#

API Docs for: 3.10.3
Show: Inherited Protected Private Deprecated

# File: graphics/js/CanvasShape.js

    /**
     * <a href="http://www.w3.org/TR/html5/the-canvas-element.html">Canvas</a> implementation of the <a href="Shape.html">`Shape`</a> class.
     * `CanvasShape` is not intended to be used directly. Instead, use the <a href="Shape.html">`Shape`</a> class.
     * If the browser lacks <a href="http://www.w3.org/TR/SVG/">SVG</a> capabilities but has
     * <a href="http://www.w3.org/TR/html5/the-canvas-element.html">Canvas</a> capabilities, the <a href="Shape.html">`Shape`</a>
     * class will point to the `CanvasShape` class.
     *
     * @module graphics
     * @class CanvasShape
     * @constructor
     */
    CanvasShape = function()
    {
        this._transforms = [];
        this.matrix = new Y.Matrix();
        CanvasShape.superclass.constructor.apply(this, arguments);
    };

    CanvasShape.NAME = "shape";

    Y.extend(CanvasShape, Y.GraphicBase, Y.mix({
        /**
         * Init method, invoked during construction.
         * Calls `initializer` method.
         *
         * @method init
         * @protected
         */
        init: function()
    	{
    		this.initializer.apply(this, arguments);
    	},

    	/**
    	 * Initializes the shape
    	 *
    	 * @private
    	 * @method _initialize
    	 */
    	initializer: function(cfg)
    	{
    		var host = this,
                graphic = cfg.graphic,
                data = this.get("data");
            host._initProps();
    		host.createNode();
    		host._xcoords = [0];
    		host._ycoords = [0];
            if(graphic)
            {
                this._setGraphic(graphic);
            }
            if(data)
            {
                host._parsePathData(data);
            }
    		host._updateHandler();
    	},

        /**
         * Set the Graphic instance for the shape.
         *
         * @method _setGraphic
         * @param {Graphic | Node | HTMLElement | String} render This param is used to determine the graphic instance. If it is a
         * `Graphic` instance, it will be assigned to the `graphic` attribute. Otherwise, a new Graphic instance will be created
         * and rendered into the dom element that the render represents.
         * @private
         */
        _setGraphic: function(render)
        {
            var graphic;
            if(render instanceof Y.CanvasGraphic)
            {
                this._graphic = render;
            }
            else
            {
                render = Y.one(render);
                graphic = new Y.CanvasGraphic({
                    render: render
                });
                graphic._appendShape(this);
                this._graphic = graphic;
            }
        },

    	/**
    	 * Add a class name to each node.
    	 *
    	 * @method addClass
    	 * @param {String} className the class name to add to the node's class attribute
    	 */
    	addClass: function(className)
    	{
    		var node = Y.one(this.get("node"));
    		node.addClass(className);
    	},

    	/**
    	 * Removes a class name from each node.
    	 *
    	 * @method removeClass
    	 * @param {String} className the class name to remove from the node's class attribute
    	 */
    	removeClass: function(className)
    	{
    		var node = Y.one(this.get("node"));
    		node.removeClass(className);
    	},

    	/**
    	 * Gets the current position of the node in page coordinates.
    	 *
    	 * @method getXY
    	 * @return Array The XY position of the shape.
    	 */
    	getXY: function()
    	{
    		var graphic = this.get("graphic"),
    			parentXY = graphic.getXY(),
    			x = this.get("x"),
    			y = this.get("y");
    		return [parentXY[0] + x, parentXY[1] + y];
    	},

    	/**
    	 * Set the position of the shape in page coordinates, regardless of how the node is positioned.
    	 *
    	 * @method setXY
    	 * @param {Array} Contains X & Y values for new position (coordinates are page-based)
    	 */
    	setXY: function(xy)
    	{
    		var graphic = this.get("graphic"),
    			parentXY = graphic.getXY(),
    			x = xy[0] - parentXY[0],
    			y = xy[1] - parentXY[1];
    		this._set("x", x);
    		this._set("y", y);
    		this._updateNodePosition(x, y);
    	},

    	/**
    	 * Determines whether the node is an ancestor of another HTML element in the DOM hierarchy.
    	 *
    	 * @method contains
    	 * @param {CanvasShape | HTMLElement} needle The possible node or descendent
    	 * @return Boolean Whether or not this shape is the needle or its ancestor.
    	 */
    	contains: function(needle)
    	{
    		return needle === Y.one(this.node);
    	},

