sets the visibility of the specified control.
         * @param {String} controlName The name of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.
         * @param {Boolean} visible true to set the specified control visible, false otherwise
         * @return {fabric.Object} thisArg
         * @chainable
         */
        setControlVisible: function(controlName, visible) {
          this._getControlsVisibility()[controlName] = visible;
          return this;
        },

        /**
         * Sets the visibility state of object controls.
         * @param {Object} [options] Options object
         * @param {Boolean} [options.bl] true to enable the bottom-left control, false to disable it
         * @param {Boolean} [options.br] true to enable the bottom-right control, false to disable it
         * @param {Boolean} [options.mb] true to enable the middle-bottom control, false to disable it
         * @param {Boolean} [options.ml] true to enable the middle-left control, false to disable it
         * @param {Boolean} [options.mr] true to enable the middle-right control, false to disable it
         * @param {Boolean} [options.mt] true to enable the middle-top control, false to disable it
         * @param {Boolean} [options.tl] true to enable the top-left control, false to disable it
         * @param {Boolean} [options.tr] true to enable the top-right control, false to disable it
         * @param {Boolean} [options.mtr] true to enable the middle-top-rotate control, false to disable it
         * @return {fabric.Object} thisArg
         * @chainable
         */
        setControlsVisibility: function(options) {
          options || (options = { });

          for (var p in options) {
            this.setControlVisible(p, options[p]);
          }
          return this;
        },

        /**
         * Returns the instance of the control visibility set for this object.
         * @private
         * @returns {Object}
         */
        _getControlsVisibility: function() {
          if (!this._controlsVisibility) {
            this._controlsVisibility = {
              tl: true,
              tr: true,
              br: true,
              bl: true,
              ml: true,
              mt: true,
              mr: true,
              mb: true,
              mtr: true
            };
          }
          return this._controlsVisibility;
        }
      });
    })();

    fabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {

      /**
       * Animation duration (in ms) for fx* methods
       * @type Number
       * @default
       */
      FX_DURATION: 500,

      /**
       * Centers object horizontally with animation.
       * @param {fabric.Object} object Object to center
       * @param {Object} [callbacks] Callbacks object with optional "onComplete" and/or "onChange" properties
       * @param {Function} [callbacks.onComplete] Invoked on completion
       * @param {Function} [callbacks.onChange] Invoked on every step of animation
       * @return {fabric.Canvas} thisArg
       * @chainable
       */
      fxCenterObjectH: function (object, callbacks) {
        callbacks = callbacks || { };

        var empty = function() { },
            onComplete = callbacks.onComplete || empty,
            onChange = callbacks.onChange || empty,
            _this = this;

        fabric.util.animate({
          startValue: object.get('left'),
          endValue: this.getCenter().left,
          duration: this.FX_DURATION,
          onChange: function(value) {
            object.set('left', value);
            _this.renderAll();
            onChange();
          },
          onComplete: function() {
            object.setCoords();
            onComplete();
          }
        });

        return this;
      },

      /**
       * Centers object vertically with animation.
       * @param {fabric.Object} object Object to center
       * @param {Object} [callbacks] Callbacks object with optional "onComplete" and/or "onChange" properties
       * @param {Function} [callbacks.onComplete] Invoked on completion
       * @param {Function} [callbacks.onChange] Invoked on every step of animation
       * @return {fabric.Canvas} thisArg
       * @chainable
       */
      fxCenterObjectV: function (object, callbacks) {
        callbacks = callbacks || { };

        var empty = function() { },
            onComplete = callbacks.onComplete || empty,
            onChange = callbacks.onChange || empty,
            _this = this;

        fabric.util.animate({
          startValue: object.get('top'),
          endValue: this.getCenter().top,
          duration: this.FX_DURATION,
          onChange: function(value) {
            object.set('top', value);
            _this.renderAll();
            onChange();
          },
          onComplete: function() {
            object.setCoords();
            onComplete();
          }
        });

        return this;
      },

      /**
       * Same as `fabric.Canvas#remove` but animated
       * @param {fabric.Object} object Object to remove
       * @param {Object} [callbacks] Callbacks object with optional "onComplete" and/or "onChange" properties
       * @param {Function} [callbacks.onComplete] Invoked on completion
       * @param {Function} [callbacks.onChange] Invoked on every step of animation
       * @return {fabric.Canvas} thisArg
       * @chainable
       */
      fxRemove: function (object, callbacks) {
        callbacks = callbacks || { };

        var empty = function() { },
            onComplete = callbacks.onComplete || empty,
            onChange = callbacks.onChange || empty,
            _this = this;

        fabric.util.animate({
          startValue: object.get('opacity'),
          endValue: 0,
          duration: this.FX_DURATION,
          onStart: function() {
            object.set('active', false);
          },
          onChange: function(value) {
            object.set('opacity', value);
            _this.renderAll();
            onChange();
          },
          onComplete: function () {
            _this.remove(object);
            onComplete();
          }
        });

        return this;
      }
    });

    fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {
      /**
       * Animates object's properties
       * @param {String|Object} property Property to animate (if string) or properties to animate (if object)
       * @param {Number|Object} value Value to animate property to (if string was given first) or options object
       * @return {fabric.Object} thisArg
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#animation}
       * @chainable
       *
       * As object — multiple properties
       *
       * object.animate({ left: ..., top: ... });
       * object.animate({ left: ..., top: ... }, { duration: ... });
       *
       * As string — one property
       *
       * object.animate('left', ...);
       * object.animate('left', { duration: ... });
       *
       */
      animate: function() {
        if (arguments[0] && typeof arguments[0] === 'object') {
          var propsToAnimate = [ ], prop, skipCallbacks;
          for (prop in arguments[0]) {
            propsToAnimate.push(prop);
          }
          for (var i = 0, len = propsToAnimate.length; i < len; i++) {
            prop = propsToAnimate[i];
            skipCallbacks = i !== len - 1;
            this._animate(prop, arguments[0][prop], arguments[1], skipCallbacks);
          }
        }
        else {
          this._animate.apply(this, arguments);
        }
        return this;
      },

      /**
       * @private
       * @param {String} property Property to animate
       * @param {String} to Value to animate to
       * @param {Object} [options] Options object
       * @param {Boolean} [skipCallbacks] When true, callbacks like onchange and oncomplete are not invoked
       */
      _animate: function(property, to, options, skipCallbacks) {
        var _this = this, propPair;

        to = to.toString();

        if (!options) {
          options = { };
        }
        else {
          options = fabric.util.object.clone(options);
        }

        Iif (~property.indexOf('.')) {
          propPair = property.split('.');
        }

        var currentValue = propPair
          ? this.get(propPair[0])[propPair[1]]
          : this.get(property);

        Eif (!('from' in options)) {
          options.from = currentValue;
        }

        Iif (~to.indexOf('=')) {
          to = currentValue + parseFloat(to.replace('=', ''));
        }
        else {
          to = parseFloat(to);
        }

        fabric.util.animate({
          startValue: options.from,
          endValue: to,
          byValue: options.by,
          easing: options.easing,
          duration: options.duration,
          abort: options.abort && function() {
            return options.abort.call(_this);
          },
          onChange: function(value) {
            Iif (propPair) {
              _this[propPair[0]][propPair[1]] = value;
            }
            else {
              _this.set(property, value);
            }
            if (skipCallbacks) {
              return;
            }
            options.onChange && options.onChange();
          },
          onComplete: function() {
            if (skipCallbacks) {
              return;
            }

            _this.setCoords();
            options.onComplete && options.onComplete();
          }
        });
      }
    });

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          coordProps = { x1: 1, x2: 1, y1: 1, y2: 1 },
          supportsLineDash = fabric.StaticCanvas.supports('setLineDash');

      Iif (fabric.Line) {
        fabric.warn('fabric.Line is already defined');
        return;
      }

      /**
       * Line class
       * @class fabric.Line
       * @extends fabric.Object
       * @see {@link fabric.Line#initialize} for constructor definition
       */
      fabric.Line = fabric.util.createClass(fabric.Object, /** @lends fabric.Line.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'line',

        /**
         * x value or first line edge
         * @type Number
         * @default
         */
        x1: 0,

        /**
         * y value or first line edge
         * @type Number
         * @default
         */
        y1: 0,

        /**
         * x value or second line edge
         * @type Number
         * @default
         */
        x2: 0,

        /**
         * y value or second line edge
         * @type Number
         * @default
         */
        y2: 0,

        /**
         * Constructor
         * @param {Array} [points] Array of points
         * @param {Object} [options] Options object
         * @return {fabric.Line} thisArg
         */
        initialize: function(points, options) {
          options = options || { };

          if (!points) {
            points = [0, 0, 0, 0];
          }

          this.callSuper('initialize', options);

          this.set('x1', points[0]);
          this.set('y1', points[1]);
          this.set('x2', points[2]);
          this.set('y2', points[3]);

          this._setWidthHeight(options);
        },

        /**
         * @private
         * @param {Object} [options] Options
         */
        _setWidthHeight: function(options) {
          options || (options = { });

          this.width = Math.abs(this.x2 - this.x1);
          this.height = Math.abs(this.y2 - this.y1);

          this.left = 'left' in options
            ? options.left
            : this._getLeftToOriginX();

          this.top = 'top' in options
            ? options.top
            : this._getTopToOriginY();
        },

        /**
         * @private
         * @param {String} key
         * @param {Any} value
         */
        _set: function(key, value) {
          this.callSuper('_set', key, value);
          if (typeof coordProps[key] !== 'undefined') {
            this._setWidthHeight();
          }
          return this;
        },

        /**
         * @private
         * @return {Number} leftToOriginX Distance from left edge of canvas to originX of Line.
         */
        _getLeftToOriginX: makeEdgeToOriginGetter(
          { // property names
            origin: 'originX',
            axis1: 'x1',
            axis2: 'x2',
            dimension: 'width'
          },
          { // possible values of origin
            nearest: 'left',
            center: 'center',
            farthest: 'right'
          }
        ),

        /**
         * @private
         * @return {Number} topToOriginY Distance from top edge of canvas to originY of Line.
         */
        _getTopToOriginY: makeEdgeToOriginGetter(
          { // property names
            origin: 'originY',
            axis1: 'y1',
            axis2: 'y2',
            dimension: 'height'
          },
          { // possible values of origin
            nearest: 'top',
            center: 'center',
            farthest: 'bottom'
          }
        ),

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx, noTransform) {
          ctx.beginPath();

          if (noTransform) {
            //  Line coords are distances from left-top of canvas to origin of line.
            //  To render line in a path-group, we need to translate them to
            //  distances from center of path-group to center of line.
            var cp = this.getCenterPoint();
            ctx.translate(
              cp.x - this.strokeWidth / 2,
              cp.y - this.strokeWidth / 2
            );
          }

          if (!this.strokeDashArray || this.strokeDashArray && supportsLineDash) {
            // move from center (of virtual box) to its left/top corner
            // we can't assume x1, y1 is top left and x2, y2 is bottom right
            var p = this.calcLinePoints();
            ctx.moveTo(p.x1, p.y1);
            ctx.lineTo(p.x2, p.y2);
          }

          ctx.lineWidth = this.strokeWidth;

          // TODO: test this
          // make sure setting "fill" changes color of a line
          // (by copying fillStyle to strokeStyle, since line is stroked, not filled)
          var origStrokeStyle = ctx.strokeStyle;
          ctx.strokeStyle = this.stroke || ctx.fillStyle;
          this.stroke && this._renderStroke(ctx);
          ctx.strokeStyle = origStrokeStyle;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderDashedStroke: function(ctx) {
          var p = this.calcLinePoints();

          ctx.beginPath();
          fabric.util.drawDashedLine(ctx, p.x1, p.y1, p.x2, p.y2, this.strokeDashArray);
          ctx.closePath();
        },

        /**
         * Returns object representation of an instance
         * @methd toObject
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return extend(this.callSuper('toObject', propertiesToInclude), this.calcLinePoints());
        },

        /**
         * Recalculates line points given width and height
         * @private
         */
        calcLinePoints: function() {
          var xMult = this.x1 <= this.x2 ? -1 : 1,
              yMult = this.y1 <= this.y2 ? -1 : 1,
              x1 = (xMult * this.width * 0.5),
              y1 = (yMult * this.height * 0.5),
              x2 = (xMult * this.width * -0.5),
              y2 = (yMult * this.height * -0.5);

          return {
            x1: x1,
            x2: x2,
            y1: y1,
            y2: y2
          };
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(),
              p = { x1: this.x1, x2: this.x2, y1: this.y1, y2: this.y2 };

          Eif (!(this.group && this.group.type === 'path-group')) {
            p = this.calcLinePoints();
          }
          markup.push(
            '<line ',
              'x1="', p.x1,
              '" y1="', p.y1,
              '" x2="', p.x2,
              '" y2="', p.y2,
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(),
              this.getSvgTransformMatrix(),
            '"/>\n'
          );

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns complexity of an instance
         * @return {Number} complexity
         */
        complexity: function() {
          return 1;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by {@link fabric.Line.fromElement})
       * @static
       * @memberOf fabric.Line
       * @see http://www.w3.org/TR/SVG/shapes.html#LineElement
       */
      fabric.Line.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x1 y1 x2 y2'.split(' '));

      /**
       * Returns fabric.Line instance from an SVG element
       * @static
       * @memberOf fabric.Line
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @return {fabric.Line} instance of fabric.Line
       */
      fabric.Line.fromElement = function(element, options) {
        var parsedAttributes = fabric.parseAttributes(element, fabric.Line.ATTRIBUTE_NAMES),
            points = [
              parsedAttributes.x1 || 0,
              parsedAttributes.y1 || 0,
              parsedAttributes.x2 || 0,
              parsedAttributes.y2 || 0
            ];
        return new fabric.Line(points, extend(parsedAttributes, options));
      };
      /* _FROM_SVG_END_ */

      /**
       * Returns fabric.Line instance from an object representation
       * @static
       * @memberOf fabric.Line
       * @param {Object} object Object to create an instance from
       * @return {fabric.Line} instance of fabric.Line
       */
      fabric.Line.fromObject = function(object) {
        var points = [object.x1, object.y1, object.x2, object.y2];
        return new fabric.Line(points, object);
      };

      /**
       * Produces a function that calculates distance from canvas edge to Line origin.
       */
      function makeEdgeToOriginGetter(propertyNames, originValues) {
        var origin = propertyNames.origin,
            axis1 = propertyNames.axis1,
            axis2 = propertyNames.axis2,
            dimension = propertyNames.dimension,
            nearest = originValues.nearest,
            center = originValues.center,
            farthest = originValues.farthest;

        return function() {
          switch (this.get(origin)) {
          case nearest:
            return Math.min(this.get(axis1), this.get(axis2));
          case center:
            return Math.min(this.get(axis1), this.get(axis2)) + (0.5 * this.get(dimension));
          case farthest:
            return Math.max(this.get(axis1), this.get(axis2));
          }
        };

      }

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          pi = Math.PI,
          extend = fabric.util.object.extend;

      Iif (fabric.Circle) {
        fabric.warn('fabric.Circle is already defined.');
        return;
      }

      /**
       * Circle class
       * @class fabric.Circle
       * @extends fabric.Object
       * @see {@link fabric.Circle#initialize} for constructor definition
       */
      fabric.Circle = fabric.util.createClass(fabric.Object, /** @lends fabric.Circle.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'circle',

        /**
         * Radius of this circle
         * @type Number
         * @default
         */
        radius: 0,

        /**
         * Start angle of the circle, moving clockwise
         * @type Number
         * @default 0
         */
        startAngle: 0,

        /**
         * End angle of the circle
         * @type Number
         * @default 2Pi
         */
        endAngle: pi * 2,

        /**
         * Constructor
         * @param {Object} [options] Options object
         * @return {fabric.Circle} thisArg
         */
        initialize: function(options) {
          options = options || { };

          this.callSuper('initialize', options);
          this.set('radius', options.radius || 0);

          this.startAngle = options.startAngle || this.startAngle;
          this.endAngle = options.endAngle || this.endAngle;
        },

        /**
         * @private
         * @param {String} key
         * @param {Any} value
         * @return {fabric.Circle} thisArg
         */
        _set: function(key, value) {
          this.callSuper('_set', key, value);

          if (key === 'radius') {
            this.setRadius(value);
          }

          return this;
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return extend(this.callSuper('toObject', propertiesToInclude), {
            radius: this.get('radius'),
            startAngle: this.startAngle,
            endAngle: this.endAngle
          });
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(), x = 0, y = 0,
          angle = (this.endAngle - this.startAngle) % ( 2 * pi);

          Eif (angle === 0) {
            Iif (this.group && this.group.type === 'path-group') {
              x = this.left + this.radius;
              y = this.top + this.radius;
            }
            markup.push(
              '<circle ',
                'cx="' + x + '" cy="' + y + '" ',
                'r="', this.radius,
                '" style="', this.getSvgStyles(),
                '" transform="', this.getSvgTransform(),
                ' ', this.getSvgTransformMatrix(),
              '"/>\n'
            );
          }
          else {
            var startX = Math.cos(this.startAngle) * this.radius,
                startY = Math.sin(this.startAngle) * this.radius,
                endX = Math.cos(this.endAngle) * this.radius,
                endY = Math.sin(this.endAngle) * this.radius,
                largeFlag = angle > pi ? '1' : '0';

            markup.push(
              '<path d="M ' + startX + ' ' + startY,
              ' A ' + this.radius + ' ' + this.radius,
              ' 0 ', + largeFlag + ' 1', ' ' + endX + ' ' + endY,
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(),
              ' ', this.getSvgTransformMatrix(),
              '"/>\n'
            );
          }

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx context to render on
         * @param {Boolean} [noTransform] When true, context is not transformed
         */
        _render: function(ctx, noTransform) {
          ctx.beginPath();
          ctx.arc(noTransform ? this.left + this.radius : 0,
                  noTransform ? this.top + this.radius : 0,
                  this.radius,
                  this.startAngle,
                  this.endAngle, false);
          this._renderFill(ctx);
          this._renderStroke(ctx);
        },

        /**
         * Returns horizontal radius of an object (according to how an object is scaled)
         * @return {Number}
         */
        getRadiusX: function() {
          return this.get('radius') * this.get('scaleX');
        },

        /**
         * Returns vertical radius of an object (according to how an object is scaled)
         * @return {Number}
         */
        getRadiusY: function() {
          return this.get('radius') * this.get('scaleY');
        },

        /**
         * Sets radius of an object (and updates width accordingly)
         * @return {fabric.Circle} thisArg
         */
        setRadius: function(value) {
          this.radius = value;
          return this.set('width', value * 2).set('height', value * 2);
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return 1;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by {@link fabric.Circle.fromElement})
       * @static
       * @memberOf fabric.Circle
       * @see: http://www.w3.org/TR/SVG/shapes.html#CircleElement
       */
      fabric.Circle.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy r'.split(' '));

      /**
       * Returns {@link fabric.Circle} instance from an SVG element
       * @static
       * @memberOf fabric.Circle
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @throws {Error} If value of `r` attribute is missing or invalid
       * @return {fabric.Circle} Instance of fabric.Circle
       */
      fabric.Circle.fromElement = function(element, options) {
        options || (options = { });

        var parsedAttributes = fabric.parseAttributes(element, fabric.Circle.ATTRIBUTE_NAMES);

        if (!isValidRadius(parsedAttributes)) {
          throw new Error('value of `r` attribute is required and can not be negative');
        }

        parsedAttributes.left = parsedAttributes.left || 0;
        parsedAttributes.top = parsedAttributes.top || 0;

        var obj = new fabric.Circle(extend(parsedAttributes, options));

        obj.left -= obj.radius;
        obj.top -= obj.radius;
        return obj;
      };

      /**
       * @private
       */
      function isValidRadius(attributes) {
        return (('radius' in attributes) && (attributes.radius >= 0));
      }
      /* _FROM_SVG_END_ */

      /**
       * Returns {@link fabric.Circle} instance from an object representation
       * @static
       * @memberOf fabric.Circle
       * @param {Object} object Object to create an instance from
       * @return {Object} Instance of fabric.Circle
       */
      fabric.Circle.fromObject = function(object) {
        return new fabric.Circle(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { });

      Iif (fabric.Triangle) {
        fabric.warn('fabric.Triangle is already defined');
        return;
      }

      /**
       * Triangle class
       * @class fabric.Triangle
       * @extends fabric.Object
       * @return {fabric.Triangle} thisArg
       * @see {@link fabric.Triangle#initialize} for constructor definition
       */
      fabric.Triangle = fabric.util.createClass(fabric.Object, /** @lends fabric.Triangle.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'triangle',

        /**
         * Constructor
         * @param {Object} [options] Options object
         * @return {Object} thisArg
         */
        initialize: function(options) {
          options = options || { };

          this.callSuper('initialize', options);

          this.set('width', options.width || 100)
              .set('height', options.height || 100);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx) {
          var widthBy2 = this.width / 2,
              heightBy2 = this.height / 2;

          ctx.beginPath();
          ctx.moveTo(-widthBy2, heightBy2);
          ctx.lineTo(0, -heightBy2);
          ctx.lineTo(widthBy2, heightBy2);
          ctx.closePath();

          this._renderFill(ctx);
          this._renderStroke(ctx);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderDashedStroke: function(ctx) {
          var widthBy2 = this.width / 2,
              heightBy2 = this.height / 2;

          ctx.beginPath();
          fabric.util.drawDashedLine(ctx, -widthBy2, heightBy2, 0, -heightBy2, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, 0, -heightBy2, widthBy2, heightBy2, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, widthBy2, heightBy2, -widthBy2, heightBy2, this.strokeDashArray);
          ctx.closePath();
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(),
              widthBy2 = this.width / 2,
              heightBy2 = this.height / 2,
              points = [
                -widthBy2 + ' ' + heightBy2,
                '0 ' + -heightBy2,
                widthBy2 + ' ' + heightBy2
              ]
              .join(',');

          markup.push(
            '<polygon ',
              'points="', points,
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(),
            '"/>'
          );

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns complexity of an instance
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return 1;
        }
      });

      /**
       * Returns fabric.Triangle instance from an object representation
       * @static
       * @memberOf fabric.Triangle
       * @param {Object} object Object to create an instance from
       * @return {Object} instance of Canvas.Triangle
       */
      fabric.Triangle.fromObject = function(object) {
        return new fabric.Triangle(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          piBy2   = Math.PI * 2,
          extend = fabric.util.object.extend;

      Iif (fabric.Ellipse) {
        fabric.warn('fabric.Ellipse is already defined.');
        return;
      }

      /**
       * Ellipse class
       * @class fabric.Ellipse
       * @extends fabric.Object
       * @return {fabric.Ellipse} thisArg
       * @see {@link fabric.Ellipse#initialize} for constructor definition
       */
      fabric.Ellipse = fabric.util.createClass(fabric.Object, /** @lends fabric.Ellipse.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'ellipse',

        /**
         * Horizontal radius
         * @type Number
         * @default
         */
        rx:   0,

        /**
         * Vertical radius
         * @type Number
         * @default
         */
        ry:   0,

        /**
         * Constructor
         * @param {Object} [options] Options object
         * @return {fabric.Ellipse} thisArg
         */
        initialize: function(options) {
          options = options || { };

          this.callSuper('initialize', options);

          this.set('rx', options.rx || 0);
          this.set('ry', options.ry || 0);
        },

        /**
         * @private
         * @param {String} key
         * @param {Any} value
         * @return {fabric.Ellipse} thisArg
         */
        _set: function(key, value) {
          this.callSuper('_set', key, value);
          switch (key) {

            case 'rx':
              this.rx = value;
              this.set('width', value * 2);
              break;

            case 'ry':
              this.ry = value;
              this.set('height', value * 2);
              break;

          }
          return this;
        },

        /**
         * Returns horizontal radius of an object (according to how an object is scaled)
         * @return {Number}
         */
        getRx: function() {
          return this.get('rx') * this.get('scaleX');
        },

        /**
         * Returns Vertical radius of an object (according to how an object is scaled)
         * @return {Number}
         */
        getRy: function() {
          return this.get('ry') * this.get('scaleY');
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return extend(this.callSuper('toObject', propertiesToInclude), {
            rx: this.get('rx'),
            ry: this.get('ry')
          });
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(), x = 0, y = 0;
          Iif (this.group && this.group.type === 'path-group') {
            x = this.left + this.rx;
            y = this.top + this.ry;
          }
          markup.push(
            '<ellipse ',
              'cx="', x, '" cy="', y, '" ',
              'rx="', this.rx,
              '" ry="', this.ry,
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(),
              this.getSvgTransformMatrix(),
            '"/>\n'
          );

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx context to render on
         * @param {Boolean} [noTransform] When true, context is not transformed
         */
        _render: function(ctx, noTransform) {
          ctx.beginPath();
          ctx.save();
          ctx.transform(1, 0, 0, this.ry/this.rx, 0, 0);
          ctx.arc(
            noTransform ? this.left + this.rx : 0,
            noTransform ? (this.top + this.ry) * this.rx/this.ry : 0,
            this.rx,
            0,
            piBy2,
            false);
          ctx.restore();
          this._renderFill(ctx);
          this._renderStroke(ctx);
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity
         */
        complexity: function() {
          return 1;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by {@link fabric.Ellipse.fromElement})
       * @static
       * @memberOf fabric.Ellipse
       * @see http://www.w3.org/TR/SVG/shapes.html#EllipseElement
       */
      fabric.Ellipse.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy rx ry'.split(' '));

      /**
       * Returns {@link fabric.Ellipse} instance from an SVG element
       * @static
       * @memberOf fabric.Ellipse
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @return {fabric.Ellipse}
       */
      fabric.Ellipse.fromElement = function(element, options) {
        options || (options = { });

        var parsedAttributes = fabric.parseAttributes(element, fabric.Ellipse.ATTRIBUTE_NAMES);

        parsedAttributes.left = parsedAttributes.left || 0;
        parsedAttributes.top = parsedAttributes.top || 0;

        var ellipse = new fabric.Ellipse(extend(parsedAttributes, options));

        ellipse.top -= ellipse.ry;
        ellipse.left -= ellipse.rx;
        return ellipse;
      };
      /* _FROM_SVG_END_ */

      /**
       * Returns {@link fabric.Ellipse} instance from an object representation
       * @static
       * @memberOf fabric.Ellipse
       * @param {Object} object Object to create an instance from
       * @return {fabric.Ellipse}
       */
      fabric.Ellipse.fromObject = function(object) {
        return new fabric.Ellipse(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      Iif (fabric.Rect) {
        fabric.warn('fabric.Rect is already defined');
        return;
      }

      var stateProperties = fabric.Object.prototype.stateProperties.concat();
      stateProperties.push('rx', 'ry', 'x', 'y');

      /**
       * Rectangle class
       * @class fabric.Rect
       * @extends fabric.Object
       * @return {fabric.Rect} thisArg
       * @see {@link fabric.Rect#initialize} for constructor definition
       */
      fabric.Rect = fabric.util.createClass(fabric.Object, /** @lends fabric.Rect.prototype */ {

        /**
         * List of properties to consider when checking if state of an object is changed ({@link fabric.Object#hasStateChanged})
         * as well as for history (undo/redo) purposes
         * @type Array
         */
        stateProperties: stateProperties,

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'rect',

        /**
         * Horizontal border radius
         * @type Number
         * @default
         */
        rx:   0,

        /**
         * Vertical border radius
         * @type Number
         * @default
         */
        ry:   0,

        /**
         * Used to specify dash pattern for stroke on this object
         * @type Array
         */
        strokeDashArray: null,

        /**
         * Constructor
         * @param {Object} [options] Options object
         * @return {Object} thisArg
         */
        initialize: function(options) {
          options = options || { };

          this.callSuper('initialize', options);
          this._initRxRy();

        },

        /**
         * Initializes rx/ry attributes
         * @private
         */
        _initRxRy: function() {
          Iif (this.rx && !this.ry) {
            this.ry = this.rx;
          }
          else Iif (this.ry && !this.rx) {
            this.rx = this.ry;
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx, noTransform) {

          // optimize 1x1 case (used in spray brush)
          Iif (this.width === 1 && this.height === 1) {
            ctx.fillRect(-0.5, -0.5, 1, 1);
            return;
          }

          var rx = this.rx ? Math.min(this.rx, this.width / 2) : 0,
              ry = this.ry ? Math.min(this.ry, this.height / 2) : 0,
              w = this.width,
              h = this.height,
              x = noTransform ? this.left : -this.width / 2,
              y = noTransform ? this.top : -this.height / 2,
              isRounded = rx !== 0 || ry !== 0,
              k = 1 - 0.5522847498 /* "magic number" for bezier approximations of arcs (http://itc.ktu.lt/itc354/Riskus354.pdf) */;

          ctx.beginPath();

          ctx.moveTo(x + rx, y);

          ctx.lineTo(x + w - rx, y);
          isRounded && ctx.bezierCurveTo(x + w - k * rx, y, x + w, y + k * ry, x + w, y + ry);

          ctx.lineTo(x + w, y + h - ry);
          isRounded && ctx.bezierCurveTo(x + w, y + h - k * ry, x + w - k * rx, y + h, x + w - rx, y + h);

          ctx.lineTo(x + rx, y + h);
          isRounded && ctx.bezierCurveTo(x + k * rx, y + h, x, y + h - k * ry, x, y + h - ry);

          ctx.lineTo(x, y + ry);
          isRounded && ctx.bezierCurveTo(x, y + k * ry, x + k * rx, y, x + rx, y);

          ctx.closePath();

          this._renderFill(ctx);
          this._renderStroke(ctx);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderDashedStroke: function(ctx) {
          var x = -this.width / 2,
              y = -this.height / 2,
              w = this.width,
              h = this.height;

          ctx.beginPath();
          fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);
          ctx.closePath();
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var object = extend(this.callSuper('toObject', propertiesToInclude), {
            rx: this.get('rx') || 0,
            ry: this.get('ry') || 0
          });
          if (!this.includeDefaultValues) {
            this._removeDefaultValues(object);
          }
          return object;
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(), x = this.left, y = this.top;
          Eif (!(this.group && this.group.type === 'path-group')) {
            x = -this.width / 2;
            y = -this.height / 2;
          }
          markup.push(
            '<rect ',
              'x="', x, '" y="', y,
              '" rx="', this.get('rx'), '" ry="', this.get('ry'),
              '" width="', this.width, '" height="', this.height,
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(),
              this.getSvgTransformMatrix(),
            '"/>\n');

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns complexity of an instance
         * @return {Number} complexity
         */
        complexity: function() {
          return 1;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by `fabric.Rect.fromElement`)
       * @static
       * @memberOf fabric.Rect
       * @see: http://www.w3.org/TR/SVG/shapes.html#RectElement
       */
      fabric.Rect.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x y rx ry width height'.split(' '));

      /**
       * Returns {@link fabric.Rect} instance from an SVG element
       * @static
       * @memberOf fabric.Rect
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @return {fabric.Rect} Instance of fabric.Rect
       */
      fabric.Rect.fromElement = function(element, options) {
        if (!element) {
          return null;
        }
        options = options || { };

        var parsedAttributes = fabric.parseAttributes(element, fabric.Rect.ATTRIBUTE_NAMES);

        parsedAttributes.left = parsedAttributes.left || 0;
        parsedAttributes.top  = parsedAttributes.top  || 0;
        var rect = new fabric.Rect(extend((options ? fabric.util.object.clone(options) : { }), parsedAttributes));
        rect.visible = rect.width > 0 && rect.height > 0;
        return rect;
      };
      /* _FROM_SVG_END_ */

      /**
       * Returns {@link fabric.Rect} instance from an object representation
       * @static
       * @memberOf fabric.Rect
       * @param {Object} object Object to create an instance from
       * @return {Object} instance of fabric.Rect
       */
      fabric.Rect.fromObject = function(object) {
        return new fabric.Rect(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { });

      Iif (fabric.Polyline) {
        fabric.warn('fabric.Polyline is already defined');
        return;
      }

      /**
       * Polyline class
       * @class fabric.Polyline
       * @extends fabric.Object
       * @see {@link fabric.Polyline#initialize} for constructor definition
       */
      fabric.Polyline = fabric.util.createClass(fabric.Object, /** @lends fabric.Polyline.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'polyline',

        /**
         * Points array
         * @type Array
         * @default
         */
        points: null,

        /**
         * Minimum X from points values, necessary to offset points
         * @type Number
         * @default
         */
        minX: 0,

        /**
         * Minimum Y from points values, necessary to offset points
         * @type Number
         * @default
         */
        minY: 0,

        /**
         * Constructor
         * @param {Array} points Array of points (where each point is an object with x and y)
         * @param {Object} [options] Options object
         * @param {Boolean} [skipOffset] Whether points offsetting should be skipped
         * @return {fabric.Polyline} thisArg
         * @example
         * var poly = new fabric.Polyline([
         *     { x: 10, y: 10 },
         *     { x: 50, y: 30 },
         *     { x: 40, y: 70 },
         *     { x: 60, y: 50 },
         *     { x: 100, y: 150 },
         *     { x: 40, y: 100 }
         *   ], {
         *   stroke: 'red',
         *   left: 100,
         *   top: 100
         * });
         */
        initialize: function(points, options) {
          return fabric.Polygon.prototype.initialize.call(this, points, options);
        },

        /**
         * @private
         */
        _calcDimensions: function() {
          return fabric.Polygon.prototype._calcDimensions.call(this);
        },

        /**
         * @private
         */
        _applyPointOffset: function() {
          return fabric.Polygon.prototype._applyPointOffset.call(this);
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} Object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return fabric.Polygon.prototype.toObject.call(this, propertiesToInclude);
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          return fabric.Polygon.prototype.toSVG.call(this, reviver);
        },
        /* _TO_SVG_END_ */

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx, noTransform) {
          if (!fabric.Polygon.prototype.commonRender.call(this, ctx, noTransform)) {
            return;
          }
          this._renderFill(ctx);
          this._renderStroke(ctx);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderDashedStroke: function(ctx) {
          var p1, p2;

          ctx.beginPath();
          for (var i = 0, len = this.points.length; i < len; i++) {
            p1 = this.points[i];
            p2 = this.points[i + 1] || p1;
            fabric.util.drawDashedLine(ctx, p1.x, p1.y, p2.x, p2.y, this.strokeDashArray);
          }
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return this.get('points').length;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by {@link fabric.Polyline.fromElement})
       * @static
       * @memberOf fabric.Polyline
       * @see: http://www.w3.org/TR/SVG/shapes.html#PolylineElement
       */
      fabric.Polyline.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();

