(function(global) {

  'use strict';

  var fabric = global.fabric || (global.fabric = { }),
      extend = fabric.util.object.extend,
      clone = fabric.util.object.clone,
      toFixed = fabric.util.toFixed,
      capitalize = fabric.util.string.capitalize,
      degreesToRadians = fabric.util.degreesToRadians,
      supportsLineDash = fabric.StaticCanvas.supports('setLineDash'),
      objectCaching = !fabric.isLikelyNode;

  if (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 deselected
   * @fires modified
   * @fires rotating
   * @fires scaling
   * @fires moving
   * @fires skewing
   *
   * @fires mousedown
   * @fires mouseup
   * @fires mouseover
   * @fires mouseout
   * @fires mousewheel
   */
  fabric.Object = fabric.util.createClass(fabric.CommonMethods, /** @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.
     * @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,

    /**
     * When `true`, object is not exported in SVG or OBJECT/JSON
     * since 1.6.3
     * @type Boolean
     * @default
     */
    excludeFromExport:        false,

    /**
     * When `true`, object is cached on an additional canvas.
     * default to true
     * since 1.7.0
     * @type Boolean
     * @default true
     */
    objectCaching:            objectCaching,

    /**
     * When `true`, object properties are checked for cache invalidation. In some particular
     * situation you may want this to be disabled ( spray brush, very big pathgroups, groups)
     * or if your application does not allow you to modify properties for groups child you want
     * to disable it for groups.
     * default to false
     * since 1.7.0
     * @type Boolean
     * @default false
     */
    statefullCache:            false,

    /**
     * When `true`, cache does not get updated during scaling. The picture will get blocky if scaled
     * too much and will be redrawn with correct details at the end of scaling.
     * this setting is performance and application dependant.
     * default to true
     * since 1.7.0
     * @type Boolean
     * @default true
     */
    noScaleCache:              true,

    /**
     * When set to `true`, object's cache will be rerendered next render call.
     * since 1.7.0
     * @type Boolean
     * @default true
     */
    dirty:                true,

    /**
     * When set to `true`, force the object to have its own cache, even if it is inside a group
     * it may be needed when your object behave in a particular way on the cache and always needs
     * its own isolated canvas to render correctly.
     * since 1.7.5
     * @type Boolean
     * @default false
     */
    needsItsOwnCache: 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 ' +
      'skewX skewY'
    ).split(' '),

    /**
     * List of properties to consider when checking if cache needs refresh
     * @type Array
     */
    cacheProperties: (
      'fill stroke strokeWidth strokeDashArray width height stroke strokeWidth strokeDashArray' +
      ' strokeLineCap strokeLineJoin strokeMiterLimit fillRule backgroundColor'
    ).split(' '),

    /**
     * Constructor
     * @param {Object} [options] Options object
     */
    initialize: function(options) {
      options = options || { };
      if (options) {
        this.setOptions(options);
      }
      if (this.objectCaching) {
        this._createCacheCanvas();
      }
    },

    /**
     * Create a the canvas used to keep the cached copy of the object
     * @private
     */
    _createCacheCanvas: function() {
      this._cacheProperties = {};
      this._cacheCanvas = fabric.document.createElement('canvas');
      this._cacheContext = this._cacheCanvas.getContext('2d');
      this._updateCacheCanvas();
    },

    /**
     * Return the dimension and the zoom level needed to create a cache canvas
     * big enough to host the object to be cached.
     * @private
     * @return {Object}.width width of canvas
     * @return {Object}.height height of canvas
     * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache
     * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache
     */
    _getCacheCanvasDimensions: function() {
      var zoom = this.canvas && this.canvas.getZoom() || 1,
          objectScale = this.getObjectScaling(),
          dim = this._getNonTransformedDimensions(),
          retina = this.canvas && this.canvas._isRetinaScaling() ? fabric.devicePixelRatio : 1,
          zoomX = objectScale.scaleX * zoom * retina,
          zoomY = objectScale.scaleY * zoom * retina,
          width = dim.x * zoomX,
          height = dim.y * zoomY;
      return {
        width: width + 2,
        height: height + 2,
        zoomX: zoomX,
        zoomY: zoomY
      };
    },