    	/**
    	 * Test if the supplied node matches the supplied selector.
    	 *
    	 * @method test
    	 * @param {String} selector The CSS selector to test against.
    	 * @return Boolean Wheter or not the shape matches the selector.
    	 */
    	test: function(selector)
    	{
    		return Y.one(this.get("node")).test(selector);
    		//return Y.Selector.test(this.node, selector);
    	},

    	/**
    	 * Compares nodes to determine if they match.
    	 * Node instances can be compared to each other and/or HTMLElements.
    	 * @method compareTo
    	 * @param {HTMLElement | Node} refNode The reference node to compare to the node.
    	 * @return {Boolean} True if the nodes match, false if they do not.
    	 */
    	compareTo: function(refNode) {
    		var node = this.node;
    		return node === refNode;
    	},

    	/**
    	 * Value function for fill attribute
    	 *
    	 * @method _getDefaultFill
    	 * @return Object
    	 * @private
    	 */
    	_getDefaultFill: function() {
    		return {
    			type: "solid",
    			opacity: 1,
    			cx: 0.5,
    			cy: 0.5,
    			fx: 0.5,
    			fy: 0.5,
    			r: 0.5
    		};
    	},

    	/**
    	 * Value function for stroke attribute
    	 *
    	 * @method _getDefaultStroke
    	 * @return Object
    	 * @private
    	 */
    	_getDefaultStroke: function()
    	{
    		return {
    			weight: 1,
    			dashstyle: "none",
    			color: "#000",
    			opacity: 1.0
    		};
    	},

    	/**
    	 * Left edge of the path
    	 *
         * @property _left
         * @type Number
    	 * @private
    	 */
    	_left: 0,

    	/**
    	 * Right edge of the path
    	 *
         * @property _right
         * @type Number
    	 * @private
    	 */
    	_right: 0,

    	/**
    	 * Top edge of the path
    	 *
         * @property _top
         * @type Number
    	 * @private
    	 */
    	_top: 0,

    	/**
    	 * Bottom edge of the path
    	 *
         * @property _bottom
         * @type Number
    	 * @private
    	 */
    	_bottom: 0,

    	/**
    	 * Creates the dom node for the shape.
    	 *
         * @method createNode
    	 * @return HTMLElement
    	 * @private
    	 */
    	createNode: function()
    	{
    		var host = this,
                node = Y.config.doc.createElement('canvas'),
    			id = host.get("id"),
                concat = host._camelCaseConcat,
                name = host.name;
    		host._context = node.getContext('2d');
    		node.setAttribute("overflow", "visible");
            node.style.overflow = "visible";
            if(!host.get("visible"))
            {
                node.style.visibility = "hidden";
            }
    		node.setAttribute("id", id);
    		id = "#" + id;
            host.node = node;
    		host.addClass(
                _getClassName(SHAPE) +
                " " +
                _getClassName(concat(IMPLEMENTATION, SHAPE)) +
                " " +
                _getClassName(name) +
                " " +
                _getClassName(concat(IMPLEMENTATION, name))
            );
    	},

    	/**
         * Overrides default `on` method. Checks to see if its a dom interaction event. If so,
         * return an event attached to the `node` element. If not, return the normal functionality.
         *
         * @method on
         * @param {String} type event type
         * @param {Object} callback function
    	 * @private
    	 */
    	on: function(type, fn)
    	{
    		if(Y.Node.DOM_EVENTS[type])
    		{
    			return Y.one("#" +  this.get("id")).on(type, fn);
    		}
    		return Y.on.apply(this, arguments);
    	},

    	/**
    	 * Adds a stroke to the shape node.
    	 *
    	 * @method _strokeChangeHandler
         * @param {Object} stroke Properties of the `stroke` attribute.
    	 * @private
    	 */
    	_setStrokeProps: function(stroke)
    	{
    		var color,
    			weight,
    			opacity,
    			linejoin,
    			linecap,
    			dashstyle;
            if(stroke)
            {
                color = stroke.color;
                weight = PARSE_FLOAT(stroke.weight);
                opacity = PARSE_FLOAT(stroke.opacity);
                linejoin = stroke.linejoin || "round";
                linecap = stroke.linecap || "butt";
                dashstyle = stroke.dashstyle;
                this._miterlimit = null;
                this._dashstyle = (dashstyle && Y.Lang.isArray(dashstyle) && dashstyle.length > 1) ? dashstyle : null;
                this._strokeWeight = weight;

