/*
* DisplayObject
* Visit http://createjs.com/ for documentation, updates and examples.
*
* Copyright (c) 2010 gskinner.com, inc.
* 
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
* 
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/

/**
 * The EaselJS Javascript library provides a retained graphics mode for canvas including a full hierarchical display
 * list, a core interaction model, and helper classes to make working with 2D graphics in Canvas much easier.
 * EaselJS provides straight forward solutions for working with rich graphics and interactivity with HTML5 Canvas...
 *
 * <h4>Getting Started</h4>
 * To get started with Easel, create a {{#crossLink "Stage"}}{{/crossLink}} that wraps a CANVAS element, and add
 * {{#crossLink "DisplayObject"}}{{/crossLink}} instances as children. EaselJS supports:
 * <ul>
 *      <li>Images using {{#crossLink "Bitmap"}}{{/crossLink}}</li>
 *      <li>Vector graphics using {{#crossLink "Shape"}}{{/crossLink}} and {{#crossLink "Graphics"}}{{/crossLink}}</li>
 *      <li>Animated bitmaps using {{#crossLink "SpriteSheet"}}{{/crossLink}} and {{#crossLink "Sprite"}}{{/crossLink}}
 *      <li>Simple text instances using {{#crossLink "Text"}}{{/crossLink}}</li>
 *      <li>Containers that hold other DisplayObjects using {{#crossLink "Container"}}{{/crossLink}}</li>
 *      <li>Control HTML DOM elements using {{#crossLink "DOMElement"}}{{/crossLink}}</li>
 * </ul>
 *
 * All display objects can be added to the stage as children, or drawn to a canvas directly.
 *
 * <b>User Interactions</b><br />
 * All display objects on stage (except DOMElement) will dispatch events when interacted with using a mouse or
 * touch. EaselJS supports hover, press, and release events, as well as an easy-to-use drag-and-drop model. Check out
 * {{#crossLink "MouseEvent"}}{{/crossLink}} for more information.
 *
 * <h4>Simple Example</h4>
 * This example illustrates how to create and position a {{#crossLink "Shape"}}{{/crossLink}} on the {{#crossLink "Stage"}}{{/crossLink}}
 * using EaselJS' drawing API.
 *
 *	    //Create a stage by getting a reference to the canvas
 *	    stage = new createjs.Stage("demoCanvas");
 *	    //Create a Shape DisplayObject.
 *	    circle = new createjs.Shape();
 *	    circle.graphics.beginFill("red").drawCircle(0, 0, 40);
 *	    //Set position of Shape instance.
 *	    circle.x = circle.y = 50;
 *	    //Add Shape instance to stage display list.
 *	    stage.addChild(circle);
 *	    //Update stage will render next frame
 *	    stage.update();
 *
 * <b>Simple Interaction Example</b><br>
 *
 *      displayObject.addEventListener("click", handleClick);
 *      function handleClick(event){
 *          // Click happenened
 *      }
 *
 *      displayObject.addEventListener("mousedown", handlePress);
 *      function handlePress(event) {
 *          // A mouse press happened.
 *          // Listen for mouse move while the mouse is down:
 *          event.addEventListener("mousemove", handleMove);
 *      }
 *      function handleMove(event) {
 *          // Check out the DragAndDrop example in GitHub for more
 *      }
 *
 * <b>Simple Animation Example</b><br />
 * This example moves the shape created in the previous demo across the screen.
 *
 *	    //Update stage will render next frame
 *	    createjs.Ticker.addEventListener("tick", handleTick);
 *
 *	    function handleTick() {
 *          //Circle will move 10 units to the right.
 *	    	circle.x += 10;
 *	    	//Will cause the circle to wrap back
 * 	    	if (circle.x > stage.canvas.width) { circle.x = 0; }
 *	    	stage.update();
 *	    }
 *
 * <h4>Other Features</h4>
 * EaselJS also has built in support for
 * <ul><li>Canvas features such as {{#crossLink "Shadow"}}{{/crossLink}} and CompositeOperation</li>
 *      <li>{{#crossLink "Ticker"}}{{/crossLink}}, a global heartbeat that objects can subscribe to</li>
 *      <li>Filters, including a provided {{#crossLink "ColorMatrixFilter"}}{{/crossLink}}, {{#crossLink "AlphaMaskFilter"}}{{/crossLink}},
 *      {{#crossLink "AlphaMapFilter"}}{{/crossLink}}, and {{#crossLink "BlurFilter"}}{{/crossLink}}. See {{#crossLink "Filter"}}{{/crossLink}}
 *      for more information</li>
 *      <li>A {{#crossLink "ButtonHelper"}}{{/crossLink}} utility, to easily create interactive buttons</li>
 *      <li>{{#crossLink "SpriteSheetUtils"}}{{/crossLink}} and a {{#crossLink "SpriteSheetBuilder"}}{{/crossLink}} to
 *      help build and manage {{#crossLink "SpriteSheet"}}{{/crossLink}} functionality at run-time.</li>
 * </ul>
 *
 * <h4>Browser Support</h4>
 * All modern browsers that support Canvas will support EaselJS (<a href="http://caniuse.com/canvas">http://caniuse.com/canvas</a>).
 * Browser performance may vary between platforms, for example, Android Canvas has poor hardware support, and is much
 * slower on average than most other browsers.
 *
 * @module EaselJS
 * @main EaselJS
 */

// namespace:
this.createjs = this.createjs||{};

(function() {
/**
 * DisplayObject is an abstract class that should not be constructed directly. Instead construct subclasses such as
 * {{#crossLink "Container"}}{{/crossLink}}, {{#crossLink "Bitmap"}}{{/crossLink}}, and {{#crossLink "Shape"}}{{/crossLink}}.
 * DisplayObject is the base class for all display classes in the EaselJS library. It defines the core properties and
 * methods that are shared between all display objects, such as transformation properties (x, y, scaleX, scaleY, etc),
 * caching, and mouse handlers.
 * @class DisplayObject
 * @extends EventDispatcher
 * @constructor
 **/
var DisplayObject = function() {
  this.initialize();
};
var p = DisplayObject.prototype = new createjs.EventDispatcher();

	/**
	 * Suppresses errors generated when using features like hitTest, mouse events, and {{#crossLink "getObjectsUnderPoint"}}{{/crossLink}}
	 * with cross domain content.
	 * @property suppressCrossDomainErrors
	 * @static
	 * @type {Boolean}
	 * @default false
	 **/
	DisplayObject.suppressCrossDomainErrors = false;

	/**
	 * @property _hitTestCanvas
	 * @type {HTMLCanvasElement | Object}
	 * @static
	 * @protected
	 **/
	 