    /**
     * Update width and height of the canvas for cache
     * returns true or false if canvas needed resize.
     * @private
     * @return {Boolean} true if the canvas has been resized
     */
    _updateCacheCanvas: function() {
      if (this.noScaleCache && this.canvas && this.canvas._currentTransform) {
        var action = this.canvas._currentTransform.action;
        if (action.slice(0, 5) === 'scale') {
          return false;
        }
      }
      var dims = this._getCacheCanvasDimensions(),
          width = dims.width, height = dims.height,
          zoomX = dims.zoomX, zoomY = dims.zoomY;

      if (width !== this.cacheWidth || height !== this.cacheHeight) {
        this._cacheCanvas.width = Math.ceil(width);
        this._cacheCanvas.height = Math.ceil(height);
        this._cacheContext.translate(width / 2, height / 2);
        this._cacheContext.scale(zoomX, zoomY);
        this.cacheWidth = width;
        this.cacheHeight = height;
        this.zoomX = zoomX;
        this.zoomY = zoomY;
        return true;
      }
      return false;
    },

    /**
     * Sets object's properties from options
     * @param {Object} [options] Options object
     */
    setOptions: function(options) {
      this._setOptions(options);
      this._initGradient(options.fill, 'fill');
      this._initGradient(options.stroke, 'stroke');
      this._initClipping(options);
      this._initPattern(options.fill, 'fill');
      this._initPattern(options.stroke, 'stroke');
    },

    /**
     * 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) {
      if (this.group && !this.group._transformDone && this.group === this.canvas._activeGroup) {
        this.group.transform(ctx);
      }
      var center = fromLeft ? this._getLeftTopCoords() : this.getCenterPoint();
      ctx.translate(center.x, center.y);
      this.angle && ctx.rotate(degreesToRadians(this.angle));
      ctx.scale(
        this.scaleX * (this.flipX ? -1 : 1),
        this.scaleY * (this.flipY ? -1 : 1)
      );
      this.skewX && ctx.transform(1, 0, Math.tan(degreesToRadians(this.skewX)), 1, 0, 0);
      this.skewY && 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() : null,
            skewX:                    toFixed(this.skewX, NUM_FRACTION_DIGITS),
            skewY:                    toFixed(this.skewY, NUM_FRACTION_DIGITS)
          };

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

      if (!this.includeDefaultValues) {
        object = this._removeDefaultValues(object);
      }

      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 [] === []
        if (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) + '>';
    },

    /**
     * Return the object scale factor counting also the group scaling
     * @return {Object} object with scaleX and scaleY properties
     */
    getObjectScaling: function() {
      var scaleX = this.scaleX, scaleY = this.scaleY;
      if (this.group) {
        var scaling = this.group.getObjectScaling();
        scaleX *= scaling.scaleX;
        scaleY *= scaling.scaleY;
      }
      return { scaleX: scaleX, scaleY: scaleY };
    },

    /**
     * @private
     * @param {String} key
     * @param {*} value
     * @return {fabric.Object} thisArg
     */
    _set: function(key, value) {
      var shouldConstrainValue = (key === 'scaleX' || key === 'scaleY');

      if (shouldConstrainValue) {
        value = this._constrainScale(value);
      }
      if (key === 'scaleX' && value < 0) {
        this.flipX = !this.flipX;
        value *= -1;
      }
      else if (key === 'scaleY' && value < 0) {
        this.flipY = !this.flipY;
        value *= -1;
      }
      else if (key === 'shadow' && value && !(value instanceof fabric.Shadow)) {
        value = new fabric.Shadow(value);
      }
      else if (key === 'dirty' && this.group) {
        this.group.set('dirty', value);
      }

      this[key] = value;

      if (this.cacheProperties.indexOf(key) > -1) {
        if (this.group) {
          this.group.set('dirty', true);
        }
        this.dirty = true;
      }

      if (this.group && this.stateProperties.indexOf(key) > -1) {
        this.group.set('dirty', true);
      }

      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.
    },

    /**
     * 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 fabric.iMatrix.concat();
    },