                if (IS_NUMBER(weight) && weight > 0)
                {
                    this._stroke = 1;
                }
                else
                {
                    this._stroke = 0;
                }
                if (IS_NUMBER(opacity)) {
                    this._strokeStyle = this._toRGBA(color, opacity);
                }
                else
                {
                    this._strokeStyle = color;
                }
                this._linecap = linecap;
                if(linejoin === "round" || linejoin === "bevel")
                {
                    this._linejoin = linejoin;
                }
                else
                {
                    linejoin = parseInt(linejoin, 10);
                    if(IS_NUMBER(linejoin))
                    {
                        this._miterlimit =  Math.max(linejoin, 1);
                        this._linejoin = "miter";
                    }
                }
            }
            else
            {
                this._stroke = 0;
            }
    	},

        /**
         * Sets the value of an attribute.
         *
         * @method set
         * @param {String|Object} name The name of the attribute. Alternatively, an object of key value pairs can
         * be passed in to set multiple attributes at once.
         * @param {Any} value The value to set the attribute to. This value is ignored if an object is received as
         * the name param.
         */
    	set: function()
    	{
    		var host = this;
    		AttributeLite.prototype.set.apply(host, arguments);
    		if(host.initialized)
    		{
    			host._updateHandler();
    		}
    	},

    	/**
    	 * Adds a fill to the shape node.
    	 *
    	 * @method _setFillProps
         * @param {Object} fill Properties of the `fill` attribute.
    	 * @private
    	 */
    	_setFillProps: function(fill)
    	{
    		var isNumber = IS_NUMBER,
    			color,
    			opacity,
    			type;
            if(fill)
            {
                color = fill.color;
                type = fill.type;
                if(type === "linear" || type === "radial")
                {
                    this._fillType = type;
                }
                else if(color)
                {
                    opacity = fill.opacity;
                    if (isNumber(opacity))
                    {
                        opacity = Math.max(0, Math.min(1, opacity));
                        color = this._toRGBA(color, opacity);
                    }
                    else
                    {
                        color = TORGB(color);
                    }

                    this._fillColor = color;
                    this._fillType = 'solid';
                }
                else
                {
                    this._fillColor = null;
                }
            }
    		else
    		{
                this._fillType = null;
    			this._fillColor = null;
    		}
    	},

    	/**
    	 * Specifies a 2d translation.
    	 *
    	 * @method translate
    	 * @param {Number} x The value to transate on the x-axis.
    	 * @param {Number} y The value to translate on the y-axis.
    	 */
    	translate: function(x, y)
    	{
    		this._translateX += x;
    		this._translateY += y;
    		this._addTransform("translate", arguments);
    	},

    	/**
    	 * Translates the shape along the x-axis. When translating x and y coordinates,
    	 * use the `translate` method.
    	 *
    	 * @method translateX
    	 * @param {Number} x The value to translate.
    	 */
    	translateX: function(x)
        {
            this._translateX += x;
            this._addTransform("translateX", arguments);
        },

    	/**
    	 * Performs a translate on the y-coordinate. When translating x and y coordinates,
    	 * use the `translate` method.
    	 *
    	 * @method translateY
    	 * @param {Number} y The value to translate.
    	 */
    	translateY: function(y)
        {
            this._translateY += y;
            this._addTransform("translateY", arguments);
        },

        /**
         * Skews the shape around the x-axis and y-axis.
         *
         * @method skew
         * @param {Number} x The value to skew on the x-axis.
         * @param {Number} y The value to skew on the y-axis.
         */
        skew: function()
        {
            this._addTransform("skew", arguments);
        },

    	/**
    	 * Skews the shape around the x-axis.
    	 *
    	 * @method skewX
    	 * @param {Number} x x-coordinate
    	 */
        skewX: function()
        {
            this._addTransform("skewX", arguments);
        },

    	/**
    	 * Skews the shape around the y-axis.
    	 *
    	 * @method skewY
    	 * @param {Number} y y-coordinate
    	 */
        skewY: function()
        {
            this._addTransform("skewY", arguments);
        },

    	/**
    	 * Rotates the shape clockwise around it transformOrigin.
    	 *
    	 * @method rotate
    	 * @param {Number} deg The degree of the rotation.
    	 */
        rotate: function()
        {
            this._addTransform("rotate", arguments);
        },

