cocos2d-X CCsprite点击问题

cocos2d-x CCLayer上精灵的点击判断的问题

今天发现的问题，记录下，对cocos2d坐标转换的理解还不透彻，看来有必要去学习下OpenGL的基础知识了。

//使用的2dx是老版本.

1. 平时在CCLayer上放置的CCSprite，判断是否被点击到的，我一般这样做:

//on "init" you need to initialize your instance
bool  HelloWorld::init()
{
    bool  bRet = false ;
    do
    {
        CC_BREAK_IF(! CCLayer::init());

        //Get window size.
        CCSize size = CCDirector::sharedDirector()->getWinSize();

        //pSprite is a CCSprite for test.
        pSprite = CCSprite::spriteWithFile( "fjut.png" );
        CC_BREAK_IF(! pSprite);

        //Place the sprite on the center of the screen
        pSprite->setPosition(ccp(size.width/2, size.height/2));

        this ->addChild(pSprite, 0);
        bRet = true ;
    } while  (0);

    this ->setIsTouchEnabled( true );
    return  bRet;
}
void  HelloWorld::registerWithTouchDispatcher()
{
    CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate( this , -1988, true );
}

static  CCRect getRect(CCNode* pNode)
{
    CCRect rc;
    rc.origin = pNode->getPosition();
    rc.size = pNode->getContentSize();
    rc.origin.x -= rc.size.width*0.5;
    rc.origin.y -= rc.size.height*0.5;
    return  rc;
}

void  HelloWorld::ccTouchEnded(CCTouch* pTouch, CCEvent* event)
{
    CCPoint touchLocation = convertTouchToNodeSpace(pTouch);
    if (CCRect::CCRectContainsPoint(getRect(pSprite), touchLocation))
    {
        printf ( "我被点中了!\n" );
    }
}

bool  HelloWorld::ccTouchBegan(CCTouch* touch, CCEvent* event)
{
    return  true ;
}

2. 要是在CCLayer1上放置CCLayer2(有偏移)，再向CCLayer2上放置CCSprite的点击判断需要计算偏移量：

eg:

//on "init" you need to initialize your instance
bool  HelloWorld::init()
{
    bool  bRet = false ;
    do
    {
        CC_BREAK_IF(! CCLayer::init());
        bRet = true ;
    } while  (0);

    this ->setIsTouchEnabled( true );

    this ->testLayer();

    return  bRet;
}

void  HelloWorld::testLayer()
{
    CCLayer* ly = CCLayer::node();
    /*x, y轴各偏移100*/
    ly->setPosition(ccp(100, 100));

    //layer2 add to layer1
    this ->addChild(ly);

    pSprite = CCSprite::spriteWithFile( "fjut.png" );
    pSprite->setPosition(ccp(20, 20));
    ly->addChild(pSprite, 0);
}

void  HelloWorld::registerWithTouchDispatcher()
{
    CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate( this , -1988, true );
}

static  CCRect getRect(CCNode* pNode)
{
    CCRect rc;
    rc.origin = pNode->getPosition();
    rc.size = pNode->getContentSize();
    /*x, y轴各偏移100*/
    rc.origin.x -= rc.size.width*0.5 - 100; //！！！！
    rc.origin.y -= rc.size.height*0.5 - 100; //！！！！
    return  rc;
}

void  HelloWorld::ccTouchEnded(CCTouch* pTouch, CCEvent* event)
{
    CCPoint touchLocation = convertTouchToNodeSpace(pTouch);
    if (CCRect::CCRectContainsPoint(getRect(pSprite), touchLocation))
    {
        printf ( "我被点中了!\n" );
    }
}

bool  HelloWorld::ccTouchBegan(CCTouch* touch, CCEvent* event)
{
    return  true ;
}

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