	/**
	 * @property _hitTestContext
	 * @type {CanvasRenderingContext2D}
	 * @static
	 * @protected
	 **/
	var canvas = createjs.createCanvas?createjs.createCanvas():document.createElement("canvas"); // prevent errors on load in browsers without canvas.
	if (canvas.getContext) {
		DisplayObject._hitTestCanvas = canvas;
		DisplayObject._hitTestContext = canvas.getContext("2d");
		canvas.width = canvas.height = 1;
	}

	/**
	 * @property _nextCacheID
	 * @type {Number}
	 * @static
	 * @protected
	 **/
	DisplayObject._nextCacheID = 1;

// events:

	/**
	 * Dispatched when the user presses their left mouse button over the display object. See the 
	 * {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event mousedown
	 * @since 0.6.0
	 */
	 
	/**
	 * Dispatched when the user presses their left mouse button and then releases it while over the display object.
	 * See the {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event click
	 * @since 0.6.0
	 */
	 
	/**
	 * Dispatched when the user double clicks their left mouse button over this display object.
	 * See the {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event dblclick
	 * @since 0.6.0
	 */
	 
	/**
	 * Dispatched when the user's mouse enters this display object. This event must be enabled using 
	 * {{#crossLink "Stage/enableMouseOver"}}{{/crossLink}}. See also {{#crossLink "DisplayObject/rollover:event"}}{{/crossLink}}.
	 * See the {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event mouseover
	 * @since 0.6.0
	 */

	/**
	 * Dispatched when the user's mouse leaves this display object. This event must be enabled using 
	 * {{#crossLink "Stage/enableMouseOver"}}{{/crossLink}}. See also {{#crossLink "DisplayObject/rollout:event"}}{{/crossLink}}.
	 * See the {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event mouseout
	 * @since 0.6.0
	 */
	 
	/**
	 * This event is similar to {{#crossLink "DisplayObject/mouseover:event"}}{{/crossLink}}, with the following
	 * differences: it does not bubble, and it considers {{#crossLink "Container"}}{{/crossLink}} instances as an
	 * aggregate of their content.
	 * 
	 * For example, myContainer contains two overlapping children: shapeA and shapeB. The user moves their mouse over
	 * shapeA and then directly on to shapeB. With a listener for {{#crossLink "mouseover:event"}}{{/crossLink}} on
	 * myContainer, two events would be received, each targeting a child element:<OL>
	 * <LI>when the mouse enters shapeA (target=shapeA)</LI>
	 * <LI>when the mouse enters shapeB (target=shapeB)</LI>
	 * </OL>
	 * However, with a listener for "rollover" instead, only a single event is received when the mouse first enters
	 * the aggregate myContainer content (target=myContainer).
	 * 
	 * This event must be enabled using {{#crossLink "Stage/enableMouseOver"}}{{/crossLink}}.
	 * See the {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event rollover
	 * @since 0.7.0
	 */
	 
	/**
	 * This event is similar to {{#crossLink "DisplayObject/mouseout:event"}}{{/crossLink}}, with the following
	 * differences: it does not bubble, and it considers {{#crossLink "Container"}}{{/crossLink}} instances as an
	 * aggregate of their content.
	 * 
	 * For example, myContainer contains two overlapping children: shapeA and shapeB. The user moves their mouse over
	 * shapeA, then directly on to shapeB, then off both. With a listener for {{#crossLink "mouseout:event"}}{{/crossLink}}
	 * on myContainer, two events would be received, each targeting a child element:<OL>
	 * <LI>when the mouse leaves shapeA (target=shapeA)</LI>
	 * <LI>when the mouse leaves shapeB (target=shapeB)</LI>
	 * </OL>
	 * However, with a listener for "rollout" instead, only a single event is received when the mouse leaves
	 * the aggregate myContainer content (target=myContainer).
	 * 
	 * This event must be enabled using {{#crossLink "Stage/enableMouseOver"}}{{/crossLink}}.
	 * See the {{#crossLink "MouseEvent"}}{{/crossLink}} class for a listing of event properties.
	 * @event rollout
	 * @since 0.7.0
	 */
	 
	/**
	 * After a {{#crossLink "DisplayObject/mousedown:event"}}{{/crossLink}} occurs on a display object, a pressmove
	 * event will be generated on that object whenever the mouse moves until the mouse press is released. This can be
	 * useful for dragging and similar operations.
	 * @event pressmove
	 * @since 0.7.0
	 */
	 
	/**
	 * After a {{#crossLink "DisplayObject/mousedown:event"}}{{/crossLink}} occurs on a display object, a pressup event
	 * will be generated on that object when that mouse press is released. This can be useful for dragging and similar
	 * operations.
	 * @event pressup
	 * @since 0.7.0
	 */
	 
	/**
	 * Dispatched on each display object on a stage whenever the stage updates. This occurs immediately before the
	 * rendering (draw) pass. When {{#crossLink "Stage/update"}}{{/crossLink}} is called, first all display objects on
	 * the stage dispatch the tick event, then all of the display objects are drawn to stage. Children will have their
	 * {{#crossLink "tick:event"}}{{/crossLink}} event dispatched in order of their depth prior to the event being
	 * dispatched on their parent.
	 * @event tick
	 * @param {Object} target The object that dispatched the event.
	 * @param {String} type The event type.
	 * @param {Array} params An array containing any arguments that were passed to the Stage.update() method. For
	 *      example if you called stage.update("hello"), then the params would be ["hello"].
	 * @since 0.6.0
	 */

// public properties:
	/**
	 * The alpha (transparency) for this display object. 0 is fully transparent, 1 is fully opaque.
	 * @property alpha
	 * @type {Number}
	 * @default 1
	 **/
	p.alpha = 1;

	/**
	 * If a cache is active, this returns the canvas that holds the cached version of this display object. See {{#crossLink "cache"}}{{/crossLink}}
	 * for more information.
	 * @property cacheCanvas
	 * @type {HTMLCanvasElement | Object}
	 * @default null
	 * @readonly
	 **/
	p.cacheCanvas = null;

	/**
	 * Unique ID for this display object. Makes display objects easier for some uses.
	 * @property id
	 * @type {Number}
	 * @default -1
	 **/
	p.id = -1;

	/**
	 * Indicates whether to include this object when running mouse interactions. Setting this to `false` for children
	 * of a {{#crossLink "Container"}}{{/crossLink}} will cause events on the Container to not fire when that child is
	 * clicked. Note that setting this property to `false` does not prevent the {{#crossLink "Container/getObjectsUnderPoint"}}{{/crossLink}}
	 * method from returning the child.
	 * @property mouseEnabled
	 * @type {Boolean}
	 * @default true
	 **/
	p.mouseEnabled = true;

	/**
	 * An optional name for this display object. Included in {{#crossLink "DisplayObject/toString"}}{{/crossLink}} . Useful for
	 * debugging.
	 * @property name
	 * @type {String}
	 * @default null
	 **/
	p.name = null;

