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  @brief This action simulates a page turn from the bottom right hand corner of the screen.
 29  It's not much use by itself but is used by the PageTurnTransition.
 30 
 31  Based on an original paper by L Hong et al.
 32  http://www.parc.com/publication/1638/turning-pages-of-3d-electronic-books.html
 33 
 34  @since v0.8.2
 35  */
 36 
 37 cc.PageTurn3D = cc.Grid3DAction.extend({
 38     /*
 39      * Update each tick
 40      * Time is the percentage of the way through the duration
 41      */
 42     update:function (time) {
 43         var tt = Math.max(0, time - 0.25);
 44         var deltaAy = (tt * tt * 500);
 45         var ay = -100 - deltaAy;
 46 
 47         var deltaTheta = -Math.PI / 2 * Math.sqrt(time);
 48         var theta = /*0.01f */ +Math.PI / 2 + deltaTheta;
 49 
 50         var sinTheta = Math.sin(theta);
 51         var cosTheta = Math.cos(theta);
 52 
 53         for (var i = 0; i <= this._gridSize.x; ++i) {
 54             for (var j = 0; j <= this._gridSize.y; ++j) {
 55                 // Get original vertex
 56                 var p = this.originalVertex(cc.g(i, j));
 57 
 58                 var R = Math.sqrt((p.x * p.x) + ((p.y - ay) * (p.y - ay)));
 59                 var r = R * sinTheta;
 60                 var alpha = Math.asin(p.x / R);
 61                 var beta = alpha / sinTheta;
 62                 var cosBeta = Math.cos(beta);
 63 
 64                 // If beta > PI then we've wrapped around the cone
 65                 // Reduce the radius to stop these points interfering with others
 66                 if (beta <= Math.PI) {
 67                     p.x = ( r * Math.sin(beta));
 68                 }
 69                 else {
 70                     // Force X = 0 to stop wrapped
 71                     // points
 72                     p.x = 0;
 73                 }
 74 
 75                 p.y = ( R + ay - ( r * (1 - cosBeta) * sinTheta));
 76 
 77                 // We scale z here to avoid the animation being
 78                 // too much bigger than the screen due to perspectve transform
 79                 p.z = (r * ( 1 - cosBeta ) * cosTheta) / 7;// "100" didn't work for
 80 
 81                 //	Stop z coord from dropping beneath underlying page in a transition
 82                 // issue #751
 83                 if (p.z < 0.5) {
 84                     p.z = 0.5;
 85                 }
 86 
 87                 // Set new coords
 88                 this.setVertex(cc.g(i, j), p);
 89 
 90             }
 91         }
 92     }
 93 });
 94 
 95 /** create the action */
 96 cc.PageTurn3D.create = function (gridSize, time) {
 97     var action = new cc.PageTurn3D();
 98     return action;
 99 };
100