    	/**
    	 * Specifies a 2d scaling operation.
    	 *
    	 * @method scale
    	 * @param {Number} val
    	 */
        scale: function()
        {
            this._addTransform("scale", arguments);
        },

        /**
         * Storage for the transform attribute.
         *
         * @property _transform
         * @type String
         * @private
         */
        _transform: "",

        /**
         * Adds a transform to the shape.
         *
         * @method _addTransform
         * @param {String} type The transform being applied.
         * @param {Array} args The arguments for the transform.
    	 * @private
    	 */
    	_addTransform: function(type, args)
    	{
            args = Y.Array(args);
            this._transform = Y_LANG.trim(this._transform + " " + type + "(" + args.join(", ") + ")");
            args.unshift(type);
            this._transforms.push(args);
            if(this.initialized)
            {
                this._updateTransform();
            }
    	},

    	/**
         * Applies all transforms.
         *
         * @method _updateTransform
    	 * @private
    	 */
    	_updateTransform: function()
    	{
    		var node = this.node,
    			key,
    			transform,
    			transformOrigin = this.get("transformOrigin"),
                matrix = this.matrix,
                i,
                len = this._transforms.length;

            if(this._transforms && this._transforms.length > 0)
            {
                for(i = 0; i < len; ++i)
                {
                    key = this._transforms[i].shift();
                    if(key)
                    {
                        matrix[key].apply(matrix, this._transforms[i]);
                    }
                }
                transform = matrix.toCSSText();
            }

            this._graphic.addToRedrawQueue(this);
    		transformOrigin = (100 * transformOrigin[0]) + "% " + (100 * transformOrigin[1]) + "%";
            Y_DOM.setStyle(node, "transformOrigin", transformOrigin);
            if(transform)
    		{
                Y_DOM.setStyle(node, "transform", transform);
    		}
            this._transforms = [];
    	},

    	/**
         * Updates `Shape` based on attribute changes.
         *
         * @method _updateHandler
    	 * @private
    	 */
    	_updateHandler: function()
    	{
    		this._draw();
    		this._updateTransform();
    	},

    	/**
    	 * Updates the shape.
    	 *
    	 * @method _draw
    	 * @private
    	 */
    	_draw: function()
    	{
            var node = this.node;
            this.clear();
    		this._closePath();
    		node.style.left = this.get("x") + "px";
    		node.style.top = this.get("y") + "px";
    	},

    	/**
    	 * Completes a shape or drawing
    	 *
    	 * @method _closePath
    	 * @private
    	 */
    	_closePath: function()
    	{
    		if(!this._methods)
    		{
    			return;
    		}
    		var node = this.get("node"),
    			w = this._right - this._left,
    			h = this._bottom - this._top,
    			context = this._context,
    			methods = [],
    			cachedMethods = this._methods.concat(),
    			i,
    			j,
    			method,
    			args,
                argsLen,
    			len = 0;
    		this._context.clearRect(0, 0, node.width, node.height);
            if(this._methods)
            {
    			len = cachedMethods.length;
    			if(!len || len < 1)
    			{
    				return;
    			}
    			for(i = 0; i < len; ++i)
    			{
    				methods[i] = cachedMethods[i].concat();
    				args = methods[i];
                    argsLen = (args[0] === "quadraticCurveTo" || args[0] === "bezierCurveTo") ? args.length : 3;
    				for(j = 1; j < argsLen; ++j)
    				{
    					if(j % 2 === 0)
    					{
    						args[j] = args[j] - this._top;
    					}
    					else
    					{
    						args[j] = args[j] - this._left;
    					}
    				}
    			}
                node.setAttribute("width", Math.min(w, 2000));
                node.setAttribute("height", Math.min(2000, h));
                context.beginPath();
    			for(i = 0; i < len; ++i)
    			{
    				args = methods[i].concat();
    				if(args && args.length > 0)
    				{
    					method = args.shift();
    					if(method)
    					{
                            if(method === "closePath")
                            {
                                context.closePath();
                                this._strokeAndFill(context);
                            }
    						else if(method && method === "lineTo" && this._dashstyle)
    						{
    							args.unshift(this._xcoords[i] - this._left, this._ycoords[i] - this._top);
    							this._drawDashedLine.apply(this, args);
    						}
    						else
    						{
                                context[method].apply(context, args);
    						}
    					}
    				}
    			}

                this._strokeAndFill(context);
    			this._drawingComplete = true;
    			this._clearAndUpdateCoords();
    			this._updateNodePosition();
    			this._methods = cachedMethods;
    		}
    	},