	/**
	 * A reference to the {{#crossLink "Container"}}{{/crossLink}} or {{#crossLink "Stage"}}{{/crossLink}} object that
	 * contains this display object, or null if it has not been added
	 * to one.
	 * @property parent
	 * @final
	 * @type {Container}
	 * @default null
	 * @readonly
	 **/
	p.parent = null;

	/**
	 * The left offset for this display object's registration point. For example, to make a 100x100px Bitmap rotate
	 * around its center, you would set regX and {{#crossLink "DisplayObject/regY:property"}}{{/crossLink}} to 50.
	 * @property regX
	 * @type {Number}
	 * @default 0
	 **/
	p.regX = 0;

	/**
	 * The y offset for this display object's registration point. For example, to make a 100x100px Bitmap rotate around
	 * its center, you would set {{#crossLink "DisplayObject/regX:property"}}{{/crossLink}} and regY to 50.
	 * @property regY
	 * @type {Number}
	 * @default 0
	 **/
	p.regY = 0;

	/**
	 * The rotation in degrees for this display object.
	 * @property rotation
	 * @type {Number}
	 * @default 0
	 **/
	p.rotation = 0;

	/**
	 * The factor to stretch this display object horizontally. For example, setting scaleX to 2 will stretch the display
	 * object to twice its nominal width. To horizontally flip an object, set the scale to a negative number.
	 * @property scaleX
	 * @type {Number}
	 * @default 1
	 **/
	p.scaleX = 1;

	/**
	 * The factor to stretch this display object vertically. For example, setting scaleY to 0.5 will stretch the display
	 * object to half its nominal height. To vertically flip an object, set the scale to a negative number.
	 * @property scaleY
	 * @type {Number}
	 * @default 1
	 **/
	p.scaleY = 1;

	/**
	 * The factor to skew this display object horizontally.
	 * @property skewX
	 * @type {Number}
	 * @default 0
	 **/
	p.skewX = 0;

	/**
	 * The factor to skew this display object vertically.
	 * @property skewY
	 * @type {Number}
	 * @default 0
	 **/
	p.skewY = 0;

	/**
	 * A shadow object that defines the shadow to render on this display object. Set to `null` to remove a shadow. If
	 * null, this property is inherited from the parent container.
	 * @property shadow
	 * @type {Shadow}
	 * @default null
	 **/
	p.shadow = null;

	/**
	 * Indicates whether this display object should be rendered to the canvas and included when running the Stage
	 * {{#crossLink "Stage/getObjectsUnderPoint"}}{{/crossLink}} method.
	 * @property visible
	 * @type {Boolean}
	 * @default true
	 **/
	p.visible = true;

	/**
	 * The x (horizontal) position of the display object, relative to its parent.
	 * @property x
	 * @type {Number}
	 * @default 0
	 **/
	p.x = 0;

	/** The y (vertical) position of the display object, relative to its parent.
	 * @property y
	 * @type {Number}
	 * @default 0
	 **/
	p.y = 0;

	/**
	 * The composite operation indicates how the pixels of this display object will be composited with the elements
	 * behind it. If `null`, this property is inherited from the parent container. For more information, read the
	 * <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#compositing">
	 * whatwg spec on compositing</a>.
	 * @property compositeOperation
	 * @type {String}
	 * @default null
	 **/
	p.compositeOperation = null;

	/**
	 * Indicates whether the display object should have its x & y position rounded prior to drawing it to stage.
	 * Snapping to whole pixels can result in a sharper and faster draw for images (ex. Bitmap & cached objects).
	 * This only applies if the enclosing stage has {{#crossLink "Stage/snapPixelsEnabled:property"}}{{/crossLink}} set
	 * to `true`. The snapToPixel property is `true` by default for {{#crossLink "Bitmap"}}{{/crossLink}} and {{#crossLink "Sprite"}}{{/crossLink}}
	 * instances, and `false` for all other display objects.
	 *
	 * Note that this applies only rounds the display object's local position. You should ensure that all of the display
	 * object's ancestors (parent containers) are also on a whole pixel. You can do this by setting the ancestors'
	 * snapToPixel property to `true`.
	 * @property snapToPixel
	 * @type {Boolean}
	 * @default false
	 * @deprecated Hardware acceleration in modern browsers makes this unnecessary.
	 **/
	p.snapToPixel = false;
	
	// TODO: remove handler docs in future:
	/**
	 * REMOVED. Use {{#crossLink "EventDispatcher/addEventListener"}}{{/crossLink}} and the {{#crossLink "DisplayObject/mousedown:event"}}{{/crossLink}}
	 * event.
	 * @property onPress
	 * @type {Function}
	 * @deprecated Use addEventListener and the "mousedown" event.
	 */
	/**
	 * REMOVED. Use {{#crossLink "EventDispatcher/addEventListener"}}{{/crossLink}} and the {{#crossLink "DisplayObject/click:event"}}{{/crossLink}}
	 * event.
	 * @property onClick
	 * @type {Function}
	 * @deprecated Use addEventListener and the "click" event.
	 */
	/**
	 * REMOVED. Use {{#crossLink "EventDispatcher/addEventListener"}}{{/crossLink}} and the {{#crossLink "DisplayObject/dblclick:event"}}{{/crossLink}}
	 * event.
	 * @property onDoubleClick
	 * @type {Function}
	 * @deprecated Use addEventListener and the "dblclick" event.
	 */
	/**
	 * REMOVED. Use {{#crossLink "EventDispatcher/addEventListener"}}{{/crossLink}} and the {{#crossLink "DisplayObject/mouseover:event"}}{{/crossLink}}
	 * event.
	 * @property onMouseOver
	 * @type {Function}
	 * @deprecated Use addEventListener and the "mouseover" event.
	 */
	/**
	 * REMOVED. Use {{#crossLink "EventDispatcher/addEventListener"}}{{/crossLink}} and the {{#crossLink "DisplayObject/mouseout:event"}}{{/crossLink}}
	 * event.
	 * @property onMouseOut
	 * @type {Function}
	 * @deprecated Use addEventListener and the "mouseout" event.
	 */
	/**
	 * REMOVED. Use {{#crossLink "EventDispatcher/addEventListener"}}{{/crossLink}} and the {{#crossLink "DisplayObject/tick:event"}}{{/crossLink}}
	 * event.
	 * @property onTick
	 * @type {Function}
	 * @deprecatedtick
	 */

	/**
	 * An array of Filter objects to apply to this display object. Filters are only applied / updated when {{#crossLink "cache"}}{{/crossLink}}
	 * or {{#crossLink "updateCache"}}{{/crossLink}} is called on the display object, and only apply to the area that is
	 * cached.
	 * @property filters
	 * @type {Array}
	 * @default null
	 **/
	p.filters = null;