      /**
       * Returns fabric.Polyline instance from an SVG element
       * @static
       * @memberOf fabric.Polyline
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @return {fabric.Polyline} Instance of fabric.Polyline
       */
      fabric.Polyline.fromElement = function(element, options) {
        if (!element) {
          return null;
        }
        options || (options = { });

        var points = fabric.parsePointsAttribute(element.getAttribute('points')),
            parsedAttributes = fabric.parseAttributes(element, fabric.Polyline.ATTRIBUTE_NAMES);

        return new fabric.Polyline(points, fabric.util.object.extend(parsedAttributes, options));
      };
      /* _FROM_SVG_END_ */

      /**
       * Returns fabric.Polyline instance from an object representation
       * @static
       * @memberOf fabric.Polyline
       * @param {Object} object Object to create an instance from
       * @return {fabric.Polyline} Instance of fabric.Polyline
       */
      fabric.Polyline.fromObject = function(object) {
        var points = object.points;
        return new fabric.Polyline(points, object, true);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          min = fabric.util.array.min,
          max = fabric.util.array.max,
          toFixed = fabric.util.toFixed;

      Iif (fabric.Polygon) {
        fabric.warn('fabric.Polygon is already defined');
        return;
      }

      /**
       * Polygon class
       * @class fabric.Polygon
       * @extends fabric.Object
       * @see {@link fabric.Polygon#initialize} for constructor definition
       */
      fabric.Polygon = fabric.util.createClass(fabric.Object, /** @lends fabric.Polygon.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'polygon',

        /**
         * Points array
         * @type Array
         * @default
         */
        points: null,

        /**
         * Minimum X from points values, necessary to offset points
         * @type Number
         * @default
         */
        minX: 0,

        /**
         * Minimum Y from points values, necessary to offset points
         * @type Number
         * @default
         */
        minY: 0,

        /**
         * Constructor
         * @param {Array} points Array of points
         * @param {Object} [options] Options object
         * @return {fabric.Polygon} thisArg
         */
        initialize: function(points, options) {
          options = options || { };
          this.points = points || [ ];
          this.callSuper('initialize', options);
          this._calcDimensions();
          if (!('top' in options)) {
            this.top = this.minY;
          }
          if (!('left' in options)) {
            this.left = this.minX;
          }
          this.pathOffset = {
            x: this.minX + this.width / 2,
            y: this.minY + this.height / 2
          };
        },

        /**
         * @private
         */
        _calcDimensions: function() {

          var points = this.points,
              minX = min(points, 'x'),
              minY = min(points, 'y'),
              maxX = max(points, 'x'),
              maxY = max(points, 'y');

          this.width = (maxX - minX) || 0;
          this.height = (maxY - minY) || 0;

          this.minX = minX || 0,
          this.minY = minY || 0;
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} Object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return extend(this.callSuper('toObject', propertiesToInclude), {
            points: this.points.concat()
          });
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var points = [], addTransform,
              markup = this._createBaseSVGMarkup();

          for (var i = 0, len = this.points.length; i < len; i++) {
            points.push(toFixed(this.points[i].x, 2), ',', toFixed(this.points[i].y, 2), ' ');
          }
          Eif (!(this.group && this.group.type === 'path-group')) {
            addTransform = ' translate(' + (-this.pathOffset.x) + ', ' + (-this.pathOffset.y) + ') ';
          }
          markup.push(
            '<', this.type, ' ',
              'points="', points.join(''),
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(), addTransform,
              ' ', this.getSvgTransformMatrix(),
            '"/>\n'
          );

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx, noTransform) {
          if (!this.commonRender(ctx, noTransform)) {
            return;
          }
          this._renderFill(ctx);
          if (this.stroke || this.strokeDashArray) {
            ctx.closePath();
            this._renderStroke(ctx);
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        commonRender: function(ctx, noTransform) {
          var point, len = this.points.length;

          if (!len || isNaN(this.points[len - 1].y)) {
            // do not draw if no points or odd points
            // NaN comes from parseFloat of a empty string in parser
            return false;
          }

          noTransform || ctx.translate(-this.pathOffset.x, -this.pathOffset.y);
          ctx.beginPath();
          ctx.moveTo(this.points[0].x, this.points[0].y);
          for (var i = 0; i < len; i++) {
            point = this.points[i];
            ctx.lineTo(point.x, point.y);
          }
          return true;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderDashedStroke: function(ctx) {
          fabric.Polyline.prototype._renderDashedStroke.call(this, ctx);
          ctx.closePath();
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return this.points.length;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by `fabric.Polygon.fromElement`)
       * @static
       * @memberOf fabric.Polygon
       * @see: http://www.w3.org/TR/SVG/shapes.html#PolygonElement
       */
      fabric.Polygon.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();

      /**
       * Returns {@link fabric.Polygon} instance from an SVG element
       * @static
       * @memberOf fabric.Polygon
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @return {fabric.Polygon} Instance of fabric.Polygon
       */
      fabric.Polygon.fromElement = function(element, options) {
        if (!element) {
          return null;
        }

        options || (options = { });

        var points = fabric.parsePointsAttribute(element.getAttribute('points')),
            parsedAttributes = fabric.parseAttributes(element, fabric.Polygon.ATTRIBUTE_NAMES);

        return new fabric.Polygon(points, extend(parsedAttributes, options));
      };
      /* _FROM_SVG_END_ */

      /**
       * Returns fabric.Polygon instance from an object representation
       * @static
       * @memberOf fabric.Polygon
       * @param {Object} object Object to create an instance from
       * @return {fabric.Polygon} Instance of fabric.Polygon
       */
      fabric.Polygon.fromObject = function(object) {
        return new fabric.Polygon(object.points, object, true);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          min = fabric.util.array.min,
          max = fabric.util.array.max,
          extend = fabric.util.object.extend,
          _toString = Object.prototype.toString,
          drawArc = fabric.util.drawArc,
          commandLengths = {
            m: 2,
            l: 2,
            h: 1,
            v: 1,
            c: 6,
            s: 4,
            q: 4,
            t: 2,
            a: 7
          },
          repeatedCommands = {
            m: 'l',
            M: 'L'
          };

      Iif (fabric.Path) {
        fabric.warn('fabric.Path is already defined');
        return;
      }

      /**
       * Path class
       * @class fabric.Path
       * @extends fabric.Object
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#path_and_pathgroup}
       * @see {@link fabric.Path#initialize} for constructor definition
       */
      fabric.Path = fabric.util.createClass(fabric.Object, /** @lends fabric.Path.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'path',

        /**
         * Array of path points
         * @type Array
         * @default
         */
        path: null,

        /**
         * Minimum X from points values, necessary to offset points
         * @type Number
         * @default
         */
        minX: 0,

        /**
         * Minimum Y from points values, necessary to offset points
         * @type Number
         * @default
         */
        minY: 0,

        /**
         * Constructor
         * @param {Array|String} path Path data (sequence of coordinates and corresponding "command" tokens)
         * @param {Object} [options] Options object
         * @return {fabric.Path} thisArg
         */
        initialize: function(path, options) {
          options = options || { };

          this.setOptions(options);

          if (!path) {
            path = [ ];
          }

          var fromArray = _toString.call(path) === '[object Array]';

          this.path = fromArray
            ? path
            // one of commands (m,M,l,L,q,Q,c,C,etc.) followed by non-command characters (i.e. command values)
            : path.match && path.match(/[mzlhvcsqta][^mzlhvcsqta]*/gi);

          Iif (!this.path) {
            return;
          }

          if (!fromArray) {
            this.path = this._parsePath();
          }

          this._setPositionDimensions(options);

          if (options.sourcePath) {
            this.setSourcePath(options.sourcePath);
          }
        },

        /**
         * @private
         * @param {Object} options Options object
         */
        _setPositionDimensions: function(options) {
          var calcDim = this._parseDimensions();

          this.minX = calcDim.left;
          this.minY = calcDim.top;
          this.width = calcDim.width;
          this.height = calcDim.height;

          if (typeof options.left === 'undefined') {
            this.left = calcDim.left + (this.originX === 'center'
              ? this.width / 2
              : this.originX === 'right'
                ? this.width
                : 0);
          }

          if (typeof options.top === 'undefined') {
            this.top = calcDim.top + (this.originY === 'center'
              ? this.height / 2
              : this.originY === 'bottom'
                ? this.height
                : 0);
          }

          this.pathOffset = this.pathOffset || {
            x: this.minX + this.width / 2,
            y: this.minY + this.height / 2
          };
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx context to render path on
         */
        _render: function(ctx) {
          var current, // current instruction
              previous = null,
              subpathStartX = 0,
              subpathStartY = 0,
              x = 0, // current x
              y = 0, // current y
              controlX = 0, // current control point x
              controlY = 0, // current control point y
              tempX,
              tempY,
              l = -this.pathOffset.x,
              t = -this.pathOffset.y;

          Iif (this.group && this.group.type === 'path-group') {
            l = 0;
            t = 0;
          }

          ctx.beginPath();

          for (var i = 0, len = this.path.length; i < len; ++i) {

            current = this.path[i];

            switch (current[0]) { // first letter

              case 'l': // lineto, relative
                x += current[1];
                y += current[2];
                ctx.lineTo(x + l, y + t);
                break;

              case 'L': // lineto, absolute
                x = current[1];
                y = current[2];
                ctx.lineTo(x + l, y + t);
                break;

              case 'h': // horizontal lineto, relative
                x += current[1];
                ctx.lineTo(x + l, y + t);
                break;

              case 'H': // horizontal lineto, absolute
                x = current[1];
                ctx.lineTo(x + l, y + t);
                break;

              case 'v': // vertical lineto, relative
                y += current[1];
                ctx.lineTo(x + l, y + t);
                break;

              case 'V': // verical lineto, absolute
                y = current[1];
                ctx.lineTo(x + l, y + t);
                break;

              case 'm': // moveTo, relative
                x += current[1];
                y += current[2];
                subpathStartX = x;
                subpathStartY = y;
                ctx.moveTo(x + l, y + t);
                break;

              case 'M': // moveTo, absolute
                x = current[1];
                y = current[2];
                subpathStartX = x;
                subpathStartY = y;
                ctx.moveTo(x + l, y + t);
                break;

              case 'c': // bezierCurveTo, relative
                tempX = x + current[5];
                tempY = y + current[6];
                controlX = x + current[3];
                controlY = y + current[4];
                ctx.bezierCurveTo(
                  x + current[1] + l, // x1
                  y + current[2] + t, // y1
                  controlX + l, // x2
                  controlY + t, // y2
                  tempX + l,
                  tempY + t
                );
                x = tempX;
                y = tempY;
                break;

              case 'C': // bezierCurveTo, absolute
                x = current[5];
                y = current[6];
                controlX = current[3];
                controlY = current[4];
                ctx.bezierCurveTo(
                  current[1] + l,
                  current[2] + t,
                  controlX + l,
                  controlY + t,
                  x + l,
                  y + t
                );
                break;

              case 's': // shorthand cubic bezierCurveTo, relative

                // transform to absolute x,y
                tempX = x + current[3];
                tempY = y + current[4];

                if (previous[0].match(/[CcSs]/) === null) {
                  // If there is no previous command or if the previous command was not a C, c, S, or s,
                  // the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control points
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }

                ctx.bezierCurveTo(
                  controlX + l,
                  controlY + t,
                  x + current[1] + l,
                  y + current[2] + t,
                  tempX + l,
                  tempY + t
                );
                // set control point to 2nd one of this command
                // "... the first control point is assumed to be
                // the reflection of the second control point on
                // the previous command relative to the current point."
                controlX = x + current[1];
                controlY = y + current[2];

                x = tempX;
                y = tempY;
                break;

              case 'S': // shorthand cubic bezierCurveTo, absolute
                tempX = current[3];
                tempY = current[4];
                if (previous[0].match(/[CcSs]/) === null) {
                  // If there is no previous command or if the previous command was not a C, c, S, or s,
                  // the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control points
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }
                ctx.bezierCurveTo(
                  controlX + l,
                  controlY + t,
                  current[1] + l,
                  current[2] + t,
                  tempX + l,
                  tempY + t
                );
                x = tempX;
                y = tempY;

                // set control point to 2nd one of this command
                // "... the first control point is assumed to be
                // the reflection of the second control point on
                // the previous command relative to the current point."
                controlX = current[1];
                controlY = current[2];

                break;

              case 'q': // quadraticCurveTo, relative
                // transform to absolute x,y
                tempX = x + current[3];
                tempY = y + current[4];

                controlX = x + current[1];
                controlY = y + current[2];

                ctx.quadraticCurveTo(
                  controlX + l,
                  controlY + t,
                  tempX + l,
                  tempY + t
                );
                x = tempX;
                y = tempY;
                break;

              case 'Q': // quadraticCurveTo, absolute
                tempX = current[3];
                tempY = current[4];

                ctx.quadraticCurveTo(
                  current[1] + l,
                  current[2] + t,
                  tempX + l,
                  tempY + t
                );
                x = tempX;
                y = tempY;
                controlX = current[1];
                controlY = current[2];
                break;

              case 't': // shorthand quadraticCurveTo, relative

                // transform to absolute x,y
                tempX = x + current[1];
                tempY = y + current[2];

                if (previous[0].match(/[QqTt]/) === null) {
                  // If there is no previous command or if the previous command was not a Q, q, T or t,
                  // assume the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control point
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }

                ctx.quadraticCurveTo(
                  controlX + l,
                  controlY + t,
                  tempX + l,
                  tempY + t
                );
                x = tempX;
                y = tempY;

                break;

              case 'T':
                tempX = current[1];
                tempY = current[2];

                if (previous[0].match(/[QqTt]/) === null) {
                  // If there is no previous command or if the previous command was not a Q, q, T or t,
                  // assume the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control point
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }
                ctx.quadraticCurveTo(
                  controlX + l,
                  controlY + t,
                  tempX + l,
                  tempY + t
                );
                x = tempX;
                y = tempY;
                break;

              case 'a':
                // TODO: optimize this
                drawArc(ctx, x + l, y + t, [
                  current[1],
                  current[2],
                  current[3],
                  current[4],
                  current[5],
                  current[6] + x + l,
                  current[7] + y + t
                ]);
                x += current[6];
                y += current[7];
                break;

              case 'A':
                // TODO: optimize this
                drawArc(ctx, x + l, y + t, [
                  current[1],
                  current[2],
                  current[3],
                  current[4],
                  current[5],
                  current[6] + l,
                  current[7] + t
                ]);
                x = current[6];
                y = current[7];
                break;

              case 'z':
              case 'Z':
                x = subpathStartX;
                y = subpathStartY;
                ctx.closePath();
                break;
            }
            previous = current;
          }
          this._renderFill(ctx);
          this._renderStroke(ctx);
        },

        /**
         * Returns string representation of an instance
         * @return {String} string representation of an instance
         */
        toString: function() {
          return '#<fabric.Path (' + this.complexity() +
            '): { "top": ' + this.top + ', "left": ' + this.left + ' }>';
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var o = extend(this.callSuper('toObject', propertiesToInclude), {
            path: this.path.map(function(item) { return item.slice() }),
            pathOffset: this.pathOffset
          });
          if (this.sourcePath) {
            o.sourcePath = this.sourcePath;
          }
          if (this.transformMatrix) {
            o.transformMatrix = this.transformMatrix;
          }
          return o;
        },

        /**
         * Returns dataless object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toDatalessObject: function(propertiesToInclude) {
          var o = this.toObject(propertiesToInclude);
          if (this.sourcePath) {
            o.path = this.sourcePath;
          }
          delete o.sourcePath;
          return o;
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var chunks = [],
              markup = this._createBaseSVGMarkup(), addTransform = '';

          for (var i = 0, len = this.path.length; i < len; i++) {
            chunks.push(this.path[i].join(' '));
          }
          var path = chunks.join(' ');
          if (!(this.group && this.group.type === 'path-group')) {
            addTransform = ' translate(' + (-this.pathOffset.x) + ', ' + (-this.pathOffset.y) + ') ';
          }
          markup.push(
            //jscs:disable validateIndentation
            '<path ',
              'd="', path,
              '" style="', this.getSvgStyles(),
              '" transform="', this.getSvgTransform(), addTransform,
              this.getSvgTransformMatrix(), '" stroke-linecap="round" ',
            '/>\n'
            //jscs:enable validateIndentation
          );

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns number representation of an instance complexity
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return this.path.length;
        },

        /**
         * @private
         */
        _parsePath: function() {
          var result = [ ],
              coords = [ ],
              currentPath,
              parsed,
              re = /([-+]?((\d+\.\d+)|((\d+)|(\.\d+)))(?:e[-+]?\d+)?)/ig,
              match,
              coordsStr;

          for (var i = 0, coordsParsed, len = this.path.length; i < len; i++) {
            currentPath = this.path[i];

            coordsStr = currentPath.slice(1).trim();
            coords.length = 0;

            while ((match = re.exec(coordsStr))) {
              coords.push(match[0]);
            }

            coordsParsed = [ currentPath.charAt(0) ];

            for (var j = 0, jlen = coords.length; j < jlen; j++) {
              parsed = parseFloat(coords[j]);
              Eif (!isNaN(parsed)) {
                coordsParsed.push(parsed);
              }
            }

            var command = coordsParsed[0],
                commandLength = commandLengths[command.toLowerCase()],
                repeatedCommand = repeatedCommands[command] || command;

            if (coordsParsed.length - 1 > commandLength) {
              for (var k = 1, klen = coordsParsed.length; k < klen; k += commandLength) {
                result.push([ command ].concat(coordsParsed.slice(k, k + commandLength)));
                command = repeatedCommand;
              }
            }
            else {
              result.push(coordsParsed);
            }
          }

          return result;
        },

        /**
         * @private
         */
        _parseDimensions: function() {

          var aX = [],
              aY = [],
              current, // current instruction
              previous = null,
              subpathStartX = 0,
              subpathStartY = 0,
              x = 0, // current x
              y = 0, // current y
              controlX = 0, // current control point x
              controlY = 0, // current control point y
              tempX,
              tempY,
              bounds;

          for (var i = 0, len = this.path.length; i < len; ++i) {

            current = this.path[i];

            switch (current[0]) { // first letter

              case 'l': // lineto, relative
                x += current[1];
                y += current[2];
                bounds = [ ];
                break;

              case 'L': // lineto, absolute
                x = current[1];
                y = current[2];
                bounds = [ ];
                break;

              case 'h': // horizontal lineto, relative
                x += current[1];
                bounds = [ ];
                break;

              case 'H': // horizontal lineto, absolute
                x = current[1];
                bounds = [ ];
                break;

              case 'v': // vertical lineto, relative
                y += current[1];
                bounds = [ ];
                break;

              case 'V': // verical lineto, absolute
                y = current[1];
                bounds = [ ];
                break;

              case 'm': // moveTo, relative
                x += current[1];
                y += current[2];
                subpathStartX = x;
                subpathStartY = y;
                bounds = [ ];
                break;

              case 'M': // moveTo, absolute
                x = current[1];
                y = current[2];
                subpathStartX = x;
                subpathStartY = y;
                bounds = [ ];
                break;

              case 'c': // bezierCurveTo, relative
                tempX = x + current[5];
                tempY = y + current[6];
                controlX = x + current[3];
                controlY = y + current[4];
                bounds = fabric.util.getBoundsOfCurve(x, y,
                  x + current[1], // x1
                  y + current[2], // y1
                  controlX, // x2
                  controlY, // y2
                  tempX,
                  tempY
                );
                x = tempX;
                y = tempY;
                break;

              case 'C': // bezierCurveTo, absolute
                x = current[5];
                y = current[6];
                controlX = current[3];
                controlY = current[4];
                bounds = fabric.util.getBoundsOfCurve(x, y,
                  current[1],
                  current[2],
                  controlX,
                  controlY,
                  x,
                  y
                );
                break;

              case 's': // shorthand cubic bezierCurveTo, relative

                // transform to absolute x,y
                tempX = x + current[3];
                tempY = y + current[4];

                if (previous[0].match(/[CcSs]/) === null) {
                  // If there is no previous command or if the previous command was not a C, c, S, or s,
                  // the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control points
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }

                bounds = fabric.util.getBoundsOfCurve(x, y,
                  controlX,
                  controlY,
                  x + current[1],
                  y + current[2],
                  tempX,
                  tempY
                );
                // set control point to 2nd one of this command
                // "... the first control point is assumed to be
                // the reflection of the second control point on
                // the previous command relative to the current point."
                controlX = x + current[1];
                controlY = y + current[2];
                x = tempX;
                y = tempY;
                break;

              case 'S': // shorthand cubic bezierCurveTo, absolute
                tempX = current[3];
                tempY = current[4];
                if (previous[0].match(/[CcSs]/) === null) {
                  // If there is no previous command or if the previous command was not a C, c, S, or s,
                  // the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control points
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }
                bounds = fabric.util.getBoundsOfCurve(x, y,
                  controlX,
                  controlY,
                  current[1],
                  current[2],
                  tempX,
                  tempY
                );
                x = tempX;
                y = tempY;
                // set control point to 2nd one of this command
                // "... the first control point is assumed to be
                // the reflection of the second control point on
                // the previous command relative to the current point."
                controlX = current[1];
                controlY = current[2];
                break;

              case 'q': // quadraticCurveTo, relative
                // transform to absolute x,y
                tempX = x + current[3];
                tempY = y + current[4];
                controlX = x + current[1];
                controlY = y + current[2];
                bounds = fabric.util.getBoundsOfCurve(x, y,
                  controlX,
                  controlY,
                  controlX,
                  controlY,
                  tempX,
                  tempY
                );
                x = tempX;
                y = tempY;
                break;

              case 'Q': // quadraticCurveTo, absolute
                controlX = current[1];
                controlY = current[2];
                bounds = fabric.util.getBoundsOfCurve(x, y,
                  controlX,
                  controlY,
                  controlX,
                  controlY,
                  current[3],
                  current[4]
                );
                x = current[3];
                y = current[4];
                break;

              case 't': // shorthand quadraticCurveTo, relative
                // transform to absolute x,y
                tempX = x + current[1];
                tempY = y + current[2];
                if (previous[0].match(/[QqTt]/) === null) {
                  // If there is no previous command or if the previous command was not a Q, q, T or t,
                  // assume the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control point
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }

                bounds = fabric.util.getBoundsOfCurve(x, y,
                  controlX,
                  controlY,
                  controlX,
                  controlY,
                  tempX,
                  tempY
                );
                x = tempX;
                y = tempY;

                break;

              case 'T':
                tempX = current[1];
                tempY = current[2];

                if (previous[0].match(/[QqTt]/) === null) {
                  // If there is no previous command or if the previous command was not a Q, q, T or t,
                  // assume the control point is coincident with the current point
                  controlX = x;
                  controlY = y;
                }
                else {
                  // calculate reflection of previous control point
                  controlX = 2 * x - controlX;
                  controlY = 2 * y - controlY;
                }
                bounds = fabric.util.getBoundsOfCurve(x, y,
                  controlX,
                  controlY,
                  controlX,
                  controlY,
                  tempX,
                  tempY
                );
                x = tempX;
                y = tempY;
                break;

              case 'a':
                // TODO: optimize this
                bounds = fabric.util.getBoundsOfArc(x, y,
                  current[1],
                  current[2],
                  current[3],
                  current[4],
                  current[5],
                  current[6] + x,
                  current[7] + y
                );
                x += current[6];
                y += current[7];
                break;

              case 'A':
                // TODO: optimize this
                bounds = fabric.util.getBoundsOfArc(x, y,
                  current[1],
                  current[2],
                  current[3],
                  current[4],
                  current[5],
                  current[6],
                  current[7]
                );
                x = current[6];
                y = current[7];
                break;

              case 'z':
              case 'Z':
                x = subpathStartX;
                y = subpathStartY;
                break;
            }
            previous = current;
            bounds.forEach(function (point) {
              aX.push(point.x);
              aY.push(point.y);
            });
            aX.push(x);
            aY.push(y);
          }

          var minX = min(aX) || 0,
              minY = min(aY) || 0,
              maxX = max(aX) || 0,
              maxY = max(aY) || 0,
              deltaX = maxX - minX,
              deltaY = maxY - minY,

              o = {
                left: minX,
                top: minY,
                width: deltaX,
                height: deltaY
              };

          return o;
        }
      });

      /**
       * Creates an instance of fabric.Path from an object
       * @static
       * @memberOf fabric.Path
       * @param {Object} object
       * @param {Function} callback Callback to invoke when an fabric.Path instance is created
       */
      fabric.Path.fromObject = function(object, callback) {
        Iif (typeof object.path === 'string') {
          fabric.loadSVGFromURL(object.path, function (elements) {
            var path = elements[0],
                pathUrl = object.path;

            delete object.path;

            fabric.util.object.extend(path, object);
            path.setSourcePath(pathUrl);

            callback(path);
          });
        }
        else {
          callback(new fabric.Path(object.path, object));
        }
      };

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by `fabric.Path.fromElement`)
       * @static
       * @memberOf fabric.Path
       * @see http://www.w3.org/TR/SVG/paths.html#PathElement
       */
      fabric.Path.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat(['d']);

      /**
       * Creates an instance of fabric.Path from an SVG <path> element
       * @static
       * @memberOf fabric.Path
       * @param {SVGElement} element to parse
       * @param {Function} callback Callback to invoke when an fabric.Path instance is created
       * @param {Object} [options] Options object
       */
      fabric.Path.fromElement = function(element, callback, options) {
        var parsedAttributes = fabric.parseAttributes(element, fabric.Path.ATTRIBUTE_NAMES);
        callback && callback(new fabric.Path(parsedAttributes.d, extend(parsedAttributes, options)));
      };
      /* _FROM_SVG_END_ */

      /**
       * Indicates that instances of this type are async
       * @static
       * @memberOf fabric.Path
       * @type Boolean
       * @default
       */
      fabric.Path.async = true;

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          invoke = fabric.util.array.invoke,
          parentToObject = fabric.Object.prototype.toObject;

      Iif (fabric.PathGroup) {
        fabric.warn('fabric.PathGroup is already defined');
        return;
      }

      /**
       * Path group class
       * @class fabric.PathGroup
       * @extends fabric.Path
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#path_and_pathgroup}
       * @see {@link fabric.PathGroup#initialize} for constructor definition
       */
      fabric.PathGroup = fabric.util.createClass(fabric.Path, /** @lends fabric.PathGroup.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'path-group',

        /**
         * Fill value
         * @type String
         * @default
         */
        fill: '',

        /**
         * Constructor
         * @param {Array} paths
         * @param {Object} [options] Options object
         * @return {fabric.PathGroup} thisArg
         */
        initialize: function(paths, options) {

          options = options || { };
          this.paths = paths || [ ];

          for (var i = this.paths.length; i--;) {
            this.paths[i].group = this;
          }

          if (options.toBeParsed) {
            this.parseDimensionsFromPaths(options);
            delete options.toBeParsed;
          }
          this.setOptions(options);
          this.setCoords();

          Iif (options.sourcePath) {
            this.setSourcePath(options.sourcePath);
          }
        },

        /**
         * Calculate width and height based on paths contained
         */
        parseDimensionsFromPaths: function(options) {
          var points, p, xC = [ ], yC = [ ], path, height, width,
              m;
          for (var j = this.paths.length; j--;) {
            path = this.paths[j];
            height = path.height + path.strokeWidth;
            width = path.width + path.strokeWidth;
            points = [
              { x: path.left, y: path.top },
              { x: path.left + width, y: path.top },
              { x: path.left, y: path.top + height },
              { x: path.left + width, y: path.top + height }
            ];
            m = this.paths[j].transformMatrix;
            for (var i = 0; i < points.length; i++) {
              p = points[i];
              if (m) {
                p = fabric.util.transformPoint(p, m, false);
              }
              xC.push(p.x);
              yC.push(p.y);
            }
          }
          options.width = Math.max.apply(null, xC);
          options.height = Math.max.apply(null, yC);
        },

        /**
         * Renders this group on a specified context
         * @param {CanvasRenderingContext2D} ctx Context to render this instance on
         */
        render: function(ctx) {
          // do not render if object is not visible
          if (!this.visible) {
            return;
          }

          ctx.save();

          if (this.transformMatrix) {
            ctx.transform.apply(ctx, this.transformMatrix);
          }
          this.transform(ctx);

          this._setShadow(ctx);
          this.clipTo && fabric.util.clipContext(this, ctx);
          ctx.translate(-this.width/2, -this.height/2);
          for (var i = 0, l = this.paths.length; i < l; ++i) {
            this.paths[i].render(ctx, true);
          }
          this.clipTo && ctx.restore();
          ctx.restore();
        },

        /**
         * Sets certain property to a certain value
         * @param {String} prop
         * @param {Any} value
         * @return {fabric.PathGroup} thisArg
         */
        _set: function(prop, value) {

          if (prop === 'fill' && value && this.isSameColor()) {
            var i = this.paths.length;
            while (i--) {
              this.paths[i]._set(prop, value);
            }
          }

          return this.callSuper('_set', prop, value);
        },

        /**
         * Returns object representation of this path group
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var o = extend(parentToObject.call(this, propertiesToInclude), {
            paths: invoke(this.getObjects(), 'toObject', propertiesToInclude)
          });
          if (this.sourcePath) {
            o.sourcePath = this.sourcePath;
          }
          return o;
        },

        /**
         * Returns dataless object representation of this path group
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} dataless object representation of an instance
         */
        toDatalessObject: function(propertiesToInclude) {
          var o = this.toObject(propertiesToInclude);
          Eif (this.sourcePath) {
            o.paths = this.sourcePath;
          }
          return o;
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var objects = this.getObjects(),
              p = this.getPointByOrigin('left', 'top'),
              translatePart = 'translate(' + p.x + ' ' + p.y + ')',
              markup = this._createBaseSVGMarkup();
          markup.push(
            '<g ',
            'style="', this.getSvgStyles(), '" ',
            'transform="', this.getSvgTransformMatrix(), translatePart, this.getSvgTransform(), '" ',
            '>\n'
          );

          for (var i = 0, len = objects.length; i < len; i++) {
            markup.push('\t', objects[i].toSVG(reviver));
          }
          markup.push('</g>\n');

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns a string representation of this path group
         * @return {String} string representation of an object
         */
        toString: function() {
          return '#<fabric.PathGroup (' + this.complexity() +
            '): { top: ' + this.top + ', left: ' + this.left + ' }>';
        },

        /**
         * Returns true if all paths in this group are of same color
         * @return {Boolean} true if all paths are of the same color (`fill`)
         */
        isSameColor: function() {
          var firstPathFill = this.getObjects()[0].get('fill') || '';
          Iif (typeof firstPathFill !== 'string') {
            return false;
          }
          firstPathFill = firstPathFill.toLowerCase();
          return this.getObjects().every(function(path) {
            var pathFill = path.get('fill') || '';
            return typeof pathFill === 'string' && (pathFill).toLowerCase() === firstPathFill;
          });
        },

        /**
         * Returns number representation of object's complexity
         * @return {Number} complexity
         */
        complexity: function() {
          return this.paths.reduce(function(total, path) {
            return total + ((path && path.complexity) ? path.complexity() : 0);
          }, 0);
        },

        /**
         * Returns all paths in this path group
         * @return {Array} array of path objects included in this path group
         */
        getObjects: function() {
          return this.paths;
        }
      });

      /**
       * Creates fabric.PathGroup instance from an object representation
       * @static
       * @memberOf fabric.PathGroup
       * @param {Object} object Object to create an instance from
       * @param {Function} callback Callback to invoke when an fabric.PathGroup instance is created
       */
      fabric.PathGroup.fromObject = function(object, callback) {
        Iif (typeof object.paths === 'string') {
          fabric.loadSVGFromURL(object.paths, function (elements) {

            var pathUrl = object.paths;
            delete object.paths;

            var pathGroup = fabric.util.groupSVGElements(elements, object, pathUrl);

            callback(pathGroup);
          });
        }
        else {
          fabric.util.enlivenObjects(object.paths, function(enlivenedObjects) {
            delete object.paths;
            callback(new fabric.PathGroup(enlivenedObjects, object));
          });
        }
      };

      /**
       * Indicates that instances of this type are async
       * @static
       * @memberOf fabric.PathGroup
       * @type Boolean
       * @default
       */
      fabric.PathGroup.async = true;

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          min = fabric.util.array.min,
          max = fabric.util.array.max,
          invoke = fabric.util.array.invoke;

      Iif (fabric.Group) {
        return;
      }

      // lock-related properties, for use in fabric.Group#get
      // to enable locking behavior on group
      // when one of its objects has lock-related properties set
      var _lockProperties = {
        lockMovementX:  true,
        lockMovementY:  true,
        lockRotation:   true,
        lockScalingX:   true,
        lockScalingY:   true,
        lockUniScaling: true
      };

      /**
       * Group class
       * @class fabric.Group
       * @extends fabric.Object
       * @mixes fabric.Collection
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#groups}
       * @see {@link fabric.Group#initialize} for constructor definition
       */
      fabric.Group = fabric.util.createClass(fabric.Object, fabric.Collection, /** @lends fabric.Group.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'group',

        /**
         * Width of stroke
         * @type Number
         * @default
         */
        strokeWidth: 0,