        /**
         * Completes a stroke and/or fill operation on the context.
         *
         * @method _strokeAndFill
         * @param {Context} Reference to the context element of the canvas instance.
         * @private
         */
        _strokeAndFill: function(context)
        {
            if (this._fillType)
            {
                if(this._fillType === "linear")
                {
                    context.fillStyle = this._getLinearGradient();
                }
                else if(this._fillType === "radial")
                {
                    context.fillStyle = this._getRadialGradient();
                }
                else
                {
                    context.fillStyle = this._fillColor;
                }
                context.closePath();
                context.fill();
            }

            if (this._stroke) {
                if(this._strokeWeight)
                {
                    context.lineWidth = this._strokeWeight;
                }
                context.lineCap = this._linecap;
                context.lineJoin = this._linejoin;
                if(this._miterlimit)
                {
                    context.miterLimit = this._miterlimit;
                }
                context.strokeStyle = this._strokeStyle;
                context.stroke();
            }
        },

    	/**
    	 * Draws a dashed line between two points.
    	 *
    	 * @method _drawDashedLine
    	 * @param {Number} xStart	The x position of the start of the line
    	 * @param {Number} yStart	The y position of the start of the line
    	 * @param {Number} xEnd		The x position of the end of the line
    	 * @param {Number} yEnd		The y position of the end of the line
    	 * @private
    	 */
    	_drawDashedLine: function(xStart, yStart, xEnd, yEnd)
    	{
    		var context = this._context,
    			dashsize = this._dashstyle[0],
    			gapsize = this._dashstyle[1],
    			segmentLength = dashsize + gapsize,
    			xDelta = xEnd - xStart,
    			yDelta = yEnd - yStart,
    			delta = Math.sqrt(Math.pow(xDelta, 2) + Math.pow(yDelta, 2)),
    			segmentCount = Math.floor(Math.abs(delta / segmentLength)),
    			radians = Math.atan2(yDelta, xDelta),
    			xCurrent = xStart,
    			yCurrent = yStart,
    			i;
    		xDelta = Math.cos(radians) * segmentLength;
    		yDelta = Math.sin(radians) * segmentLength;

    		for(i = 0; i < segmentCount; ++i)
    		{
    			context.moveTo(xCurrent, yCurrent);
    			context.lineTo(xCurrent + Math.cos(radians) * dashsize, yCurrent + Math.sin(radians) * dashsize);
    			xCurrent += xDelta;
    			yCurrent += yDelta;
    		}

    		context.moveTo(xCurrent, yCurrent);
    		delta = Math.sqrt((xEnd - xCurrent) * (xEnd - xCurrent) + (yEnd - yCurrent) * (yEnd - yCurrent));

    		if(delta > dashsize)
    		{
    			context.lineTo(xCurrent + Math.cos(radians) * dashsize, yCurrent + Math.sin(radians) * dashsize);
    		}
    		else if(delta > 0)
    		{
    			context.lineTo(xCurrent + Math.cos(radians) * delta, yCurrent + Math.sin(radians) * delta);
    		}

    		context.moveTo(xEnd, yEnd);
    	},

    	/**
    	 * Returns the bounds for a shape.
    	 *
         * Calculates the a new bounding box from the original corner coordinates (base on size and position) and the transform matrix.
         * The calculated bounding box is used by the graphic instance to calculate its viewBox.
         *
    	 * @method getBounds
    	 * @return Object
    	 */
    	getBounds: function()
    	{
    		var type = this._type,
    			w = this.get("width"),
    			h = this.get("height"),
    			x = this.get("x"),
    			y = this.get("y");
            if(type === "path")
            {
                x = x + this._left;
                y = y + this._top;
                w = this._right - this._left;
                h = this._bottom - this._top;
            }
            return this._getContentRect(w, h, x, y);
    	},