	/**
	 * Returns an ID number that uniquely identifies the current cache for this display object. This can be used to
	 * determine if the cache has changed since a previous check.
	 * @property cacheID
	 * @type {Number}
	 * @default 0
	 */
	p.cacheID = 0;
	
	/**
	 * A Shape instance that defines a vector mask (clipping path) for this display object.  The shape's transformation
	 * will be applied relative to the display object's parent coordinates (as if it were a child of the parent).
	 * @property mask
	 * @type {Shape}
	 * @default null
	 */
	p.mask = null;
	
	/**
	 * A display object that will be tested when checking mouse interactions or testing {{#crossLink "Container/getObjectsUnderPoint"}}{{/crossLink}}.
	 * The hit area will have its transformation applied relative to this display object's coordinate space (as though
	 * the hit test object were a child of this display object and relative to its regX/Y). The hitArea will be tested
	 * using only its own `alpha` value regardless of the alpha value on the target display object, or the target's
	 * ancestors (parents).
	 * 
	 * If set on a {{#crossLink "Container"}}{{/crossLink}}, children of the Container will not receive mouse events.
	 * This is similar to setting {{#crossLink "mouseChildren"}}{{/crossLink}} to false.
	 *
	 * Note that hitArea is NOT currently used by the `hitTest()` method, nor is it supported for {{#crossLink "Stage"}}{{/crossLink}}.
	 * @property hitArea
	 * @type {DisplayObject}
	 * @default null
	 */
	p.hitArea = null;
	
	/**
	 * A CSS cursor (ex. "pointer", "help", "text", etc) that will be displayed when the user hovers over this display
	 * object. You must enable mouseover events using the {{#crossLink "Stage/enableMouseOver"}}{{/crossLink}} method to
	 * use this property. Setting a non-null cursor on a Container will override the cursor set on its descendants.
	 * @property cursor
	 * @type {String}
	 * @default null
	 */
	p.cursor = null;

// private properties:

	/**
	 * @property _cacheOffsetX
	 * @protected
	 * @type {Number}
	 * @default 0
	 **/
	p._cacheOffsetX = 0;

	/**
	 * @property _cacheOffsetY
	 * @protected
	 * @type {Number}
	 * @default 0
	 **/
	p._cacheOffsetY = 0;
	
	/**
	 * @property _cacheScale
	 * @protected
	 * @type {Number}
	 * @default 1
	 **/
	p._cacheScale = 1;

	/**
	* @property _cacheDataURLID
	* @protected
	* @type {Number}
	* @default 0
	*/
	p._cacheDataURLID = 0;
	
	/**
	* @property _cacheDataURL
	* @protected
	* @type {String}
	* @default null
	*/
	p._cacheDataURL = null;

	/**
	 * @property _matrix
	 * @protected
	 * @type {Matrix2D}
	 * @default null
	 **/
	p._matrix = null;

	/**
	 * @property _rectangle
	 * @protected
	 * @type {Rectangle}
	 * @default null
	 **/
	p._rectangle = null;

	/**
	 * @property _bounds
	 * @protected
	 * @type {Rectangle}
	 * @default null
	 **/
	p._bounds = null;
	

// constructor:
	// separated so it can be easily addressed in subclasses:

	/**
	 * Initialization method.
	 * @method initialize
	 * @protected
	*/
	p.initialize = function() {
		this.id = createjs.UID.get();
		this._matrix = new createjs.Matrix2D();
		this._rectangle = new createjs.Rectangle();
	};

// public methods:
	/**
	 * Returns true or false indicating whether the display object would be visible if drawn to a canvas.
	 * This does not account for whether it would be visible within the boundaries of the stage.
	 *
	 * NOTE: This method is mainly for internal use, though it may be useful for advanced uses.
	 * @method isVisible
	 * @return {Boolean} Boolean indicating whether the display object would be visible if drawn to a canvas
	 **/
	p.isVisible = function() {
		return !!(this.visible && this.alpha > 0 && this.scaleX != 0 && this.scaleY != 0);
	};

	/**
	 * Draws the display object into the specified context ignoring its visible, alpha, shadow, and transform.
	 * Returns <code>true</code> if the draw was handled (useful for overriding functionality).
	 *
	 * NOTE: This method is mainly for internal use, though it may be useful for advanced uses.
	 * @method draw
	 * @param {CanvasRenderingContext2D} ctx The canvas 2D context object to draw into.
	 * @param {Boolean} [ignoreCache=false] Indicates whether the draw operation should ignore any current cache. For example,
	 * used for drawing the cache (to prevent it from simply drawing an existing cache back into itself).
	 **/
	p.draw = function(ctx, ignoreCache) {
		var cacheCanvas = this.cacheCanvas;
		if (ignoreCache || !cacheCanvas) { return false; }
		var scale = this._cacheScale, offX = this._cacheOffsetX, offY = this._cacheOffsetY, fBounds;
		if (fBounds = this._applyFilterBounds(offX, offY, 0, 0)) {
			offX = fBounds.x;
			offY = fBounds.y;
		}
		ctx.drawImage(cacheCanvas, offX, offY, cacheCanvas.width/scale, cacheCanvas.height/scale);
		return true;
	};
	
	/**
	 * Applies this display object's transformation, alpha, globalCompositeOperation, clipping path (mask), and shadow
	 * to the specified context. This is typically called prior to {{#crossLink "DisplayObject/draw"}}{{/crossLink}}.
	 * @method updateContext
	 * @param {CanvasRenderingContext2D} ctx The canvas 2D to update.
	 **/
	p.updateContext = function(ctx) {
		var mtx, mask=this.mask, o=this;
		
		if (mask && mask.graphics && !mask.graphics.isEmpty()) {
			mtx = mask.getMatrix(mask._matrix);
			ctx.transform(mtx.a,  mtx.b, mtx.c, mtx.d, mtx.tx, mtx.ty);
			
			mask.graphics.drawAsPath(ctx);
			ctx.clip();
			
			mtx.invert();
			ctx.transform(mtx.a,  mtx.b, mtx.c, mtx.d, mtx.tx, mtx.ty);
		}
		
		mtx = o._matrix.identity().appendTransform(o.x, o.y, o.scaleX, o.scaleY, o.rotation, o.skewX, o.skewY, o.regX, o.regY);
		// TODO: should be a better way to manage this setting. For now, using dynamic access to avoid circular dependencies:
		if (createjs["Stage"]._snapToPixelEnabled && o.snapToPixel) { ctx.transform(mtx.a,  mtx.b, mtx.c, mtx.d, mtx.tx+0.5|0, mtx.ty+0.5|0); }
		else { ctx.transform(mtx.a,  mtx.b, mtx.c, mtx.d, mtx.tx, mtx.ty); }
		ctx.globalAlpha *= o.alpha;
		if (o.compositeOperation) { ctx.globalCompositeOperation = o.compositeOperation; }
		if (o.shadow) { this._applyShadow(ctx, o.shadow); }
	};

