#

API Documentation for: 0.8.1
Show: Inherited Protected Private Deprecated

# File:DisplayProps.js

    /*
    * DisplayProps
    * 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.
    */

    /**
     * @module EaselJS
     */

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

    (function() {
    	"use strict";

    	/**
    	 * Used for calculating and encapsulating display related properties.
    	 * @class DisplayProps
    	 * @param {Number} [visible=true] Visible value.
    	 * @param {Number} [alpha=1] Alpha value.
    	 * @param {Number} [shadow=null] A Shadow instance or null.
    	 * @param {Number} [compositeOperation=null] A compositeOperation value or null.
    	 * @param {Number} [matrix] A transformation matrix. Defaults to a new identity matrix.
    	 * @constructor
    	 **/
    	function DisplayProps(visible, alpha, shadow, compositeOperation, matrix) {
    		this.setValues(visible, alpha, shadow, compositeOperation, matrix);

    	// public properties:
    		// assigned in the setValues method.
    		/**
    		 * Property representing the alpha that will be applied to a display object.
    		 * @property alpha
    		 * @type Number
    		 **/

    		/**
    		 * Property representing the shadow that will be applied to a display object.
    		 * @property shadow
    		 * @type Shadow
    		 **/

    		/**
    		 * Property representing the compositeOperation that will be applied to a display object.
    		 * You can find a list of valid composite operations at:
    		 * <a href="https://developer.mozilla.org/en/Canvas_tutorial/Compositing">https://developer.mozilla.org/en/Canvas_tutorial/Compositing</a>
    		 * @property compositeOperation
    		 * @type String
    		 **/

    		/**
    		 * Property representing the value for visible that will be applied to a display object.
    		 * @property visible
    		 * @type Boolean
    		 **/

    		/**
    		 * The transformation matrix that will be applied to a display object.
    		 * @property matrix
    		 * @type Matrix2D
    		 **/
    	}
    	var p = DisplayProps.prototype;

    // initialization:
    	/**
    	 * Reinitializes the instance with the specified values.
    	 * @method setValues
    	 * @param {Number} [visible=true] Visible value.
    	 * @param {Number} [alpha=1] Alpha value.
    	 * @param {Number} [shadow=null] A Shadow instance or null.
    	 * @param {Number} [compositeOperation=null] A compositeOperation value or null.
    	 * @param {Number} [matrix] A transformation matrix. Defaults to an identity matrix.
    	 * @return {DisplayProps} This instance. Useful for chaining method calls.
    	 * @chainable
    	*/
    	p.setValues = function (visible, alpha, shadow, compositeOperation, matrix) {
    		this.visible = visible == null ? true : !!visible;
    		this.alpha = alpha == null ? 1 : alpha;
    		this.shadow = shadow;
    		this.compositeOperation = compositeOperation;
    		this.matrix = matrix || (this.matrix&&this.matrix.identity()) || new createjs.Matrix2D();
    		return this;
    	};

    // public methods:
    	/**
    	 * Appends the specified display properties. This is generally used to apply a child's properties its parent's.
    	 * @method append
    	 * @param {Boolean} visible desired visible value
    	 * @param {Number} alpha desired alpha value
    	 * @param {Shadow} shadow desired shadow value
    	 * @param {String} compositeOperation desired composite operation value
    	 * @param {Matrix2D} [matrix] a Matrix2D instance
    	 * @return {DisplayProps} This instance. Useful for chaining method calls.
    	 * @chainable
    	*/
    	p.append = function(visible, alpha, shadow, compositeOperation, matrix) {
    		this.alpha *= alpha;
    		this.shadow = shadow || this.shadow;
    		this.compositeOperation = compositeOperation || this.compositeOperation;
    		this.visible = this.visible && visible;
    		matrix&&this.matrix.appendMatrix(matrix);
    		return this;
    	};

    	/**
    	 * Prepends the specified display properties. This is generally used to apply a parent's properties to a child's.
    	 * For example, to get the combined display properties that would be applied to a child, you could use:
    	 *
    	 * 	var o = myDisplayObject;
    	 * 	var props = new createjs.DisplayProps();
    	 * 	do {
    	 * 		// prepend each parent's props in turn:
    	 * 		props.prepend(o.visible, o.alpha, o.shadow, o.compositeOperation, o.getMatrix());
    	 * 	} while (o = o.parent);
    	 *
    	 * @method prepend
    	 * @param {Boolean} visible desired visible value
    	 * @param {Number} alpha desired alpha value
    	 * @param {Shadow} shadow desired shadow value
    	 * @param {String} compositeOperation desired composite operation value
    	 * @param {Matrix2D} [matrix] a Matrix2D instance
    	 * @return {DisplayProps} This instance. Useful for chaining method calls.
    	 * @chainable
    	*/
    	p.prepend = function(visible, alpha, shadow, compositeOperation, matrix) {
    		this.alpha *= alpha;
    		this.shadow = this.shadow || shadow;
    		this.compositeOperation = this.compositeOperation || compositeOperation;
    		this.visible = this.visible && visible;
    		matrix&&this.matrix.prependMatrix(matrix);
    		return this;
    	};

    	/**
    	 * Resets this instance and its matrix to default values.
    	 * @method identity
    	 * @return {DisplayProps} This instance. Useful for chaining method calls.
    	 * @chainable
    	*/
    	p.identity = function() {
    		this.visible = true;
    		this.alpha = 1;
    		this.shadow = this.compositeOperation = null;
    		this.matrix.identity();
    		return this;
    	};

    	/**
    	 * Returns a clone of the DisplayProps instance. Clones the associated matrix.
    	 * @method clone
    	 * @return {DisplayProps} a clone of the DisplayProps instance.
    	 **/
    	p.clone = function() {
    		return new DisplayProps(this.alpha, this.shadow, this.compositeOperation, this.visible, this.matrix.clone());
    	};

    // private methods:

    	createjs.DisplayProps = DisplayProps;
    })();