        /**
         * Calculates the bounding box for the shape.
         *
         * @method _getContentRect
         * @param {Number} w width of the shape
         * @param {Number} h height of the shape
         * @param {Number} x x-coordinate of the shape
         * @param {Number} y y-coordinate of the shape
         * @private
         */
        _getContentRect: function(w, h, x, y)
        {
            var transformOrigin = this.get("transformOrigin"),
                transformX = transformOrigin[0] * w,
                transformY = transformOrigin[1] * h,
                transforms = this.matrix.getTransformArray(this.get("transform")),
                matrix = new Y.Matrix(),
                i,
                len = transforms.length,
                transform,
                key,
                contentRect;
            if(this._type === "path")
            {
                transformX = transformX + x;
                transformY = transformY + y;
            }
            transformX = !isNaN(transformX) ? transformX : 0;
            transformY = !isNaN(transformY) ? transformY : 0;
            matrix.translate(transformX, transformY);
            for(i = 0; i < len; i = i + 1)
            {
                transform = transforms[i];
                key = transform.shift();
                if(key)
                {
                    matrix[key].apply(matrix, transform);
                }
            }
            matrix.translate(-transformX, -transformY);
            contentRect = matrix.getContentRect(w, h, x, y);
            return contentRect;
        },

        /**
         * Places the shape above all other shapes.
         *
         * @method toFront
         */
        toFront: function()
        {
            var graphic = this.get("graphic");
            if(graphic)
            {
                graphic._toFront(this);
            }
        },

        /**
         * Places the shape underneath all other shapes.
         *
         * @method toFront
         */
        toBack: function()
        {
            var graphic = this.get("graphic");
            if(graphic)
            {
                graphic._toBack(this);
            }
        },

        /**
         * Parses path data string and call mapped methods.
         *
         * @method _parsePathData
         * @param {String} val The path data
         * @private
         */
        _parsePathData: function(val)
        {
            var method,
                methodSymbol,
                args,
                commandArray = Y.Lang.trim(val.match(SPLITPATHPATTERN)),
                i,
                len,
                str,
                symbolToMethod = this._pathSymbolToMethod;
            if(commandArray)
            {
                this.clear();
                len = commandArray.length || 0;
                for(i = 0; i < len; i = i + 1)
                {
                    str = commandArray[i];
                    methodSymbol = str.substr(0, 1);
                    args = str.substr(1).match(SPLITARGSPATTERN);
                    method = symbolToMethod[methodSymbol];
                    if(method)
                    {
                        if(args)
                        {
                            this[method].apply(this, args);
                        }
                        else
                        {
                            this[method].apply(this);
                        }
                    }
                }
                this.end();
            }
        },

        /**
         * Destroys the shape instance.
         *
         * @method destroy
         */
        destroy: function()
        {
            var graphic = this.get("graphic");
            if(graphic)
            {
                graphic.removeShape(this);
            }
            else
            {
                this._destroy();
            }
        },

        /**
         *  Implementation for shape destruction
         *
         *  @method destroy
         *  @protected
         */
        _destroy: function()
        {
            if(this.node)
            {
                Y.one(this.node).remove(true);
                this._context = null;
                this.node = null;
            }
        }
    }, Y.CanvasDrawing.prototype));

    CanvasShape.ATTRS =  {
    	/**
    	 * An array of x, y values which indicates the transformOrigin in which to rotate the shape. Valid values range between 0 and 1 representing a
    	 * fraction of the shape's corresponding bounding box dimension. The default value is [0.5, 0.5].
    	 *
    	 * @config transformOrigin
    	 * @type Array
    	 */
    	transformOrigin: {
    		valueFn: function()
    		{
    			return [0.5, 0.5];
    		}
    	},

        /**
         * <p>A string containing, in order, transform operations applied to the shape instance. The `transform` string can contain the following values:
         *
         *    <dl>
         *        <dt>rotate</dt><dd>Rotates the shape clockwise around it transformOrigin.</dd>
         *        <dt>translate</dt><dd>Specifies a 2d translation.</dd>
         *        <dt>skew</dt><dd>Skews the shape around the x-axis and y-axis.</dd>
         *        <dt>scale</dt><dd>Specifies a 2d scaling operation.</dd>
         *        <dt>translateX</dt><dd>Translates the shape along the x-axis.</dd>
         *        <dt>translateY</dt><dd>Translates the shape along the y-axis.</dd>
         *        <dt>skewX</dt><dd>Skews the shape around the x-axis.</dd>
         *        <dt>skewY</dt><dd>Skews the shape around the y-axis.</dd>
         *        <dt>matrix</dt><dd>Specifies a 2D transformation matrix comprised of the specified six values.</dd>
         *    </dl>
         * </p>
         * <p>Applying transforms through the transform attribute will reset the transform matrix and apply a new transform. The shape class also contains
         * corresponding methods for each transform that will apply the transform to the current matrix. The below code illustrates how you might use the
         * `transform` attribute to instantiate a recangle with a rotation of 45 degrees.</p>
                var myRect = new Y.Rect({
                    type:"rect",
                    width: 50,
                    height: 40,
                    transform: "rotate(45)"
                };
         * <p>The code below would apply `translate` and `rotate` to an existing shape.</p>