	/**
	 * Draws the display object into a new canvas, which is then used for subsequent draws. For complex content
	 * that does not change frequently (ex. a Container with many children that do not move, or a complex vector Shape),
	 * this can provide for much faster rendering because the content does not need to be re-rendered each tick. The
	 * cached display object can be moved, rotated, faded, etc freely, however if its content changes, you must
	 * manually update the cache by calling <code>updateCache()</code> or <code>cache()</code> again. You must specify
	 * the cache area via the x, y, w, and h parameters. This defines the rectangle that will be rendered and cached
	 * using this display object's coordinates.
	 *
	 * <h4>Example</h4>
	 * For example if you defined a Shape that drew a circle at 0, 0 with a radius of 25:
	 *
	 *      var shape = new createjs.Shape();
	 *      shape.graphics.beginFill("#ff0000").drawCircle(0, 0, 25);
	 *      myShape.cache(-25, -25, 50, 50);
	 *
	 * Note that filters need to be defined <em>before</em> the cache is applied. Check out the {{#crossLink "Filter"}}{{/crossLink}}
	 * class for more information. Some filters (ex. BlurFilter) will not work as expected in conjunction with the scale param.
	 * 
	 * Usually, the resulting cacheCanvas will have the dimensions width*scale by height*scale, however some filters (ex. BlurFilter)
	 * will add padding to the canvas dimensions.
	 *
	 * @method cache
	 * @param {Number} x The x coordinate origin for the cache region.
	 * @param {Number} y The y coordinate origin for the cache region.
	 * @param {Number} width The width of the cache region.
	 * @param {Number} height The height of the cache region.
	 * @param {Number} [scale=1] The scale at which the cache will be created. For example, if you cache a vector shape using
	 * 	myShape.cache(0,0,100,100,2) then the resulting cacheCanvas will be 200x200 px. This lets you scale and rotate
	 * 	cached elements with greater fidelity. Default is 1.
	 **/
	p.cache = function(x, y, width, height, scale) {
		// draw to canvas.
		scale = scale||1;
		if (!this.cacheCanvas) { this.cacheCanvas = createjs.createCanvas?createjs.createCanvas():document.createElement("canvas"); }
		this._cacheWidth = width;
		this._cacheHeight = height;
		this._cacheOffsetX = x;
		this._cacheOffsetY = y;
		this._cacheScale = scale;
		this.updateCache();
	};

	/**
	 * Redraws the display object to its cache. Calling updateCache without an active cache will throw an error.
	 * If compositeOperation is null the current cache will be cleared prior to drawing. Otherwise the display object
	 * will be drawn over the existing cache using the specified compositeOperation.
	 *
	 * <h4>Example</h4>
	 * Clear the current graphics of a cached shape, draw some new instructions, and then update the cache. The new line
	 * will be drawn on top of the old one.
	 *
	 *      // Not shown: Creating the shape, and caching it.
	 *      shapeInstance.clear();
	 *      shapeInstance.setStrokeStyle(3).beginStroke("#ff0000").moveTo(100, 100).lineTo(200,200);
	 *      shapeInstance.updateCache();
	 *
	 * @method updateCache
	 * @param {String} compositeOperation The compositeOperation to use, or null to clear the cache and redraw it.
	 * <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#compositing">
	 * whatwg spec on compositing</a>.
	 **/
	p.updateCache = function(compositeOperation) {
		var cacheCanvas = this.cacheCanvas, scale = this._cacheScale, offX = this._cacheOffsetX*scale, offY = this._cacheOffsetY*scale;
		var w = this._cacheWidth, h = this._cacheHeight, fBounds;
		if (!cacheCanvas) { throw "cache() must be called before updateCache()"; }
		var ctx = cacheCanvas.getContext("2d");
		
		// update bounds based on filters:
		if (fBounds = this._applyFilterBounds(offX, offY, w, h)) {
			offX = fBounds.x;
			offY = fBounds.y;
			w = fBounds.width;
			h = fBounds.height;
		}
		
		w = Math.ceil(w*scale);
		h = Math.ceil(h*scale);
		if (w != cacheCanvas.width || h != cacheCanvas.height) {
			// TODO: it would be nice to preserve the content if there is a compositeOperation.
			cacheCanvas.width = w;
			cacheCanvas.height = h;
		} else if (!compositeOperation) {
			ctx.clearRect(0, 0, w+1, h+1);
		}
		
		ctx.save();
		ctx.globalCompositeOperation = compositeOperation;
		ctx.setTransform(scale, 0, 0, scale, -offX, -offY);
		this.draw(ctx, true);
		// TODO: filters and cache scale don't play well together at present.
		this._applyFilters();
		ctx.restore();
		this.cacheID = DisplayObject._nextCacheID++;
	};

	/**
	 * Clears the current cache. See {{#crossLink "DisplayObject/cache"}}{{/crossLink}} for more information.
	 * @method uncache
	 **/
	p.uncache = function() {
		this._cacheDataURL = this.cacheCanvas = null;
		this.cacheID = this._cacheOffsetX = this._cacheOffsetY = 0;
		this._cacheScale = 1;
	};
	
	/**
	 * Returns a data URL for the cache, or null if this display object is not cached.
	 * Uses cacheID to ensure a new data URL is not generated if the cache has not changed.
	 * @method getCacheDataURL
	 * @return {String} The image data url for the cache.
	 **/
	p.getCacheDataURL = function() {
		if (!this.cacheCanvas) { return null; }
		if (this.cacheID != this._cacheDataURLID) { this._cacheDataURL = this.cacheCanvas.toDataURL(); }
		return this._cacheDataURL;
	};

	/**
	 * Returns the stage that this display object will be rendered on, or null if it has not been added to one.
	 * @method getStage
	 * @return {Stage} The Stage instance that the display object is a descendent of. null if the DisplayObject has not
	 * been added to a Stage.
	 **/
	p.getStage = function() {
		var o = this;
		while (o.parent) {
			o = o.parent;
		}
		// using dynamic access to avoid circular dependencies;
		if (o instanceof createjs["Stage"]) { return o; }
		return null;
	};

