1 /****************************************************************************
  2  Copyright (c) 2010-2012 cocos2d-x.org
  3  Copyright (c) 2008-2010 Ricardo Quesada
  4  Copyright (c) 2011      Zynga Inc.
  5 
  6  http://www.cocos2d-x.org
  7 
  8  Permission is hereby granted, free of charge, to any person obtaining a copy
  9  of this software and associated documentation files (the "Software"), to deal
 10  in the Software without restriction, including without limitation the rights
 11  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 12  copies of the Software, and to permit persons to whom the Software is
 13  furnished to do so, subject to the following conditions:
 14 
 15  The above copyright notice and this permission notice shall be included in
 16  all copies or substantial portions of the Software.
 17 
 18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 19  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 20  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 21  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 22  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 23  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 24  THE SOFTWARE.
 25  ****************************************************************************/
 26 
 27 /**
 28  * @class
 29  * @extends cc.Class
 30  */
 31 cc.PointObject = cc.Class.extend(/** @lends cc.PointObject# */{
 32     _ratio:null,
 33     _offset:null,
 34     _child:null,
 35 
 36     /**
 37      * @return  {cc.Point}
 38      */
 39     getRatio:function () {
 40         return this._ratio;
 41     },
 42 
 43     /**
 44      * @param  {cc.Point} value
 45      */
 46     setRatio:function (value) {
 47         this._ratio = value;
 48     },
 49 
 50     /**
 51      * @return  {cc.Point}
 52      */
 53     getOffset:function () {
 54         return this._offset;
 55     },
 56 
 57     /**
 58      * @param {cc.Point} value
 59      */
 60     setOffset:function (value) {
 61         this._offset = value;
 62     },
 63 
 64     /**
 65      * @return {cc.Node}
 66      */
 67     getChild:function () {
 68         return this._child;
 69     },
 70 
 71     /**
 72      * @param  {cc.Node} value
 73      */
 74     setChild:function (value) {
 75         this._child = value;
 76     },
 77 
 78     /**
 79      * @param  {cc.Point} ratio
 80      * @param  {cc.Point} offset
 81      * @return {Boolean}
 82      */
 83     initWithCCPoint:function (ratio, offset) {
 84         this._ratio = ratio;
 85         this._offset = offset;
 86         this._child = null;
 87         return true;
 88     }
 89 });
 90 
 91 /**
 92  * @param {cc.Point} ratio
 93  * @param {cc.Point} offset
 94  * @return {cc.PointObject}
 95  */
 96 cc.PointObject.create = function (ratio, offset) {
 97     var ret = new cc.PointObject();
 98     ret.initWithCCPoint(ratio, offset);
 99     return ret;
100 };
101 
102 /**
103  * <p>cc.ParallaxNode: A node that simulates a parallax scroller<br />
104  * The children will be moved faster / slower than the parent according the the parallax ratio. </p>
105  * @class
106  * @extends cc.Node
107  */
108 cc.ParallaxNode = cc.Node.extend(/** @lends cc.ParallaxNode# */{
109     _lastPosition:null,
110     _parallaxArray:[],
111 
112     /**
113      * @return {Array}
114      */
115 
116     getParallaxArray:function () {
117         return this._parallaxArray;
118     },
119 
120     /**
121      * @param {Array} value
122      */
123     setParallaxArray:function (value) {
124         this._parallaxArray = value;
125     },
126 
127     /**
128      * Constructor
129      */
130     ctor:function () {
131         this._parallaxArray = [];
132         this._lastPosition = cc.p(-100, -100);
133     },
134 
135     /**
136      * Adds a child to the container with a z-order, a parallax ratio and a position offset
137      * It returns self, so you can chain several addChilds.
138      * @param {cc.Node} child
139      * @param {Number} z
140      * @param {cc.Point} ratio
141      * @param {cc.Point} offset
142      * @example
143      * //example
144      * voidNode.addChild(background, -1, cc.p(0.4, 0.5), cc.PointZero());
145      */
146     addChild:function (child, z, ratio, offset) {
147         if (arguments.length == 3) {
148             cc.Assert(0, "ParallaxNode: use addChild:z:parallaxRatio:positionOffset instead");
149             return;
150         }
151         cc.Assert(child != null, "Argument must be non-nil");
152         var obj = cc.PointObject.create(ratio, offset);
153         obj.setChild(child);
154         this._parallaxArray.push(obj);
155 
156         var pos = this._position;
157         pos.x = pos.x * ratio.x + offset.x;
158         pos.y = pos.y * ratio.y + offset.y;
159         child.setPosition(pos);
160 
161         this._super(child, z, child.getTag());
162     },
163 
164     /**
165      *  Remove Child
166      * @param {cc.Node} child
167      * @param {Boolean} cleanup
168      * @example
169      * //example
170      * voidNode.removeChild(background,true);
171      */
172     removeChild:function (child, cleanup) {
173         for (var i = 0; i < this._parallaxArray.length; i++) {
174             var point = this._parallaxArray[i];
175             if (point.getChild() == child) {
176                 this._parallaxArray.splice(i, 1);
177                 break;
178             }
179         }
180         this._super(child, cleanup);
181     },
182 
183     /**
184      *  Remove all children with cleanup
185      * @param {Boolean} cleanup
186      */
187     removeAllChildren:function (cleanup) {
188         this._parallaxArray = [];
189         this._super(cleanup);
190     },
191 
192     /**
193      * Visit
194      */
195     visit:function () {
196         var pos = this._absolutePosition();
197         if (!cc.Point.CCPointEqualToPoint(pos, this._lastPosition)) {
198             for (var i = 0; i < this._parallaxArray.length; i++) {
199                 var point = this._parallaxArray[i];
200                 var x = -pos.x + pos.x * point.getRatio().x + point.getOffset().x;
201                 var y = -pos.y + pos.y * point.getRatio().y + point.getOffset().y;
202                 point.getChild().setPosition(cc.p(x, y));
203             }
204             this._lastPosition = pos;
205         }
206         this._super();
207     },
208 
209     _absolutePosition:function () {
210         var ret = this._position;
211         var cn = this;
212         while (cn.getParent() != null) {
213             cn = cn.getParent();
214             ret = cc.pAdd(ret, cn.getPosition());
215         }
216         return ret;
217     }
218 });
219 
220 /**
221  * @return {cc.ParallaxNode}
222  * @example
223  * //example
224  * var voidNode = cc.ParallaxNode.create();
225  */
226 cc.ParallaxNode.create = function () {
227     return new cc.ParallaxNode();
228 };
229