    /**
     * 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;
      }
      if (this.canvas && this.canvas.skipOffscreen && !this.group && !this.isOnScreen()) {
        return;
      }
      ctx.save();
      //setup fill rule for current object
      this._setupCompositeOperation(ctx);
      this.drawSelectionBackground(ctx);
      if (!noTransform) {
        this.transform(ctx);
      }
      this._setOpacity(ctx);
      this._setShadow(ctx);
      if (this.transformMatrix) {
        ctx.transform.apply(ctx, this.transformMatrix);
      }
      this.clipTo && fabric.util.clipContext(this, ctx);
      if (this.shouldCache()) {
        if (!this._cacheCanvas) {
          this._createCacheCanvas();
        }
        if (this.isCacheDirty(noTransform)) {
          this.statefullCache && this.saveState({ propertySet: 'cacheProperties' });
          this.drawObject(this._cacheContext, noTransform);
          this.dirty = false;
        }
        this.drawCacheOnCanvas(ctx);
      }
      else {
        this.drawObject(ctx, noTransform);
        if (noTransform && this.objectCaching && this.statefullCache) {
          this.saveState({ propertySet: 'cacheProperties' });
        }
      }
      this.clipTo && ctx.restore();
      ctx.restore();
    },

    /**
     * Decide if the object should cache or not.
     * objectCaching is a global flag, wins over everything
     * needsItsOwnCache should be used when the object drawing method requires
     * a cache step. None of the fabric classes requires it.
     * Generally you do not cache objects in groups because the group outside is cached.
     * @return {Boolean}
     */
    shouldCache: function() {
      return this.objectCaching &&
      (!this.group || this.needsItsOwnCache || !this.group.isCaching());
    },

    /**
     * Check if this object or a child object will cast a shadow
     * used by Group.shouldCache to know if child has a shadow recursively
     * @return {Boolean}
     */
    willDrawShadow: function() {
      return !!this.shadow;
    },

    /**
     * Execute the drawing operation for an object on a specified context
     * @param {CanvasRenderingContext2D} ctx Context to render on
     * @param {Boolean} [noTransform] When true, context is not transformed
     */
    drawObject: function(ctx, noTransform) {
      this._renderBackground(ctx);
      this._setStrokeStyles(ctx);
      this._setFillStyles(ctx);
      this._render(ctx, noTransform);
    },

    /**
     * Paint the cached copy of the object on the target context.
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    drawCacheOnCanvas: function(ctx) {
      ctx.scale(1 / this.zoomX, 1 / this.zoomY);
      ctx.drawImage(this._cacheCanvas, -this.cacheWidth / 2, -this.cacheHeight / 2);
    },

    /**
     * Check if cache is dirty
     * @param {Boolean} skipCanvas skip canvas checks because this object is painted
     * on parent canvas.
     */
    isCacheDirty: function(skipCanvas) {
      if (!skipCanvas && this._updateCacheCanvas()) {
        // in this case the context is already cleared.
        return true;
      }
      else {
        if (this.dirty || (this.statefullCache && this.hasStateChanged('cacheProperties'))) {
          if (!skipCanvas) {
            var width = this.cacheWidth / this.zoomX;
            var height = this.cacheHeight / this.zoomY;
            this._cacheContext.clearRect(-width / 2, -height / 2, width, height);
          }
          return true;
        }
      }
      return false;
    },

    /**
     * Draws a background for the object big as its untrasformed dimensions
     * @private
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    _renderBackground: function(ctx) {
      if (!this.backgroundColor) {
        return;
      }
      var dim = this._getNonTransformedDimensions();
      ctx.fillStyle = this.backgroundColor;

      ctx.fillRect(
        -dim.x / 2,
        -dim.y / 2,
        dim.x,
        dim.y
      );
      // if there is background color no other shadows
      // should be casted
      this._removeShadow(ctx);
    },

    /**
     * @private
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    _setOpacity: function(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) {
      if (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
      if (1 & dashArray.length) {
        dashArray.push.apply(dashArray, dashArray);
      }
      if (supportsLineDash) {
        ctx.setLineDash(dashArray);
      }
      else {
        alternative && alternative(ctx);
      }
    },

    /**
     * Renders controls and borders for the object
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    _renderControls: function(ctx) {
      if (!this.active || (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;
      if (!this.group) {
        ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;
      }
      if (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) {
      if (!this.shadow) {
        return;
      }