        /**
         * Constructor
         * @param {Object} objects Group objects
         * @param {Object} [options] Options object
         * @param {Boolean} [isAlreadyGrouped] if true, objects have been grouped already.
         * @return {Object} thisArg
         */
        initialize: function(objects, options, isAlreadyGrouped) {
          options = options || { };

          this._objects = [];
          // if objects enclosed in a group have been grouped already,
          // we cannot change properties of objects.
          // Thus we need to set options to group without objects,
          // because delegatedProperties propagate to objects.
          isAlreadyGrouped && this.callSuper('initialize', options);

          this._objects = objects || [];
          for (var i = this._objects.length; i--; ) {
            this._objects[i].group = this;
          }

          this.originalState = { };

          if (options.originX) {
            this.originX = options.originX;
          }
          if (options.originY) {
            this.originY = options.originY;
          }

          if (isAlreadyGrouped) {
            // do not change coordinate of objects enclosed in a group,
            // because objects coordinate system have been group coodinate system already.
            this._updateObjectsCoords(true);
          }
          else {
            this._calcBounds();
            this._updateObjectsCoords();
            this.callSuper('initialize', options);
          }

          this.setCoords();
          this.saveCoords();
        },

        /**
         * @private
         * @param {Boolean} [skipCoordsChange] if true, coordinates of objects enclosed in a group do not change
         */
        _updateObjectsCoords: function(skipCoordsChange) {
          for (var i = this._objects.length; i--; ){
            this._updateObjectCoords(this._objects[i], skipCoordsChange);
          }
        },

        /**
         * @private
         * @param {Object} object
         * @param {Boolean} [skipCoordsChange] if true, coordinates of object dose not change
         */
        _updateObjectCoords: function(object, skipCoordsChange) {
          // do not display corners of objects enclosed in a group
          object.__origHasControls = object.hasControls;
          object.hasControls = false;

          if (skipCoordsChange) {
            return;
          }

          var objectLeft = object.getLeft(),
              objectTop = object.getTop(),
              center = this.getCenterPoint();

          object.set({
            originalLeft: objectLeft,
            originalTop: objectTop,
            left: objectLeft - center.x,
            top: objectTop - center.y
          });
          object.setCoords();
        },

        /**
         * Returns string represenation of a group
         * @return {String}
         */
        toString: function() {
          return '#<fabric.Group: (' + this.complexity() + ')>';
        },

        /**
         * Adds an object to a group; Then recalculates group's dimension, position.
         * @param {Object} object
         * @return {fabric.Group} thisArg
         * @chainable
         */
        addWithUpdate: function(object) {
          this._restoreObjectsState();
          fabric.util.resetObjectTransform(this);
          if (object) {
            this._objects.push(object);
            object.group = this;
            object._set('canvas', this.canvas);
          }
          // since _restoreObjectsState set objects inactive
          this.forEachObject(this._setObjectActive, this);
          this._calcBounds();
          this._updateObjectsCoords();
          return this;
        },

        /**
         * @private
         */
        _setObjectActive: function(object) {
          object.set('active', true);
          object.group = this;
        },

        /**
         * Removes an object from a group; Then recalculates group's dimension, position.
         * @param {Object} object
         * @return {fabric.Group} thisArg
         * @chainable
         */
        removeWithUpdate: function(object) {
          this._restoreObjectsState();
          fabric.util.resetObjectTransform(this);
          // since _restoreObjectsState set objects inactive
          this.forEachObject(this._setObjectActive, this);

          this.remove(object);
          this._calcBounds();
          this._updateObjectsCoords();

          return this;
        },

        /**
         * @private
         */
        _onObjectAdded: function(object) {
          object.group = this;
          object._set('canvas', this.canvas);
        },

        /**
         * @private
         */
        _onObjectRemoved: function(object) {
          delete object.group;
          object.set('active', false);
        },

        /**
         * Properties that are delegated to group objects when reading/writing
         * @param {Object} delegatedProperties
         */
        delegatedProperties: {
          fill:             true,
          stroke:           true,
          strokeWidth:      true,
          fontFamily:       true,
          fontWeight:       true,
          fontSize:         true,
          fontStyle:        true,
          lineHeight:       true,
          textDecoration:   true,
          textAlign:        true,
          backgroundColor:  true
        },

        /**
         * @private
         */
        _set: function(key, value) {
          var i = this._objects.length;

          if (this.delegatedProperties[key] || key === 'canvas') {
            while (i--) {
              this._objects[i].set(key, value);
            }
          }
          else {
            while (i--) {
              this._objects[i].setOnGroup(key, value);
            }
          }

          this.callSuper('_set', key, value);
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return extend(this.callSuper('toObject', propertiesToInclude), {
            objects: invoke(this._objects, 'toObject', propertiesToInclude)
          });
        },

        /**
         * Renders instance on a given context
         * @param {CanvasRenderingContext2D} ctx context to render instance on
         */
        render: function(ctx) {
          // do not render if object is not visible
          Iif (!this.visible) {
            return;
          }

          ctx.save();
          if (this.transformMatrix) {
            ctx.transform.apply(ctx, this.transformMatrix);
          }
          this.transform(ctx);
          this._setShadow(ctx);
          this.clipTo && fabric.util.clipContext(this, ctx);
          // the array is now sorted in order of highest first, so start from end
          for (var i = 0, len = this._objects.length; i < len; i++) {
            this._renderObject(this._objects[i], ctx);
          }

          this.clipTo && ctx.restore();

          ctx.restore();
        },

        /**
         * Renders controls and borders for the object
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Boolean} [noTransform] When true, context is not transformed
         */
        _renderControls: function(ctx, noTransform) {
          this.callSuper('_renderControls', ctx, noTransform);
          for (var i = 0, len = this._objects.length; i < len; i++) {
            this._objects[i]._renderControls(ctx);
          }
        },

        /**
         * @private
         */
        _renderObject: function(object, ctx) {
          // do not render if object is not visible
          Iif (!object.visible) {
            return;
          }

          var originalHasRotatingPoint = object.hasRotatingPoint;
          object.hasRotatingPoint = false;
          object.render(ctx);
          object.hasRotatingPoint = originalHasRotatingPoint;
        },

        /**
         * Retores original state of each of group objects (original state is that which was before group was created).
         * @private
         * @return {fabric.Group} thisArg
         * @chainable
         */
        _restoreObjectsState: function() {
          this._objects.forEach(this._restoreObjectState, this);
          return this;
        },

        /**
         * Realises the transform from this group onto the supplied object
         * i.e. it tells you what would happen if the supplied object was in
         * the group, and then the group was destroyed. It mutates the supplied
         * object.
         * @param {fabric.Object} object
         * @return {fabric.Object} transformedObject
         */
        realizeTransform: function(object) {
          var matrix = object.calcTransformMatrix(),
              options = fabric.util.qrDecompose(matrix),
              center = new fabric.Point(options.translateX, options.translateY);
          object.scaleX = options.scaleX;
          object.scaleY = options.scaleY;
          object.skewX = options.skewX;
          object.skewY = options.skewY;
          object.angle = options.angle;
          object.flipX = false;
          object.flipY = false;
          object.setPositionByOrigin(center, 'center', 'center');
          return object;
        },

        /**
         * Restores original state of a specified object in group
         * @private
         * @param {fabric.Object} object
         * @return {fabric.Group} thisArg
         */
        _restoreObjectState: function(object) {
          this.realizeTransform(object);
          object.setCoords();
          object.hasControls = object.__origHasControls;
          delete object.__origHasControls;
          object.set('active', false);
          delete object.group;

          return this;
        },

        /**
         * Destroys a group (restoring state of its objects)
         * @return {fabric.Group} thisArg
         * @chainable
         */
        destroy: function() {
          return this._restoreObjectsState();
        },

        /**
         * Saves coordinates of this instance (to be used together with `hasMoved`)
         * @saveCoords
         * @return {fabric.Group} thisArg
         * @chainable
         */
        saveCoords: function() {
          this._originalLeft = this.get('left');
          this._originalTop = this.get('top');
          return this;
        },

        /**
         * Checks whether this group was moved (since `saveCoords` was called last)
         * @return {Boolean} true if an object was moved (since fabric.Group#saveCoords was called)
         */
        hasMoved: function() {
          return this._originalLeft !== this.get('left') ||
                 this._originalTop !== this.get('top');
        },

        /**
         * Sets coordinates of all group objects
         * @return {fabric.Group} thisArg
         * @chainable
         */
        setObjectsCoords: function() {
          this.forEachObject(function(object) {
            object.setCoords();
          });
          return this;
        },

        /**
         * @private
         */
        _calcBounds: function(onlyWidthHeight) {
          var aX = [],
              aY = [],
              o, prop,
              props = ['tr', 'br', 'bl', 'tl'],
              i = 0, iLen = this._objects.length,
              j, jLen = props.length;

          for ( ; i < iLen; ++i) {
            o = this._objects[i];
            o.setCoords();
            for (j = 0; j < jLen; j++) {
              prop = props[j];
              aX.push(o.oCoords[prop].x);
              aY.push(o.oCoords[prop].y);
            }
          }

          this.set(this._getBounds(aX, aY, onlyWidthHeight));
        },

        /**
         * @private
         */
        _getBounds: function(aX, aY, onlyWidthHeight) {
          var ivt = fabric.util.invertTransform(this.getViewportTransform()),
              minXY = fabric.util.transformPoint(new fabric.Point(min(aX), min(aY)), ivt),
              maxXY = fabric.util.transformPoint(new fabric.Point(max(aX), max(aY)), ivt),
              obj = {
                width: (maxXY.x - minXY.x) || 0,
                height: (maxXY.y - minXY.y) || 0
              };

          Eif (!onlyWidthHeight) {
            obj.left = minXY.x || 0;
            obj.top = minXY.y || 0;
            Iif (this.originX === 'center') {
              obj.left += obj.width / 2;
            }
            Iif (this.originX === 'right') {
              obj.left += obj.width;
            }
            Iif (this.originY === 'center') {
              obj.top += obj.height / 2;
            }
            Iif (this.originY === 'bottom') {
              obj.top += obj.height;
            }
          }
          return obj;
        },

        /* _TO_SVG_START_ */
        /**
         * Returns svg representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup();
          markup.push(
            '<g transform="',
            /* avoiding styles intentionally */
            this.getSvgTransform(),
            this.getSvgTransformMatrix(),
            '" style="',
            this.getSvgFilter(),
            '">\n'
          );

          for (var i = 0, len = this._objects.length; i < len; i++) {
            markup.push('\t', this._objects[i].toSVG(reviver));
          }

          markup.push('</g>\n');

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns requested property
         * @param {String} prop Property to get
         * @return {Any}
         */
        get: function(prop) {
          if (prop in _lockProperties) {
            if (this[prop]) {
              return this[prop];
            }
            else {
              for (var i = 0, len = this._objects.length; i < len; i++) {
                if (this._objects[i][prop]) {
                  return true;
                }
              }
              return false;
            }
          }
          else {
            if (prop in this.delegatedProperties) {
              return this._objects[0] && this._objects[0].get(prop);
            }
            return this[prop];
          }
        }
      });

      /**
       * Returns {@link fabric.Group} instance from an object representation
       * @static
       * @memberOf fabric.Group
       * @param {Object} object Object to create a group from
       * @param {Function} [callback] Callback to invoke when an group instance is created
       * @return {fabric.Group} An instance of fabric.Group
       */
      fabric.Group.fromObject = function(object, callback) {
        fabric.util.enlivenObjects(object.objects, function(enlivenedObjects) {
          delete object.objects;
          callback && callback(new fabric.Group(enlivenedObjects, object, true));
        });
      };

      /**
       * Indicates that instances of this type are async
       * @static
       * @memberOf fabric.Group
       * @type Boolean
       * @default
       */
      fabric.Group.async = true;

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var extend = fabric.util.object.extend;

      Iif (!global.fabric) {
        global.fabric = { };
      }

      Iif (global.fabric.Image) {
        fabric.warn('fabric.Image is already defined.');
        return;
      }

      /**
       * Image class
       * @class fabric.Image
       * @extends fabric.Object
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#images}
       * @see {@link fabric.Image#initialize} for constructor definition
       */
      fabric.Image = fabric.util.createClass(fabric.Object, /** @lends fabric.Image.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'image',

        /**
         * crossOrigin value (one of "", "anonymous", "use-credentials")
         * @see https://developer.mozilla.org/en-US/docs/HTML/CORS_settings_attributes
         * @type String
         * @default
         */
        crossOrigin: '',

        /**
         * AlignX value, part of preserveAspectRatio (one of "none", "mid", "min", "max")
         * @see http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute
         * This parameter defines how the picture is aligned to its viewport when image element width differs from image width.
         * @type String
         * @default
         */
        alignX: 'none',

        /**
         * AlignY value, part of preserveAspectRatio (one of "none", "mid", "min", "max")
         * @see http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute
         * This parameter defines how the picture is aligned to its viewport when image element height differs from image height.
         * @type String
         * @default
         */
        alignY: 'none',

        /**
         * meetOrSlice value, part of preserveAspectRatio  (one of "meet", "slice").
         * if meet the image is always fully visibile, if slice the viewport is always filled with image.
         * @see http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute
         * @type String
         * @default
         */
        meetOrSlice: 'meet',

        /**
         * Width of a stroke.
         * For image quality a stroke multiple of 2 gives better results.
         * @type Number
         * @default
         */
        strokeWidth: 0,

        /**
         * private
         * contains last value of scaleX to detect
         * if the Image got resized after the last Render
         * @type Number
         */
        _lastScaleX: 1,

        /**
         * private
         * contains last value of scaleY to detect
         * if the Image got resized after the last Render
         * @type Number
         */
        _lastScaleY: 1,

        /**
         * Constructor
         * @param {HTMLImageElement | String} element Image element
         * @param {Object} [options] Options object
         * @return {fabric.Image} thisArg
         */
        initialize: function(element, options) {
          options || (options = { });
          this.filters = [ ];
          this.resizeFilters = [ ];
          this.callSuper('initialize', options);
          this._initElement(element, options);
        },

        /**
         * Returns image element which this instance if based on
         * @return {HTMLImageElement} Image element
         */
        getElement: function() {
          return this._element;
        },

        /**
         * Sets image element for this instance to a specified one.
         * If filters defined they are applied to new image.
         * You might need to call `canvas.renderAll` and `object.setCoords` after replacing, to render new image and update controls area.
         * @param {HTMLImageElement} element
         * @param {Function} [callback] Callback is invoked when all filters have been applied and new image is generated
         * @param {Object} [options] Options object
         * @return {fabric.Image} thisArg
         * @chainable
         */
        setElement: function(element, callback, options) {
          this._element = element;
          this._originalElement = element;
          this._initConfig(options);

          Iif (this.filters.length !== 0) {
            this.applyFilters(callback);
          }
          else Iif (callback) {
            callback();
          }

          return this;
        },

        /**
         * Sets crossOrigin value (on an instance and corresponding image element)
         * @return {fabric.Image} thisArg
         * @chainable
         */
        setCrossOrigin: function(value) {
          this.crossOrigin = value;
          this._element.crossOrigin = value;

          return this;
        },

        /**
         * Returns original size of an image
         * @return {Object} Object with "width" and "height" properties
         */
        getOriginalSize: function() {
          var element = this.getElement();
          return {
            width: element.width,
            height: element.height
          };
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _stroke: function(ctx) {
          Eif (!this.stroke || this.strokeWidth === 0) {
            return;
          }
          var w = this.width / 2, h = this.height / 2;
          ctx.beginPath();
          ctx.moveTo(-w, -h);
          ctx.lineTo(w, -h);
          ctx.lineTo(w, h);
          ctx.lineTo(-w, h);
          ctx.lineTo(-w, -h);
          ctx.closePath();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderDashedStroke: function(ctx) {
          var x = -this.width / 2,
              y = -this.height / 2,
              w = this.width,
              h = this.height;

          ctx.save();
          this._setStrokeStyles(ctx);

          ctx.beginPath();
          fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);
          fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);
          ctx.closePath();
          ctx.restore();
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} Object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var filters = [ ], resizeFilters = [ ],
              element = this._originalElement,
              scaleX = 1, scaleY = 1;

          this.filters.forEach(function(filterObj) {
            Eif (filterObj) {
              Eif (filterObj.type === 'Resize') {
                scaleX *= filterObj.scaleX;
                scaleY *= filterObj.scaleY;
              }
              filters.push(filterObj.toObject());
            }
          });

          this.resizeFilters.forEach(function(filterObj) {
            filterObj && resizeFilters.push(filterObj.toObject());
          });

          var object = extend(this.callSuper('toObject', propertiesToInclude), {
            src: element ? element.src || element._src : '',
            filters: filters,
            resizeFilters: resizeFilters,
            crossOrigin: this.crossOrigin,
            alignX: this.alignX,
            alignY: this.alignY,
            meetOrSlice: this.meetOrSlice
          });

          object.width /= scaleX;
          object.height /= scaleY;

          Iif (!this.includeDefaultValues) {
            this._removeDefaultValues(object);
          }

          return object;
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(), x = -this.width / 2, y = -this.height / 2,
              preserveAspectRatio = 'none';
          Iif (this.group && this.group.type === 'path-group') {
            x = this.left;
            y = this.top;
          }
          Iif (this.alignX !== 'none' && this.alignY !== 'none') {
            preserveAspectRatio = 'x' + this.alignX + 'Y' + this.alignY + ' ' + this.meetOrSlice;
          }
          markup.push(
            '<g transform="', this.getSvgTransform(), this.getSvgTransformMatrix(), '">\n',
              '<image xlink:href="', this.getSvgSrc(),
                '" x="', x, '" y="', y,
                '" style="', this.getSvgStyles(),
                // we're essentially moving origin of transformation from top/left corner to the center of the shape
                // by wrapping it in container <g> element with actual transformation, then offsetting object to the top/left
                // so that object's center aligns with container's left/top
                '" width="', this.width,
                '" height="', this.height,
                '" preserveAspectRatio="', preserveAspectRatio, '"',
              '></image>\n'
          );

          Iif (this.stroke || this.strokeDashArray) {
            var origFill = this.fill;
            this.fill = null;
            markup.push(
              '<rect ',
                'x="', x, '" y="', y,
                '" width="', this.width, '" height="', this.height,
                '" style="', this.getSvgStyles(),
              '"/>\n'
            );
            this.fill = origFill;
          }

          markup.push('</g>\n');

          return reviver ? reviver(markup.join('')) : markup.join('');
        },
        /* _TO_SVG_END_ */

        /**
         * Returns source of an image
         * @return {String} Source of an image
         */
        getSrc: function() {
          Eif (this.getElement()) {
            return this.getElement().src || this.getElement()._src;
          }
        },

        /**
         * Sets source of an image
         * @param {String} src Source string (URL)
         * @param {Function} [callback] Callback is invoked when image has been loaded (and all filters have been applied)
         * @param {Object} [options] Options object
         * @return {fabric.Image} thisArg
         * @chainable
         */
        setSrc: function(src, callback, options) {
          fabric.util.loadImage(src, function(img) {
            return this.setElement(img, callback, options);
          }, this, options && options.crossOrigin);
        },

        /**
         * Returns string representation of an instance
         * @return {String} String representation of an instance
         */
        toString: function() {
          return '#<fabric.Image: { src: "' + this.getSrc() + '" }>';
        },

        /**
         * Returns a clone of an instance
         * @param {Function} callback Callback is invoked with a clone as a first argument
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         */
        clone: function(callback, propertiesToInclude) {
          this.constructor.fromObject(this.toObject(propertiesToInclude), callback);
        },

        /**
         * Applies filters assigned to this image (from "filters" array)
         * @method applyFilters
         * @param {Function} callback Callback is invoked when all filters have been applied and new image is generated
         * @return {fabric.Image} thisArg
         * @chainable
         */
        applyFilters: function(callback, filters, imgElement, forResizing) {

          filters = filters || this.filters;
          imgElement = imgElement || this._originalElement;

          Iif (!imgElement) {
            return;
          }

          var imgEl = imgElement,
              canvasEl = fabric.util.createCanvasElement(),
              replacement = fabric.util.createImage(),
              _this = this;

          canvasEl.width = imgEl.width;
          canvasEl.height = imgEl.height;
          canvasEl.getContext('2d').drawImage(imgEl, 0, 0, imgEl.width, imgEl.height);

          Iif (filters.length === 0) {
            this._element = imgElement;
            callback && callback();
            return canvasEl;
          }
          filters.forEach(function(filter) {
            filter && filter.applyTo(canvasEl, filter.scaleX || _this.scaleX, filter.scaleY || _this.scaleY);
            Eif (!forResizing && filter && filter.type === 'Resize') {
              _this.width *= filter.scaleX;
              _this.height *= filter.scaleY;
            }
          });

          /** @ignore */
          replacement.width = canvasEl.width;
          replacement.height = canvasEl.height;

          Eif (fabric.isLikelyNode) {
            replacement.src = canvasEl.toBuffer(undefined, fabric.Image.pngCompression);
            // onload doesn't fire in some node versions, so we invoke callback manually
            _this._element = replacement;
            !forResizing && (_this._filteredEl = replacement);
            callback && callback();
          }
          else {
            replacement.onload = function() {
              _this._element = replacement;
              !forResizing && (_this._filteredEl = replacement);
              callback && callback();
              replacement.onload = canvasEl = imgEl = null;
            };
            replacement.src = canvasEl.toDataURL('image/png');
          }
          return canvasEl;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx, noTransform) {
          var x, y, imageMargins = this._findMargins(), elementToDraw;

          x = (noTransform ? this.left : -this.width / 2);
          y = (noTransform ? this.top : -this.height / 2);

          Iif (this.meetOrSlice === 'slice') {
            ctx.beginPath();
            ctx.rect(x, y, this.width, this.height);
            ctx.clip();
          }

          Iif (this.isMoving === false && this.resizeFilters.length && this._needsResize()) {
            this._lastScaleX = this.scaleX;
            this._lastScaleY = this.scaleY;
            elementToDraw = this.applyFilters(null, this.resizeFilters, this._filteredEl || this._originalElement, true);
          }
          else {
            elementToDraw = this._element;
          }
          elementToDraw && ctx.drawImage(elementToDraw,
                                         x + imageMargins.marginX,
                                         y + imageMargins.marginY,
                                         imageMargins.width,
                                         imageMargins.height
                                        );

          this._stroke(ctx);
          this._renderStroke(ctx);
        },

        /**
         * @private, needed to check if image needs resize
         */
        _needsResize: function() {
          return (this.scaleX !== this._lastScaleX || this.scaleY !== this._lastScaleY);
        },

        /**
         * @private
         */
        _findMargins: function() {
          var width = this.width, height = this.height, scales,
              scale, marginX = 0, marginY = 0;

          Iif (this.alignX !== 'none' || this.alignY !== 'none') {
            scales = [this.width / this._element.width, this.height / this._element.height];
            scale = this.meetOrSlice === 'meet'
                    ? Math.min.apply(null, scales) : Math.max.apply(null, scales);
            width = this._element.width * scale;
            height = this._element.height * scale;
            if (this.alignX === 'Mid') {
              marginX = (this.width - width) / 2;
            }
            if (this.alignX === 'Max') {
              marginX = this.width - width;
            }
            if (this.alignY === 'Mid') {
              marginY = (this.height - height) / 2;
            }
            if (this.alignY === 'Max') {
              marginY = this.height - height;
            }
          }
          return {
            width:  width,
            height: height,
            marginX: marginX,
            marginY: marginY
          };
        },

        /**
         * @private
         */
        _resetWidthHeight: function() {
          var element = this.getElement();

          this.set('width', element.width);
          this.set('height', element.height);
        },

        /**
         * The Image class's initialization method. This method is automatically
         * called by the constructor.
         * @private
         * @param {HTMLImageElement|String} element The element representing the image
         * @param {Object} [options] Options object
         */
        _initElement: function(element, options) {
          this.setElement(fabric.util.getById(element), null, options);
          fabric.util.addClass(this.getElement(), fabric.Image.CSS_CANVAS);
        },

        /**
         * @private
         * @param {Object} [options] Options object
         */
        _initConfig: function(options) {
          options || (options = { });
          this.setOptions(options);
          this._setWidthHeight(options);
          Iif (this._element && this.crossOrigin) {
            this._element.crossOrigin = this.crossOrigin;
          }
        },

        /**
         * @private
         * @param {Array} filters to be initialized
         * @param {Function} callback Callback to invoke when all fabric.Image.filters instances are created
         */
        _initFilters: function(filters, callback) {
          if (filters && filters.length) {
            fabric.util.enlivenObjects(filters, function(enlivenedObjects) {
              callback && callback(enlivenedObjects);
            }, 'fabric.Image.filters');
          }
          else {
            callback && callback();
          }
        },

        /**
         * @private
         * @param {Object} [options] Object with width/height properties
         */
        _setWidthHeight: function(options) {
          this.width = 'width' in options
            ? options.width
            : (this.getElement()
                ? this.getElement().width || 0
                : 0);

          this.height = 'height' in options
            ? options.height
            : (this.getElement()
                ? this.getElement().height || 0
                : 0);
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity of this instance
         */
        complexity: function() {
          return 1;
        }
      });

      /**
       * Default CSS class name for canvas
       * @static
       * @type String
       * @default
       */
      fabric.Image.CSS_CANVAS = 'canvas-img';

      /**
       * Alias for getSrc
       * @static
       */
      fabric.Image.prototype.getSvgSrc = fabric.Image.prototype.getSrc;

      /**
       * Creates an instance of fabric.Image from its object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @param {Function} [callback] Callback to invoke when an image instance is created
       */
      fabric.Image.fromObject = function(object, callback) {
        fabric.util.loadImage(object.src, function(img) {
          fabric.Image.prototype._initFilters.call(object, object.filters, function(filters) {
            object.filters = filters || [ ];
            fabric.Image.prototype._initFilters.call(object, object.resizeFilters, function(resizeFilters) {
              object.resizeFilters = resizeFilters || [ ];
              var instance = new fabric.Image(img, object);
              callback && callback(instance);
            });
          });
        }, null, object.crossOrigin);
      };

      /**
       * Creates an instance of fabric.Image from an URL string
       * @static
       * @param {String} url URL to create an image from
       * @param {Function} [callback] Callback to invoke when image is created (newly created image is passed as a first argument)
       * @param {Object} [imgOptions] Options object
       */
      fabric.Image.fromURL = function(url, callback, imgOptions) {
        fabric.util.loadImage(url, function(img) {
          callback && callback(new fabric.Image(img, imgOptions));
        }, null, imgOptions && imgOptions.crossOrigin);
      };

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by {@link fabric.Image.fromElement})
       * @static
       * @see {@link http://www.w3.org/TR/SVG/struct.html#ImageElement}
       */
      fabric.Image.ATTRIBUTE_NAMES =
        fabric.SHARED_ATTRIBUTES.concat('x y width height preserveAspectRatio xlink:href'.split(' '));

      /**
       * Returns {@link fabric.Image} instance from an SVG element
       * @static
       * @param {SVGElement} element Element to parse
       * @param {Function} callback Callback to execute when fabric.Image object is created
       * @param {Object} [options] Options object
       * @return {fabric.Image} Instance of fabric.Image
       */
      fabric.Image.fromElement = function(element, callback, options) {
        var parsedAttributes = fabric.parseAttributes(element, fabric.Image.ATTRIBUTE_NAMES),
            preserveAR;

        if (parsedAttributes.preserveAspectRatio) {
          preserveAR = fabric.util.parsePreserveAspectRatioAttribute(parsedAttributes.preserveAspectRatio);
          extend(parsedAttributes, preserveAR);
        }

        fabric.Image.fromURL(parsedAttributes['xlink:href'], callback,
          extend((options ? fabric.util.object.clone(options) : { }), parsedAttributes));
      };
      /* _FROM_SVG_END_ */

      /**
       * Indicates that instances of this type are async
       * @static
       * @type Boolean
       * @default
       */
      fabric.Image.async = true;

      /**
       * Indicates compression level used when generating PNG under Node (in applyFilters). Any of 0-9
       * @static
       * @type Number
       * @default
       */
      fabric.Image.pngCompression = 1;

    })(typeof exports !== 'undefined' ? exports : this);

    fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {

      /**
       * @private
       * @return {Number} angle value
       */
      _getAngleValueForStraighten: function() {
        var angle = this.getAngle() % 360;
        if (angle > 0) {
          return Math.round((angle - 1) / 90) * 90;
        }
        return Math.round(angle / 90) * 90;
      },

      /**
       * Straightens an object (rotating it from current angle to one of 0, 90, 180, 270, etc. depending on which is closer)
       * @return {fabric.Object} thisArg
       * @chainable
       */
      straighten: function() {
        this.setAngle(this._getAngleValueForStraighten());
        return this;
      },

      /**
       * Same as {@link fabric.Object.prototype.straighten} but with animation
       * @param {Object} callbacks Object with callback functions
       * @param {Function} [callbacks.onComplete] Invoked on completion
       * @param {Function} [callbacks.onChange] Invoked on every step of animation
       * @return {fabric.Object} thisArg
       * @chainable
       */
      fxStraighten: function(callbacks) {
        callbacks = callbacks || { };

        var empty = function() { },
            onComplete = callbacks.onComplete || empty,
            onChange = callbacks.onChange || empty,
            _this = this;

        fabric.util.animate({
          startValue: this.get('angle'),
          endValue: this._getAngleValueForStraighten(),
          duration: this.FX_DURATION,
          onChange: function(value) {
            _this.setAngle(value);
            onChange();
          },
          onComplete: function() {
            _this.setCoords();
            onComplete();
          },
          onStart: function() {
            _this.set('active', false);
          }
        });

        return this;
      }
    });

    fabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {

      /**
       * Straightens object, then rerenders canvas
       * @param {fabric.Object} object Object to straighten
       * @return {fabric.Canvas} thisArg
       * @chainable
       */
      straightenObject: function (object) {
        object.straighten();
        this.renderAll();
        return this;
      },

      /**
       * Same as {@link fabric.Canvas.prototype.straightenObject}, but animated
       * @param {fabric.Object} object Object to straighten
       * @return {fabric.Canvas} thisArg
       * @chainable
       */
      fxStraightenObject: function (object) {
        object.fxStraighten({
          onChange: this.renderAll.bind(this)
        });
        return this;
      }
    });

    /**
     * @namespace fabric.Image.filters
     * @memberOf fabric.Image
     * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#image_filters}
     * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
     */
    fabric.Image.filters = fabric.Image.filters || { };

    /**
     * Root filter class from which all filter classes inherit from
     * @class fabric.Image.filters.BaseFilter
     * @memberOf fabric.Image.filters
     */
    fabric.Image.filters.BaseFilter = fabric.util.createClass(/** @lends fabric.Image.filters.BaseFilter.prototype */ {

      /**
       * Filter type
       * @param {String} type
       * @default
       */
      type: 'BaseFilter',

      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      initialize: function(options) {
        if (options) {
          this.setOptions(options);
        }
      },

      /**
       * Sets filter's properties from options
       * @param {Object} [options] Options object
       */
      setOptions: function(options) {
        for (var prop in options) {
          this[prop] = options[prop];
        }
      },

      /**
       * Returns object representation of an instance
       * @return {Object} Object representation of an instance
       */
      toObject: function() {
        return { type: this.type };
      },

      /**
       * Returns a JSON representation of an instance
       * @return {Object} JSON
       */
      toJSON: function() {
        // delegate, not alias
        return this.toObject();
      }
    });

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Brightness filter class
       * @class fabric.Image.filters.Brightness
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.Brightness#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Brightness({
       *   brightness: 200
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Brightness = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Brightness.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Brightness',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Brightness.prototype
         * @param {Object} [options] Options object
         * @param {Number} [options.brightness=0] Value to brighten the image up (0..255)
         */
        initialize: function(options) {
          options = options || { };
          this.brightness = options.brightness || 0;
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              brightness = this.brightness;

          for (var i = 0, len = data.length; i < len; i += 4) {
            data[i] += brightness;
            data[i + 1] += brightness;
            data[i + 2] += brightness;
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            brightness: this.brightness
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.Brightness} Instance of fabric.Image.filters.Brightness
       */
      fabric.Image.filters.Brightness.fromObject = function(object) {
        return new fabric.Image.filters.Brightness(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Adapted from <a href="http://www.html5rocks.com/en/tutorials/canvas/imagefilters/">html5rocks article</a>
       * @class fabric.Image.filters.Convolute
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.Convolute#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example <caption>Sharpen filter</caption>
       * var filter = new fabric.Image.filters.Convolute({
       *   matrix: [ 0, -1,  0,
       *            -1,  5, -1,
       *             0, -1,  0 ]
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       * @example <caption>Blur filter</caption>
       * var filter = new fabric.Image.filters.Convolute({
       *   matrix: [ 1/9, 1/9, 1/9,
       *             1/9, 1/9, 1/9,
       *             1/9, 1/9, 1/9 ]
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       * @example <caption>Emboss filter</caption>
       * var filter = new fabric.Image.filters.Convolute({
       *   matrix: [ 1,   1,  1,
       *             1, 0.7, -1,
       *            -1,  -1, -1 ]
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       * @example <caption>Emboss filter with opaqueness</caption>
       * var filter = new fabric.Image.filters.Convolute({
       *   opaque: true,
       *   matrix: [ 1,   1,  1,
       *             1, 0.7, -1,
       *            -1,  -1, -1 ]
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Convolute = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Convolute.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Convolute',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Convolute.prototype
         * @param {Object} [options] Options object
         * @param {Boolean} [options.opaque=false] Opaque value (true/false)
         * @param {Array} [options.matrix] Filter matrix
         */
        initialize: function(options) {
          options = options || { };

          this.opaque = options.opaque;
          this.matrix = options.matrix || [
            0, 0, 0,
            0, 1, 0,
            0, 0, 0
          ];
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {

          var weights = this.matrix,
              context = canvasEl.getContext('2d'),
              pixels = context.getImageData(0, 0, canvasEl.width, canvasEl.height),

              side = Math.round(Math.sqrt(weights.length)),
              halfSide = Math.floor(side/2),
              src = pixels.data,
              sw = pixels.width,
              sh = pixels.height,
              output = context.createImageData(sw, sh),
              dst = output.data,
              // go through the destination image pixels
              alphaFac = this.opaque ? 1 : 0,
              r, g, b, a, dstOff,
              scx, scy, srcOff, wt;

          for (var y = 0; y < sh; y++) {
            for (var x = 0; x < sw; x++) {
              dstOff = (y * sw + x) * 4;
              // calculate the weighed sum of the source image pixels that
              // fall under the convolution matrix
              r = 0; g = 0; b = 0; a = 0;

              for (var cy = 0; cy < side; cy++) {
                for (var cx = 0; cx < side; cx++) {
                  scy = y + cy - halfSide;
                  scx = x + cx - halfSide;

