cocos2dx 利用CCOrbitCamera实现扑克牌翻牌效果

【注意】CCSpriteBatchNode不支持CCOrbitCamera动画。如果不需要用到CCSpriteBatchNode的话可以用下面这种方式：

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"

using namespace cocos2d;
using namespace CocosDenshion;

CCScene* HelloWorld::scene()
{
    CCScene *scene = CCScene::create();
    HelloWorld *layer = HelloWorld::create();
    scene->addChild(layer);
    return scene;
}
bool HelloWorld::init()
{
    if ( !CCLayer::init() )
    {
        return false;
    }
    size = CCDirector::sharedDirector()->getWinSize();
    
    //加一背景
    CCLayerColor* background = CCLayerColor::create(ccc4(255,180,255,255),size.width,size.height);
    this->addChild(background);
    
    actionIsDone = true;//标示动作是否完成
    
    createPoker(); //创建扑克
    
    return true;
}

//创建扑克
void HelloWorld::createPoker()
{
    //扑克牌正面
    CCSprite* pokerFront = CCSprite::create("poker_front.png");
    pokerFront->setVisible(false);
    pokerFront->setPosition(ccp(size.width/2,size.height/2));
    this->addChild(pokerFront,1,123);
  
    //扑克牌反面
    CCSprite* pokerBack = CCSprite::create("poker_back.png");
    pokerBack->setPosition(pokerFront->getPosition());
    this->addChild(pokerBack,321);
}
//翻牌动作
void HelloWorld::startOrbitAction()
{
    //扑克牌正面
    CCSprite* pokerFront = (CCSprite*)this->getChildByTag(123);
    //扑克牌反面
    CCSprite* pokerBack = (CCSprite*)this->getChildByTag(321);
    
    float orbitTime = 1;
    if (pokerFront->isVisible() == false && actionIsDone == true) {
        actionIsDone = false;
        //第一个参数是旋转的时间，第二个参数是起始半径，第三个参数半径差，第四个参数是起始Z角，第五个参数是旋转Z角差，第六个参数是起始X角，最后一个参数旋转X角差，
        CCOrbitCamera* orbitFront = CCOrbitCamera::create(orbitTime,270,90,0);
        CCSequence* sequenceFront = CCSequence::createWithTwoActions(CCShow::create(),orbitFront);
        CCTargetedAction* targetFront = CCTargetedAction::create(pokerFront,sequenceFront);

        CCOrbitCamera* orbitBack = CCOrbitCamera::create(orbitTime,0);
        pokerBack->runAction(CCSequence::create(orbitBack,CCHide::create(),targetFront,CCCallFunc::create(this,callfunc_selector(HelloWorld::actionIsDownFunc)),NULL));
    }else if(pokerFront->isVisible() == true && actionIsDone == true){
        actionIsDone = false;
        CCOrbitCamera* orbitFront = CCOrbitCamera::create(orbitTime,orbitFront);
        CCTargetedAction* targetFront = CCTargetedAction::create(pokerBack,sequenceFront);
        
        CCOrbitCamera* orbitBack = CCOrbitCamera::create(orbitTime,0);
        pokerFront->runAction(CCSequence::create(orbitBack,NULL));
    }
}

void HelloWorld::actionIsDownFunc()
{
    actionIsDone = true;
}

bool HelloWorld::ccTouchBegan(CCTouch *pTouch,CCEvent *pEvent)
{
    //翻牌动作
    startOrbitAction();
    return true;
}

void HelloWorld::ccTouchMoved(CCTouch *pTouch,CCEvent *pEvent){}
void HelloWorld::ccTouchEnded(CCTouch *pTouch,CCEvent *pEvent){}
void HelloWorld::onEnter()
{
    CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this,false);
    CCLayer::onEnter();
}
void HelloWorld::onExit()
{
    CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
    CCLayer::onExit();
}
HelloWorld::~HelloWorld(){}

第二种方式：如果考虑到性能问题要用到CCSpriteBatchNode的话，那么可以使用CCRotateTo来实现类似的功能：

//扑克牌正面（带数字的是正面）
    CCSprite* pokerFront = CCSprite::createWithSpriteFrameName("card_fg.png");
    // 数字
    CCSprite* pokerNumber = CCSprite::createWithSpriteFrameName("18.png");
    //扑克牌反面
    CCSprite* pokerBack = CCSprite::createWithSpriteFrameName("card_bg.png");
    
    pokerFront->setPosition(ccp(m_size.width/2,m_size.height/2));
    pokerBack->setPosition(ccp(m_size.width/2,m_size.height/2));
    pokerNumber->setPosition(ccp(m_size.width/2,m_size.height/2));
    
    m_spriteBatchNode->addChild(pokerFront);
    m_spriteBatchNode->addChild(pokerNumber);
    m_spriteBatchNode->addChild(pokerBack);
    
    
    CCRotateTo* rtFont1 = CCRotateTo::create(0.f,0.f,-90.f);
    CCRotateTo* rtNumber1 = CCRotateTo::create(0.f,-90.f);
    
    // 先将前景和数字旋转到要进行反过来使用的位置待用
    pokerFront->runAction(rtFont1);
    pokerNumber->runAction(rtNumber1);
    
    // 将牌的背面向Y轴旋转90度，这时候该面刚好旋转到被隐藏的位置
    CCRotateTo* rtBack = CCRotateTo::create(0.5f,90.f);
    // 讲牌的正面和数组从刚才的位置旋转到0度，这样子刚好和牌的背面动画衔接起来
    CCRotateTo* rtFont2 = CCRotateTo::create(0.5f,0.f);
    CCTargetedAction* ta = CCTargetedAction::create(pokerFront,rtFont2);
    CCRotateTo* rtNumber2 = CCRotateTo::create(0.5f,0.f);
    CCTargetedAction* taa = CCTargetedAction::create(pokerNumber,rtNumber2);
    
    pokerBack->runAction(CCSequence::create(rtBack,CCSpawn::create(ta,taa,nullptr),nullptr));

（编辑：李大同）

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