      var multX = (this.canvas && this.canvas.viewportTransform[0]) || 1,
          multY = (this.canvas && this.canvas.viewportTransform[3]) || 1,
          scaling = this.getObjectScaling();
      if (this.canvas && this.canvas._isRetinaScaling()) {
        multX *= fabric.devicePixelRatio;
        multY *= fabric.devicePixelRatio;
      }
      ctx.shadowColor = this.shadow.color;
      ctx.shadowBlur = this.shadow.blur * (multX + multY) * (scaling.scaleX + scaling.scaleY) / 4;
      ctx.shadowOffsetX = this.shadow.offsetX * multX * scaling.scaleX;
      ctx.shadowOffsetY = this.shadow.offsetY * multY * scaling.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
     * @param {Object} filler fabric.Pattern or fabric.Gradient
     */
    _applyPatternGradientTransform: function(ctx, filler) {
      if (!filler.toLive) {
        return;
      }
      var transform = filler.gradientTransform || filler.patternTransform;
      if (transform) {
        ctx.transform.apply(ctx, transform);
      }
      var offsetX = -this.width / 2 + filler.offsetX || 0,
          offsetY = -this.height / 2 + filler.offsetY || 0;
      ctx.translate(offsetX, offsetY);
    },

    /**
     * @private
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    _renderFill: function(ctx) {
      if (!this.fill) {
        return;
      }

      ctx.save();
      this._applyPatternGradientTransform(ctx, this.fill);
      if (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;
      }

      if (this.shadow && !this.shadow.affectStroke) {
        this._removeShadow(ctx);
      }

      ctx.save();
      this._setLineDash(ctx, this.strokeDashArray, this._renderDashedStroke);
      this._applyPatternGradientTransform(ctx, this.stroke);
      ctx.stroke();
      ctx.restore();
    },

    /**
     * Clones an instance, some objects are async, so using callback method will work for every object.
     * Using the direct return does not work for images and groups.
     * @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
     * @param {Object} [options] for clone as image, passed to toDataURL
     * @param {Boolean} [options.enableRetinaScaling] enable retina scaling for the cloned image
     * @return {fabric.Object} thisArg
     */
    cloneAsImage: function(callback, options) {
      var dataUrl = this.toDataURL(options);
      fabric.util.loadImage(dataUrl, function(img) {
        if (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
     * @param {Boolean} [options.enableRetina] Enable retina scaling for clone image. Introduce in 1.6.4
     * @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, { enableRetinaScaling: options.enableRetinaScaling });
      // to avoid common confusion https://github.com/kangax/fabric.js/issues/806
      if (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 (is 1 unless subclassed)
     */
    complexity: function() {
      return 1;
    },

    /**
     * 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
      };

      if (options.r1 || options.r2) {
        gradient.coords.r1 = options.r1;
        gradient.coords.r2 = options.r2;
      }

      gradient.gradientTransform = options.gradientTransform;
      fabric.Gradient.prototype.addColorStop.call(gradient, options.colorStops);

      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;

      if (shouldCenterOrigin) {
        this._setOriginToCenter();
      }

      this.set('angle', angle);

      if (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 && this.canvas.centerObjectH(this);
      return this;
    },

    /**
     * Centers object horizontally on current viewport of 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
     */
    viewportCenterH: function () {
      this.canvas && this.canvas.viewportCenterObjectH(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 && this.canvas.centerObjectV(this);
      return this;
    },

    /**
     * Centers object vertically on current viewport of 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
     */
    viewportCenterV: function () {
      this.canvas && this.canvas.viewportCenterObjectV(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 && this.canvas.centerObject(this);
      return this;
    },

    /**
     * Centers object on current viewport of 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
     */
    viewportCenter: function () {
      this.canvas && this.canvas.viewportCenterObject(this);
      return this;
    },

    /**
     * Removes object from canvas to which it was added last
     * @return {fabric.Object} thisArg
     * @chainable
     */
    remove: function() {
      this.canvas && 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, 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) {
      if (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;

  fabric.Object._fromObject = function(className, object, callback, forceAsync, extraParam) {
    var klass = fabric[className];
    object = clone(object, true);
    if (forceAsync) {
      fabric.util.enlivenPatterns([object.fill, object.stroke], function(patterns) {
        if (typeof patterns[0] !== 'undefined') {
          object.fill = patterns[0];
        }
        if (typeof patterns[1] !== 'undefined') {
          object.stroke = patterns[1];
        }
        var instance = extraParam ? new klass(object[extraParam], object) : new klass(object);
        callback && callback(instance);
      });
    }
    else {
      var instance = extraParam ? new klass(object[extraParam], object) : new klass(object);
      callback && callback(instance);
      return instance;
    }
  };

  /**
   * Unique id used internally when creating SVG elements
   * @static
   * @memberOf fabric.Object
   * @type Number
   */
  fabric.Object.__uid = 0;

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