                  /* jshint maxdepth:5 */
                  if (scy < 0 || scy > sh || scx < 0 || scx > sw) {
                    continue;
                  }

                  srcOff = (scy * sw + scx) * 4;
                  wt = weights[cy * side + cx];

                  r += src[srcOff] * wt;
                  g += src[srcOff + 1] * wt;
                  b += src[srcOff + 2] * wt;
                  a += src[srcOff + 3] * wt;
                }
              }
              dst[dstOff] = r;
              dst[dstOff + 1] = g;
              dst[dstOff + 2] = b;
              dst[dstOff + 3] = a + alphaFac * (255 - a);
            }
          }

          context.putImageData(output, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            opaque: this.opaque,
            matrix: this.matrix
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.Convolute} Instance of fabric.Image.filters.Convolute
       */
      fabric.Image.filters.Convolute.fromObject = function(object) {
        return new fabric.Image.filters.Convolute(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * GradientTransparency filter class
       * @class fabric.Image.filters.GradientTransparency
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.GradientTransparency#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.GradientTransparency({
       *   threshold: 200
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.GradientTransparency = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.GradientTransparency.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'GradientTransparency',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.GradientTransparency.prototype
         * @param {Object} [options] Options object
         * @param {Number} [options.threshold=100] Threshold value
         */
        initialize: function(options) {
          options = options || { };
          this.threshold = options.threshold || 100;
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              threshold = this.threshold,
              total = data.length;

          for (var i = 0, len = data.length; i < len; i += 4) {
            data[i + 3] = threshold + 255 * (total - i) / total;
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            threshold: this.threshold
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.GradientTransparency} Instance of fabric.Image.filters.GradientTransparency
       */
      fabric.Image.filters.GradientTransparency.fromObject = function(object) {
        return new fabric.Image.filters.GradientTransparency(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { });

      /**
       * Grayscale image filter class
       * @class fabric.Image.filters.Grayscale
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Grayscale();
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Grayscale = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Grayscale.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Grayscale',

        /**
         * Applies filter to canvas element
         * @memberOf fabric.Image.filters.Grayscale.prototype
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              len = imageData.width * imageData.height * 4,
              index = 0,
              average;

          while (index < len) {
            average = (data[index] + data[index + 1] + data[index + 2]) / 3;
            data[index]     = average;
            data[index + 1] = average;
            data[index + 2] = average;
            index += 4;
          }

          context.putImageData(imageData, 0, 0);
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @return {fabric.Image.filters.Grayscale} Instance of fabric.Image.filters.Grayscale
       */
      fabric.Image.filters.Grayscale.fromObject = function() {
        return new fabric.Image.filters.Grayscale();
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { });

      /**
       * Invert filter class
       * @class fabric.Image.filters.Invert
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Invert();
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Invert = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Invert.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Invert',

        /**
         * Applies filter to canvas element
         * @memberOf fabric.Image.filters.Invert.prototype
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              iLen = data.length, i;

          for (i = 0; i < iLen; i+=4) {
            data[i] = 255 - data[i];
            data[i + 1] = 255 - data[i + 1];
            data[i + 2] = 255 - data[i + 2];
          }

          context.putImageData(imageData, 0, 0);
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @return {fabric.Image.filters.Invert} Instance of fabric.Image.filters.Invert
       */
      fabric.Image.filters.Invert.fromObject = function() {
        return new fabric.Image.filters.Invert();
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Mask filter class
       * See http://resources.aleph-1.com/mask/
       * @class fabric.Image.filters.Mask
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.Mask#initialize} for constructor definition
       */
      fabric.Image.filters.Mask = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Mask.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Mask',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Mask.prototype
         * @param {Object} [options] Options object
         * @param {fabric.Image} [options.mask] Mask image object
         * @param {Number} [options.channel=0] Rgb channel (0, 1, 2 or 3)
         */
        initialize: function(options) {
          options = options || { };

          this.mask = options.mask;
          this.channel = [ 0, 1, 2, 3 ].indexOf(options.channel) > -1 ? options.channel : 0;
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          if (!this.mask) {
            return;
          }

          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              maskEl = this.mask.getElement(),
              maskCanvasEl = fabric.util.createCanvasElement(),
              channel = this.channel,
              i,
              iLen = imageData.width * imageData.height * 4;

          maskCanvasEl.width = canvasEl.width;
          maskCanvasEl.height = canvasEl.height;

          maskCanvasEl.getContext('2d').drawImage(maskEl, 0, 0, canvasEl.width, canvasEl.height);

          var maskImageData = maskCanvasEl.getContext('2d').getImageData(0, 0, canvasEl.width, canvasEl.height),
              maskData = maskImageData.data;

          for (i = 0; i < iLen; i += 4) {
            data[i + 3] = maskData[i + channel];
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            mask: this.mask.toObject(),
            channel: this.channel
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @param {Function} [callback] Callback to invoke when a mask filter instance is created
       */
      fabric.Image.filters.Mask.fromObject = function(object, callback) {
        fabric.util.loadImage(object.mask.src, function(img) {
          object.mask = new fabric.Image(img, object.mask);
          callback && callback(new fabric.Image.filters.Mask(object));
        });
      };

      /**
       * Indicates that instances of this type are async
       * @static
       * @type Boolean
       * @default
       */
      fabric.Image.filters.Mask.async = true;

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Noise filter class
       * @class fabric.Image.filters.Noise
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.Noise#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Noise({
       *   noise: 700
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Noise = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Noise.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Noise',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Noise.prototype
         * @param {Object} [options] Options object
         * @param {Number} [options.noise=0] Noise value
         */
        initialize: function(options) {
          options = options || { };
          this.noise = options.noise || 0;
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              noise = this.noise, rand;

          for (var i = 0, len = data.length; i < len; i += 4) {

            rand = (0.5 - Math.random()) * noise;

            data[i] += rand;
            data[i + 1] += rand;
            data[i + 2] += rand;
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            noise: this.noise
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.Noise} Instance of fabric.Image.filters.Noise
       */
      fabric.Image.filters.Noise.fromObject = function(object) {
        return new fabric.Image.filters.Noise(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Pixelate filter class
       * @class fabric.Image.filters.Pixelate
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.Pixelate#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Pixelate({
       *   blocksize: 8
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Pixelate = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Pixelate.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Pixelate',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Pixelate.prototype
         * @param {Object} [options] Options object
         * @param {Number} [options.blocksize=4] Blocksize for pixelate
         */
        initialize: function(options) {
          options = options || { };
          this.blocksize = options.blocksize || 4;
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              iLen = imageData.height,
              jLen = imageData.width,
              index, i, j, r, g, b, a;

          for (i = 0; i < iLen; i += this.blocksize) {
            for (j = 0; j < jLen; j += this.blocksize) {

              index = (i * 4) * jLen + (j * 4);

              r = data[index];
              g = data[index + 1];
              b = data[index + 2];
              a = data[index + 3];

              /*
               blocksize: 4

               [1,x,x,x,1]
               [x,x,x,x,1]
               [x,x,x,x,1]
               [x,x,x,x,1]
               [1,1,1,1,1]
               */

              for (var _i = i, _ilen = i + this.blocksize; _i < _ilen; _i++) {
                for (var _j = j, _jlen = j + this.blocksize; _j < _jlen; _j++) {
                  index = (_i * 4) * jLen + (_j * 4);
                  data[index] = r;
                  data[index + 1] = g;
                  data[index + 2] = b;
                  data[index + 3] = a;
                }
              }
            }
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            blocksize: this.blocksize
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.Pixelate} Instance of fabric.Image.filters.Pixelate
       */
      fabric.Image.filters.Pixelate.fromObject = function(object) {
        return new fabric.Image.filters.Pixelate(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Remove white filter class
       * @class fabric.Image.filters.RemoveWhite
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.RemoveWhite#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.RemoveWhite({
       *   threshold: 40,
       *   distance: 140
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.RemoveWhite = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.RemoveWhite.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'RemoveWhite',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.RemoveWhite.prototype
         * @param {Object} [options] Options object
         * @param {Number} [options.threshold=30] Threshold value
         * @param {Number} [options.distance=20] Distance value
         */
        initialize: function(options) {
          options = options || { };
          this.threshold = options.threshold || 30;
          this.distance = options.distance || 20;
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              threshold = this.threshold,
              distance = this.distance,
              limit = 255 - threshold,
              abs = Math.abs,
              r, g, b;

          for (var i = 0, len = data.length; i < len; i += 4) {
            r = data[i];
            g = data[i + 1];
            b = data[i + 2];

            if (r > limit &&
                g > limit &&
                b > limit &&
                abs(r - g) < distance &&
                abs(r - b) < distance &&
                abs(g - b) < distance
            ) {
              data[i + 3] = 0;
            }
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            threshold: this.threshold,
            distance: this.distance
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.RemoveWhite} Instance of fabric.Image.filters.RemoveWhite
       */
      fabric.Image.filters.RemoveWhite.fromObject = function(object) {
        return new fabric.Image.filters.RemoveWhite(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { });

      /**
       * Sepia filter class
       * @class fabric.Image.filters.Sepia
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Sepia();
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Sepia = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Sepia.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Sepia',

        /**
         * Applies filter to canvas element
         * @memberOf fabric.Image.filters.Sepia.prototype
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              iLen = data.length, i, avg;

          for (i = 0; i < iLen; i+=4) {
            avg = 0.3  * data[i] + 0.59 * data[i + 1] + 0.11 * data[i + 2];
            data[i] = avg + 100;
            data[i + 1] = avg + 50;
            data[i + 2] = avg + 255;
          }

          context.putImageData(imageData, 0, 0);
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @return {fabric.Image.filters.Sepia} Instance of fabric.Image.filters.Sepia
       */
      fabric.Image.filters.Sepia.fromObject = function() {
        return new fabric.Image.filters.Sepia();
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { });

      /**
       * Sepia2 filter class
       * @class fabric.Image.filters.Sepia2
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Sepia2();
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Sepia2 = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Sepia2.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Sepia2',

        /**
         * Applies filter to canvas element
         * @memberOf fabric.Image.filters.Sepia.prototype
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              iLen = data.length, i, r, g, b;

          for (i = 0; i < iLen; i+=4) {
            r = data[i];
            g = data[i + 1];
            b = data[i + 2];

            data[i] = (r * 0.393 + g * 0.769 + b * 0.189 ) / 1.351;
            data[i + 1] = (r * 0.349 + g * 0.686 + b * 0.168 ) / 1.203;
            data[i + 2] = (r * 0.272 + g * 0.534 + b * 0.131 ) / 2.140;
          }

          context.putImageData(imageData, 0, 0);
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @return {fabric.Image.filters.Sepia2} Instance of fabric.Image.filters.Sepia2
       */
      fabric.Image.filters.Sepia2.fromObject = function() {
        return new fabric.Image.filters.Sepia2();
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Tint filter class
       * Adapted from <a href="https://github.com/mezzoblue/PaintbrushJS">https://github.com/mezzoblue/PaintbrushJS</a>
       * @class fabric.Image.filters.Tint
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link fabric.Image.filters.Tint#initialize} for constructor definition
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example <caption>Tint filter with hex color and opacity</caption>
       * var filter = new fabric.Image.filters.Tint({
       *   color: '#3513B0',
       *   opacity: 0.5
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       * @example <caption>Tint filter with rgba color</caption>
       * var filter = new fabric.Image.filters.Tint({
       *   color: 'rgba(53, 21, 176, 0.5)'
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Tint = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Tint.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Tint',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Tint.prototype
         * @param {Object} [options] Options object
         * @param {String} [options.color=#000000] Color to tint the image with
         * @param {Number} [options.opacity] Opacity value that controls the tint effect's transparency (0..1)
         */
        initialize: function(options) {
          options = options || { };

          this.color = options.color || '#000000';
          this.opacity = typeof options.opacity !== 'undefined'
                          ? options.opacity
                          : new fabric.Color(this.color).getAlpha();
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              iLen = data.length, i,
              tintR, tintG, tintB,
              r, g, b, alpha1,
              source;

          source = new fabric.Color(this.color).getSource();

          tintR = source[0] * this.opacity;
          tintG = source[1] * this.opacity;
          tintB = source[2] * this.opacity;

          alpha1 = 1 - this.opacity;

          for (i = 0; i < iLen; i+=4) {
            r = data[i];
            g = data[i + 1];
            b = data[i + 2];

            // alpha compositing
            data[i] = tintR + r * alpha1;
            data[i + 1] = tintG + g * alpha1;
            data[i + 2] = tintB + b * alpha1;
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            color: this.color,
            opacity: this.opacity
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.Tint} Instance of fabric.Image.filters.Tint
       */
      fabric.Image.filters.Tint.fromObject = function(object) {
        return new fabric.Image.filters.Tint(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend;

      /**
       * Multiply filter class
       * Adapted from <a href="http://www.laurenscorijn.com/articles/colormath-basics">http://www.laurenscorijn.com/articles/colormath-basics</a>
       * @class fabric.Image.filters.Multiply
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @example <caption>Multiply filter with hex color</caption>
       * var filter = new fabric.Image.filters.Multiply({
       *   color: '#F0F'
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       * @example <caption>Multiply filter with rgb color</caption>
       * var filter = new fabric.Image.filters.Multiply({
       *   color: 'rgb(53, 21, 176)'
       * });
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Multiply = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Multiply.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Multiply',

        /**
         * Constructor
         * @memberOf fabric.Image.filters.Multiply.prototype
         * @param {Object} [options] Options object
         * @param {String} [options.color=#000000] Color to multiply the image pixels with
         */
        initialize: function(options) {
          options = options || { };

          this.color = options.color || '#000000';
        },

        /**
         * Applies filter to canvas element
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              iLen = data.length, i,
              source;

          source = new fabric.Color(this.color).getSource();

          for (i = 0; i < iLen; i+=4) {
            data[i] *= source[0] / 255;
            data[i + 1] *= source[1] / 255;
            data[i + 2] *= source[2] / 255;
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return extend(this.callSuper('toObject'), {
            color: this.color
          });
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @param {Object} object Object to create an instance from
       * @return {fabric.Image.filters.Multiply} Instance of fabric.Image.filters.Multiply
       */
      fabric.Image.filters.Multiply.fromObject = function(object) {
        return new fabric.Image.filters.Multiply(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {
      'use strict';

      var fabric = global.fabric;

      /**
       * Color Blend filter class
       * @class fabric.Image.filter.Blend
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @example
       * var filter = new fabric.Image.filters.Blend({
       *  color: '#000',
       *  mode: 'multiply'
       * });
       *
       * var filter = new fabric.Image.filters.Blend({
       *  image: fabricImageObject,
       *  mode: 'multiply',
       *  alpha: 0.5
       * });

       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Blend = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Blend.prototype */{
        type: 'Blend',

        initialize: function(options) {
          options = options || {};
          this.color = options.color || '#000';
          this.image = options.image || false;
          this.mode = options.mode || 'multiply';
          this.alpha = options.alpha || 1;
        },

        applyTo: function(canvasEl) {
          var context = canvasEl.getContext('2d'),
              imageData = context.getImageData(0, 0, canvasEl.width, canvasEl.height),
              data = imageData.data,
              tr, tg, tb,
              r, g, b,
              _r, _g, _b,
              source,
              isImage = false;

          if (this.image) {
            // Blend images
            isImage = true;

            var _el = fabric.util.createCanvasElement();
            _el.width = this.image.width;
            _el.height = this.image.height;

            var tmpCanvas = new fabric.StaticCanvas(_el);
            tmpCanvas.add(this.image);
            var context2 =  tmpCanvas.getContext('2d');
            source = context2.getImageData(0, 0, tmpCanvas.width, tmpCanvas.height).data;
          }
          else {
            // Blend color
            source = new fabric.Color(this.color).getSource();

            tr = source[0] * this.alpha;
            tg = source[1] * this.alpha;
            tb = source[2] * this.alpha;
          }

          for (var i = 0, len = data.length; i < len; i += 4) {

            r = data[i];
            g = data[i + 1];
            b = data[i + 2];

            if (isImage) {
              tr = source[i] * this.alpha;
              tg = source[i + 1] * this.alpha;
              tb = source[i + 2] * this.alpha;
            }

            switch (this.mode) {
              case 'multiply':
                data[i] = r * tr / 255;
                data[i + 1] = g * tg / 255;
                data[i + 2] = b * tb / 255;
                break;
              case 'screen':
                data[i] = 1 - (1 - r) * (1 - tr);
                data[i + 1] = 1 - (1 - g) * (1 - tg);
                data[i + 2] = 1 - (1 - b) * (1 - tb);
                break;
              case 'add':
                data[i] = Math.min(255, r + tr);
                data[i + 1] = Math.min(255, g + tg);
                data[i + 2] = Math.min(255, b + tb);
                break;
              case 'diff':
              case 'difference':
                data[i] = Math.abs(r - tr);
                data[i + 1] = Math.abs(g - tg);
                data[i + 2] = Math.abs(b - tb);
                break;
              case 'subtract':
                _r = r - tr;
                _g = g - tg;
                _b = b - tb;

                data[i] = (_r < 0) ? 0 : _r;
                data[i + 1] = (_g < 0) ? 0 : _g;
                data[i + 2] = (_b < 0) ? 0 : _b;
                break;
              case 'darken':
                data[i] = Math.min(r, tr);
                data[i + 1] = Math.min(g, tg);
                data[i + 2] = Math.min(b, tb);
                break;
              case 'lighten':
                data[i] = Math.max(r, tr);
                data[i + 1] = Math.max(g, tg);
                data[i + 2] = Math.max(b, tb);
                break;
            }
          }

          context.putImageData(imageData, 0, 0);
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return {
            color: this.color,
            image: this.image,
            mode: this.mode,
            alpha: this.alpha
          };
        }
      });

      fabric.Image.filters.Blend.fromObject = function(object) {
        return new fabric.Image.filters.Blend(object);
      };
    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric  = global.fabric || (global.fabric = { }), pow = Math.pow, floor = Math.floor,
          sqrt = Math.sqrt, abs = Math.abs, max = Math.max, round = Math.round, sin = Math.sin,
          ceil = Math.ceil;

      /**
       * Resize image filter class
       * @class fabric.Image.filters.Resize
       * @memberOf fabric.Image.filters
       * @extends fabric.Image.filters.BaseFilter
       * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}
       * @example
       * var filter = new fabric.Image.filters.Resize();
       * object.filters.push(filter);
       * object.applyFilters(canvas.renderAll.bind(canvas));
       */
      fabric.Image.filters.Resize = fabric.util.createClass(fabric.Image.filters.BaseFilter, /** @lends fabric.Image.filters.Resize.prototype */ {

        /**
         * Filter type
         * @param {String} type
         * @default
         */
        type: 'Resize',

        /**
         * Resize type
         * @param {String} resizeType
         * @default
         */
        resizeType: 'hermite',

        /**
         * Scale factor for resizing, x axis
         * @param {Number} scaleX
         * @default
         */
        scaleX: 0,

        /**
         * Scale factor for resizing, y axis
         * @param {Number} scaleY
         * @default
         */
        scaleY: 0,

        /**
         * LanczosLobes parameter for lanczos filter
         * @param {Number} lanczosLobes
         * @default
         */
        lanczosLobes: 3,

        /**
         * Applies filter to canvas element
         * @memberOf fabric.Image.filters.Resize.prototype
         * @param {Object} canvasEl Canvas element to apply filter to
         */
        applyTo: function(canvasEl, scaleX, scaleY) {

          this.rcpScaleX = 1 / scaleX;
          this.rcpScaleY = 1 / scaleY;

          var oW = canvasEl.width, oH = canvasEl.height,
              dW = round(oW * scaleX), dH = round(oH * scaleY),
              imageData;

          Iif (this.resizeType === 'sliceHack') {
            imageData = this.sliceByTwo(canvasEl, oW, oH, dW, dH);
          }
          Iif (this.resizeType === 'hermite') {
            imageData = this.hermiteFastResize(canvasEl, oW, oH, dW, dH);
          }
          Eif (this.resizeType === 'bilinear') {
            imageData = this.bilinearFiltering(canvasEl, oW, oH, dW, dH);
          }
          Iif (this.resizeType === 'lanczos') {
            imageData = this.lanczosResize(canvasEl, oW, oH, dW, dH);
          }
          canvasEl.width = dW;
          canvasEl.height = dH;
          canvasEl.getContext('2d').putImageData(imageData, 0, 0);
        },

        sliceByTwo: function(canvasEl, width, height, newWidth, newHeight) {
          var context = canvasEl.getContext('2d'), imageData,
              multW = 0.5, multH = 0.5, signW = 1, signH = 1,
              doneW = false, doneH = false, stepW = width, stepH = height,
              tmpCanvas = fabric.util.createCanvasElement(),
              tmpCtx = tmpCanvas.getContext('2d');
          newWidth = floor(newWidth);
          newHeight = floor(newHeight);
          tmpCanvas.width = max(newWidth, width);
          tmpCanvas.height = max(newHeight, height);

          if (newWidth > width) {
            multW = 2;
            signW = -1;
          }
          if (newHeight > height) {
            multH = 2;
            signH = -1;
          }
          imageData = context.getImageData(0, 0, width, height);
          canvasEl.width = max(newWidth, width);
          canvasEl.height = max(newHeight, height);
          context.putImageData(imageData, 0, 0);

          while (!doneW || !doneH) {
            width = stepW;
            height = stepH;
            if (newWidth * signW < floor(stepW * multW * signW)) {
              stepW = floor(stepW * multW);
            }
            else {
              stepW = newWidth;
              doneW = true;
            }
            if (newHeight * signH < floor(stepH * multH * signH)) {
              stepH = floor(stepH * multH);
            }
            else {
              stepH = newHeight;
              doneH = true;
            }
            imageData = context.getImageData(0, 0, width, height);
            tmpCtx.putImageData(imageData, 0, 0);
            context.clearRect(0, 0, stepW, stepH);
            context.drawImage(tmpCanvas, 0, 0, width, height, 0, 0, stepW, stepH);
          }
          return context.getImageData(0, 0, newWidth, newHeight);
        },

        lanczosResize: function(canvasEl, oW, oH, dW, dH) {

          function lanczosCreate(lobes) {
            return function(x) {
              if (x > lobes) {
                return 0;
              }
              x *= Math.PI;
              if (abs(x) < 1e-16) {
                return 1;
              }
              var xx = x / lobes;
              return sin(x) * sin(xx) / x / xx;
            };
          }

          function process(u) {
            var v, i, weight, idx, a, red, green,
                blue, alpha, fX, fY;
            center.x = (u + 0.5) * ratioX;
            icenter.x = floor(center.x);
            for (v = 0; v < dH; v++) {
              center.y = (v + 0.5) * ratioY;
              icenter.y = floor(center.y);
              a = 0, red = 0, green = 0, blue = 0, alpha = 0;
              for (i = icenter.x - range2X; i <= icenter.x + range2X; i++) {
                if (i < 0 || i >= oW) {
                  continue;
                }
                fX = floor(1000 * abs(i - center.x));
                if (!cacheLanc[fX]) {
                  cacheLanc[fX] = { };
                }
                for (var j = icenter.y - range2Y; j <= icenter.y + range2Y; j++) {
                  if (j < 0 || j >= oH) {
                    continue;
                  }
                  fY = floor(1000 * abs(j - center.y));
                  if (!cacheLanc[fX][fY]) {
                    cacheLanc[fX][fY] = lanczos(sqrt(pow(fX * rcpRatioX, 2) + pow(fY * rcpRatioY, 2)) / 1000);
                  }
                  weight = cacheLanc[fX][fY];
                  if (weight > 0) {
                    idx = (j * oW + i) * 4;
                    a += weight;
                    red += weight * srcData[idx];
                    green += weight * srcData[idx + 1];
                    blue += weight * srcData[idx + 2];
                    alpha += weight * srcData[idx + 3];
                  }
                }
              }
              idx = (v * dW + u) * 4;
              destData[idx] = red / a;
              destData[idx + 1] = green / a;
              destData[idx + 2] = blue / a;
              destData[idx + 3] = alpha / a;
            }

            if (++u < dW) {
              return process(u);
            }
            else {
              return destImg;
            }
          }

          var context = canvasEl.getContext('2d'),
              srcImg = context.getImageData(0, 0, oW, oH),
              destImg = context.getImageData(0, 0, dW, dH),
              srcData = srcImg.data, destData = destImg.data,
              lanczos = lanczosCreate(this.lanczosLobes),
              ratioX = this.rcpScaleX, ratioY = this.rcpScaleY,
              rcpRatioX = 2 / this.rcpScaleX, rcpRatioY = 2 / this.rcpScaleY,
              range2X = ceil(ratioX * this.lanczosLobes / 2),
              range2Y = ceil(ratioY * this.lanczosLobes / 2),
              cacheLanc = { }, center = { }, icenter = { };

          return process(0);
        },

        bilinearFiltering: function(canvasEl, w, h, w2, h2) {
          var a, b, c, d, x, y, i, j, xDiff, yDiff, chnl,
              color, offset = 0, origPix, ratioX = this.rcpScaleX,
              ratioY = this.rcpScaleY, context = canvasEl.getContext('2d'),
              w4 = 4 * (w - 1), img = context.getImageData(0, 0, w, h),
              pixels = img.data, destImage = context.getImageData(0, 0, w2, h2),
              destPixels = destImage.data;
          for (i = 0; i < h2; i++) {
            for (j = 0; j < w2; j++) {
              x = floor(ratioX * j);
              y = floor(ratioY * i);
              xDiff = ratioX * j - x;
              yDiff = ratioY * i - y;
              origPix = 4 * (y * w + x);

              for (chnl = 0; chnl < 4; chnl++) {
                a = pixels[origPix + chnl];
                b = pixels[origPix + 4 + chnl];
                c = pixels[origPix + w4 + chnl];
                d = pixels[origPix + w4 + 4 + chnl];
                color = a * (1 - xDiff) * (1 - yDiff) + b * xDiff * (1 - yDiff) +
                        c * yDiff * (1 - xDiff) + d * xDiff * yDiff;
                destPixels[offset++] = color;
              }
            }
          }
          return destImage;
        },

        hermiteFastResize: function(canvasEl, oW, oH, dW, dH) {
          var ratioW = this.rcpScaleX, ratioH = this.rcpScaleY,
              ratioWHalf = ceil(ratioW / 2),
              ratioHHalf = ceil(ratioH / 2),
              context = canvasEl.getContext('2d'),
              img = context.getImageData(0, 0, oW, oH), data = img.data,
              img2 = context.getImageData(0, 0, dW, dH), data2 = img2.data;
          for (var j = 0; j < dH; j++) {
            for (var i = 0; i < dW; i++) {
              var x2 = (i + j * dW) * 4, weight = 0, weights = 0, weightsAlpha = 0,
                  gxR = 0, gxG = 0, gxB = 0, gxA = 0, centerY = (j + 0.5) * ratioH;
              for (var yy = floor(j * ratioH); yy < (j + 1) * ratioH; yy++) {
                var dy = abs(centerY - (yy + 0.5)) / ratioHHalf,
                    centerX = (i + 0.5) * ratioW, w0 = dy * dy;
                for (var xx = floor(i * ratioW); xx < (i + 1) * ratioW; xx++) {
                  var dx = abs(centerX - (xx + 0.5)) / ratioWHalf,
                      w = sqrt(w0 + dx * dx);
                  /*jshint maxdepth:5 */
                  if (w > 1 && w < -1) {
                    continue;
                  }
                  //hermite filter
                  weight = 2 * w * w * w - 3 * w * w + 1;
                  if (weight > 0) {
                    dx = 4 * (xx + yy * oW);
                    //alpha
                    gxA += weight * data[dx + 3];
                    weightsAlpha += weight;
                    //colors
                    /*jshint maxdepth:6 */
                    if (data[dx + 3] < 255) {
                      weight = weight * data[dx + 3] / 250;
                    }
                    /*jshint maxdepth:5 */
                    gxR += weight * data[dx];
                    gxG += weight * data[dx + 1];
                    gxB += weight * data[dx + 2];
                    weights += weight;
                  }
                  /*jshint maxdepth:4 */
                }
              }
              data2[x2] = gxR / weights;
              data2[x2 + 1] = gxG / weights;
              data2[x2 + 2] = gxB / weights;
              data2[x2 + 3] = gxA / weightsAlpha;
            }
          }
          return img2;
        },

        /**
         * Returns object representation of an instance
         * @return {Object} Object representation of an instance
         */
        toObject: function() {
          return {
            type: this.type,
            scaleX: this.scaleX,
            scaleY: this.scaleY,
            resizeType: this.resizeType,
            lanczosLobes: this.lanczosLobes
          };
        }
      });

      /**
       * Returns filter instance from an object representation
       * @static
       * @return {fabric.Image.filters.Resize} Instance of fabric.Image.filters.Resize
       */
      fabric.Image.filters.Resize.fromObject = function(object) {
        return new fabric.Image.filters.Resize(object);
      };

    })(typeof exports !== 'undefined' ? exports : this);

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = { }),
          extend = fabric.util.object.extend,
          clone = fabric.util.object.clone,
          toFixed = fabric.util.toFixed,
          supportsLineDash = fabric.StaticCanvas.supports('setLineDash'),
          NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;

      Iif (fabric.Text) {
        fabric.warn('fabric.Text is already defined');
        return;
      }

      var stateProperties = fabric.Object.prototype.stateProperties.concat();
      stateProperties.push(
        'fontFamily',
        'fontWeight',
        'fontSize',
        'text',
        'textDecoration',
        'textAlign',
        'fontStyle',
        'lineHeight',
        'textBackgroundColor'
      );

      /**
       * Text class
       * @class fabric.Text
       * @extends fabric.Object
       * @return {fabric.Text} thisArg
       * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#text}
       * @see {@link fabric.Text#initialize} for constructor definition
       */
      fabric.Text = fabric.util.createClass(fabric.Object, /** @lends fabric.Text.prototype */ {

        /**
         * Properties which when set cause object to change dimensions
         * @type Object
         * @private
         */
        _dimensionAffectingProps: {
          fontSize: true,
          fontWeight: true,
          fontFamily: true,
          fontStyle: true,
          lineHeight: true,
          stroke: true,
          strokeWidth: true,
          text: true,
          textAlign: true
        },

        /**
         * @private
         */
        _reNewline: /\r?\n/,

        /**
         * Use this regular expression to filter for whitespace that is not a new line.
         * Mostly used when text is 'justify' aligned.
         * @private
         */
        _reSpacesAndTabs: /[ \t\r]+/g,

        /**
         * Retrieves object's fontSize
         * @method getFontSize
         * @memberOf fabric.Text.prototype
         * @return {String} Font size (in pixels)
         */

        /**
         * Sets object's fontSize
         * Does not update the object .width and .height,
         * call ._initDimensions() to update the values.
         * @method setFontSize
         * @memberOf fabric.Text.prototype
         * @param {Number} fontSize Font size (in pixels)
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's fontWeight
         * @method getFontWeight
         * @memberOf fabric.Text.prototype
         * @return {(String|Number)} Font weight
         */

        /**
         * Sets object's fontWeight
         * Does not update the object .width and .height,
         * call ._initDimensions() to update the values.
         * @method setFontWeight
         * @memberOf fabric.Text.prototype
         * @param {(Number|String)} fontWeight Font weight
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's fontFamily
         * @method getFontFamily
         * @memberOf fabric.Text.prototype
         * @return {String} Font family
         */

        /**
         * Sets object's fontFamily
         * Does not update the object .width and .height,
         * call ._initDimensions() to update the values.
         * @method setFontFamily
         * @memberOf fabric.Text.prototype
         * @param {String} fontFamily Font family
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's text
         * @method getText
         * @memberOf fabric.Text.prototype
         * @return {String} text
         */

        /**
         * Sets object's text
         * Does not update the object .width and .height,
         * call ._initDimensions() to update the values.
         * @method setText
         * @memberOf fabric.Text.prototype
         * @param {String} text Text
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's textDecoration
         * @method getTextDecoration
         * @memberOf fabric.Text.prototype
         * @return {String} Text decoration
         */

        /**
         * Sets object's textDecoration
         * @method setTextDecoration
         * @memberOf fabric.Text.prototype
         * @param {String} textDecoration Text decoration
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's fontStyle
         * @method getFontStyle
         * @memberOf fabric.Text.prototype
         * @return {String} Font style
         */

        /**
         * Sets object's fontStyle
         * Does not update the object .width and .height,
         * call ._initDimensions() to update the values.
         * @method setFontStyle
         * @memberOf fabric.Text.prototype
         * @param {String} fontStyle Font style
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's lineHeight
         * @method getLineHeight
         * @memberOf fabric.Text.prototype
         * @return {Number} Line height
         */

        /**
         * Sets object's lineHeight
         * @method setLineHeight
         * @memberOf fabric.Text.prototype
         * @param {Number} lineHeight Line height
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's textAlign
         * @method getTextAlign
         * @memberOf fabric.Text.prototype
         * @return {String} Text alignment
         */

        /**
         * Sets object's textAlign
         * @method setTextAlign
         * @memberOf fabric.Text.prototype
         * @param {String} textAlign Text alignment
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Retrieves object's textBackgroundColor
         * @method getTextBackgroundColor
         * @memberOf fabric.Text.prototype
         * @return {String} Text background color
         */

        /**
         * Sets object's textBackgroundColor
         * @method setTextBackgroundColor
         * @memberOf fabric.Text.prototype
         * @param {String} textBackgroundColor Text background color
         * @return {fabric.Text}
         * @chainable
         */

        /**
         * Type of an object
         * @type String
         * @default
         */
        type:                 'text',

        /**
         * Font size (in pixels)
         * @type Number
         * @default
         */
        fontSize:             40,

        /**
         * Font weight (e.g. bold, normal, 400, 600, 800)
         * @type {(Number|String)}
         * @default
         */
        fontWeight:           'normal',

        /**
         * Font family
         * @type String
         * @default
         */
        fontFamily:           'Times New Roman',

        /**
         * Text decoration Possible values: "", "underline", "overline" or "line-through".
         * @type String
         * @default
         */
        textDecoration:       '',

        /**
         * Text alignment. Possible values: "left", "center", "right" or "justify".
         * @type String
         * @default
         */
        textAlign:            'left',

