axmol/cocos/2d/CCActionPageTurn3D.cpp

/****************************************************************************
Copyright (c) 2009      Sindesso Pty Ltd http://www.sindesso.com/
Copyright (c) 2010-2012 cocos2d-x.org
CopyRight (c) 2013-2014 Chukong Technologies Inc.
 
http://www.cocos2d-x.org

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#include "CCActionPageTurn3D.h"

NS_CC_BEGIN

PageTurn3D* PageTurn3D::create(float duration, const Size& gridSize)
{
    PageTurn3D *action = new PageTurn3D();

    if (action)
    {
        if (action->initWithDuration(duration, gridSize))
        {
            action->autorelease();
        }
        else
        {
            CC_SAFE_RELEASE_NULL(action);
        }
    }

    return action;
}

PageTurn3D *PageTurn3D::clone() const
{
	// no copy constructor	
	auto a = new PageTurn3D();
	a->initWithDuration(_duration, _gridSize);
	a->autorelease();
	return a;
}

/*
 * Update each tick
 * Time is the percentage of the way through the duration
 */
void PageTurn3D::update(float 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.width; ++i)
    {
        for (int j = 0; j <= _gridSize.height; ++j)
        {
            // Get original vertex
            Vector3 p = getOriginalVertex(Vector2(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 perspective 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
            setVertex(Vector2(i, j), p);
            
        }
    }
}

NS_CC_END