	/**
	 * Transforms the specified x and y position from the coordinate space of the display object
	 * to the global (stage) coordinate space. For example, this could be used to position an HTML label
	 * over a specific point on a nested display object. Returns a Point instance with x and y properties
	 * correlating to the transformed coordinates on the stage.
	 *
	 * <h4>Example</h4>
	 *
	 *      displayObject.x = 300;
	 *      displayObject.y = 200;
	 *      stage.addChild(displayObject);
	 *      var point = myDisplayObject.localToGlobal(100, 100);
	 *      // Results in x=400, y=300
	 *
	 * @method localToGlobal
	 * @param {Number} x The x position in the source display object to transform.
	 * @param {Number} y The y position in the source display object to transform.
	 * @return {Point} A Point instance with x and y properties correlating to the transformed coordinates
	 * on the stage.
	 **/
	p.localToGlobal = function(x, y) {
		var mtx = this.getConcatenatedMatrix(this._matrix);
		if (mtx == null) { return null; }
		mtx.append(1, 0, 0, 1, x, y);
		return new createjs.Point(mtx.tx, mtx.ty);
	};

	/**
	 * Transforms the specified x and y position from the global (stage) coordinate space to the
	 * coordinate space of the display object. For example, this could be used to determine
	 * the current mouse position within the display object. Returns a Point instance with x and y properties
	 * correlating to the transformed position in the display object's coordinate space.
	 *
	 * <h4>Example</h4>
	 *
	 *      displayObject.x = 300;
	 *      displayObject.y = 200;
	 *      stage.addChild(displayObject);
	 *      var point = myDisplayObject.globalToLocal(100, 100);
	 *      // Results in x=-200, y=-100
	 *
	 * @method globalToLocal
	 * @param {Number} x The x position on the stage to transform.
	 * @param {Number} y The y position on the stage to transform.
	 * @return {Point} A Point instance with x and y properties correlating to the transformed position in the
	 * display object's coordinate space.
	 **/
	p.globalToLocal = function(x, y) {
		var mtx = this.getConcatenatedMatrix(this._matrix);
		if (mtx == null) { return null; }
		mtx.invert();
		mtx.append(1, 0, 0, 1, x, y);
		return new createjs.Point(mtx.tx, mtx.ty);
	};

	/**
	 * Transforms the specified x and y position from the coordinate space of this display object to the coordinate
	 * space of the target display object. Returns a Point instance with x and y properties correlating to the
	 * transformed position in the target's coordinate space. Effectively the same as using the following code with
	 * {{#crossLink "DisplayObject/localToGlobal"}}{{/crossLink}} and {{#crossLink "DisplayObject/globalToLocal"}}{{/crossLink}}.
	 *
	 *      var pt = this.localToGlobal(x, y);
	 *      pt = target.globalToLocal(pt.x, pt.y);
	 *
	 * @method localToLocal
	 * @param {Number} x The x position in the source display object to transform.
	 * @param {Number} y The y position on the source display object to transform.
	 * @param {DisplayObject} target The target display object to which the coordinates will be transformed.
	 * @return {Point} Returns a Point instance with x and y properties correlating to the transformed position
	 * in the target's coordinate space.
	 **/
	p.localToLocal = function(x, y, target) {
		var pt = this.localToGlobal(x, y);
		return target.globalToLocal(pt.x, pt.y);
	};

	/**
	 * Shortcut method to quickly set the transform properties on the display object. All parameters are optional.
	 * Omitted parameters will have the default value set.
	 *
	 * <h4>Example</h4>
	 *
	 *      displayObject.setTransform(100, 100, 2, 2);
	 *
	 * @method setTransform
	 * @param {Number} [x=0] The horizontal translation (x position) in pixels
	 * @param {Number} [y=0] The vertical translation (y position) in pixels
	 * @param {Number} [scaleX=1] The horizontal scale, as a percentage of 1
	 * @param {Number} [scaleY=1] the vertical scale, as a percentage of 1
	 * @param {Number} [rotation=0] The rotation, in degrees
	 * @param {Number} [skewX=0] The horizontal skew factor
	 * @param {Number} [skewY=0] The vertical skew factor
	 * @param {Number} [regX=0] The horizontal registration point in pixels
	 * @param {Number} [regY=0] The vertical registration point in pixels
	 * @return {DisplayObject} Returns this instance. Useful for chaining commands.
	*/
	p.setTransform = function(x, y, scaleX, scaleY, rotation, skewX, skewY, regX, regY) {
		this.x = x || 0;
		this.y = y || 0;
		this.scaleX = scaleX == null ? 1 : scaleX;
		this.scaleY = scaleY == null ? 1 : scaleY;
		this.rotation = rotation || 0;
		this.skewX = skewX || 0;
		this.skewY = skewY || 0;
		this.regX = regX || 0;
		this.regY = regY || 0;
		return this;
	};
	
	/**
	 * Returns a matrix based on this object's transform.
	 * @method getMatrix
	 * @param {Matrix2D} matrix Optional. A Matrix2D object to populate with the calculated values. If null, a new
	 * Matrix object is returned.
	 * @return {Matrix2D} A matrix representing this display object's transform.
	 **/
	p.getMatrix = function(matrix) {
		var o = this;
		return (matrix ? matrix.identity() : new createjs.Matrix2D()).appendTransform(o.x, o.y, o.scaleX, o.scaleY, o.rotation, o.skewX, o.skewY, o.regX, o.regY).appendProperties(o.alpha, o.shadow, o.compositeOperation);
	};
	
	/**
	 * Generates a concatenated Matrix2D object representing the combined transform of the display object and all of its
	 * parent Containers up to the highest level ancestor (usually the {{#crossLink "Stage"}}{{/crossLink}}). This can
	 * be used to transform positions between coordinate spaces, such as with {{#crossLink "DisplayObject/localToGlobal"}}{{/crossLink}}
	 * and {{#crossLink "DisplayObject/globalToLocal"}}{{/crossLink}}.
	 * @method getConcatenatedMatrix
	 * @param {Matrix2D} [mtx] A {{#crossLink "Matrix2D"}}{{/crossLink}} object to populate with the calculated values.
	 * If null, a new Matrix2D object is returned.
	 * @return {Matrix2D} a concatenated Matrix2D object representing the combined transform of the display object and
	 * all of its parent Containers up to the highest level ancestor (usually the {{#crossLink "Stage"}}{{/crossLink}}).
	 **/
	p.getConcatenatedMatrix = function(matrix) {
		if (matrix) { matrix.identity(); }
		else { matrix = new createjs.Matrix2D(); }
		var o = this;
		while (o != null) {
			matrix.prependTransform(o.x, o.y, o.scaleX, o.scaleY, o.rotation, o.skewX, o.skewY, o.regX, o.regY).prependProperties(o.alpha, o.shadow, o.compositeOperation);
			o = o.parent;
		}
		return matrix;
	};