        /**
         * Font style . Possible values: "", "normal", "italic" or "oblique".
         * @type String
         * @default
         */
        fontStyle:            '',

        /**
         * Line height
         * @type Number
         * @default
         */
        lineHeight:           1.16,

        /**
         * Background color of text lines
         * @type String
         * @default
         */
        textBackgroundColor:  '',

        /**
         * List of properties to consider when checking if
         * state of an object is changed ({@link fabric.Object#hasStateChanged})
         * as well as for history (undo/redo) purposes
         * @type Array
         */
        stateProperties:      stateProperties,

        /**
         * When defined, an object is rendered via stroke and this property specifies its color.
         * <b>Backwards incompatibility note:</b> This property was named "strokeStyle" until v1.1.6
         * @type String
         * @default
         */
        stroke:               null,

        /**
         * Shadow object representing shadow of this shape.
         * <b>Backwards incompatibility note:</b> This property was named "textShadow" (String) until v1.2.11
         * @type fabric.Shadow
         * @default
         */
        shadow:               null,

        /**
         * @private
         */
        _fontSizeFraction: 0.25,

        /**
         * Text Line proportion to font Size (in pixels)
         * @type Number
         * @default
         */
        _fontSizeMult:             1.13,

        /**
         * Constructor
         * @param {String} text Text string
         * @param {Object} [options] Options object
         * @return {fabric.Text} thisArg
         */
        initialize: function(text, options) {
          options = options || { };
          this.text = text;
          this.__skipDimension = true;
          this.setOptions(options);
          this.__skipDimension = false;
          this._initDimensions();
        },

        /**
         * Initialize text dimensions. Render all text on given context
         * or on a offscreen canvas to get the text width with measureText.
         * Updates this.width and this.height with the proper values.
         * Does not return dimensions.
         * @param {CanvasRenderingContext2D} [ctx] Context to render on
         * @private
         */
        _initDimensions: function(ctx) {
          if (this.__skipDimension) {
            return;
          }
          if (!ctx) {
            ctx = fabric.util.createCanvasElement().getContext('2d');
            this._setTextStyles(ctx);
          }
          this._textLines = this._splitTextIntoLines();
          this._clearCache();
          this.width = this._getTextWidth(ctx);
          this.height = this._getTextHeight(ctx);
        },

        /**
         * Returns string representation of an instance
         * @return {String} String representation of text object
         */
        toString: function() {
          return '#<fabric.Text (' + this.complexity() +
            '): { "text": "' + this.text + '", "fontFamily": "' + this.fontFamily + '" }>';
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx) {
          this.clipTo && fabric.util.clipContext(this, ctx);
          this._setOpacity(ctx);
          this._setShadow(ctx);
          this._setupCompositeOperation(ctx);
          this._renderTextBackground(ctx);
          this._setStrokeStyles(ctx);
          this._setFillStyles(ctx);
          this._renderText(ctx);
          this._renderTextDecoration(ctx);
          this.clipTo && ctx.restore();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderText: function(ctx) {

          this._translateForTextAlign(ctx);
          this._renderTextFill(ctx);
          this._renderTextStroke(ctx);
          this._translateForTextAlign(ctx, true);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Boolean} back Indicates if translate back or forward
         */
        _translateForTextAlign: function(ctx, back) {
          if (this.textAlign !== 'left' && this.textAlign !== 'justify') {
            var sign = back ? -1 : 1;
            ctx.translate(this.textAlign === 'center' ? (sign * this.width / 2) : sign * this.width, 0);
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _setTextStyles: function(ctx) {
          ctx.textBaseline = 'alphabetic';
          Eif (!this.skipTextAlign) {
            ctx.textAlign = this.textAlign;
          }
          ctx.font = this._getFontDeclaration();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @return {Number} Height of fabric.Text object
         */
        _getTextHeight: function() {
          return this._textLines.length * this._getHeightOfLine();
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @return {Number} Maximum width of fabric.Text object
         */
        _getTextWidth: function(ctx) {
          var maxWidth = this._getLineWidth(ctx, 0);

          for (var i = 1, len = this._textLines.length; i < len; i++) {
            var currentLineWidth = this._getLineWidth(ctx, i);
            if (currentLineWidth > maxWidth) {
              maxWidth = currentLineWidth;
            }
          }
          return maxWidth;
        },

        /**
         * @private
         * @param {String} method Method name ("fillText" or "strokeText")
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {String} chars Chars to render
         * @param {Number} left Left position of text
         * @param {Number} top Top position of text
         */
        _renderChars: function(method, ctx, chars, left, top) {
          // remove Text word from method var
          var shortM = method.slice(0, -4);
          Iif (this[shortM].toLive) {
            var offsetX = -this.width / 2 + this[shortM].offsetX || 0,
                offsetY = -this.height / 2 + this[shortM].offsetY || 0;
            ctx.save();
            ctx.translate(offsetX, offsetY);
            left -= offsetX;
            top -= offsetY;
          }
          ctx[method](chars, left, top);
          this[shortM].toLive && ctx.restore();
        },

        /**
         * @private
         * @param {String} method Method name ("fillText" or "strokeText")
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {String} line Text to render
         * @param {Number} left Left position of text
         * @param {Number} top Top position of text
         * @param {Number} lineIndex Index of a line in a text
         */
        _renderTextLine: function(method, ctx, line, left, top, lineIndex) {
          // lift the line by quarter of fontSize
          top -= this.fontSize * this._fontSizeFraction;

          // short-circuit
          var lineWidth = this._getLineWidth(ctx, lineIndex);
          Eif (this.textAlign !== 'justify' || this.width < lineWidth) {
            this._renderChars(method, ctx, line, left, top, lineIndex);
            return;
          }

          // stretch the line
          var words = line.split(/\s+/),
              charOffset = 0,
              wordsWidth = this._getWidthOfWords(ctx, line, lineIndex, 0),
              widthDiff = this.width - wordsWidth,
              numSpaces = words.length - 1,
              spaceWidth = numSpaces > 0 ? widthDiff / numSpaces : 0,
              leftOffset = 0, word;

          for (var i = 0, len = words.length; i < len; i++) {
            while (line[charOffset] === ' ' && charOffset < line.length) {
              charOffset++;
            }
            word = words[i];
            this._renderChars(method, ctx, word, left + leftOffset, top, lineIndex, charOffset);
            leftOffset += this._getWidthOfWords(ctx, word, lineIndex, charOffset) + spaceWidth;
            charOffset += word.length;
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} line
         */
        _getWidthOfWords: function (ctx, line) {
          return ctx.measureText(line.replace(/\s+/g, '')).width;
        },

        /**
         * @private
         * @return {Number} Left offset
         */
        _getLeftOffset: function() {
          return -this.width / 2;
        },

        /**
         * @private
         * @return {Number} Top offset
         */
        _getTopOffset: function() {
          return -this.height / 2;
        },

        /**
         * Returns true because text has no style
         */
        isEmptyStyles: function() {
          return true;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextFill: function(ctx) {
          Iif (!this.fill && this.isEmptyStyles()) {
            return;
          }

          var lineHeights = 0;

          for (var i = 0, len = this._textLines.length; i < len; i++) {
            var heightOfLine = this._getHeightOfLine(ctx, i),
                maxHeight = heightOfLine / this.lineHeight;

            this._renderTextLine(
              'fillText',
              ctx,
              this._textLines[i],
              this._getLeftOffset(),
              this._getTopOffset() + lineHeights + maxHeight,
              i
            );
            lineHeights += heightOfLine;
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextStroke: function(ctx) {
          if ((!this.stroke || this.strokeWidth === 0) && this.isEmptyStyles()) {
            return;
          }

          var lineHeights = 0;

          Iif (this.shadow && !this.shadow.affectStroke) {
            this._removeShadow(ctx);
          }

          ctx.save();

          Iif (this.strokeDashArray) {
            // Spec requires the concatenation of two copies the dash list when the number of elements is odd
            if (1 & this.strokeDashArray.length) {
              this.strokeDashArray.push.apply(this.strokeDashArray, this.strokeDashArray);
            }
            supportsLineDash && ctx.setLineDash(this.strokeDashArray);
          }

          ctx.beginPath();
          for (var i = 0, len = this._textLines.length; i < len; i++) {
            var heightOfLine = this._getHeightOfLine(ctx, i),
                maxHeight = heightOfLine / this.lineHeight;

            this._renderTextLine(
              'strokeText',
              ctx,
              this._textLines[i],
              this._getLeftOffset(),
              this._getTopOffset() + lineHeights + maxHeight,
              i
            );
            lineHeights += heightOfLine;
          }
          ctx.closePath();
          ctx.restore();
        },

        _getHeightOfLine: function() {
          return this.fontSize * this._fontSizeMult * this.lineHeight;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Array} textLines Array of all text lines
         */
        _renderTextBackground: function(ctx) {
          this._renderTextBoxBackground(ctx);
          this._renderTextLinesBackground(ctx);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextBoxBackground: function(ctx) {
          Eif (!this.backgroundColor) {
            return;
          }

          ctx.fillStyle = this.backgroundColor;

          ctx.fillRect(
            this._getLeftOffset(),
            this._getTopOffset(),
            this.width,
            this.height
          );
          // if there is background color no other shadows
          // should be casted
          this._removeShadow(ctx);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextLinesBackground: function(ctx) {
          Eif (!this.textBackgroundColor) {
            return;
          }
          var lineTopOffset = 0, heightOfLine,
              lineWidth, lineLeftOffset;

          ctx.fillStyle = this.textBackgroundColor;
          for (var i = 0, len = this._textLines.length; i < len; i++) {
            heightOfLine = this._getHeightOfLine(ctx, i);
            lineWidth = this._getLineWidth(ctx, i);
            if (lineWidth > 0) {
              lineLeftOffset = this._getLineLeftOffset(lineWidth);
              ctx.fillRect(
                this._getLeftOffset() + lineLeftOffset,
                this._getTopOffset() + lineTopOffset,
                lineWidth,
                heightOfLine / this.lineHeight
              );
            }
            lineTopOffset += heightOfLine;
          }
          // if there is text background color no
          // other shadows should be casted
          this._removeShadow(ctx);
        },

        /**
         * @private
         * @param {Number} lineWidth Width of text line
         * @return {Number} Line left offset
         */
        _getLineLeftOffset: function(lineWidth) {
          Iif (this.textAlign === 'center') {
            return (this.width - lineWidth) / 2;
          }
          Iif (this.textAlign === 'right') {
            return this.width - lineWidth;
          }
          return 0;
        },

        /**
         * @private
         */
        _clearCache: function() {
          this.__lineWidths = [ ];
          this.__lineHeights = [ ];
        },

        /**
         * @private
         */
        _shouldClearCache: function() {
          var shouldClear = false;
          Iif (this._forceClearCache) {
            this._forceClearCache = false;
            return true;
          }
          for (var prop in this._dimensionAffectingProps) {
            if (this['__' + prop] !== this[prop]) {
              this['__' + prop] = this[prop];
              shouldClear = true;
            }
          }
          return shouldClear;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} lineIndex line number
         * @return {Number} Line width
         */
        _getLineWidth: function(ctx, lineIndex) {
          if (this.__lineWidths[lineIndex]) {
            return this.__lineWidths[lineIndex] === -1 ? this.width : this.__lineWidths[lineIndex];
          }

          var width, wordCount, line = this._textLines[lineIndex];

          if (line === '') {
            width = 0;
          }
          else {
            width = this._measureLine(ctx, lineIndex);
          }
          this.__lineWidths[lineIndex] = width;

          Iif (width && this.textAlign === 'justify') {
            wordCount = line.split(/\s+/);
            if (wordCount.length > 1) {
              this.__lineWidths[lineIndex] = -1;
            }
          }
          return width;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} lineIndex line number
         * @return {Number} Line width
         */
        _measureLine: function(ctx, lineIndex) {
          return ctx.measureText(this._textLines[lineIndex]).width;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextDecoration: function(ctx) {
          Eif (!this.textDecoration) {
            return;
          }

          var halfOfVerticalBox = this.height / 2,
              _this = this, offsets = [];

          /** @ignore */
          function renderLinesAtOffset(offsets) {
            var i, lineHeight = 0, len, j, oLen, lineWidth,
                lineLeftOffset, heightOfLine;

            for (i = 0, len = _this._textLines.length; i < len; i++) {

              lineWidth = _this._getLineWidth(ctx, i),
              lineLeftOffset = _this._getLineLeftOffset(lineWidth),
              heightOfLine = _this._getHeightOfLine(ctx, i);

              for (j = 0, oLen = offsets.length; j < oLen; j++) {
                ctx.fillRect(
                  _this._getLeftOffset() + lineLeftOffset,
                  lineHeight + (_this._fontSizeMult - 1 + offsets[j] ) * _this.fontSize - halfOfVerticalBox,
                  lineWidth,
                  _this.fontSize / 15);
              }
              lineHeight += heightOfLine;
            }
          }

          if (this.textDecoration.indexOf('underline') > -1) {
            offsets.push(0.85); // 1 - 3/16
          }
          if (this.textDecoration.indexOf('line-through') > -1) {
            offsets.push(0.43);
          }
          if (this.textDecoration.indexOf('overline') > -1) {
            offsets.push(-0.12);
          }
          if (offsets.length > 0) {
            renderLinesAtOffset(offsets);
          }
        },

        /**
         * @private
         */
        _getFontDeclaration: function() {
          return [
            // node-canvas needs "weight style", while browsers need "style weight"
            (fabric.isLikelyNode ? this.fontWeight : this.fontStyle),
            (fabric.isLikelyNode ? this.fontStyle : this.fontWeight),
            this.fontSize + 'px',
            (fabric.isLikelyNode ? ('"' + this.fontFamily + '"') : this.fontFamily)
          ].join(' ');
        },

        /**
         * Renders text instance on a specified context
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        render: function(ctx, noTransform) {
          // do not render if object is not visible
          Iif (!this.visible) {
            return;
          }

          ctx.save();
          this._setTextStyles(ctx);

          if (this._shouldClearCache()) {
            this._initDimensions(ctx);
          }
          this.drawSelectionBackground(ctx);
          Eif (!noTransform) {
            this.transform(ctx);
          }
          Iif (this.transformMatrix) {
            ctx.transform.apply(ctx, this.transformMatrix);
          }
          Iif (this.group && this.group.type === 'path-group') {
            ctx.translate(this.left, this.top);
          }
          this._render(ctx);
          ctx.restore();
        },

        /**
         * Returns the text as an array of lines.
         * @returns {Array} Lines in the text
         */
        _splitTextIntoLines: function() {
          return this.text.split(this._reNewline);
        },

        /**
         * Returns object representation of an instance
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} Object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var object = extend(this.callSuper('toObject', propertiesToInclude), {
            text:                 this.text,
            fontSize:             this.fontSize,
            fontWeight:           this.fontWeight,
            fontFamily:           this.fontFamily,
            fontStyle:            this.fontStyle,
            lineHeight:           this.lineHeight,
            textDecoration:       this.textDecoration,
            textAlign:            this.textAlign,
            textBackgroundColor:  this.textBackgroundColor
          });
          Iif (!this.includeDefaultValues) {
            this._removeDefaultValues(object);
          }
          return object;
        },

        /* _TO_SVG_START_ */
        /**
         * Returns SVG representation of an instance
         * @param {Function} [reviver] Method for further parsing of svg representation.
         * @return {String} svg representation of an instance
         */
        toSVG: function(reviver) {
          var markup = this._createBaseSVGMarkup(),
              offsets = this._getSVGLeftTopOffsets(this.ctx),
              textAndBg = this._getSVGTextAndBg(offsets.textTop, offsets.textLeft);
          this._wrapSVGTextAndBg(markup, textAndBg);

          return reviver ? reviver(markup.join('')) : markup.join('');
        },

        /**
         * @private
         */
        _getSVGLeftTopOffsets: function(ctx) {
          var lineTop = this._getHeightOfLine(ctx, 0),
              textLeft = -this.width / 2,
              textTop = 0;

          return {
            textLeft: textLeft + (this.group && this.group.type === 'path-group' ? this.left : 0),
            textTop: textTop + (this.group && this.group.type === 'path-group' ? -this.top : 0),
            lineTop: lineTop
          };
        },

        /**
         * @private
         */
        _wrapSVGTextAndBg: function(markup, textAndBg) {
          var noShadow = true, filter = this.getSvgFilter(),
              style = filter === '' ? '' : ' style="' + filter + '"';

          markup.push(
            '\t<g transform="', this.getSvgTransform(), this.getSvgTransformMatrix(), '"',
              style, '>\n',
              textAndBg.textBgRects.join(''),
              '\t\t<text ',
                (this.fontFamily ? 'font-family="' + this.fontFamily.replace(/"/g, '\'') + '" ': ''),
                (this.fontSize ? 'font-size="' + this.fontSize + '" ': ''),
                (this.fontStyle ? 'font-style="' + this.fontStyle + '" ': ''),
                (this.fontWeight ? 'font-weight="' + this.fontWeight + '" ': ''),
                (this.textDecoration ? 'text-decoration="' + this.textDecoration + '" ': ''),
                'style="', this.getSvgStyles(noShadow), '" >\n',
                textAndBg.textSpans.join(''),
              '\t\t</text>\n',
            '\t</g>\n'
          );
        },

        /**
         * @private
         * @param {Number} textTopOffset Text top offset
         * @param {Number} textLeftOffset Text left offset
         * @return {Object}
         */
        _getSVGTextAndBg: function(textTopOffset, textLeftOffset) {
          var textSpans = [ ],
              textBgRects = [ ],
              height = 0;
          // bounding-box background
          this._setSVGBg(textBgRects);

          // text and text-background
          for (var i = 0, len = this._textLines.length; i < len; i++) {
            Iif (this.textBackgroundColor) {
              this._setSVGTextLineBg(textBgRects, i, textLeftOffset, textTopOffset, height);
            }
            this._setSVGTextLineText(i, textSpans, height, textLeftOffset, textTopOffset, textBgRects);
            height += this._getHeightOfLine(this.ctx, i);
          }

          return {
            textSpans: textSpans,
            textBgRects: textBgRects
          };
        },

        _setSVGTextLineText: function(i, textSpans, height, textLeftOffset, textTopOffset) {
          var yPos = this.fontSize * (this._fontSizeMult - this._fontSizeFraction)
            - textTopOffset + height - this.height / 2;
          if (this.textAlign === 'justify') {
            // i call from here to do not intefere with IText
            this._setSVGTextLineJustifed(i, textSpans, yPos, textLeftOffset);
            return;
          }
          textSpans.push(
            '\t\t\t<tspan x="',
              toFixed(textLeftOffset + this._getLineLeftOffset(this._getLineWidth(this.ctx, i)), NUM_FRACTION_DIGITS), '" ',
              'y="',
              toFixed(yPos, NUM_FRACTION_DIGITS),
              '" ',
              // doing this on <tspan> elements since setting opacity
              // on containing <text> one doesn't work in Illustrator
              this._getFillAttributes(this.fill), '>',
              fabric.util.string.escapeXml(this._textLines[i]),
            '</tspan>\n'
          );
        },

        _setSVGTextLineJustifed: function(i, textSpans, yPos, textLeftOffset) {
          var ctx = fabric.util.createCanvasElement().getContext('2d');

          this._setTextStyles(ctx);

          var line = this._textLines[i],
              words = line.split(/\s+/),
              wordsWidth = this._getWidthOfWords(ctx, line),
              widthDiff = this.width - wordsWidth,
              numSpaces = words.length - 1,
              spaceWidth = numSpaces > 0 ? widthDiff / numSpaces : 0,
              word, attributes = this._getFillAttributes(this.fill),
              len;

          textLeftOffset += this._getLineLeftOffset(this._getLineWidth(ctx, i));

          for (i = 0, len = words.length; i < len; i++) {
            word = words[i];
            textSpans.push(
              '\t\t\t<tspan x="',
                toFixed(textLeftOffset, NUM_FRACTION_DIGITS), '" ',
                'y="',
                toFixed(yPos, NUM_FRACTION_DIGITS),
                '" ',
                // doing this on <tspan> elements since setting opacity
                // on containing <text> one doesn't work in Illustrator
                attributes, '>',
                fabric.util.string.escapeXml(word),
              '</tspan>\n'
            );
            textLeftOffset += this._getWidthOfWords(ctx, word) + spaceWidth;
          }
        },

        _setSVGTextLineBg: function(textBgRects, i, textLeftOffset, textTopOffset, height) {
          textBgRects.push(
            '\t\t<rect ',
              this._getFillAttributes(this.textBackgroundColor),
              ' x="',
              toFixed(textLeftOffset + this._getLineLeftOffset(this._getLineWidth(this.ctx, i)), NUM_FRACTION_DIGITS),
              '" y="',
              toFixed(height - this.height / 2, NUM_FRACTION_DIGITS),
              '" width="',
              toFixed(this._getLineWidth(this.ctx, i), NUM_FRACTION_DIGITS),
              '" height="',
              toFixed(this._getHeightOfLine(this.ctx, i) / this.lineHeight, NUM_FRACTION_DIGITS),
            '"></rect>\n');
        },

        _setSVGBg: function(textBgRects) {
          Iif (this.backgroundColor) {
            textBgRects.push(
              '\t\t<rect ',
                this._getFillAttributes(this.backgroundColor),
                ' x="',
                toFixed(-this.width / 2, NUM_FRACTION_DIGITS),
                '" y="',
                toFixed(-this.height / 2, NUM_FRACTION_DIGITS),
                '" width="',
                toFixed(this.width, NUM_FRACTION_DIGITS),
                '" height="',
                toFixed(this.height, NUM_FRACTION_DIGITS),
              '"></rect>\n');
          }
        },

        /**
         * Adobe Illustrator (at least CS5) is unable to render rgba()-based fill values
         * we work around it by "moving" alpha channel into opacity attribute and setting fill's alpha to 1
         *
         * @private
         * @param {Any} value
         * @return {String}
         */
        _getFillAttributes: function(value) {
          var fillColor = (value && typeof value === 'string') ? new fabric.Color(value) : '';
          Eif (!fillColor || !fillColor.getSource() || fillColor.getAlpha() === 1) {
            return 'fill="' + value + '"';
          }
          return 'opacity="' + fillColor.getAlpha() + '" fill="' + fillColor.setAlpha(1).toRgb() + '"';
        },
        /* _TO_SVG_END_ */

        /**
         * Sets specified property to a specified value
         * @param {String} key
         * @param {Any} value
         * @return {fabric.Text} thisArg
         * @chainable
         */
        _set: function(key, value) {
          this.callSuper('_set', key, value);

          if (key in this._dimensionAffectingProps) {
            this._initDimensions();
            this.setCoords();
          }
        },

        /**
         * Returns complexity of an instance
         * @return {Number} complexity
         */
        complexity: function() {
          return 1;
        }
      });

      /* _FROM_SVG_START_ */
      /**
       * List of attribute names to account for when parsing SVG element (used by {@link fabric.Text.fromElement})
       * @static
       * @memberOf fabric.Text
       * @see: http://www.w3.org/TR/SVG/text.html#TextElement
       */
      fabric.Text.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat(
        'x y dx dy font-family font-style font-weight font-size text-decoration text-anchor'.split(' '));

      /**
       * Default SVG font size
       * @static
       * @memberOf fabric.Text
       */
      fabric.Text.DEFAULT_SVG_FONT_SIZE = 16;

      /**
       * Returns fabric.Text instance from an SVG element (<b>not yet implemented</b>)
       * @static
       * @memberOf fabric.Text
       * @param {SVGElement} element Element to parse
       * @param {Object} [options] Options object
       * @return {fabric.Text} Instance of fabric.Text
       */
      fabric.Text.fromElement = function(element, options) {
        if (!element) {
          return null;
        }

        var parsedAttributes = fabric.parseAttributes(element, fabric.Text.ATTRIBUTE_NAMES);
        options = fabric.util.object.extend((options ? fabric.util.object.clone(options) : { }), parsedAttributes);

        options.top = options.top || 0;
        options.left = options.left || 0;
        Iif ('dx' in parsedAttributes) {
          options.left += parsedAttributes.dx;
        }
        Iif ('dy' in parsedAttributes) {
          options.top += parsedAttributes.dy;
        }
        if (!('fontSize' in options)) {
          options.fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;
        }

        if (!options.originX) {
          options.originX = 'left';
        }

        var textContent = '';

        // The XML is not properly parsed in IE9 so a workaround to get
        // textContent is through firstChild.data. Another workaround would be
        // to convert XML loaded from a file to be converted using DOMParser (same way loadSVGFromString() does)
        Iif (!('textContent' in element)) {
          if ('firstChild' in element && element.firstChild !== null) {
            if ('data' in element.firstChild && element.firstChild.data !== null) {
              textContent = element.firstChild.data;
            }
          }
        }
        else {
          textContent = element.textContent;
        }

        textContent = textContent.replace(/^\s+|\s+$|\n+/g, '').replace(/\s+/g, ' ');

        var text = new fabric.Text(textContent, options),
            /*
              Adjust positioning:
                x/y attributes in SVG correspond to the bottom-left corner of text bounding box
                top/left properties in Fabric correspond to center point of text bounding box
            */
            offX = 0;

        if (text.originX === 'left') {
          offX = text.getWidth() / 2;
        }
        Iif (text.originX === 'right') {
          offX = -text.getWidth() / 2;
        }
        text.set({
          left: text.getLeft() + offX,
          top: text.getTop() - text.getHeight() / 2 + text.fontSize * (0.18 + text._fontSizeFraction) /* 0.3 is the old lineHeight */
        });

        return text;
      };
      /* _FROM_SVG_END_ */

      /**
       * Returns fabric.Text instance from an object representation
       * @static
       * @memberOf fabric.Text
       * @param {Object} object Object to create an instance from
       * @return {fabric.Text} Instance of fabric.Text
       */
      fabric.Text.fromObject = function(object) {
        return new fabric.Text(object.text, clone(object));
      };

      fabric.util.createAccessors(fabric.Text);

    })(typeof exports !== 'undefined' ? exports : this);

    (function() {

      var clone = fabric.util.object.clone;

      /**
       * IText class (introduced in <b>v1.4</b>) Events are also fired with "text:"
       * prefix when observing canvas.
       * @class fabric.IText
       * @extends fabric.Text
       * @mixes fabric.Observable
       *
       * @fires changed
       * @fires selection:changed
       * @fires editing:entered
       * @fires editing:exited
       *
       * @return {fabric.IText} thisArg
       * @see {@link fabric.IText#initialize} for constructor definition
       *
       * <p>Supported key combinations:</p>
       * <pre>
       *   Move cursor:                    left, right, up, down
       *   Select character:               shift + left, shift + right
       *   Select text vertically:         shift + up, shift + down
       *   Move cursor by word:            alt + left, alt + right
       *   Select words:                   shift + alt + left, shift + alt + right
       *   Move cursor to line start/end:  cmd + left, cmd + right or home, end
       *   Select till start/end of line:  cmd + shift + left, cmd + shift + right or shift + home, shift + end
       *   Jump to start/end of text:      cmd + up, cmd + down
       *   Select till start/end of text:  cmd + shift + up, cmd + shift + down or shift + pgUp, shift + pgDown
       *   Delete character:               backspace
       *   Delete word:                    alt + backspace
       *   Delete line:                    cmd + backspace
       *   Forward delete:                 delete
       *   Copy text:                      ctrl/cmd + c
       *   Paste text:                     ctrl/cmd + v
       *   Cut text:                       ctrl/cmd + x
       *   Select entire text:             ctrl/cmd + a
       *   Quit editing                    tab or esc
       * </pre>
       *
       * <p>Supported mouse/touch combination</p>
       * <pre>
       *   Position cursor:                click/touch
       *   Create selection:               click/touch & drag
       *   Create selection:               click & shift + click
       *   Select word:                    double click
       *   Select line:                    triple click
       * </pre>
       */
      fabric.IText = fabric.util.createClass(fabric.Text, fabric.Observable, /** @lends fabric.IText.prototype */ {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'i-text',

        /**
         * Index where text selection starts (or where cursor is when there is no selection)
         * @type Number
         * @default
         */
        selectionStart: 0,

        /**
         * Index where text selection ends
         * @type Number
         * @default
         */
        selectionEnd: 0,

        /**
         * Color of text selection
         * @type String
         * @default
         */
        selectionColor: 'rgba(17,119,255,0.3)',

        /**
         * Indicates whether text is in editing mode
         * @type Boolean
         * @default
         */
        isEditing: false,

        /**
         * Indicates whether a text can be edited
         * @type Boolean
         * @default
         */
        editable: true,

        /**
         * Border color of text object while it's in editing mode
         * @type String
         * @default
         */
        editingBorderColor: 'rgba(102,153,255,0.25)',

        /**
         * Width of cursor (in px)
         * @type Number
         * @default
         */
        cursorWidth: 2,

        /**
         * Color of default cursor (when not overwritten by character style)
         * @type String
         * @default
         */
        cursorColor: '#333',

        /**
         * Delay between cursor blink (in ms)
         * @type Number
         * @default
         */
        cursorDelay: 1000,

        /**
         * Duration of cursor fadein (in ms)
         * @type Number
         * @default
         */
        cursorDuration: 600,

        /**
         * Object containing character styles
         * (where top-level properties corresponds to line number and 2nd-level properties -- to char number in a line)
         * @type Object
         * @default
         */
        styles: null,

        /**
         * Indicates whether internal text char widths can be cached
         * @type Boolean
         * @default
         */
        caching: true,

        /**
         * @private
         */
        _reSpace: /\s|\n/,

        /**
         * @private
         */
        _currentCursorOpacity: 0,

        /**
         * @private
         */
        _selectionDirection: null,

        /**
         * @private
         */
        _abortCursorAnimation: false,

        /**
         * @private
         */
        _charWidthsCache: { },

        /**
         * @private
         */
        __widthOfSpace: [ ],

        /**
         * Constructor
         * @param {String} text Text string
         * @param {Object} [options] Options object
         * @return {fabric.IText} thisArg
         */
        initialize: function(text, options) {
          this.styles = options ? (options.styles || { }) : { };
          this.callSuper('initialize', text, options);
          this.initBehavior();
        },

        /**
         * @private
         */
        _clearCache: function() {
          this.callSuper('_clearCache');
          this.__widthOfSpace = [ ];
        },

        /**
         * Returns true if object has no styling
         */
        isEmptyStyles: function() {
          Iif (!this.styles) {
            return true;
          }
          var obj = this.styles;

          for (var p1 in obj) {
            for (var p2 in obj[p1]) {
              /*jshint unused:false */
              for (var p3 in obj[p1][p2]) {
                return false;
              }
            }
          }
          return true;
        },

        /**
         * Sets selection start (left boundary of a selection)
         * @param {Number} index Index to set selection start to
         */
        setSelectionStart: function(index) {
          index = Math.max(index, 0);
          if (this.selectionStart !== index) {
            this.fire('selection:changed');
            this.canvas && this.canvas.fire('text:selection:changed', { target: this });
            this.selectionStart = index;
          }
          this._updateTextarea();
        },

        /**
         * Sets selection end (right boundary of a selection)
         * @param {Number} index Index to set selection end to
         */
        setSelectionEnd: function(index) {
          index = Math.min(index, this.text.length);
          Eif (this.selectionEnd !== index) {
            this.fire('selection:changed');
            this.canvas && this.canvas.fire('text:selection:changed', { target: this });
            this.selectionEnd = index;
          }
          this._updateTextarea();
        },

        /**
         * Gets style of a current selection/cursor (at the start position)
         * @param {Number} [startIndex] Start index to get styles at
         * @param {Number} [endIndex] End index to get styles at
         * @return {Object} styles Style object at a specified (or current) index
         */
        getSelectionStyles: function(startIndex, endIndex) {

          if (arguments.length === 2) {
            var styles = [ ];
            for (var i = startIndex; i < endIndex; i++) {
              styles.push(this.getSelectionStyles(i));
            }
            return styles;
          }

          var loc = this.get2DCursorLocation(startIndex),
              style = this._getStyleDeclaration(loc.lineIndex, loc.charIndex);

          return style || {};
        },

        /**
         * Sets style of a current selection
         * @param {Object} [styles] Styles object
         * @return {fabric.IText} thisArg
         * @chainable
         */
        setSelectionStyles: function(styles) {
          Eif (this.selectionStart === this.selectionEnd) {
            this._extendStyles(this.selectionStart, styles);
          }
          else {
            for (var i = this.selectionStart; i < this.selectionEnd; i++) {
              this._extendStyles(i, styles);
            }
          }
          /* not included in _extendStyles to avoid clearing cache more than once */
          this._forceClearCache = true;
          return this;
        },

        /**
         * @private
         */
        _extendStyles: function(index, styles) {
          var loc = this.get2DCursorLocation(index);

          Iif (!this._getLineStyle(loc.lineIndex)) {
            this._setLineStyle(loc.lineIndex, {});
          }

          Iif (!this._getStyleDeclaration(loc.lineIndex, loc.charIndex)) {
            this._setStyleDeclaration(loc.lineIndex, loc.charIndex, {});
          }

          fabric.util.object.extend(this._getStyleDeclaration(loc.lineIndex, loc.charIndex), styles);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _render: function(ctx) {
          this.callSuper('_render', ctx);
          this.ctx = ctx;
          this.isEditing && this.renderCursorOrSelection();
        },

        /**
         * Renders cursor or selection (depending on what exists)
         */
        renderCursorOrSelection: function() {
          if (!this.active) {
            return;
          }

          var chars = this.text.split(''),
              boundaries, ctx;

          if (this.canvas.contextTop) {
            ctx = this.canvas.contextTop;
            ctx.save();
            ctx.transform.apply(ctx, this.canvas.viewportTransform);
            this.transform(ctx);
            this.transformMatrix && ctx.transform.apply(ctx, this.transformMatrix);
          }
          else {
            ctx = this.ctx;
            ctx.save();
          }

          if (this.selectionStart === this.selectionEnd) {
            boundaries = this._getCursorBoundaries(chars, 'cursor');
            this.renderCursor(boundaries, ctx);
          }
          else {
            boundaries = this._getCursorBoundaries(chars, 'selection');
            this.renderSelection(chars, boundaries, ctx);
          }

          ctx.restore();
        },

        /**
         * Returns 2d representation (lineIndex and charIndex) of cursor (or selection start)
         * @param {Number} [selectionStart] Optional index. When not given, current selectionStart is used.
         */
        get2DCursorLocation: function(selectionStart) {
          if (typeof selectionStart === 'undefined') {
            selectionStart = this.selectionStart;
          }
          var len = this._textLines.length;
          for (var i = 0; i < len; i++) {
            if (selectionStart <= this._textLines[i].length) {
              return {
                lineIndex: i,
                charIndex: selectionStart
              };
            }
            selectionStart -= this._textLines[i].length + 1;
          }
          return {
            lineIndex: i - 1,
            charIndex: this._textLines[i - 1].length < selectionStart ? this._textLines[i - 1].length : selectionStart
          };
        },

