RedCore/cocos2d/cocos/2d/CCActionPageTurn3D.cpp

/****************************************************************************
Copyright (c) 2009      Sindesso Pty Ltd http://www.sindesso.com/
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2017 Chukong Technologies Inc.
 
http://www.cocos2d-x.org

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all copies or substantial portions of the Software.

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#include "2d/CCActionPageTurn3D.h"
#include "2d/CCGrid.h"
#include "2d/CCNodeGrid.h"

NS_CC_BEGIN

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

    if (action && action->initWithDuration(duration, gridSize))
    {
        action->autorelease();
        return action;
    }

    delete action;
    return nullptr;
}

PageTurn3D *PageTurn3D::clone() const
{
    // no copy constructor
    return PageTurn3D::create(_duration, _gridSize);
}

GridBase* PageTurn3D::getGrid()
{
    auto result = Grid3D::create(_gridSize, _gridNodeTarget->getGridRect());
    if (result)
    {
        result->setNeedDepthTestForBlit(true);
    }
    
    return result;
}

/*
 * 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 = sqrtf(time);
    float theta = deltaTheta > 0.5f ? (float)M_PI_2*deltaTheta : (float)M_PI_2*(1-deltaTheta);
    
    float rotateByYAxis = (2-time)* M_PI;
    
    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
            Vec3 p = getOriginalVertex(Vec2(i ,j));
            
            p.x -= getGridRect().origin.x;
            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);// "100" didn't work for
            p.x = p.z * sinf(rotateByYAxis) + p.x * cosf(rotateByYAxis);
            p.z = p.z * cosf(rotateByYAxis) - p.x * sinf(rotateByYAxis);
            p.z/=7;
            //    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
            p.x += getGridRect().origin.x;
            setVertex(Vec2(i, j), p);
            
        }
    }
}

NS_CC_END