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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright (c) 2009 Sindesso Pty Ltd http://www.sindesso.com/
+ *
+ * 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.
+ *
+ */
+
+#import "CCActionPageTurn3D.h"
+
+@implementation CCPageTurn3D
+
+/*
+ * Update each tick
+ * Time is the percentage of the way through the duration
+ */
+-(void)update:(ccTime)time
+{
+        float tt = MAX( 0, time - 0.25f );
+        float deltaAy = ( tt * tt * 500);
+        float ay = -100 - deltaAy;
+        
+        float deltaTheta = - (float) M_PI_2 * sqrtf( time) ;
+        float theta = /*0.01f*/ + (float) M_PI_2 +deltaTheta;
+        
+        float sinTheta = sinf(theta);
+        float cosTheta = cosf(theta);
+        
+        for( int i = 0; i <=gridSize_.x; i++ )
+        {
+                for( int j = 0; j <= gridSize_.y; j++ )
+                {
+                        // Get original vertex
+                        ccVertex3F      p = [self originalVertex:ccg(i,j)];
+                        
+                        float R = sqrtf(p.x*p.x + (p.y - ay) * (p.y - ay));
+                        float r = R * sinTheta;
+                        float alpha = asinf( p.x / R );
+                        float beta = alpha / sinTheta;
+                        float cosBeta = cosf( beta );
+                        
+                        // If beta > PI then we've wrapped around the cone
+                        // Reduce the radius to stop these points interfering with others
+                        if( beta <= M_PI)
+                                p.x = ( r * sinf(beta));
+                        else
+                        {
+                                // Force X = 0 to stop wrapped
+                                // points
+                                p.x = 0;
+                        }
+                        
+                        p.y = ( R + ay - ( r*(1 - cosBeta)*sinTheta));
+                        
+                        // We scale z here to avoid the animation being
+                        // too much bigger than the screen due to perspectve transform
+                        p.z = (r * ( 1 - cosBeta ) * cosTheta) / 7; // "100" didn't work for
+                                
+                        // Stop z coord from dropping beneath underlying page in a transition
+                        // issue #751                           
+                        if( p.z<0.5f )
+                                p.z = 0.5f;
+                        
+                        // Set new coords
+                        [self setVertex:ccg(i,j) vertex:p];
+                }
+        }
+}
+@end