        /**
         * Returns complete style of char at the current cursor
         * @param {Number} lineIndex Line index
         * @param {Number} charIndex Char index
         * @return {Object} Character style
         */
        getCurrentCharStyle: function(lineIndex, charIndex) {
          var style = this._getStyleDeclaration(lineIndex, charIndex === 0 ? 0 : charIndex - 1);

          return {
            fontSize: style && style.fontSize || this.fontSize,
            fill: style && style.fill || this.fill,
            textBackgroundColor: style && style.textBackgroundColor || this.textBackgroundColor,
            textDecoration: style && style.textDecoration || this.textDecoration,
            fontFamily: style && style.fontFamily || this.fontFamily,
            fontWeight: style && style.fontWeight || this.fontWeight,
            fontStyle: style && style.fontStyle || this.fontStyle,
            stroke: style && style.stroke || this.stroke,
            strokeWidth: style && style.strokeWidth || this.strokeWidth
          };
        },

        /**
         * Returns fontSize of char at the current cursor
         * @param {Number} lineIndex Line index
         * @param {Number} charIndex Char index
         * @return {Number} Character font size
         */
        getCurrentCharFontSize: function(lineIndex, charIndex) {
          var style = this._getStyleDeclaration(lineIndex, charIndex === 0 ? 0 : charIndex - 1);
          return style && style.fontSize ? style.fontSize : this.fontSize;
        },

        /**
         * Returns color (fill) of char at the current cursor
         * @param {Number} lineIndex Line index
         * @param {Number} charIndex Char index
         * @return {String} Character color (fill)
         */
        getCurrentCharColor: function(lineIndex, charIndex) {
          var style = this._getStyleDeclaration(lineIndex, charIndex === 0 ? 0 : charIndex - 1);
          return style && style.fill ? style.fill : this.cursorColor;
        },

        /**
         * Returns cursor boundaries (left, top, leftOffset, topOffset)
         * @private
         * @param {Array} chars Array of characters
         * @param {String} typeOfBoundaries
         */
        _getCursorBoundaries: function(chars, typeOfBoundaries) {

          // left/top are left/top of entire text box
          // leftOffset/topOffset are offset from that left/top point of a text box

          var left = Math.round(this._getLeftOffset()),
              top = this._getTopOffset(),

              offsets = this._getCursorBoundariesOffsets(
                          chars, typeOfBoundaries);

          return {
            left: left,
            top: top,
            leftOffset: offsets.left + offsets.lineLeft,
            topOffset: offsets.top
          };
        },

        /**
         * @private
         */
        _getCursorBoundariesOffsets: function(chars, typeOfBoundaries) {

          var lineLeftOffset = 0,

              lineIndex = 0,
              charIndex = 0,
              topOffset = 0,
              leftOffset = 0;

          for (var i = 0; i < this.selectionStart; i++) {
            if (chars[i] === '\n') {
              leftOffset = 0;
              topOffset += this._getHeightOfLine(this.ctx, lineIndex);

              lineIndex++;
              charIndex = 0;
            }
            else {
              leftOffset += this._getWidthOfChar(this.ctx, chars[i], lineIndex, charIndex);
              charIndex++;
            }

            lineLeftOffset = this._getLineLeftOffset(this._getLineWidth(this.ctx, lineIndex));
          }
          Eif (typeOfBoundaries === 'cursor') {
            topOffset += (1 - this._fontSizeFraction) * this._getHeightOfLine(this.ctx, lineIndex) / this.lineHeight
              - this.getCurrentCharFontSize(lineIndex, charIndex) * (1 - this._fontSizeFraction);
          }

          return {
            top: topOffset,
            left: leftOffset,
            lineLeft: lineLeftOffset
          };
        },

        /**
         * Renders cursor
         * @param {Object} boundaries
         * @param {CanvasRenderingContext2D} ctx transformed context to draw on
         */
        renderCursor: function(boundaries, ctx) {

          var cursorLocation = this.get2DCursorLocation(),
              lineIndex = cursorLocation.lineIndex,
              charIndex = cursorLocation.charIndex,
              charHeight = this.getCurrentCharFontSize(lineIndex, charIndex),
              leftOffset = (lineIndex === 0 && charIndex === 0)
                        ? this._getLineLeftOffset(this._getLineWidth(ctx, lineIndex))
                        : boundaries.leftOffset;

          ctx.fillStyle = this.getCurrentCharColor(lineIndex, charIndex);
          ctx.globalAlpha = this.__isMousedown ? 1 : this._currentCursorOpacity;

          ctx.fillRect(
            boundaries.left + leftOffset,
            boundaries.top + boundaries.topOffset,
            this.cursorWidth / this.scaleX,
            charHeight);

        },

        /**
         * Renders text selection
         * @param {Array} chars Array of characters
         * @param {Object} boundaries Object with left/top/leftOffset/topOffset
         * @param {CanvasRenderingContext2D} ctx transformed context to draw on
         */
        renderSelection: function(chars, boundaries, ctx) {

          ctx.fillStyle = this.selectionColor;

          var start = this.get2DCursorLocation(this.selectionStart),
              end = this.get2DCursorLocation(this.selectionEnd),
              startLine = start.lineIndex,
              endLine = end.lineIndex;

          for (var i = startLine; i <= endLine; i++) {
            var lineOffset = this._getLineLeftOffset(this._getLineWidth(ctx, i)) || 0,
                lineHeight = this._getHeightOfLine(this.ctx, i),
                boxWidth = 0, line = this._textLines[i];

            if (i === startLine) {
              for (var j = 0, len = line.length; j < len; j++) {
                if (j >= start.charIndex && (i !== endLine || j < end.charIndex)) {
                  boxWidth += this._getWidthOfChar(ctx, line[j], i, j);
                }
                if (j < start.charIndex) {
                  lineOffset += this._getWidthOfChar(ctx, line[j], i, j);
                }
              }
            }
            else if (i > startLine && i < endLine) {
              boxWidth += this._getLineWidth(ctx, i) || 5;
            }
            else if (i === endLine) {
              for (var j2 = 0, j2len = end.charIndex; j2 < j2len; j2++) {
                boxWidth += this._getWidthOfChar(ctx, line[j2], i, j2);
              }
            }

            ctx.fillRect(
              boundaries.left + lineOffset,
              boundaries.top + boundaries.topOffset,
              boxWidth,
              lineHeight);

            boundaries.topOffset += lineHeight;
          }
        },

        /**
         * @private
         * @param {String} method
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderChars: function(method, ctx, line, left, top, lineIndex, charOffset) {

          if (this.isEmptyStyles()) {
            return this._renderCharsFast(method, ctx, line, left, top);
          }

          charOffset = charOffset || 0;
          this.skipTextAlign = true;

          // set proper box offset
          left -= this.textAlign === 'center'
            ? (this.width / 2)
            : (this.textAlign === 'right')
              ? this.width
              : 0;

          // set proper line offset
          var lineHeight = this._getHeightOfLine(ctx, lineIndex),
              lineLeftOffset = this._getLineLeftOffset(this._getLineWidth(ctx, lineIndex)),
              prevStyle,
              thisStyle,
              charsToRender = '';

          left += lineLeftOffset || 0;

          ctx.save();
          top -= lineHeight / this.lineHeight * this._fontSizeFraction;
          for (var i = charOffset, len = line.length + charOffset; i <= len; i++) {
            prevStyle = prevStyle || this.getCurrentCharStyle(lineIndex, i);
            thisStyle = this.getCurrentCharStyle(lineIndex, i + 1);

            if (this._hasStyleChanged(prevStyle, thisStyle) || i === len) {
              this._renderChar(method, ctx, lineIndex, i - 1, charsToRender, left, top, lineHeight);
              charsToRender = '';
              prevStyle = thisStyle;
            }
            charsToRender += line[i - charOffset];
          }
          ctx.restore();
        },

        /**
         * @private
         * @param {String} method
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {String} line Content of the line
         * @param {Number} left Left coordinate
         * @param {Number} top Top coordinate
         */
        _renderCharsFast: function(method, ctx, line, left, top) {
          this.skipTextAlign = false;

          Eif (method === 'fillText' && this.fill) {
            this.callSuper('_renderChars', method, ctx, line, left, top);
          }
          Iif (method === 'strokeText' && ((this.stroke && this.strokeWidth > 0) || this.skipFillStrokeCheck)) {
            this.callSuper('_renderChars', method, ctx, line, left, top);
          }
        },

        /**
         * @private
         * @param {String} method
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} lineIndex
         * @param {Number} i
         * @param {String} _char
         * @param {Number} left Left coordinate
         * @param {Number} top Top coordinate
         * @param {Number} lineHeight Height of the line
         */
        _renderChar: function(method, ctx, lineIndex, i, _char, left, top, lineHeight) {
          var charWidth, charHeight, shouldFill, shouldStroke,
              decl = this._getStyleDeclaration(lineIndex, i),
              offset, textDecoration;

          if (decl) {
            charHeight = this._getHeightOfChar(ctx, _char, lineIndex, i);
            shouldStroke = decl.stroke;
            shouldFill = decl.fill;
            textDecoration = decl.textDecoration;
          }
          else {
            charHeight = this.fontSize;
          }

          shouldStroke = (shouldStroke || this.stroke) && method === 'strokeText';
          shouldFill = (shouldFill || this.fill) && method === 'fillText';

          decl && ctx.save();

          charWidth = this._applyCharStylesGetWidth(ctx, _char, lineIndex, i, decl || {});
          textDecoration = textDecoration || this.textDecoration;

          Iif (decl && decl.textBackgroundColor) {
            this._removeShadow(ctx);
          }
          shouldFill && ctx.fillText(_char, left, top);
          shouldStroke && ctx.strokeText(_char, left, top);

          Iif (textDecoration || textDecoration !== '') {
            offset = this._fontSizeFraction * lineHeight / this.lineHeight;
            this._renderCharDecoration(ctx, textDecoration, left, top, offset, charWidth, charHeight);
          }

          decl && ctx.restore();
          ctx.translate(charWidth, 0);
        },

        /**
         * @private
         * @param {Object} prevStyle
         * @param {Object} thisStyle
         */
        _hasStyleChanged: function(prevStyle, thisStyle) {
          return (prevStyle.fill !== thisStyle.fill ||
                  prevStyle.fontSize !== thisStyle.fontSize ||
                  prevStyle.textBackgroundColor !== thisStyle.textBackgroundColor ||
                  prevStyle.textDecoration !== thisStyle.textDecoration ||
                  prevStyle.fontFamily !== thisStyle.fontFamily ||
                  prevStyle.fontWeight !== thisStyle.fontWeight ||
                  prevStyle.fontStyle !== thisStyle.fontStyle ||
                  prevStyle.stroke !== thisStyle.stroke ||
                  prevStyle.strokeWidth !== thisStyle.strokeWidth
          );
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderCharDecoration: function(ctx, textDecoration, left, top, offset, charWidth, charHeight) {

          if (!textDecoration) {
            return;
          }

          var decorationWeight = charHeight / 15,
              positions = {
                underline: top + charHeight / 10,
                'line-through': top - charHeight * (this._fontSizeFraction + this._fontSizeMult - 1) + decorationWeight,
                overline: top - (this._fontSizeMult - this._fontSizeFraction) * charHeight
              },
              decorations = ['underline', 'line-through', 'overline'], i, decoration;

          for (i = 0; i < decorations.length; i++) {
            decoration = decorations[i];
            if (textDecoration.indexOf(decoration) > -1) {
              ctx.fillRect(left, positions[decoration], charWidth , decorationWeight);
            }
          }
        },

        /**
         * @private
         * @param {String} method
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {String} line
         */
        _renderTextLine: function(method, ctx, line, left, top, lineIndex) {
          // to "cancel" this.fontSize subtraction in fabric.Text#_renderTextLine
          // the adding 0.03 is just to align text with itext by overlap test
          if (!this.isEmptyStyles()) {
            top += this.fontSize * (this._fontSizeFraction + 0.03);
          }
          this.callSuper('_renderTextLine', method, ctx, line, left, top, lineIndex);
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextDecoration: function(ctx) {
          if (this.isEmptyStyles()) {
            return this.callSuper('_renderTextDecoration', ctx);
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _renderTextLinesBackground: function(ctx) {
          this.callSuper('_renderTextLinesBackground', ctx);

          var lineTopOffset = 0, heightOfLine,
              lineWidth, lineLeftOffset,
              leftOffset = this._getLeftOffset(),
              topOffset = this._getTopOffset(),
              line, _char, style;

          for (var i = 0, len = this._textLines.length; i < len; i++) {
            heightOfLine = this._getHeightOfLine(ctx, i);
            line = this._textLines[i];

            if (line === '' || !this.styles || !this._getLineStyle(i)) {
              lineTopOffset += heightOfLine;
              continue;
            }

            lineWidth = this._getLineWidth(ctx, i);
            lineLeftOffset = this._getLineLeftOffset(lineWidth);

            for (var j = 0, jlen = line.length; j < jlen; j++) {
              style = this._getStyleDeclaration(i, j);
              Eif (!style || !style.textBackgroundColor) {
                continue;
              }
              _char = line[j];

              ctx.fillStyle = style.textBackgroundColor;

              ctx.fillRect(
                leftOffset + lineLeftOffset + this._getWidthOfCharsAt(ctx, i, j),
                topOffset + lineTopOffset,
                this._getWidthOfChar(ctx, _char, i, j) + 1,
                heightOfLine / this.lineHeight
              );
            }
            lineTopOffset += heightOfLine;
          }
        },

        /**
         * @private
         */
        _getCacheProp: function(_char, styleDeclaration) {
          return _char +
                 styleDeclaration.fontFamily +
                 styleDeclaration.fontSize +
                 styleDeclaration.fontWeight +
                 styleDeclaration.fontStyle +
                 styleDeclaration.shadow;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {String} _char
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @param {Object} [decl]
         */
        _applyCharStylesGetWidth: function(ctx, _char, lineIndex, charIndex, decl) {
          var charDecl = this._getStyleDeclaration(lineIndex, charIndex),
              styleDeclaration = (decl && clone(decl)) || clone(charDecl), width;

          this._applyFontStyles(styleDeclaration);

          var cacheProp = this._getCacheProp(_char, styleDeclaration);

          // short-circuit if no styles for this char
          // global style from object is always applyed and handled by save and restore
          if (!charDecl && this._charWidthsCache[cacheProp] && this.caching) {
            return this._charWidthsCache[cacheProp];
          }

          Iif (typeof styleDeclaration.shadow === 'string') {
            styleDeclaration.shadow = new fabric.Shadow(styleDeclaration.shadow);
          }

          var fill = styleDeclaration.fill || this.fill;
          ctx.fillStyle = fill.toLive
            ? fill.toLive(ctx, this)
            : fill;

          if (styleDeclaration.stroke) {
            ctx.strokeStyle = (styleDeclaration.stroke && styleDeclaration.stroke.toLive)
              ? styleDeclaration.stroke.toLive(ctx, this)
              : styleDeclaration.stroke;
          }

          ctx.lineWidth = styleDeclaration.strokeWidth || this.strokeWidth;
          ctx.font = this._getFontDeclaration.call(styleDeclaration);

          //if we want this._setShadow.call to work with styleDeclarion
          //we have to add those references
          Iif (styleDeclaration.shadow) {
            styleDeclaration.scaleX = this.scaleX;
            styleDeclaration.scaleY = this.scaleY;
            styleDeclaration.canvas = this.canvas;
            this._setShadow.call(styleDeclaration, ctx);
          }

          if (!this.caching || !this._charWidthsCache[cacheProp]) {
            width = ctx.measureText(_char).width;
            this.caching && (this._charWidthsCache[cacheProp] = width);
            return width;
          }

          return this._charWidthsCache[cacheProp];
        },

        /**
         * @private
         * @param {Object} styleDeclaration
         */
        _applyFontStyles: function(styleDeclaration) {
          if (!styleDeclaration.fontFamily) {
            styleDeclaration.fontFamily = this.fontFamily;
          }
          if (!styleDeclaration.fontSize) {
            styleDeclaration.fontSize = this.fontSize;
          }
          Eif (!styleDeclaration.fontWeight) {
            styleDeclaration.fontWeight = this.fontWeight;
          }
          Eif (!styleDeclaration.fontStyle) {
            styleDeclaration.fontStyle = this.fontStyle;
          }
        },

        /**
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @param {Boolean} [returnCloneOrEmpty=false]
         * @private
         */
        _getStyleDeclaration: function(lineIndex, charIndex, returnCloneOrEmpty) {
          if (returnCloneOrEmpty) {
            return (this.styles[lineIndex] && this.styles[lineIndex][charIndex])
              ? clone(this.styles[lineIndex][charIndex])
              : { };
          }

          return this.styles[lineIndex] && this.styles[lineIndex][charIndex] ? this.styles[lineIndex][charIndex] : null;
        },

        /**
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @param {Object} style
         * @private
         */
        _setStyleDeclaration: function(lineIndex, charIndex, style) {
          this.styles[lineIndex][charIndex] = style;
        },

        /**
         *
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @private
         */
        _deleteStyleDeclaration: function(lineIndex, charIndex) {
          delete this.styles[lineIndex][charIndex];
        },

        /**
         * @param {Number} lineIndex
         * @private
         */
        _getLineStyle: function(lineIndex) {
          return this.styles[lineIndex];
        },

        /**
         * @param {Number} lineIndex
         * @param {Object} style
         * @private
         */
        _setLineStyle: function(lineIndex, style) {
          this.styles[lineIndex] = style;
        },

        /**
         * @param {Number} lineIndex
         * @private
         */
        _deleteLineStyle: function(lineIndex) {
          delete this.styles[lineIndex];
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _getWidthOfChar: function(ctx, _char, lineIndex, charIndex) {
          Iif (!this._isMeasuring && this.textAlign === 'justify' && this._reSpacesAndTabs.test(_char)) {
            return this._getWidthOfSpace(ctx, lineIndex);
          }

          var styleDeclaration = this._getStyleDeclaration(lineIndex, charIndex, true);
          this._applyFontStyles(styleDeclaration);
          var cacheProp = this._getCacheProp(_char, styleDeclaration);

          if (this._charWidthsCache[cacheProp] && this.caching) {
            return this._charWidthsCache[cacheProp];
          }
          else Eif (ctx) {
            ctx.save();
            var width = this._applyCharStylesGetWidth(ctx, _char, lineIndex, charIndex);
            ctx.restore();
            return width;
          }
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _getHeightOfChar: function(ctx, lineIndex, charIndex) {
          var style = this._getStyleDeclaration(lineIndex, charIndex);
          return style && style.fontSize ? style.fontSize : this.fontSize;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} lineIndex
         * @param {Number} charIndex
         */
        _getWidthOfCharsAt: function(ctx, lineIndex, charIndex) {
          var width = 0, i, _char;
          for (i = 0; i < charIndex; i++) {
            _char = this._textLines[lineIndex][i];
            width += this._getWidthOfChar(ctx, _char, lineIndex, i);
          }
          return width;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} lineIndex line number
         * @return {Number} Line width
         */
        _measureLine: function(ctx, lineIndex) {
          this._isMeasuring = true;
          var width = this._getWidthOfCharsAt(ctx, lineIndex, this._textLines[lineIndex].length);
          this._isMeasuring = false;
          return width;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} lineIndex
         */
        _getWidthOfSpace: function (ctx, lineIndex) {
          if (this.__widthOfSpace[lineIndex]) {
            return this.__widthOfSpace[lineIndex];
          }
          var line = this._textLines[lineIndex],
              wordsWidth = this._getWidthOfWords(ctx, line, lineIndex, 0),
              widthDiff = this.width - wordsWidth,
              numSpaces = line.length - line.replace(this._reSpacesAndTabs, '').length,
              width = Math.max(widthDiff / numSpaces, ctx.measureText(' ').width);
          this.__widthOfSpace[lineIndex] = width;
          return width;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         * @param {Number} line
         * @param {Number} lineIndex
         */
        _getWidthOfWords: function (ctx, line, lineIndex, charOffset) {
          var width = 0;

          for (var charIndex = 0; charIndex < line.length; charIndex++) {
            var _char = line[charIndex];

            if (!_char.match(/\s/)) {
              width += this._getWidthOfChar(ctx, _char, lineIndex, charIndex + charOffset);
            }
          }

          return width;
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _getHeightOfLine: function(ctx, lineIndex) {
          if (this.__lineHeights[lineIndex]) {
            return this.__lineHeights[lineIndex];
          }

          var line = this._textLines[lineIndex],
              maxHeight = this._getHeightOfChar(ctx, lineIndex, 0);

          for (var i = 1, len = line.length; i < len; i++) {
            var currentCharHeight = this._getHeightOfChar(ctx, lineIndex, i);
            if (currentCharHeight > maxHeight) {
              maxHeight = currentCharHeight;
            }
          }
          this.__lineHeights[lineIndex] = maxHeight * this.lineHeight * this._fontSizeMult;
          return this.__lineHeights[lineIndex];
        },

        /**
         * @private
         * @param {CanvasRenderingContext2D} ctx Context to render on
         */
        _getTextHeight: function(ctx) {
          var height = 0;
          for (var i = 0, len = this._textLines.length; i < len; i++) {
            height += this._getHeightOfLine(ctx, i);
          }
          return height;
        },

        /**
         * Returns object representation of an instance
         * @method toObject
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          var clonedStyles = { }, i, j, row;
          for (i in this.styles) {
            row = this.styles[i];
            clonedStyles[i] = { };
            for (j in row) {
              clonedStyles[i][j] = clone(row[j]);
            }
          }
          return fabric.util.object.extend(this.callSuper('toObject', propertiesToInclude), {
            styles: clonedStyles
          });
        }
      });

      /**
       * Returns fabric.IText instance from an object representation
       * @static
       * @memberOf fabric.IText
       * @param {Object} object Object to create an instance from
       * @return {fabric.IText} instance of fabric.IText
       */
      fabric.IText.fromObject = function(object) {
        return new fabric.IText(object.text, clone(object));
      };
    })();

    (function() {

      var clone = fabric.util.object.clone;

      fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {

        /**
         * Initializes all the interactive behavior of IText
         */
        initBehavior: function() {
          this.initAddedHandler();
          this.initRemovedHandler();
          this.initCursorSelectionHandlers();
          this.initDoubleClickSimulation();
        },

        /**
         * Initializes "selected" event handler
         */
        initSelectedHandler: function() {
          this.on('selected', function() {

            var _this = this;
            setTimeout(function() {
              _this.selected = true;
            }, 100);
          });
        },

        /**
         * Initializes "added" event handler
         */
        initAddedHandler: function() {
          var _this = this;
          this.on('added', function() {
            if (this.canvas && !this.canvas._hasITextHandlers) {
              this.canvas._hasITextHandlers = true;
              this._initCanvasHandlers();
            }

            // Track IText instances per-canvas. Only register in this array once added
            // to a canvas; we don't want to leak a reference to the instance forever
            // simply because it existed at some point.
            // (Might be added to a collection, but not on a canvas.)
            Eif (_this.canvas) {
              _this.canvas._iTextInstances = _this.canvas._iTextInstances || [];
              _this.canvas._iTextInstances.push(_this);
            }
          });
        },

        initRemovedHandler: function() {
          var _this = this;
          this.on('removed', function() {
            // (Might be removed from a collection, but not on a canvas.)
            Eif (_this.canvas) {
              _this.canvas._iTextInstances = _this.canvas._iTextInstances || [];
              fabric.util.removeFromArray(_this.canvas._iTextInstances, _this);
            }
          });
        },

        /**
         * @private
         */
        _initCanvasHandlers: function() {
          var _this = this;

          this.canvas.on('selection:cleared', function() {
            fabric.IText.prototype.exitEditingOnOthers(_this.canvas);
          });

          this.canvas.on('mouse:up', function() {
            if (_this.canvas._iTextInstances) {
              _this.canvas._iTextInstances.forEach(function(obj) {
                obj.__isMousedown = false;
              });
            }
          });

          this.canvas.on('object:selected', function() {
            fabric.IText.prototype.exitEditingOnOthers(_this.canvas);
          });
        },

        /**
         * @private
         */
        _tick: function() {
          this._currentTickState = this._animateCursor(this, 1, this.cursorDuration, '_onTickComplete');
        },

        /**
         * @private
         */
        _animateCursor: function(obj, targetOpacity, duration, completeMethod) {

          var tickState;

          tickState = {
            isAborted: false,
            abort: function() {
              this.isAborted = true;
            },
          };

          obj.animate('_currentCursorOpacity', targetOpacity, {
            duration: duration,
            onComplete: function() {
              Iif (!tickState.isAborted) {
                obj[completeMethod]();
              }
            },
            onChange: function() {
              if (obj.canvas) {
                obj.canvas.clearContext(obj.canvas.contextTop || obj.ctx);
                obj.renderCursorOrSelection();
              }
            },
            abort: function() {
              return tickState.isAborted;
            }
          });
          return tickState;
        },

        /**
         * @private
         */
        _onTickComplete: function() {

          var _this = this;

          if (this._cursorTimeout1) {
            clearTimeout(this._cursorTimeout1);
          }
          this._cursorTimeout1 = setTimeout(function() {
            _this._currentTickCompleteState = _this._animateCursor(_this, 0, this.cursorDuration / 2, '_tick');
          }, 100);
        },

        /**
         * Initializes delayed cursor
         */
        initDelayedCursor: function(restart) {
          var _this = this,
              delay = restart ? 0 : this.cursorDelay;

          this._currentTickState && this._currentTickState.abort();
          this._currentTickCompleteState && this._currentTickCompleteState.abort();
          clearTimeout(this._cursorTimeout1);
          this._currentCursorOpacity = 1;
          if (this.canvas) {
            this.canvas.clearContext(this.canvas.contextTop || this.ctx);
            this.renderCursorOrSelection();
          }
          if (this._cursorTimeout2) {
            clearTimeout(this._cursorTimeout2);
          }
          this._cursorTimeout2 = setTimeout(function() {
            _this._tick();
          }, delay);
        },

        /**
         * Aborts cursor animation and clears all timeouts
         */
        abortCursorAnimation: function() {
          this._currentTickState && this._currentTickState.abort();
          this._currentTickCompleteState && this._currentTickCompleteState.abort();

          clearTimeout(this._cursorTimeout1);
          clearTimeout(this._cursorTimeout2);

          this._currentCursorOpacity = 0;
          this.canvas && this.canvas.clearContext(this.canvas.contextTop || this.ctx);
        },

        /**
         * Selects entire text
         */
        selectAll: function() {
          this.setSelectionStart(0);
          this.setSelectionEnd(this.text.length);
        },

        /**
         * Returns selected text
         * @return {String}
         */
        getSelectedText: function() {
          return this.text.slice(this.selectionStart, this.selectionEnd);
        },

        /**
         * Find new selection index representing start of current word according to current selection index
         * @param {Number} startFrom Surrent selection index
         * @return {Number} New selection index
         */
        findWordBoundaryLeft: function(startFrom) {
          var offset = 0, index = startFrom - 1;

          // remove space before cursor first
          Iif (this._reSpace.test(this.text.charAt(index))) {
            while (this._reSpace.test(this.text.charAt(index))) {
              offset++;
              index--;
            }
          }
          while (/\S/.test(this.text.charAt(index)) && index > -1) {
            offset++;
            index--;
          }

          return startFrom - offset;
        },

        /**
         * Find new selection index representing end of current word according to current selection index
         * @param {Number} startFrom Current selection index
         * @return {Number} New selection index
         */
        findWordBoundaryRight: function(startFrom) {
          var offset = 0, index = startFrom;

          // remove space after cursor first
          Iif (this._reSpace.test(this.text.charAt(index))) {
            while (this._reSpace.test(this.text.charAt(index))) {
              offset++;
              index++;
            }
          }
          while (/\S/.test(this.text.charAt(index)) && index < this.text.length) {
            offset++;
            index++;
          }

          return startFrom + offset;
        },

        /**
         * Find new selection index representing start of current line according to current selection index
         * @param {Number} startFrom Current selection index
         * @return {Number} New selection index
         */
        findLineBoundaryLeft: function(startFrom) {
          var offset = 0, index = startFrom - 1;

          while (!/\n/.test(this.text.charAt(index)) && index > -1) {
            offset++;
            index--;
          }

          return startFrom - offset;
        },

        /**
         * Find new selection index representing end of current line according to current selection index
         * @param {Number} startFrom Current selection index
         * @return {Number} New selection index
         */
        findLineBoundaryRight: function(startFrom) {
          var offset = 0, index = startFrom;

          while (!/\n/.test(this.text.charAt(index)) && index < this.text.length) {
            offset++;
            index++;
          }

          return startFrom + offset;
        },

        /**
         * Returns number of newlines in selected text
         * @return {Number} Number of newlines in selected text
         */
        getNumNewLinesInSelectedText: function() {
          var selectedText = this.getSelectedText(),
              numNewLines  = 0;

          for (var i = 0, len = selectedText.length; i < len; i++) {
            if (selectedText[i] === '\n') {
              numNewLines++;
            }
          }
          return numNewLines;
        },

        /**
         * Finds index corresponding to beginning or end of a word
         * @param {Number} selectionStart Index of a character
         * @param {Number} direction 1 or -1
         * @return {Number} Index of the beginning or end of a word
         */
        searchWordBoundary: function(selectionStart, direction) {
          var index     = this._reSpace.test(this.text.charAt(selectionStart)) ? selectionStart - 1 : selectionStart,
              _char     = this.text.charAt(index),
              reNonWord = /[ \n\.,;!\?\-]/;

          while (!reNonWord.test(_char) && index > 0 && index < this.text.length) {
            index += direction;
            _char = this.text.charAt(index);
          }
          if (reNonWord.test(_char) && _char !== '\n') {
            index += direction === 1 ? 0 : 1;
          }
          return index;
        },

        /**
         * Selects a word based on the index
         * @param {Number} selectionStart Index of a character
         */
        selectWord: function(selectionStart) {
          var newSelectionStart = this.searchWordBoundary(selectionStart, -1), /* search backwards */
              newSelectionEnd   = this.searchWordBoundary(selectionStart, 1);
          /* search forward */

          this.setSelectionStart(newSelectionStart);
          this.setSelectionEnd(newSelectionEnd);
        },

        /**
         * Selects a line based on the index
         * @param {Number} selectionStart Index of a character
         */
        selectLine: function(selectionStart) {
          var newSelectionStart = this.findLineBoundaryLeft(selectionStart),
              newSelectionEnd   = this.findLineBoundaryRight(selectionStart);

          this.setSelectionStart(newSelectionStart);
          this.setSelectionEnd(newSelectionEnd);
        },

        /**
         * Enters editing state
         * @return {fabric.IText} thisArg
         * @chainable
         */
        enterEditing: function(e) {
          Iif (this.isEditing || !this.editable) {
            return;
          }

          Iif (this.canvas) {
            this.exitEditingOnOthers(this.canvas);
          }

          this.isEditing = true;

          this.initHiddenTextarea(e);
          this.hiddenTextarea.focus();
          this._updateTextarea();
          this._saveEditingProps();
          this._setEditingProps();
          this._textBeforeEdit = this.text;

          this._tick();
          this.fire('editing:entered');

          Eif (!this.canvas) {
            return this;
          }

          this.canvas.renderAll();
          this.canvas.fire('text:editing:entered', { target: this });
          this.initMouseMoveHandler();
          return this;
        },

        exitEditingOnOthers: function(canvas) {
          Eif (canvas._iTextInstances) {
            canvas._iTextInstances.forEach(function(obj) {
              obj.selected = false;
              Iif (obj.isEditing) {
                obj.exitEditing();
              }
            });
          }
        },

        /**
         * Initializes "mousemove" event handler
         */
        initMouseMoveHandler: function() {
          var _this = this;
          this.canvas.on('mouse:move', function(options) {
            if (!_this.__isMousedown || !_this.isEditing) {
              return;
            }

            var newSelectionStart = _this.getSelectionStartFromPointer(options.e);
            if (newSelectionStart >= _this.__selectionStartOnMouseDown) {
              _this.setSelectionStart(_this.__selectionStartOnMouseDown);
              _this.setSelectionEnd(newSelectionStart);
            }
            else {
              _this.setSelectionStart(newSelectionStart);
              _this.setSelectionEnd(_this.__selectionStartOnMouseDown);
            }
          });
        },

        /**
         * @private
         */
        _setEditingProps: function() {
          this.hoverCursor = 'text';

          Iif (this.canvas) {
            this.canvas.defaultCursor = this.canvas.moveCursor = 'text';
          }

          this.borderColor = this.editingBorderColor;

          this.hasControls = this.selectable = false;
          this.lockMovementX = this.lockMovementY = true;
        },

        /**
         * @private
         */
        _updateTextarea: function() {
          if (!this.hiddenTextarea || this.inCompositionMode) {
            return;
          }

          this.hiddenTextarea.value = this.text;
          this.hiddenTextarea.selectionStart = this.selectionStart;
          this.hiddenTextarea.selectionEnd = this.selectionEnd;
          Eif (this.selectionStart === this.selectionEnd) {
            var p = this._calcTextareaPosition();
            this.hiddenTextarea.style.left = p.x + 'px';
            this.hiddenTextarea.style.top = p.y + 'px';
          }
        },

