cocos2dx 矩形碰撞检测

bool HelloWorld::init()  
{  
    //////////////////////////////  
    // 1. super init first  
    if ( !CCLayer::init() )  
    {  
        return false;  
    }  
  
      
    CCSprite* sp1 = CCSprite::create("Icon.png");  
    sp1->setPosition(ccp(200, 160));  
    addChild(sp1, 0, 1);  
      
    CCSprite* sp2 = CCSprite::create("Icon.png");  
    sp2->setPosition(ccp(300, 160));  
    addChild(sp2, 0, 2);  
      
    CCLabelTTF* label = CCLabelTTF::create("没有发生碰撞", "Thonburi",24);  
    label->setPosition(ccp(240, 280));  
    addChild(label, 1, 3);  
      
      
    return true;  
}  
  
  
bool HelloWorld::ccTouchBegan(cocos2d::CCTouch *touch, cocos2d::CCEvent *event)  
{  
    CCSprite* sp1 = (CCSprite*)getChildByTag(1);  
    sp1->setPosition(touch->getLocation());  
    return true;  
}  
  
void HelloWorld::ccTouchMoved(cocos2d::CCTouch *touch, cocos2d::CCEvent *event)  
{  
    CCSprite* sp1 = (CCSprite*) getChildByTag(1);  
    sp1->setPosition(touch->getLocation());  
      
    CCSprite* sp2 = (CCSprite*)getChildByTag(2);  
      
    CCLabelTTF* label = (CCLabelTTF*) getChildByTag(3);  
      
    //碰撞检测，矩形碰撞  
    if((sp1->boundingBox()).intersectsRect(sp2->boundingBox()))  
    {  
        label->setString("碰撞啦");  
    }else  
    {  
        label->setString("还是没有碰撞");  
    }  
  
}  
  
void HelloWorld::ccTouchEnded(cocos2d::CCTouch *touch, cocos2d::CCEvent *event)  
{  
      
}  
  
void HelloWorld::onEnter()  
{  
    CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);  
    CCLayer::onEnter();  
}  
  
  
void HelloWorld::onExit()  
{  
    CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);  
    CCLayer::onExit();  
}