	/**
	 * Tests whether the display object intersects the specified local point (ie. draws a pixel with alpha > 0 at
	 * the specified position). This ignores the alpha, shadow and compositeOperation of the display object, and all
	 * transform properties including regX/Y.
	 *
	 * <h4>Example</h4>
	 *
	 *      stage.addEventListener("stagemousedown", handleMouseDown);
	 *      function handleMouseDown(event) {
	 *          var hit = myShape.hitTest(event.stageX, event.stageY);
	 *      }
	 *
	 * Please note that shape-to-shape collision is not currently supported by EaselJS.
	 * @method hitTest
	 * @param {Number} x The x position to check in the display object's local coordinates.
	 * @param {Number} y The y position to check in the display object's local coordinates.
	 * @return {Boolean} A Boolean indicting whether a visible portion of the DisplayObject intersect the specified
	 * local Point.
	*/
	p.hitTest = function(x, y) {
		// TODO: update with support for .hitArea and update hitArea docs?
		var ctx = DisplayObject._hitTestContext;
		ctx.setTransform(1, 0, 0, 1, -x, -y);
		this.draw(ctx);

		var hit = this._testHit(ctx);
		ctx.setTransform(1, 0, 0, 1, 0, 0);
		ctx.clearRect(0, 0, 2, 2);
		return hit;
	};
	
	/**
	 * Provides a chainable shortcut method for setting a number of properties on a DisplayObject instance.
	 *
	 * <h4>Example</h4>
	 *
	 *      var myGraphics = new createjs.Graphics().beginFill("#ff0000").drawCircle(0, 0, 25);
	 *      var shape = stage.addChild(new Shape())
	 *          .set({graphics:myGraphics, x:100, y:100, alpha:0.5});
	 *
	 * @method set
	 * @param {Object} props A generic object containing properties to copy to the DisplayObject instance.
	 * @return {DisplayObject} Returns The DisplayObject instance the method is called on (useful for chaining calls.)
	*/
	p.set = function(props) {
		for (var n in props) { this[n] = props[n]; }
		return this;
	};
	
	/**
	 * Returns a rectangle representing this object's bounds in its local coordinate system (ie. with no transformation).
	 * Objects that have been cached will return the bounds of the cache.
	 * 
	 * Not all display objects can calculate their own bounds (ex. Shape). For these objects, you can use 
	 * {{#crossLink "DisplayObject/setBounds"}}{{/crossLink}} so that they are included when calculating Container
	 * bounds.
	 * 
	 * <table>
	 * 	<tr><td><b>All</b></td><td>
	 * 		All display objects support setting bounds manually using setBounds(). Likewise, display objects that
	 * 		have been cached using cache() will return the bounds of their cache. Manual and cache bounds will override
	 * 		the automatic calculations listed below.
	 * 	</td></tr>
	 * 	<tr><td><b>Bitmap</b></td><td>
	 * 		Returns the width and height of the sourceRect (if specified) or image, extending from (x=0,y=0).
	 * 	</td></tr>
	 * 	<tr><td><b>Sprite</b></td><td>
	 * 		Returns the bounds of the current frame. May have non-zero x/y if a frame registration point was specified
	 * 		in the spritesheet data. See also {{#crossLink "SpriteSheet/getFrameBounds"}}{{/crossLink}}
	 * 	</td></tr>
	 * 	<tr><td><b>Container</b></td><td>
	 * 		Returns the aggregate (combined) bounds of all children that return a non-null value from getBounds().
	 * 	</td></tr>
	 * 	<tr><td><b>Shape</b></td><td>
	 * 		Does not currently support automatic bounds calculations. Use setBounds() to manually define bounds.
	 * 	</td></tr>
	 * 	<tr><td><b>Text</b></td><td>
	 * 		Returns approximate bounds. Horizontal values (x/width) are quite accurate, but vertical values (y/height) are
	 * 		not, especially when using textBaseline values other than "top".
	 * 	</td></tr>
	 * 	<tr><td><b>BitmapText</b></td><td>
	 * 		Returns approximate bounds. Values will be more accurate if spritesheet frame registration points are close
	 * 		to (x=0,y=0).
	 * 	</td></tr>
	* </table>
	 * 
	 * Bounds can be expensive to calculate for some objects (ex. text, or containers with many children), and
	 * are recalculated each time you call getBounds(). You can prevent recalculation on static objects by setting the
	 * bounds explicitly:
	 * 
	 * 	var bounds = obj.getBounds();
	 * 	obj.setBounds(bounds.x, bounds.y, bounds.width, bounds.height);
	 * 	// getBounds will now use the set values, instead of recalculating
	 * 
	 * To reduce memory impact, the returned Rectangle instance may be reused internally; clone the instance or copy its
	 * values if you need to retain it.
	 * 
	 * 	var myBounds = obj.getBounds().clone();
	 * 	// OR:
	 * 	myRect.copy(obj.getBounds());
	 * 
	 * @method getBounds
	 * @return {Rectangle} A Rectangle instance representing the bounds, or null if bounds are not available for this
	 * object.
	 **/
	p.getBounds = function() {
		if (this._bounds) { return this._rectangle.copy(this._bounds); }
		var cacheCanvas = this.cacheCanvas;
		if (cacheCanvas) {
			var scale = this._cacheScale;
			return this._rectangle.initialize(this._cacheOffsetX, this._cacheOffsetY, cacheCanvas.width/scale, cacheCanvas.height/scale);
		}
		return null;
	};
	
	/**
	 * Returns a rectangle representing this object's bounds in its parent's coordinate system (ie. with transformations applied).
	 * Objects that have been cached will return the transformed bounds of the cache.
	 * 
	 * Not all display objects can calculate their own bounds (ex. Shape). For these objects, you can use 
	 * {{#crossLink "DisplayObject/setBounds"}}{{/crossLink}} so that they are included when calculating Container
	 * bounds.
	 * 
	 * To reduce memory impact, the returned Rectangle instance may be reused internally; clone the instance or copy its
	 * values if you need to retain it.
	 * 
	 * Container instances calculate aggregate bounds for all children that return bounds via getBounds.
	 * @method getTransformedBounds
	 * @return {Rectangle} A Rectangle instance representing the bounds, or null if bounds are not available for this object.
	 **/
	p.getTransformedBounds = function() {
		return this._getBounds();
	};
	
	/**
	 * Allows you to manually specify the bounds of an object that either cannot calculate their own bounds (ex. Shape &
	 * Text) for future reference, or so the object can be included in Container bounds. Manually set bounds will always
	 * override calculated bounds.
	 * 
	 * The bounds should be specified in the object's local (untransformed) coordinates. For example, a Shape instance
	 * with a 25px radius circle centered at 0,0 would have bounds of (-25, -25, 50, 50).
	 * @method setBounds
	 * @param {Number} x The x origin of the bounds. Pass null to remove the manual bounds.
	 * @param {Number} y The y origin of the bounds.
	 * @param {Number} width The width of the bounds.
	 * @param {Number} height The height of the bounds.
	 **/
	p.setBounds = function(x, y, width, height) {
		if (x == null) { this._bounds = x; }
		this._bounds = (this._bounds || new createjs.Rectangle()).initialize(x, y, width, height);
	};