            myRect.set("transform", "translate(40, 50) rotate(45)");
    	 * @config transform
         * @type String
    	 */
    	transform: {
    		setter: function(val)
    		{
                this.matrix.init();
                this._transforms = this.matrix.getTransformArray(val);
                this._transform = val;
                return val;
    		},

            getter: function()
            {
                return this._transform;
            }
    	},

    	/**
    	 * Dom node for the shape
    	 *
    	 * @config node
    	 * @type HTMLElement
    	 * @readOnly
    	 */
    	node: {
    		readOnly: true,

    		getter: function()
    		{
    			return this.node;
    		}
    	},

    	/**
    	 * Unique id for class instance.
    	 *
    	 * @config id
    	 * @type String
    	 */
    	id: {
    		valueFn: function()
    		{
    			return Y.guid();
    		},

    		setter: function(val)
    		{
    			var node = this.node;
    			if(node)
    			{
    				node.setAttribute("id", val);
    			}
    			return val;
    		}
    	},

    	/**
    	 * Indicates the width of the shape
    	 *
    	 * @config width
    	 * @type Number
    	 */
    	width: {
            value: 0
        },

    	/**
    	 * Indicates the height of the shape
    	 *
    	 * @config height
    	 * @type Number
    	 */
    	height: {
            value: 0
        },

    	/**
    	 * Indicates the x position of shape.
    	 *
    	 * @config x
    	 * @type Number
    	 */
    	x: {
    		value: 0
    	},

    	/**
    	 * Indicates the y position of shape.
    	 *
    	 * @config y
    	 * @type Number
    	 */
    	y: {
    		value: 0
    	},

    	/**
    	 * Indicates whether the shape is visible.
    	 *
    	 * @config visible
    	 * @type Boolean
    	 */
    	visible: {
    		value: true,

    		setter: function(val){
    			var node = this.get("node"),
                    visibility = val ? "visible" : "hidden";
    			if(node)
                {
                    node.style.visibility = visibility;
                }
    			return val;
    		}
    	},

    	/**
    	 * Contains information about the fill of the shape.
         *  <dl>
         *      <dt>color</dt><dd>The color of the fill.</dd>
         *      <dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the fill. The default value is 1.</dd>
         *      <dt>type</dt><dd>Type of fill.
         *          <dl>
         *              <dt>solid</dt><dd>Solid single color fill. (default)</dd>
         *              <dt>linear</dt><dd>Linear gradient fill.</dd>
         *              <dt>radial</dt><dd>Radial gradient fill.</dd>
         *          </dl>
         *      </dd>
         *  </dl>
         *  <p>If a `linear` or `radial` is specified as the fill type. The following additional property is used:
         *  <dl>
         *      <dt>stops</dt><dd>An array of objects containing the following properties:
         *          <dl>
         *              <dt>color</dt><dd>The color of the stop.</dd>
         *              <dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the stop. The default value is 1.
         *              Note: No effect for IE 6 - 8</dd>
         *              <dt>offset</dt><dd>Number between 0 and 1 indicating where the color stop is positioned.</dd>
         *          </dl>
         *      </dd>
         *      <p>Linear gradients also have the following property:</p>
         *      <dt>rotation</dt><dd>Linear gradients flow left to right by default. The rotation property allows you to change the
         *      flow by rotation. (e.g. A rotation of 180 would make the gradient pain from right to left.)</dd>
         *      <p>Radial gradients have the following additional properties:</p>
         *      <dt>r</dt><dd>Radius of the gradient circle.</dd>
         *      <dt>fx</dt><dd>Focal point x-coordinate of the gradient.</dd>
         *      <dt>fy</dt><dd>Focal point y-coordinate of the gradient.</dd>
         *  </dl>
         *  <p>The corresponding `SVGShape` class implements the following additional properties.</p>
         *  <dl>
         *      <dt>cx</dt><dd>
         *          <p>The x-coordinate of the center of the gradient circle. Determines where the color stop begins. The default value 0.5.</p>
         *          <p><strong>Note: </strong>Currently, this property is not implemented for corresponding `CanvasShape` and
         *          `VMLShape` classes which are used on Android or IE 6 - 8.</p>
         *      </dd>
         *      <dt>cy</dt><dd>
         *          <p>The y-coordinate of the center of the gradient circle. Determines where the color stop begins. The default value 0.5.</p>
         *          <p><strong>Note: </strong>Currently, this property is not implemented for corresponding `CanvasShape` and `VMLShape`
         *          classes which are used on Android or IE 6 - 8.</p>
         *      </dd>
         *  </dl>
         *  <p>These properties are not currently implemented in `CanvasShape` or `VMLShape`.</p>
    	 *
    	 * @config fill
    	 * @type Object
    	 */
    	fill: {
    		valueFn: "_getDefaultFill",