        /**
         * @private
         */
        _calcTextareaPosition: function() {
          var chars = this.text.split(''),
              boundaries = this._getCursorBoundaries(chars, 'cursor'),
              cursorLocation = this.get2DCursorLocation(),
              lineIndex = cursorLocation.lineIndex,
              charIndex = cursorLocation.charIndex,
              charHeight = this.getCurrentCharFontSize(lineIndex, charIndex),
              leftOffset = (lineIndex === 0 && charIndex === 0)
                        ? this._getLineLeftOffset(this._getLineWidth(this.ctx, lineIndex))
                        : boundaries.leftOffset,
              m = this.calcTransformMatrix(),
              p = { x: boundaries.left + leftOffset, y: boundaries.top + boundaries.topOffset + charHeight };
          this.hiddenTextarea.style.fontSize = charHeight + 'px';
          return fabric.util.transformPoint(p, m);
        },

        /**
         * @private
         */
        _saveEditingProps: function() {
          this._savedProps = {
            hasControls: this.hasControls,
            borderColor: this.borderColor,
            lockMovementX: this.lockMovementX,
            lockMovementY: this.lockMovementY,
            hoverCursor: this.hoverCursor,
            defaultCursor: this.canvas && this.canvas.defaultCursor,
            moveCursor: this.canvas && this.canvas.moveCursor
          };
        },

        /**
         * @private
         */
        _restoreEditingProps: function() {
          Iif (!this._savedProps) {
            return;
          }

          this.hoverCursor = this._savedProps.overCursor;
          this.hasControls = this._savedProps.hasControls;
          this.borderColor = this._savedProps.borderColor;
          this.lockMovementX = this._savedProps.lockMovementX;
          this.lockMovementY = this._savedProps.lockMovementY;

          Iif (this.canvas) {
            this.canvas.defaultCursor = this._savedProps.defaultCursor;
            this.canvas.moveCursor = this._savedProps.moveCursor;
          }
        },

        /**
         * Exits from editing state
         * @return {fabric.IText} thisArg
         * @chainable
         */
        exitEditing: function() {
          var isTextChanged = (this._textBeforeEdit !== this.text);
          this.selected = false;
          this.isEditing = false;
          this.selectable = true;

          this.selectionEnd = this.selectionStart;
          this.hiddenTextarea && this.canvas && this.hiddenTextarea.parentNode.removeChild(this.hiddenTextarea);
          this.hiddenTextarea = null;

          this.abortCursorAnimation();
          this._restoreEditingProps();
          this._currentCursorOpacity = 0;

          this.fire('editing:exited');
          isTextChanged && this.fire('modified');
          Iif (this.canvas) {
            this.canvas.fire('text:editing:exited', { target: this });
            isTextChanged && this.canvas.fire('object:modified', { target: this });
          }

          return this;
        },

        /**
         * @private
         */
        _removeExtraneousStyles: function() {
          for (var prop in this.styles) {
            if (!this._textLines[prop]) {
              delete this.styles[prop];
            }
          }
        },

        /**
         * @private
         */
        _removeCharsFromTo: function(start, end) {
          while (end !== start) {
            this._removeSingleCharAndStyle(start + 1);
            end--;
          }
          this.setSelectionStart(start);
        },

        _removeSingleCharAndStyle: function(index) {
          var isBeginningOfLine = this.text[index - 1] === '\n',
              indexStyle        = isBeginningOfLine ? index : index - 1;
          this.removeStyleObject(isBeginningOfLine, indexStyle);
          this.text = this.text.slice(0, index - 1) +
            this.text.slice(index);

          this._textLines = this._splitTextIntoLines();
        },

        /**
         * Inserts characters where cursor is (replacing selection if one exists)
         * @param {String} _chars Characters to insert
         * @param {Boolean} useCopiedStyle use fabric.copiedTextStyle
         */
        insertChars: function(_chars, useCopiedStyle) {
          var style;

          if (this.selectionEnd - this.selectionStart > 1) {
            this._removeCharsFromTo(this.selectionStart, this.selectionEnd);
            this.setSelectionEnd(this.selectionStart);
          }
          //short circuit for block paste
          if (!useCopiedStyle && this.isEmptyStyles()) {
            this.insertChar(_chars, false);
            return;
          }
          for (var i = 0, len = _chars.length; i < len; i++) {
            Eif (useCopiedStyle) {
              style = fabric.copiedTextStyle[i];
            }
            this.insertChar(_chars[i], i < len - 1, style);
          }
        },

        /**
         * Inserts a character where cursor is
         * @param {String} _char Characters to insert
         * @param {Boolean} skipUpdate trigger rendering and updates at the end of text insert
         * @param {Object} styleObject Style to be inserted for the new char
         */
        insertChar: function(_char, skipUpdate, styleObject) {
          var isEndOfLine = this.text[this.selectionStart] === '\n';
          this.text = this.text.slice(0, this.selectionStart) +
            _char + this.text.slice(this.selectionEnd);
          this._textLines = this._splitTextIntoLines();
          this.insertStyleObjects(_char, isEndOfLine, styleObject);
          this.selectionStart += _char.length;
          this.selectionEnd = this.selectionStart;
          if (skipUpdate) {
            return;
          }
          this._updateTextarea();
          this.canvas && this.canvas.renderAll();
          this.setCoords();
          this.fire('changed');
          this.canvas && this.canvas.fire('text:changed', { target: this });
        },

        /**
         * Inserts new style object
         * @param {Number} lineIndex Index of a line
         * @param {Number} charIndex Index of a char
         * @param {Boolean} isEndOfLine True if it's end of line
         */
        insertNewlineStyleObject: function(lineIndex, charIndex, isEndOfLine) {

          this.shiftLineStyles(lineIndex, +1);

          if (!this.styles[lineIndex + 1]) {
            this.styles[lineIndex + 1] = {};
          }

          var currentCharStyle = {},
              newLineStyles    = {};

          Iif (this.styles[lineIndex] && this.styles[lineIndex][charIndex - 1]) {
            currentCharStyle = this.styles[lineIndex][charIndex - 1];
          }

          // if there's nothing after cursor,
          // we clone current char style onto the next (otherwise empty) line
          if (isEndOfLine) {
            newLineStyles[0] = clone(currentCharStyle);
            this.styles[lineIndex + 1] = newLineStyles;
          }
          // otherwise we clone styles of all chars
          // after cursor onto the next line, from the beginning
          else {
            for (var index in this.styles[lineIndex]) {
              if (parseInt(index, 10) >= charIndex) {
                newLineStyles[parseInt(index, 10) - charIndex] = this.styles[lineIndex][index];
                // remove lines from the previous line since they're on a new line now
                delete this.styles[lineIndex][index];
              }
            }
            this.styles[lineIndex + 1] = newLineStyles;
          }
          this._forceClearCache = true;
        },

        /**
         * Inserts style object for a given line/char index
         * @param {Number} lineIndex Index of a line
         * @param {Number} charIndex Index of a char
         * @param {Object} [style] Style object to insert, if given
         */
        insertCharStyleObject: function(lineIndex, charIndex, style) {

          var currentLineStyles       = this.styles[lineIndex],
              currentLineStylesCloned = clone(currentLineStyles);

          if (charIndex === 0 && !style) {
            charIndex = 1;
          }

          // shift all char styles by 1 forward
          // 0,1,2,3 -> (charIndex=2) -> 0,1,3,4 -> (insert 2) -> 0,1,2,3,4
          for (var index in currentLineStylesCloned) {
            var numericIndex = parseInt(index, 10);

            Iif (numericIndex >= charIndex) {
              currentLineStyles[numericIndex + 1] = currentLineStylesCloned[numericIndex];

              // only delete the style if there was nothing moved there
              if (!currentLineStylesCloned[numericIndex - 1]) {
                delete currentLineStyles[numericIndex];
              }
            }
          }

          this.styles[lineIndex][charIndex] =
            style || clone(currentLineStyles[charIndex - 1]);
          this._forceClearCache = true;
        },

        /**
         * Inserts style object(s)
         * @param {String} _chars Characters at the location where style is inserted
         * @param {Boolean} isEndOfLine True if it's end of line
         * @param {Object} [styleObject] Style to insert
         */
        insertStyleObjects: function(_chars, isEndOfLine, styleObject) {
          // removed shortcircuit over isEmptyStyles

          var cursorLocation = this.get2DCursorLocation(),
              lineIndex      = cursorLocation.lineIndex,
              charIndex      = cursorLocation.charIndex;

          if (!this._getLineStyle(lineIndex)) {
            this._setLineStyle(lineIndex, {});
          }

          if (_chars === '\n') {
            this.insertNewlineStyleObject(lineIndex, charIndex, isEndOfLine);
          }
          else {
            this.insertCharStyleObject(lineIndex, charIndex, styleObject);
          }
        },

        /**
         * Shifts line styles up or down
         * @param {Number} lineIndex Index of a line
         * @param {Number} offset Can be -1 or +1
         */
        shiftLineStyles: function(lineIndex, offset) {
          // shift all line styles by 1 upward
          var clonedStyles = clone(this.styles);
          for (var line in this.styles) {
            var numericLine = parseInt(line, 10);
            if (numericLine > lineIndex) {
              this.styles[numericLine + offset] = clonedStyles[numericLine];
              if (!clonedStyles[numericLine - offset]) {
                delete this.styles[numericLine];
              }
            }
          }
          //TODO: evaluate if delete old style lines with offset -1
        },

        /**
         * Removes style object
         * @param {Boolean} isBeginningOfLine True if cursor is at the beginning of line
         * @param {Number} [index] Optional index. When not given, current selectionStart is used.
         */
        removeStyleObject: function(isBeginningOfLine, index) {

          var cursorLocation = this.get2DCursorLocation(index),
              lineIndex      = cursorLocation.lineIndex,
              charIndex      = cursorLocation.charIndex;

          this._removeStyleObject(isBeginningOfLine, cursorLocation, lineIndex, charIndex);
        },

        _getTextOnPreviousLine: function(lIndex) {
          return this._textLines[lIndex - 1];
        },

        _removeStyleObject: function(isBeginningOfLine, cursorLocation, lineIndex, charIndex) {

          Iif (isBeginningOfLine) {
            var textOnPreviousLine     = this._getTextOnPreviousLine(cursorLocation.lineIndex),
                newCharIndexOnPrevLine = textOnPreviousLine ? textOnPreviousLine.length : 0;

            if (!this.styles[lineIndex - 1]) {
              this.styles[lineIndex - 1] = {};
            }
            for (charIndex in this.styles[lineIndex]) {
              this.styles[lineIndex - 1][parseInt(charIndex, 10) + newCharIndexOnPrevLine]
                = this.styles[lineIndex][charIndex];
            }
            this.shiftLineStyles(cursorLocation.lineIndex, -1);
          }
          else {
            var currentLineStyles = this.styles[lineIndex];

            Eif (currentLineStyles) {
              delete currentLineStyles[charIndex];
            }
            var currentLineStylesCloned = clone(currentLineStyles);
            // shift all styles by 1 backwards
            for (var i in currentLineStylesCloned) {
              var numericIndex = parseInt(i, 10);
              Eif (numericIndex >= charIndex && numericIndex !== 0) {
                currentLineStyles[numericIndex - 1] = currentLineStylesCloned[numericIndex];
                delete currentLineStyles[numericIndex];
              }
            }
          }
        },

        /**
         * Inserts new line
         */
        insertNewline: function() {
          this.insertChars('\n');
        }
      });
    })();

    fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {
      /**
       * Initializes "dbclick" event handler
       */
      initDoubleClickSimulation: function() {

        // for double click
        this.__lastClickTime = +new Date();

        // for triple click
        this.__lastLastClickTime = +new Date();

        this.__lastPointer = { };

        this.on('mousedown', this.onMouseDown.bind(this));
      },

      onMouseDown: function(options) {

        this.__newClickTime = +new Date();
        var newPointer = this.canvas.getPointer(options.e);

        if (this.isTripleClick(newPointer)) {
          this.fire('tripleclick', options);
          this._stopEvent(options.e);
        }
        else if (this.isDoubleClick(newPointer)) {
          this.fire('dblclick', options);
          this._stopEvent(options.e);
        }

        this.__lastLastClickTime = this.__lastClickTime;
        this.__lastClickTime = this.__newClickTime;
        this.__lastPointer = newPointer;
        this.__lastIsEditing = this.isEditing;
        this.__lastSelected = this.selected;
      },

      isDoubleClick: function(newPointer) {
        return this.__newClickTime - this.__lastClickTime < 500 &&
            this.__lastPointer.x === newPointer.x &&
            this.__lastPointer.y === newPointer.y && this.__lastIsEditing;
      },

      isTripleClick: function(newPointer) {
        return this.__newClickTime - this.__lastClickTime < 500 &&
            this.__lastClickTime - this.__lastLastClickTime < 500 &&
            this.__lastPointer.x === newPointer.x &&
            this.__lastPointer.y === newPointer.y;
      },

      /**
       * @private
       */
      _stopEvent: function(e) {
        e.preventDefault && e.preventDefault();
        e.stopPropagation && e.stopPropagation();
      },

      /**
       * Initializes event handlers related to cursor or selection
       */
      initCursorSelectionHandlers: function() {
        this.initSelectedHandler();
        this.initMousedownHandler();
        this.initMouseupHandler();
        this.initClicks();
      },

      /**
       * Initializes double and triple click event handlers
       */
      initClicks: function() {
        this.on('dblclick', function(options) {
          this.selectWord(this.getSelectionStartFromPointer(options.e));
        });
        this.on('tripleclick', function(options) {
          this.selectLine(this.getSelectionStartFromPointer(options.e));
        });
      },

      /**
       * Initializes "mousedown" event handler
       */
      initMousedownHandler: function() {
        this.on('mousedown', function(options) {
          if (!this.editable) {
            return;
          }
          var pointer = this.canvas.getPointer(options.e);

          this.__mousedownX = pointer.x;
          this.__mousedownY = pointer.y;
          this.__isMousedown = true;

          if (this.hiddenTextarea && this.canvas) {
            this.canvas.wrapperEl.appendChild(this.hiddenTextarea);
          }

          if (this.selected) {
            this.setCursorByClick(options.e);
          }

          if (this.isEditing) {
            this.__selectionStartOnMouseDown = this.selectionStart;
            this.initDelayedCursor(true);
          }
        });
      },

      /**
       * @private
       */
      _isObjectMoved: function(e) {
        var pointer = this.canvas.getPointer(e);

        return this.__mousedownX !== pointer.x ||
               this.__mousedownY !== pointer.y;
      },

      /**
       * Initializes "mouseup" event handler
       */
      initMouseupHandler: function() {
        this.on('mouseup', function(options) {
          this.__isMousedown = false;
          if (!this.editable || this._isObjectMoved(options.e)) {
            return;
          }

          if (this.__lastSelected && !this.__corner) {
            this.enterEditing(options.e);
            this.initDelayedCursor(true);
          }
          this.selected = true;
        });
      },

      /**
       * Changes cursor location in a text depending on passed pointer (x/y) object
       * @param {Event} e Event object
       */
      setCursorByClick: function(e) {
        var newSelectionStart = this.getSelectionStartFromPointer(e);

        if (e.shiftKey) {
          if (newSelectionStart < this.selectionStart) {
            this.setSelectionEnd(this.selectionStart);
            this.setSelectionStart(newSelectionStart);
          }
          else {
            this.setSelectionEnd(newSelectionStart);
          }
        }
        else {
          this.setSelectionStart(newSelectionStart);
          this.setSelectionEnd(newSelectionStart);
        }
      },

      /**
       * Returns index of a character corresponding to where an object was clicked
       * @param {Event} e Event object
       * @return {Number} Index of a character
       */
      getSelectionStartFromPointer: function(e) {
        var mouseOffset = this.getLocalPointer(e),
            prevWidth = 0,
            width = 0,
            height = 0,
            charIndex = 0,
            newSelectionStart,
            line;

        for (var i = 0, len = this._textLines.length; i < len; i++) {
          line = this._textLines[i];
          height += this._getHeightOfLine(this.ctx, i) * this.scaleY;

          var widthOfLine = this._getLineWidth(this.ctx, i),
              lineLeftOffset = this._getLineLeftOffset(widthOfLine);

          width = lineLeftOffset * this.scaleX;

          for (var j = 0, jlen = line.length; j < jlen; j++) {

            prevWidth = width;

            width += this._getWidthOfChar(this.ctx, line[j], i, this.flipX ? jlen - j : j) *
                     this.scaleX;

            if (height <= mouseOffset.y || width <= mouseOffset.x) {
              charIndex++;
              continue;
            }

            return this._getNewSelectionStartFromOffset(
              mouseOffset, prevWidth, width, charIndex + i, jlen);
          }

          if (mouseOffset.y < height) {
            //this happens just on end of lines.
            return this._getNewSelectionStartFromOffset(
              mouseOffset, prevWidth, width, charIndex + i - 1, jlen);
          }
        }

        // clicked somewhere after all chars, so set at the end
        if (typeof newSelectionStart === 'undefined') {
          return this.text.length;
        }
      },

      /**
       * @private
       */
      _getNewSelectionStartFromOffset: function(mouseOffset, prevWidth, width, index, jlen) {

        var distanceBtwLastCharAndCursor = mouseOffset.x - prevWidth,
            distanceBtwNextCharAndCursor = width - mouseOffset.x,
            offset = distanceBtwNextCharAndCursor > distanceBtwLastCharAndCursor ? 0 : 1,
            newSelectionStart = index + offset;

        // if object is horizontally flipped, mirror cursor location from the end
        if (this.flipX) {
          newSelectionStart = jlen - newSelectionStart;
        }

        if (newSelectionStart > this.text.length) {
          newSelectionStart = this.text.length;
        }

        return newSelectionStart;
      }
    });

    fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {

      /**
       * Initializes hidden textarea (needed to bring up keyboard in iOS)
       */
      initHiddenTextarea: function(e) {
        var p;
        Iif (e && this.canvas) {
          p = this.canvas.getPointer(e);
        }
        else {
          this.oCoords || this.setCoords();
          p = this.oCoords.tl;
        }
        this.hiddenTextarea = fabric.document.createElement('textarea');

        this.hiddenTextarea.setAttribute('autocapitalize', 'off');
        this.hiddenTextarea.style.cssText = 'position: absolute; top: ' + p.y + 'px; left: ' + p.x + 'px; opacity: 0;'
                                            + ' width: 0px; height: 0px; z-index: -999;';
        Iif (this.canvas) {
          this.canvas.lowerCanvasEl.parentNode.appendChild(this.hiddenTextarea);
        }
        else {
          fabric.document.body.appendChild(this.hiddenTextarea);
        }

        fabric.util.addListener(this.hiddenTextarea, 'keydown', this.onKeyDown.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'keyup', this.onKeyUp.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'input', this.onInput.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'copy', this.copy.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'cut', this.cut.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'paste', this.paste.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'compositionstart', this.onCompositionStart.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'compositionupdate', this.onCompositionUpdate.bind(this));
        fabric.util.addListener(this.hiddenTextarea, 'compositionend', this.onCompositionEnd.bind(this));

        Iif (!this._clickHandlerInitialized && this.canvas) {
          fabric.util.addListener(this.canvas.upperCanvasEl, 'click', this.onClick.bind(this));
          this._clickHandlerInitialized = true;
        }
      },

      /**
       * @private
       */
      _keysMap: {
        8:  'removeChars',
        9:  'exitEditing',
        27: 'exitEditing',
        13: 'insertNewline',
        33: 'moveCursorUp',
        34: 'moveCursorDown',
        35: 'moveCursorRight',
        36: 'moveCursorLeft',
        37: 'moveCursorLeft',
        38: 'moveCursorUp',
        39: 'moveCursorRight',
        40: 'moveCursorDown',
        46: 'forwardDelete'
      },

      /**
       * @private
       */
      _ctrlKeysMapUp: {
        67: 'copy',
        88: 'cut'
      },

      /**
       * @private
       */
      _ctrlKeysMapDown: {
        65: 'selectAll'
      },

      onClick: function() {
        // No need to trigger click event here, focus is enough to have the keyboard appear on Android
        this.hiddenTextarea && this.hiddenTextarea.focus();
      },

      /**
       * Handles keyup event
       * @param {Event} e Event object
       */
      onKeyDown: function(e) {
        if (!this.isEditing) {
          return;
        }
        if (e.keyCode in this._keysMap) {
          this[this._keysMap[e.keyCode]](e);
        }
        else if ((e.keyCode in this._ctrlKeysMapDown) && (e.ctrlKey || e.metaKey)) {
          this[this._ctrlKeysMapDown[e.keyCode]](e);
        }
        else {
          return;
        }
        e.stopImmediatePropagation();
        e.preventDefault();
        this.canvas && this.canvas.renderAll();
      },

      /**
       * Handles keyup event
       * We handle KeyUp because ie11 and edge have difficulties copy/pasting
       * if a copy/cut event fired, keyup is dismissed
       * @param {Event} e Event object
       */
      onKeyUp: function(e) {
        if (!this.isEditing || this._copyDone) {
          this._copyDone = false;
          return;
        }
        if ((e.keyCode in this._ctrlKeysMapUp) && (e.ctrlKey || e.metaKey)) {
          this[this._ctrlKeysMapUp[e.keyCode]](e);
        }
        else {
          return;
        }
        e.stopImmediatePropagation();
        e.preventDefault();
        this.canvas && this.canvas.renderAll();
      },

      /**
       * Handles onInput event
       * @param {Event} e Event object
       */
      onInput: function(e) {
        if (!this.isEditing || this.inCompositionMode) {
          return;
        }
        var offset = this.selectionStart || 0,
            offsetEnd = this.selectionEnd || 0,
            textLength = this.text.length,
            newTextLength = this.hiddenTextarea.value.length,
            diff, charsToInsert, start;
        if (newTextLength > textLength) {
          //we added some character
          start = this._selectionDirection === 'left' ? offsetEnd : offset;
          diff = newTextLength - textLength;
          charsToInsert = this.hiddenTextarea.value.slice(start, start + diff);
        }
        else {
          //we selected a portion of text and then input something else.
          //Internet explorer does not trigger this else
          diff = newTextLength - textLength + offsetEnd - offset;
          charsToInsert = this.hiddenTextarea.value.slice(offset, offset + diff);
        }
        this.insertChars(charsToInsert);
        e.stopPropagation();
      },

      /**
       * Composition start
       */
      onCompositionStart: function() {
        this.inCompositionMode = true;
        this.prevCompositionLength = 0;
        this.compositionStart = this.selectionStart;
      },

      /**
       * Composition end
       */
      onCompositionEnd: function() {
        this.inCompositionMode = false;
      },

      /**
       * Composition update
       */
      onCompositionUpdate: function(e) {
        var data = e.data;
        this.selectionStart = this.compositionStart;
        this.selectionEnd = this.selectionEnd === this.selectionStart ?
          this.compositionStart + this.prevCompositionLength : this.selectionEnd;
        this.insertChars(data, false);
        this.prevCompositionLength = data.length;
      },

      /**
       * Forward delete
       */
      forwardDelete: function(e) {
        if (this.selectionStart === this.selectionEnd) {
          if (this.selectionStart === this.text.length) {
            return;
          }
          this.moveCursorRight(e);
        }
        this.removeChars(e);
      },

      /**
       * Copies selected text
       * @param {Event} e Event object
       */
      copy: function(e) {
        if (this.selectionStart === this.selectionEnd) {
          //do not cut-copy if no selection
          return;
        }
        var selectedText = this.getSelectedText(),
            clipboardData = this._getClipboardData(e);

        // Check for backward compatibility with old browsers
        if (clipboardData) {
          clipboardData.setData('text', selectedText);
        }

        fabric.copiedText = selectedText;
        fabric.copiedTextStyle = this.getSelectionStyles(
                              this.selectionStart,
                              this.selectionEnd);
        e.stopImmediatePropagation();
        e.preventDefault();
        this._copyDone = true;
      },

      /**
       * Pastes text
       * @param {Event} e Event object
       */
      paste: function(e) {
        var copiedText = null,
            clipboardData = this._getClipboardData(e),
            useCopiedStyle = true;

        // Check for backward compatibility with old browsers
        if (clipboardData) {
          copiedText = clipboardData.getData('text').replace(/\r/g, '');
          if (!fabric.copiedTextStyle || fabric.copiedText !== copiedText) {
            useCopiedStyle = false;
          }
        }
        else {
          copiedText = fabric.copiedText;
        }

        if (copiedText) {
          this.insertChars(copiedText, useCopiedStyle);
        }
        e.stopImmediatePropagation();
        e.preventDefault();
      },

      /**
       * Cuts text
       * @param {Event} e Event object
       */
      cut: function(e) {
        if (this.selectionStart === this.selectionEnd) {
          return;
        }

        this.copy(e);
        this.removeChars(e);
      },

      /**
       * @private
       * @param {Event} e Event object
       * @return {Object} Clipboard data object
       */
      _getClipboardData: function(e) {
        return (e && e.clipboardData) || fabric.window.clipboardData;
      },

      /**
       * Gets start offset of a selection
       * @param {Event} e Event object
       * @param {Boolean} isRight
       * @return {Number}
       */
      getDownCursorOffset: function(e, isRight) {
        var selectionProp = isRight ? this.selectionEnd : this.selectionStart,
            cursorLocation = this.get2DCursorLocation(selectionProp),
            _char, lineLeftOffset, lineIndex = cursorLocation.lineIndex,
            textOnSameLineBeforeCursor = this._textLines[lineIndex].slice(0, cursorLocation.charIndex),
            textOnSameLineAfterCursor = this._textLines[lineIndex].slice(cursorLocation.charIndex),
            textOnNextLine = this._textLines[lineIndex + 1] || '';

        // if on last line, down cursor goes to end of line
        if (lineIndex === this._textLines.length - 1 || e.metaKey || e.keyCode === 34) {

          // move to the end of a text
          return this.text.length - selectionProp;
        }

        var widthOfSameLineBeforeCursor = this._getLineWidth(this.ctx, lineIndex);
        lineLeftOffset = this._getLineLeftOffset(widthOfSameLineBeforeCursor);

        var widthOfCharsOnSameLineBeforeCursor = lineLeftOffset;

        for (var i = 0, len = textOnSameLineBeforeCursor.length; i < len; i++) {
          _char = textOnSameLineBeforeCursor[i];
          widthOfCharsOnSameLineBeforeCursor += this._getWidthOfChar(this.ctx, _char, lineIndex, i);
        }

        var indexOnNextLine = this._getIndexOnNextLine(
          cursorLocation, textOnNextLine, widthOfCharsOnSameLineBeforeCursor);

        return textOnSameLineAfterCursor.length + 1 + indexOnNextLine;
      },

      /**
       * @private
       */
      _getIndexOnNextLine: function(cursorLocation, textOnNextLine, widthOfCharsOnSameLineBeforeCursor) {
        var lineIndex = cursorLocation.lineIndex + 1,
            widthOfNextLine = this._getLineWidth(this.ctx, lineIndex),
            lineLeftOffset = this._getLineLeftOffset(widthOfNextLine),
            widthOfCharsOnNextLine = lineLeftOffset,
            indexOnNextLine = 0,
            foundMatch;

        for (var j = 0, jlen = textOnNextLine.length; j < jlen; j++) {

          var _char = textOnNextLine[j],
              widthOfChar = this._getWidthOfChar(this.ctx, _char, lineIndex, j);

          widthOfCharsOnNextLine += widthOfChar;

          if (widthOfCharsOnNextLine > widthOfCharsOnSameLineBeforeCursor) {

            foundMatch = true;

            var leftEdge = widthOfCharsOnNextLine - widthOfChar,
                rightEdge = widthOfCharsOnNextLine,
                offsetFromLeftEdge = Math.abs(leftEdge - widthOfCharsOnSameLineBeforeCursor),
                offsetFromRightEdge = Math.abs(rightEdge - widthOfCharsOnSameLineBeforeCursor);

            indexOnNextLine = offsetFromRightEdge < offsetFromLeftEdge ? j + 1 : j;

            break;
          }
        }

        // reached end
        if (!foundMatch) {
          indexOnNextLine = textOnNextLine.length;
        }

        return indexOnNextLine;
      },

      /**
       * Moves cursor down
       * @param {Event} e Event object
       */
      moveCursorDown: function(e) {
        this.abortCursorAnimation();
        this._currentCursorOpacity = 1;

        var offset = this.getDownCursorOffset(e, this._selectionDirection === 'right');

        if (e.shiftKey) {
          this.moveCursorDownWithShift(offset);
        }
        else {
          this.moveCursorDownWithoutShift(offset);
        }

        this.initDelayedCursor();
      },

      /**
       * Moves cursor down without keeping selection
       * @param {Number} offset
       */
      moveCursorDownWithoutShift: function(offset) {
        this._selectionDirection = 'right';
        this.setSelectionStart(this.selectionStart + offset);
        this.setSelectionEnd(this.selectionStart);
      },

      /**
       * private
       */
      swapSelectionPoints: function() {
        var swapSel = this.selectionEnd;
        this.setSelectionEnd(this.selectionStart);
        this.setSelectionStart(swapSel);
      },

      /**
       * Moves cursor down while keeping selection
       * @param {Number} offset
       */
      moveCursorDownWithShift: function(offset) {
        if (this.selectionEnd === this.selectionStart) {
          this._selectionDirection = 'right';
        }
        if (this._selectionDirection === 'right') {
          this.setSelectionEnd(this.selectionEnd + offset);
        }
        else {
          this.setSelectionStart(this.selectionStart + offset);
        }
        if (this.selectionEnd < this.selectionStart  && this._selectionDirection === 'left') {
          this.swapSelectionPoints();
          this._selectionDirection = 'right';
        }
        if (this.selectionEnd > this.text.length) {
          this.setSelectionEnd(this.text.length);
        }
      },

      /**
       * @param {Event} e Event object
       * @param {Boolean} isRight
       * @return {Number}
       */
      getUpCursorOffset: function(e, isRight) {
        var selectionProp = isRight ? this.selectionEnd : this.selectionStart,
            cursorLocation = this.get2DCursorLocation(selectionProp),
            lineIndex = cursorLocation.lineIndex;
        // if on first line, up cursor goes to start of line
        if (lineIndex === 0 || e.metaKey || e.keyCode === 33) {
          return selectionProp;
        }

        var textOnSameLineBeforeCursor = this._textLines[lineIndex].slice(0, cursorLocation.charIndex),
            textOnPreviousLine = this._textLines[lineIndex - 1] || '',
            _char,
            widthOfSameLineBeforeCursor = this._getLineWidth(this.ctx, cursorLocation.lineIndex),
            lineLeftOffset = this._getLineLeftOffset(widthOfSameLineBeforeCursor),
            widthOfCharsOnSameLineBeforeCursor = lineLeftOffset;

        for (var i = 0, len = textOnSameLineBeforeCursor.length; i < len; i++) {
          _char = textOnSameLineBeforeCursor[i];
          widthOfCharsOnSameLineBeforeCursor += this._getWidthOfChar(this.ctx, _char, lineIndex, i);
        }

        var indexOnPrevLine = this._getIndexOnPrevLine(
          cursorLocation, textOnPreviousLine, widthOfCharsOnSameLineBeforeCursor);

        return textOnPreviousLine.length - indexOnPrevLine + textOnSameLineBeforeCursor.length;
      },

      /**
       * @private
       */
      _getIndexOnPrevLine: function(cursorLocation, textOnPreviousLine, widthOfCharsOnSameLineBeforeCursor) {

        var lineIndex = cursorLocation.lineIndex - 1,
            widthOfPreviousLine = this._getLineWidth(this.ctx, lineIndex),
            lineLeftOffset = this._getLineLeftOffset(widthOfPreviousLine),
            widthOfCharsOnPreviousLine = lineLeftOffset,
            indexOnPrevLine = 0,
            foundMatch;

        for (var j = 0, jlen = textOnPreviousLine.length; j < jlen; j++) {

          var _char = textOnPreviousLine[j],
              widthOfChar = this._getWidthOfChar(this.ctx, _char, lineIndex, j);

          widthOfCharsOnPreviousLine += widthOfChar;

          if (widthOfCharsOnPreviousLine > widthOfCharsOnSameLineBeforeCursor) {

            foundMatch = true;

            var leftEdge = widthOfCharsOnPreviousLine - widthOfChar,
                rightEdge = widthOfCharsOnPreviousLine,
                offsetFromLeftEdge = Math.abs(leftEdge - widthOfCharsOnSameLineBeforeCursor),
                offsetFromRightEdge = Math.abs(rightEdge - widthOfCharsOnSameLineBeforeCursor);

            indexOnPrevLine = offsetFromRightEdge < offsetFromLeftEdge ? j : (j - 1);

            break;
          }
        }

        // reached end
        if (!foundMatch) {
          indexOnPrevLine = textOnPreviousLine.length - 1;
        }

        return indexOnPrevLine;
      },

      /**
       * Moves cursor up
       * @param {Event} e Event object
       */
      moveCursorUp: function(e) {

        this.abortCursorAnimation();
        this._currentCursorOpacity = 1;

        var offset = this.getUpCursorOffset(e, this._selectionDirection === 'right');
        if (e.shiftKey) {
          this.moveCursorUpWithShift(offset);
        }
        else {
          this.moveCursorUpWithoutShift(offset);
        }

        this.initDelayedCursor();
      },

      /**
       * Moves cursor up with shift
       * @param {Number} offset
       */
      moveCursorUpWithShift: function(offset) {
        if (this.selectionEnd === this.selectionStart) {
          this._selectionDirection = 'left';
        }
        if (this._selectionDirection === 'right') {
          this.setSelectionEnd(this.selectionEnd - offset);
        }
        else {
          this.setSelectionStart(this.selectionStart - offset);
        }
        if (this.selectionEnd < this.selectionStart && this._selectionDirection === 'right') {
          this.swapSelectionPoints();
          this._selectionDirection = 'left';
        }
      },