	/**
	 * Returns a clone of this DisplayObject. Some properties that are specific to this instance's current context are
	 * reverted to their defaults (for example .parent). Also note that caches are not maintained across clones.
	 * @method clone
	 * @return {DisplayObject} A clone of the current DisplayObject instance.
	 **/
	p.clone = function() {
		var o = new DisplayObject();
		this.cloneProps(o);
		return o;
	};

	/**
	 * Returns a string representation of this object.
	 * @method toString
	 * @return {String} a string representation of the instance.
	 **/
	p.toString = function() {
		return "[DisplayObject (name="+  this.name +")]";
	};

// private methods:

	// separated so it can be used more easily in subclasses:
	/**
	 * @method cloneProps
	 * @protected
	 * @param {DisplayObject} o The DisplayObject instance which will have properties from the current DisplayObject
	 * instance copied into.
	 **/
	p.cloneProps = function(o) {
		o.alpha = this.alpha;
		o.name = this.name;
		o.regX = this.regX;
		o.regY = this.regY;
		o.rotation = this.rotation;
		o.scaleX = this.scaleX;
		o.scaleY = this.scaleY;
		o.shadow = this.shadow;
		o.skewX = this.skewX;
		o.skewY = this.skewY;
		o.visible = this.visible;
		o.x  = this.x;
		o.y = this.y;
		o._bounds = this._bounds;
		o.mouseEnabled = this.mouseEnabled;
		o.compositeOperation = this.compositeOperation;
	};

	/**
	 * @method _applyShadow
	 * @protected
	 * @param {CanvasRenderingContext2D} ctx
	 * @param {Shadow} shadow
	 **/
	p._applyShadow = function(ctx, shadow) {
		shadow = shadow || Shadow.identity;
		ctx.shadowColor = shadow.color;
		ctx.shadowOffsetX = shadow.offsetX;
		ctx.shadowOffsetY = shadow.offsetY;
		ctx.shadowBlur = shadow.blur;
	};
	
	
	/**
	 * @method _tick
	 * @param {Array} params Parameters to pass on to any listeners of the tick function. This will usually include the
	 * properties from the {{#crossLink "Ticker"}}{{/crossLink}} "tick" event, such as `delta` and `paused`, but may
	 * be undefined or contain other values depending on the usage by the application.
	 * @protected
	 **/
	p._tick = function(params) {
		// because tick can be really performance sensitive, we'll inline some of the dispatchEvent work.
		var ls = this._listeners;
		if (ls && ls["tick"]) {
			var evt = new createjs.Event("tick");
			evt.params = params;
			this._dispatchEvent(evt, this, 2);
		}
	};

	/**
	 * @method _testHit
	 * @protected
	 * @param {CanvasRenderingContext2D} ctx
	 * @return {Boolean}
	 **/
	p._testHit = function(ctx) {
		try {
			var hit = ctx.getImageData(0, 0, 1, 1).data[3] > 1;
		} catch (e) {
			if (!DisplayObject.suppressCrossDomainErrors) {
				throw "An error has occurred. This is most likely due to security restrictions on reading canvas pixel data with local or cross-domain images.";
			}
		}
		return hit;
	};

	/**
	 * @method _applyFilters
	 * @protected
	 **/
	p._applyFilters = function() {
		if (!this.filters || this.filters.length == 0 || !this.cacheCanvas) { return; }
		var l = this.filters.length;
		var ctx = this.cacheCanvas.getContext("2d");
		var w = this.cacheCanvas.width;
		var h = this.cacheCanvas.height;
		for (var i=0; i<l; i++) {
			this.filters[i].applyFilter(ctx, 0, 0, w, h);
		}
	};
	
	/**
	 * @method _applyFilterBounds
	 * @param {Number} x
	 * @param {Number} y
	 * @param {Number} width
	 * @param {Number} height
	 * @return {Rectangle}
	 * @protected
	 **/
	p._applyFilterBounds = function(x, y, width, height) {
		var bounds, l, filters = this.filters;
		if (!filters || !(l=filters.length)) { return; }
		
		for (var i=0; i<l; i++) {
			var f = this.filters[i];
			var fBounds = f.getBounds&&f.getBounds();
			if (!fBounds) { continue; }
			if (!bounds) { bounds = this._rectangle.initialize(x,y,width,height); }
			bounds.x += fBounds.x;
			bounds.y += fBounds.y;
			bounds.width += fBounds.width;
			bounds.height += fBounds.height;
		}
		return bounds;
	};
	
	/**
	 * @method _getBounds
	 * @param {Matrix2D} matrix
	 * @param {Boolean} ignoreTransform If true, does not apply this object's transform.
	 * @return {Rectangle}
	 * @protected
	 **/
	p._getBounds = function(matrix, ignoreTransform){
		return this._transformBounds(this.getBounds(), matrix, ignoreTransform);
	};
	
	/**
	 * @method _transformBounds
	 * @param {Rectangle} bounds
	 * @param {Matrix2D} matrix
	 * @param {Boolean} ignoreTransform
	 * @return {Rectangle}
	 * @protected
	 **/
	p._transformBounds = function(bounds, matrix, ignoreTransform) {
		if (!bounds) { return bounds; }
		var x = bounds.x, y = bounds.y, width = bounds.width, height = bounds.height;
		var mtx = ignoreTransform ? this._matrix.identity() : this.getMatrix(this._matrix);
		
		if (x || y) { mtx.appendTransform(0,0,1,1,0,0,0,-x,-y); }
		if (matrix) { mtx.prependMatrix(matrix); }
		
		var x_a = width*mtx.a, x_b = width*mtx.b;
		var y_c = height*mtx.c, y_d = height*mtx.d;
		var tx = mtx.tx, ty = mtx.ty;
		
		var minX = tx, maxX = tx, minY = ty, maxY = ty;

		if ((x = x_a + tx) < minX) { minX = x; } else if (x > maxX) { maxX = x; }
		if ((x = x_a + y_c + tx) < minX) { minX = x; } else if (x > maxX) { maxX = x; }
		if ((x = y_c + tx) < minX) { minX = x; } else if (x > maxX) { maxX = x; }
		
		if ((y = x_b + ty) < minY) { minY = y; } else if (y > maxY) { maxY = y; }
		if ((y = x_b + y_d + ty) < minY) { minY = y; } else if (y > maxY) { maxY = y; }
		if ((y = y_d + ty) < minY) { minY = y; } else if (y > maxY) { maxY = y; }
		
		return bounds.initialize(minX, minY, maxX-minX, maxY-minY);
	};

createjs.DisplayObject = DisplayObject;
}());