    		setter: function(val)
    		{
    			var fill,
    				tmpl = this.get("fill") || this._getDefaultFill();
    			fill = (val) ? Y.merge(tmpl, val) : null;
    			if(fill && fill.color)
    			{
    				if(fill.color === undefined || fill.color === "none")
    				{
    					fill.color = null;
    				}
    			}
    			this._setFillProps(fill);
    			return fill;
    		}
    	},

    	/**
    	 * Contains information about the stroke of the shape.
         *  <dl>
         *      <dt>color</dt><dd>The color of the stroke.</dd>
         *      <dt>weight</dt><dd>Number that indicates the width of the stroke.</dd>
         *      <dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the stroke. The default value is 1.</dd>
         *      <dt>dashstyle</dt>Indicates whether to draw a dashed stroke. When set to "none", a solid stroke is drawn. When set
         *      to an array, the first index indicates the length of the dash. The second index indicates the length of gap.
         *      <dt>linecap</dt><dd>Specifies the linecap for the stroke. The following values can be specified:
         *          <dl>
         *              <dt>butt (default)</dt><dd>Specifies a butt linecap.</dd>
         *              <dt>square</dt><dd>Specifies a sqare linecap.</dd>
         *              <dt>round</dt><dd>Specifies a round linecap.</dd>
         *          </dl>
         *      </dd>
         *      <dt>linejoin</dt><dd>Specifies a linejoin for the stroke. The following values can be specified:
         *          <dl>
         *              <dt>round (default)</dt><dd>Specifies that the linejoin will be round.</dd>
         *              <dt>bevel</dt><dd>Specifies a bevel for the linejoin.</dd>
         *              <dt>miter limit</dt><dd>An integer specifying the miter limit of a miter linejoin. If you want to specify a linejoin
         *              of miter, you simply specify the limit as opposed to having separate miter and miter limit values.</dd>
         *          </dl>
         *      </dd>
         *  </dl>
    	 *
    	 * @config stroke
    	 * @type Object
    	 */
    	stroke: {
    		valueFn: "_getDefaultStroke",

    		setter: function(val)
    		{
    			var tmpl = this.get("stroke") || this._getDefaultStroke(),
                    wt;
                if(val && val.hasOwnProperty("weight"))
                {
                    wt = parseInt(val.weight, 10);
                    if(!isNaN(wt))
                    {
                        val.weight = wt;
                    }
                }
    			val = (val) ? Y.merge(tmpl, val) : null;
    			this._setStrokeProps(val);
    			return val;
    		}
    	},

    	//Not used. Remove in future.
    	autoSize: {
    		value: false
    	},

    	// Only implemented in SVG
    	// Determines whether the instance will receive mouse events.
    	//
    	// @config pointerEvents
    	// @type string
    	//
    	pointerEvents: {
    		value: "visiblePainted"
    	},

        /**
         * Represents an SVG Path string. This will be parsed and added to shape's API to represent the SVG data across all
         * implementations. Note that when using VML or SVG implementations, part of this content will be added to the DOM using
         * respective VML/SVG attributes. If your content comes from an untrusted source, you will need to ensure that no
         * malicious code is included in that content.
         *
         * @config data
         * @type String
         */
        data: {
            setter: function(val)
            {
                if(this.get("node"))
                {
                    this._parsePathData(val);
                }
                return val;
            }
        },

    	/**
    	 * Reference to the container Graphic.
    	 *
    	 * @config graphic
    	 * @type Graphic
    	 */
    	graphic: {
    		readOnly: true,

    		getter: function()
    		{
    			return this._graphic;
    		}
        }
    };
    Y.CanvasShape = CanvasShape;