      /**
       * Moves cursor up without shift
       * @param {Number} offset
       */
      moveCursorUpWithoutShift: function(offset) {
        if (this.selectionStart === this.selectionEnd) {
          this.setSelectionStart(this.selectionStart - offset);
        }
        this.setSelectionEnd(this.selectionStart);

        this._selectionDirection = 'left';
      },

      /**
       * Moves cursor left
       * @param {Event} e Event object
       */
      moveCursorLeft: function(e) {
        if (this.selectionStart === 0 && this.selectionEnd === 0) {
          return;
        }

        this.abortCursorAnimation();
        this._currentCursorOpacity = 1;

        if (e.shiftKey) {
          this.moveCursorLeftWithShift(e);
        }
        else {
          this.moveCursorLeftWithoutShift(e);
        }

        this.initDelayedCursor();
      },

      /**
       * @private
       */
      _move: function(e, prop, direction) {
        var propMethod = (prop === 'selectionStart' ? 'setSelectionStart' : 'setSelectionEnd');
        if (e.altKey) {
          this[propMethod](this['findWordBoundary' + direction](this[prop]));
        }
        else if (e.metaKey || e.keyCode === 35 ||  e.keyCode === 36 ) {
          this[propMethod](this['findLineBoundary' + direction](this[prop]));
        }
        else {
          this[propMethod](this[prop] + (direction === 'Left' ? -1 : 1));
        }
      },

      /**
       * @private
       */
      _moveLeft: function(e, prop) {
        this._move(e, prop, 'Left');
      },

      /**
       * @private
       */
      _moveRight: function(e, prop) {
        this._move(e, prop, 'Right');
      },

      /**
       * Moves cursor left without keeping selection
       * @param {Event} e
       */
      moveCursorLeftWithoutShift: function(e) {
        this._selectionDirection = 'left';

        // only move cursor when there is no selection,
        // otherwise we discard it, and leave cursor on same place
        if (this.selectionEnd === this.selectionStart) {
          this._moveLeft(e, 'selectionStart');
        }
        this.setSelectionEnd(this.selectionStart);
      },

      /**
       * Moves cursor left while keeping selection
       * @param {Event} e
       */
      moveCursorLeftWithShift: function(e) {
        if (this._selectionDirection === 'right' && this.selectionStart !== this.selectionEnd) {
          this._moveLeft(e, 'selectionEnd');
        }
        else {
          this._selectionDirection = 'left';
          this._moveLeft(e, 'selectionStart');
        }
      },

      /**
       * Moves cursor right
       * @param {Event} e Event object
       */
      moveCursorRight: function(e) {
        if (this.selectionStart >= this.text.length && this.selectionEnd >= this.text.length) {
          return;
        }

        this.abortCursorAnimation();
        this._currentCursorOpacity = 1;

        if (e.shiftKey) {
          this.moveCursorRightWithShift(e);
        }
        else {
          this.moveCursorRightWithoutShift(e);
        }

        this.initDelayedCursor();
      },

      /**
       * Moves cursor right while keeping selection
       * @param {Event} e
       */
      moveCursorRightWithShift: function(e) {
        if (this._selectionDirection === 'left' && this.selectionStart !== this.selectionEnd) {
          this._moveRight(e, 'selectionStart');
        }
        else {
          this._selectionDirection = 'right';
          this._moveRight(e, 'selectionEnd');
        }
      },

      /**
       * Moves cursor right without keeping selection
       * @param {Event} e Event object
       */
      moveCursorRightWithoutShift: function(e) {
        this._selectionDirection = 'right';

        if (this.selectionStart === this.selectionEnd) {
          this._moveRight(e, 'selectionStart');
          this.setSelectionEnd(this.selectionStart);
        }
        else {
          this.setSelectionEnd(this.selectionEnd + this.getNumNewLinesInSelectedText());
          this.setSelectionStart(this.selectionEnd);
        }
      },

      /**
       * Removes characters selected by selection
       * @param {Event} e Event object
       */
      removeChars: function(e) {
        if (this.selectionStart === this.selectionEnd) {
          this._removeCharsNearCursor(e);
        }
        else {
          this._removeCharsFromTo(this.selectionStart, this.selectionEnd);
        }

        this.setSelectionEnd(this.selectionStart);

        this._removeExtraneousStyles();

        this.canvas && this.canvas.renderAll();

        this.setCoords();
        this.fire('changed');
        this.canvas && this.canvas.fire('text:changed', { target: this });
      },

      /**
       * @private
       * @param {Event} e Event object
       */
      _removeCharsNearCursor: function(e) {
        if (this.selectionStart === 0) {
          return;
        }
        if (e.metaKey) {
          // remove all till the start of current line
          var leftLineBoundary = this.findLineBoundaryLeft(this.selectionStart);

          this._removeCharsFromTo(leftLineBoundary, this.selectionStart);
          this.setSelectionStart(leftLineBoundary);
        }
        else if (e.altKey) {
          // remove all till the start of current word
          var leftWordBoundary = this.findWordBoundaryLeft(this.selectionStart);

          this._removeCharsFromTo(leftWordBoundary, this.selectionStart);
          this.setSelectionStart(leftWordBoundary);
        }
        else {
          this._removeSingleCharAndStyle(this.selectionStart);
          this.setSelectionStart(this.selectionStart - 1);
        }
      }
    });

    /* _TO_SVG_START_ */
    (function() {
      var toFixed = fabric.util.toFixed,
          NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;

      fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {

        /**
         * @private
         */
        _setSVGTextLineText: function(lineIndex, textSpans, height, textLeftOffset, textTopOffset, textBgRects) {
          if (!this._getLineStyle(lineIndex)) {
            fabric.Text.prototype._setSVGTextLineText.call(this,
              lineIndex, textSpans, height, textLeftOffset, textTopOffset);
          }
          else {
            this._setSVGTextLineChars(
              lineIndex, textSpans, height, textLeftOffset, textBgRects);
          }
        },

        /**
         * @private
         */
        _setSVGTextLineChars: function(lineIndex, textSpans, height, textLeftOffset, textBgRects) {

          var chars = this._textLines[lineIndex],
              charOffset = 0,
              lineLeftOffset = this._getLineLeftOffset(this._getLineWidth(this.ctx, lineIndex)) - this.width / 2,
              lineOffset = this._getSVGLineTopOffset(lineIndex),
              heightOfLine = this._getHeightOfLine(this.ctx, lineIndex);

          for (var i = 0, len = chars.length; i < len; i++) {
            var styleDecl = this._getStyleDeclaration(lineIndex, i) || { };

            textSpans.push(
              this._createTextCharSpan(
                chars[i], styleDecl, lineLeftOffset, lineOffset.lineTop + lineOffset.offset, charOffset));

            var charWidth = this._getWidthOfChar(this.ctx, chars[i], lineIndex, i);

            if (styleDecl.textBackgroundColor) {
              textBgRects.push(
                this._createTextCharBg(
                  styleDecl, lineLeftOffset, lineOffset.lineTop, heightOfLine, charWidth, charOffset));
            }

            charOffset += charWidth;
          }
        },

        /**
         * @private
         */
        _getSVGLineTopOffset: function(lineIndex) {
          var lineTopOffset = 0, lastHeight = 0;
          for (var j = 0; j < lineIndex; j++) {
            lineTopOffset += this._getHeightOfLine(this.ctx, j);
          }
          lastHeight = this._getHeightOfLine(this.ctx, j);
          return {
            lineTop: lineTopOffset,
            offset: (this._fontSizeMult - this._fontSizeFraction) * lastHeight / (this.lineHeight * this._fontSizeMult)
          };
        },

        /**
         * @private
         */
        _createTextCharBg: function(styleDecl, lineLeftOffset, lineTopOffset, heightOfLine, charWidth, charOffset) {
          return [
            //jscs:disable validateIndentation
            '\t\t<rect fill="', styleDecl.textBackgroundColor,
            '" x="', toFixed(lineLeftOffset + charOffset, NUM_FRACTION_DIGITS),
            '" y="', toFixed(lineTopOffset - this.height/2, NUM_FRACTION_DIGITS),
            '" width="', toFixed(charWidth, NUM_FRACTION_DIGITS),
            '" height="', toFixed(heightOfLine / this.lineHeight, NUM_FRACTION_DIGITS),
            '"></rect>\n'
            //jscs:enable validateIndentation
          ].join('');
        },

        /**
         * @private
         */
        _createTextCharSpan: function(_char, styleDecl, lineLeftOffset, lineTopOffset, charOffset) {

          var fillStyles = this.getSvgStyles.call(fabric.util.object.extend({
            visible: true,
            fill: this.fill,
            stroke: this.stroke,
            type: 'text',
            getSvgFilter: fabric.Object.prototype.getSvgFilter
          }, styleDecl));

          return [
            //jscs:disable validateIndentation
            '\t\t\t<tspan x="', toFixed(lineLeftOffset + charOffset, NUM_FRACTION_DIGITS), '" y="',
              toFixed(lineTopOffset - this.height/2, NUM_FRACTION_DIGITS), '" ',
              (styleDecl.fontFamily ? 'font-family="' + styleDecl.fontFamily.replace(/"/g, '\'') + '" ': ''),
              (styleDecl.fontSize ? 'font-size="' + styleDecl.fontSize + '" ': ''),
              (styleDecl.fontStyle ? 'font-style="' + styleDecl.fontStyle + '" ': ''),
              (styleDecl.fontWeight ? 'font-weight="' + styleDecl.fontWeight + '" ': ''),
              (styleDecl.textDecoration ? 'text-decoration="' + styleDecl.textDecoration + '" ': ''),
              'style="', fillStyles, '">',
              fabric.util.string.escapeXml(_char),
            '</tspan>\n'
            //jscs:enable validateIndentation
          ].join('');
        }
      });
    })();
    /* _TO_SVG_END_ */

    (function(global) {

      'use strict';

      var fabric = global.fabric || (global.fabric = {}),
          clone  = fabric.util.object.clone;

      /**
       * Textbox class, based on IText, allows the user to resize the text rectangle
       * and wraps lines automatically. Textboxes have their Y scaling locked, the
       * user can only change width. Height is adjusted automatically based on the
       * wrapping of lines.
       * @class fabric.Textbox
       * @extends fabric.IText
       * @mixes fabric.Observable
       * @return {fabric.Textbox} thisArg
       * @see {@link fabric.Textbox#initialize} for constructor definition
       */
      fabric.Textbox = fabric.util.createClass(fabric.IText, fabric.Observable, {

        /**
         * Type of an object
         * @type String
         * @default
         */
        type: 'textbox',

        /**
         * Minimum width of textbox, in pixels.
         * @type Number
         * @default
         */
        minWidth: 20,

        /**
         * Minimum calculated width of a textbox, in pixels.
         * @type Number
         * @default
         */
        dynamicMinWidth: 0,

        /**
         * Cached array of text wrapping.
         * @type Array
         */
        __cachedLines: null,

        /**
         * Override standard Object class values
         */
        lockScalingY: true,

        /**
         * Override standard Object class values
         */
        lockScalingFlip: true,

        /**
         * Constructor. Some scaling related property values are forced. Visibility
         * of controls is also fixed; only the rotation and width controls are
         * made available.
         * @param {String} text Text string
         * @param {Object} [options] Options object
         * @return {fabric.Textbox} thisArg
         */
        initialize: function(text, options) {
          this.ctx = fabric.util.createCanvasElement().getContext('2d');
          this.callSuper('initialize', text, options);
          this.setControlsVisibility(fabric.Textbox.getTextboxControlVisibility());

          // add width to this list of props that effect line wrapping.
          this._dimensionAffectingProps.width = true;
        },

        /**
         * Unlike superclass's version of this function, Textbox does not update
         * its width.
         * @param {CanvasRenderingContext2D} ctx Context to use for measurements
         * @private
         * @override
         */
        _initDimensions: function(ctx) {
          if (this.__skipDimension) {
            return;
          }

          if (!ctx) {
            ctx = fabric.util.createCanvasElement().getContext('2d');
            this._setTextStyles(ctx);
          }

          // clear dynamicMinWidth as it will be different after we re-wrap line
          this.dynamicMinWidth = 0;

          // wrap lines
          this._textLines = this._splitTextIntoLines();

          // if after wrapping, the width is smaller than dynamicMinWidth, change the width and re-wrap
          if (this.dynamicMinWidth > this.width) {
            this._set('width', this.dynamicMinWidth);
          }

          // clear cache and re-calculate height
          this._clearCache();
          this.height = this._getTextHeight(ctx);
        },

        /**
         * Generate an object that translates the style object so that it is
         * broken up by visual lines (new lines and automatic wrapping).
         * The original text styles object is broken up by actual lines (new lines only),
         * which is only sufficient for Text / IText
         * @private
         */
        _generateStyleMap: function() {
          var realLineCount     = 0,
              realLineCharCount = 0,
              charCount         = 0,
              map               = {};

          for (var i = 0; i < this._textLines.length; i++) {
            if (this.text[charCount] === '\n') {
              realLineCharCount = 0;
              charCount++;
              realLineCount++;
            }
            else if (this.text[charCount] === ' ') {
              // this case deals with space's that are removed from end of lines when wrapping
              realLineCharCount++;
              charCount++;
            }

            map[i] = { line: realLineCount, offset: realLineCharCount };

            charCount += this._textLines[i].length;
            realLineCharCount += this._textLines[i].length;
          }

          return map;
        },

        /**
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @param {Boolean} [returnCloneOrEmpty=false]
         * @private
         */
        _getStyleDeclaration: function(lineIndex, charIndex, returnCloneOrEmpty) {
          if (this._styleMap) {
            var map = this._styleMap[lineIndex];
            if (!map) {
              return returnCloneOrEmpty ? { } : null;
            }
            lineIndex = map.line;
            charIndex = map.offset + charIndex;
          }
          return this.callSuper('_getStyleDeclaration', lineIndex, charIndex, returnCloneOrEmpty);
        },

        /**
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @param {Object} style
         * @private
         */
        _setStyleDeclaration: function(lineIndex, charIndex, style) {
          var map = this._styleMap[lineIndex];
          lineIndex = map.line;
          charIndex = map.offset + charIndex;

          this.styles[lineIndex][charIndex] = style;
        },

        /**
         * @param {Number} lineIndex
         * @param {Number} charIndex
         * @private
         */
        _deleteStyleDeclaration: function(lineIndex, charIndex) {
          var map = this._styleMap[lineIndex];
          lineIndex = map.line;
          charIndex = map.offset + charIndex;

          delete this.styles[lineIndex][charIndex];
        },

        /**
         * @param {Number} lineIndex
         * @private
         */
        _getLineStyle: function(lineIndex) {
          var map = this._styleMap[lineIndex];
          return this.styles[map.line];
        },

        /**
         * @param {Number} lineIndex
         * @param {Object} style
         * @private
         */
        _setLineStyle: function(lineIndex, style) {
          var map = this._styleMap[lineIndex];
          this.styles[map.line] = style;
        },

        /**
         * @param {Number} lineIndex
         * @private
         */
        _deleteLineStyle: function(lineIndex) {
          var map = this._styleMap[lineIndex];
          delete this.styles[map.line];
        },

        /**
         * Wraps text using the 'width' property of Textbox. First this function
         * splits text on newlines, so we preserve newlines entered by the user.
         * Then it wraps each line using the width of the Textbox by calling
         * _wrapLine().
         * @param {CanvasRenderingContext2D} ctx Context to use for measurements
         * @param {String} text The string of text that is split into lines
         * @returns {Array} Array of lines
         */
        _wrapText: function(ctx, text) {
          var lines = text.split(this._reNewline), wrapped = [], i;

          for (i = 0; i < lines.length; i++) {
            wrapped = wrapped.concat(this._wrapLine(ctx, lines[i], i));
          }

          return wrapped;
        },

        /**
         * Helper function to measure a string of text, given its lineIndex and charIndex offset
         *
         * @param {CanvasRenderingContext2D} ctx
         * @param {String} text
         * @param {number} lineIndex
         * @param {number} charOffset
         * @returns {number}
         * @private
         */
        _measureText: function(ctx, text, lineIndex, charOffset) {
          var width = 0;
          charOffset = charOffset || 0;

          for (var i = 0, len = text.length; i < len; i++) {
            width += this._getWidthOfChar(ctx, text[i], lineIndex, i + charOffset);
          }

          return width;
        },

        /**
         * Wraps a line of text using the width of the Textbox and a context.
         * @param {CanvasRenderingContext2D} ctx Context to use for measurements
         * @param {String} text The string of text to split into lines
         * @param {Number} lineIndex
         * @returns {Array} Array of line(s) into which the given text is wrapped
         * to.
         */
        _wrapLine: function(ctx, text, lineIndex) {
          var lineWidth        = 0,
              lines            = [],
              line             = '',
              words            = text.split(' '),
              word             = '',
              offset           = 0,
              infix            = ' ',
              wordWidth        = 0,
              infixWidth       = 0,
              largestWordWidth = 0,
              lineJustStarted = true;

          for (var i = 0; i < words.length; i++) {
            word = words[i];
            wordWidth = this._measureText(ctx, word, lineIndex, offset);

            offset += word.length;

            lineWidth += infixWidth + wordWidth;

            if (lineWidth >= this.width && !lineJustStarted) {
              lines.push(line);
              line = '';
              lineWidth = wordWidth;
              lineJustStarted = true;
            }

            if (!lineJustStarted) {
              line += infix;
            }
            line += word;

            infixWidth = this._measureText(ctx, infix, lineIndex, offset);
            offset++;
            lineJustStarted = false;
            // keep track of largest word
            if (wordWidth > largestWordWidth) {
              largestWordWidth = wordWidth;
            }
          }

          i && lines.push(line);

          if (largestWordWidth > this.dynamicMinWidth) {
            this.dynamicMinWidth = largestWordWidth;
          }

          return lines;
        },
        /**
         * Gets lines of text to render in the Textbox. This function calculates
         * text wrapping on the fly everytime it is called.
         * @returns {Array} Array of lines in the Textbox.
         * @override
         */
        _splitTextIntoLines: function() {
          var originalAlign = this.textAlign;
          this.ctx.save();
          this._setTextStyles(this.ctx);
          this.textAlign = 'left';
          var lines = this._wrapText(this.ctx, this.text);
          this.textAlign = originalAlign;
          this.ctx.restore();
          this._textLines = lines;
          this._styleMap = this._generateStyleMap();
          return lines;
        },

        /**
         * When part of a group, we don't want the Textbox's scale to increase if
         * the group's increases. That's why we reduce the scale of the Textbox by
         * the amount that the group's increases. This is to maintain the effective
         * scale of the Textbox at 1, so that font-size values make sense. Otherwise
         * the same font-size value would result in different actual size depending
         * on the value of the scale.
         * @param {String} key
         * @param {Any} value
         */
        setOnGroup: function(key, value) {
          if (key === 'scaleX') {
            this.set('scaleX', Math.abs(1 / value));
            this.set('width', (this.get('width') * value) /
              (typeof this.__oldScaleX === 'undefined' ? 1 : this.__oldScaleX));
            this.__oldScaleX = value;
          }
        },

        /**
         * Returns 2d representation (lineIndex and charIndex) of cursor (or selection start).
         * Overrides the superclass function to take into account text wrapping.
         *
         * @param {Number} [selectionStart] Optional index. When not given, current selectionStart is used.
         */
        get2DCursorLocation: function(selectionStart) {
          if (typeof selectionStart === 'undefined') {
            selectionStart = this.selectionStart;
          }

          var numLines = this._textLines.length,
              removed  = 0;

          for (var i = 0; i < numLines; i++) {
            var line    = this._textLines[i],
                lineLen = line.length;

            if (selectionStart <= removed + lineLen) {
              return {
                lineIndex: i,
                charIndex: selectionStart - removed
              };
            }

            removed += lineLen;

            if (this.text[removed] === '\n' || this.text[removed] === ' ') {
              removed++;
            }
          }

          return {
            lineIndex: numLines - 1,
            charIndex: this._textLines[numLines - 1].length
          };
        },

        /**
         * Overrides superclass function and uses text wrapping data to get cursor
         * boundary offsets instead of the array of chars.
         * @param {Array} chars Unused
         * @param {String} typeOfBoundaries Can be 'cursor' or 'selection'
         * @returns {Object} Object with 'top', 'left', and 'lineLeft' properties set.
         */
        _getCursorBoundariesOffsets: function(chars, typeOfBoundaries) {
          var topOffset      = 0,
              leftOffset     = 0,
              cursorLocation = this.get2DCursorLocation(),
              lineChars      = this._textLines[cursorLocation.lineIndex].split(''),
              lineLeftOffset = this._getLineLeftOffset(this._getLineWidth(this.ctx, cursorLocation.lineIndex));

          for (var i = 0; i < cursorLocation.charIndex; i++) {
            leftOffset += this._getWidthOfChar(this.ctx, lineChars[i], cursorLocation.lineIndex, i);
          }

          for (i = 0; i < cursorLocation.lineIndex; i++) {
            topOffset += this._getHeightOfLine(this.ctx, i);
          }

          if (typeOfBoundaries === 'cursor') {
            topOffset += (1 - this._fontSizeFraction) * this._getHeightOfLine(this.ctx, cursorLocation.lineIndex)
              / this.lineHeight - this.getCurrentCharFontSize(cursorLocation.lineIndex, cursorLocation.charIndex)
              * (1 - this._fontSizeFraction);
          }

          return {
            top: topOffset,
            left: leftOffset,
            lineLeft: lineLeftOffset
          };
        },

        getMinWidth: function() {
          return Math.max(this.minWidth, this.dynamicMinWidth);
        },

        /**
         * Returns object representation of an instance
         * @method toObject
         * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
         * @return {Object} object representation of an instance
         */
        toObject: function(propertiesToInclude) {
          return fabric.util.object.extend(this.callSuper('toObject', propertiesToInclude), {
            minWidth: this.minWidth
          });
        }
      });
      /**
       * Returns fabric.Textbox instance from an object representation
       * @static
       * @memberOf fabric.Textbox
       * @param {Object} object Object to create an instance from
       * @return {fabric.Textbox} instance of fabric.Textbox
       */
      fabric.Textbox.fromObject = function(object) {
        return new fabric.Textbox(object.text, clone(object));
      };
      /**
       * Returns the default controls visibility required for Textboxes.
       * @returns {Object}
       */
      fabric.Textbox.getTextboxControlVisibility = function() {
        return {
          tl: false,
          tr: false,
          br: false,
          bl: false,
          ml: true,
          mt: false,
          mr: true,
          mb: false,
          mtr: true
        };
      };
      /**
       * Contains all fabric.Textbox objects that have been created
       * @static
       * @memberOf fabric.Textbox
       * @type Array
       */
      fabric.Textbox.instances = [];
    })(typeof exports !== 'undefined' ? exports : this);

    (function() {

      /**
       * Override _setObjectScale and add Textbox specific resizing behavior. Resizing
       * a Textbox doesn't scale text, it only changes width and makes text wrap automatically.
       */
      var setObjectScaleOverridden = fabric.Canvas.prototype._setObjectScale;

      fabric.Canvas.prototype._setObjectScale = function(localMouse, transform,
                                                         lockScalingX, lockScalingY, by, lockScalingFlip, _dim) {

        var t = transform.target;
        if (t instanceof fabric.Textbox) {
          var w = t.width * ((localMouse.x / transform.scaleX) / (t.width + t.strokeWidth));
          if (w >= t.getMinWidth()) {
            t.set('width', w);
            return true;
          }
        }
        else {
          return setObjectScaleOverridden.call(fabric.Canvas.prototype, localMouse, transform,
            lockScalingX, lockScalingY, by, lockScalingFlip, _dim);
        }
      };

      /**
       * Sets controls of this group to the Textbox's special configuration if
       * one is present in the group. Deletes _controlsVisibility otherwise, so that
       * it gets initialized to default value at runtime.
       */
      fabric.Group.prototype._refreshControlsVisibility = function() {
        if (typeof fabric.Textbox === 'undefined') {
          return;
        }
        for (var i = this._objects.length; i--;) {
          if (this._objects[i] instanceof fabric.Textbox) {
            this.setControlsVisibility(fabric.Textbox.getTextboxControlVisibility());
            return;
          }
        }
      };

      var clone = fabric.util.object.clone;

      fabric.util.object.extend(fabric.Textbox.prototype, /** @lends fabric.IText.prototype */ {
        /**
         * @private
         */
        _removeExtraneousStyles: function() {
          for (var prop in this._styleMap) {
            if (!this._textLines[prop]) {
              delete this.styles[this._styleMap[prop].line];
            }
          }
        },

        /**
         * Inserts style object for a given line/char index
         * @param {Number} lineIndex Index of a line
         * @param {Number} charIndex Index of a char
         * @param {Object} [style] Style object to insert, if given
         */
        insertCharStyleObject: function(lineIndex, charIndex, style) {
          // adjust lineIndex and charIndex
          var map = this._styleMap[lineIndex];
          lineIndex = map.line;
          charIndex = map.offset + charIndex;

          fabric.IText.prototype.insertCharStyleObject.apply(this, [lineIndex, charIndex, style]);
        },

        /**
         * Inserts new style object
         * @param {Number} lineIndex Index of a line
         * @param {Number} charIndex Index of a char
         * @param {Boolean} isEndOfLine True if it's end of line
         */
        insertNewlineStyleObject: function(lineIndex, charIndex, isEndOfLine) {
          // adjust lineIndex and charIndex
          var map = this._styleMap[lineIndex];
          lineIndex = map.line;
          charIndex = map.offset + charIndex;

          fabric.IText.prototype.insertNewlineStyleObject.apply(this, [lineIndex, charIndex, isEndOfLine]);
        },

        /**
         * Shifts line styles up or down. This function is slightly different than the one in
         * itext_behaviour as it takes into account the styleMap.
         *
         * @param {Number} lineIndex Index of a line
         * @param {Number} offset Can be -1 or +1
         */
        shiftLineStyles: function(lineIndex, offset) {
          // shift all line styles by 1 upward
          var clonedStyles = clone(this.styles),
              map          = this._styleMap[lineIndex];

          // adjust line index
          lineIndex = map.line;

          for (var line in this.styles) {
            var numericLine = parseInt(line, 10);

            if (numericLine > lineIndex) {
              this.styles[numericLine + offset] = clonedStyles[numericLine];

              if (!clonedStyles[numericLine - offset]) {
                delete this.styles[numericLine];
              }
            }
          }
          //TODO: evaluate if delete old style lines with offset -1
        },

        /**
         * Figure out programatically the text on previous actual line (actual = separated by \n);
         *
         * @param {Number} lIndex
         * @returns {String}
         * @private
         */
        _getTextOnPreviousLine: function(lIndex) {
          var textOnPreviousLine = this._textLines[lIndex - 1];

          while (this._styleMap[lIndex - 2] && this._styleMap[lIndex - 2].line === this._styleMap[lIndex - 1].line) {
            textOnPreviousLine = this._textLines[lIndex - 2] + textOnPreviousLine;

            lIndex--;
          }

          return textOnPreviousLine;
        },

        /**
         * Removes style object
         * @param {Boolean} isBeginningOfLine True if cursor is at the beginning of line
         * @param {Number} [index] Optional index. When not given, current selectionStart is used.
         */
        removeStyleObject: function(isBeginningOfLine, index) {

          var cursorLocation = this.get2DCursorLocation(index),
              map            = this._styleMap[cursorLocation.lineIndex],
              lineIndex      = map.line,
              charIndex      = map.offset + cursorLocation.charIndex;
          this._removeStyleObject(isBeginningOfLine, cursorLocation, lineIndex, charIndex);
        }
      });
    })();

    (function() {
      var override = fabric.IText.prototype._getNewSelectionStartFromOffset;
      /**
       * Overrides the IText implementation and adjusts character index as there is not always a linebreak
       *
       * @param {Number} mouseOffset
       * @param {Number} prevWidth
       * @param {Number} width
       * @param {Number} index
       * @param {Number} jlen
       * @returns {Number}
       */
      fabric.IText.prototype._getNewSelectionStartFromOffset = function(mouseOffset, prevWidth, width, index, jlen) {
        index = override.call(this, mouseOffset, prevWidth, width, index, jlen);

        // the index passed into the function is padded by the amount of lines from _textLines (to account for \n)
        // we need to remove this padding, and pad it by actual lines, and / or spaces that are meant to be there
        var tmp     = 0,
            removed = 0;

        // account for removed characters
        for (var i = 0; i < this._textLines.length; i++) {
          tmp += this._textLines[i].length;

          if (tmp + removed >= index) {
            break;
          }

          if (this.text[tmp + removed] === '\n' || this.text[tmp + removed] === ' ') {
            removed++;
          }
        }

        return index - i + removed;
      };
    })();

    (function() {

      Iif (typeof document !== 'undefined' && typeof window !== 'undefined') {
        return;
      }

      var DOMParser = require('xmldom').DOMParser,
          URL = require('url'),
          HTTP = require('http'),
          HTTPS = require('https'),

          Canvas = require('canvas'),
          Image = require('canvas').Image;

      /** @private */
      function request(url, encoding, callback) {
        var oURL = URL.parse(url);

        // detect if http or https is used
        Eif ( !oURL.port ) {
          oURL.port = ( oURL.protocol.indexOf('https:') === 0 ) ? 443 : 80;
        }

        // assign request handler based on protocol
        var reqHandler = (oURL.protocol.indexOf('https:') === 0 ) ? HTTPS : HTTP,
            req = reqHandler.request({
              hostname: oURL.hostname,
              port: oURL.port,
              path: oURL.path,
              method: 'GET'
            }, function(response) {
              var body = '';
              Eif (encoding) {
                response.setEncoding(encoding);
              }
              response.on('end', function () {
                callback(body);
              });
              response.on('data', function (chunk) {
                Iif (response.statusCode === 200) {
                  body += chunk;
                }
              });
            });

        req.on('error', function(err) {
          if (err.errno === process.ECONNREFUSED) {
            fabric.log('ECONNREFUSED: connection refused to ' + oURL.hostname + ':' + oURL.port);
          }
          else {
            fabric.log(err.message);
          }
          callback(null);
        });

        req.end();
      }

      /** @private */
      function requestFs(path, callback) {
        var fs = require('fs');
        fs.readFile(path, function (err, data) {
          Iif (err) {
            fabric.log(err);
            throw err;
          }
          else {
            callback(data);
          }
        });
      }

      fabric.util.loadImage = function(url, callback, context) {
        function createImageAndCallBack(data) {
          if (data) {
            img.src = new Buffer(data, 'binary');
            // preserving original url, which seems to be lost in node-canvas
            img._src = url;
            callback && callback.call(context, img);
          }
          else {
            img = null;
            callback && callback.call(context, null, true);
          }
        }
        var img = new Image();
        if (url && (url instanceof Buffer || url.indexOf('data') === 0)) {
          img.src = img._src = url;
          callback && callback.call(context, img);
        }
        else if (url && url.indexOf('http') !== 0) {
          requestFs(url, createImageAndCallBack);
        }
        else if (url) {
          request(url, 'binary', createImageAndCallBack);
        }
        else {
          callback && callback.call(context, url);
        }
      };

      fabric.loadSVGFromURL = function(url, callback, reviver) {
        url = url.replace(/^\n\s*/, '').replace(/\?.*$/, '').trim();
        if (url.indexOf('http') !== 0) {
          requestFs(url, function(body) {
            fabric.loadSVGFromString(body.toString(), callback, reviver);
          });
        }
        else {
          request(url, '', function(body) {
            fabric.loadSVGFromString(body, callback, reviver);
          });
        }
      };

      fabric.loadSVGFromString = function(string, callback, reviver) {
        var doc = new DOMParser().parseFromString(string);
        fabric.parseSVGDocument(doc.documentElement, function(results, options) {
          callback && callback(results, options);
        }, reviver);
      };

      fabric.util.getScript = function(url, callback) {
        request(url, '', function(body) {
          eval(body);
          callback && callback();
        });
      };

      fabric.Image.fromObject = function(object, callback) {
        fabric.util.loadImage(object.src, function(img) {
          var oImg = new fabric.Image(img);

          oImg._initConfig(object);
          oImg._initFilters(object.filters, function(filters) {
            oImg.filters = filters || [ ];
            oImg._initFilters(object.resizeFilters, function(resizeFilters) {
              oImg.resizeFilters = resizeFilters || [ ];
              callback && callback(oImg);
            });
          });
        });
      };
      /**
       * Only available when running fabric on node.js
       * @param {Number} width Canvas width
       * @param {Number} height Canvas height
       * @param {Object} [options] Options to pass to FabricCanvas.
       * @param {Object} [nodeCanvasOptions] Options to pass to NodeCanvas.
       * @return {Object} wrapped canvas instance
       */
      fabric.createCanvasForNode = function(width, height, options, nodeCanvasOptions) {
        nodeCanvasOptions = nodeCanvasOptions || options;

        var canvasEl = fabric.document.createElement('canvas'),
            nodeCanvas = new Canvas(width || 600, height || 600, nodeCanvasOptions);

        // jsdom doesn't create style on canvas element, so here be temp. workaround
        canvasEl.style = { };

        canvasEl.width = nodeCanvas.width;
        canvasEl.height = nodeCanvas.height;

        var FabricCanvas = fabric.Canvas || fabric.StaticCanvas,
            fabricCanvas = new FabricCanvas(canvasEl, options);

        fabricCanvas.contextContainer = nodeCanvas.getContext('2d');
        fabricCanvas.nodeCanvas = nodeCanvas;
        fabricCanvas.Font = Canvas.Font;

        return fabricCanvas;
      };

      /** @ignore */
      fabric.StaticCanvas.prototype.createPNGStream = function() {
        return this.nodeCanvas.createPNGStream();
      };

      fabric.StaticCanvas.prototype.createJPEGStream = function(opts) {
        return this.nodeCanvas.createJPEGStream(opts);
      };

      var origSetWidth = fabric.StaticCanvas.prototype.setWidth;
      fabric.StaticCanvas.prototype.setWidth = function(width, options) {
        origSetWidth.call(this, width, options);
        this.nodeCanvas.width = width;
        return this;
      };
      Eif (fabric.Canvas) {
        fabric.Canvas.prototype.setWidth = fabric.StaticCanvas.prototype.setWidth;
      }

      var origSetHeight = fabric.StaticCanvas.prototype.setHeight;
      fabric.StaticCanvas.prototype.setHeight = function(height, options) {
        origSetHeight.call(this, height, options);
        this.nodeCanvas.height = height;
        return this;
      };
      Eif (fabric.Canvas) {
        fabric.Canvas.prototype.setHeight = fabric.StaticCanvas.prototype.setHeight;
      }

    })();