cocos2dx 矩形碰撞

bool HelloWorld::init()

{

    //////////////////////////////

    // 1. super init first

    if ( !CCLayer::init() )

    {

        return false;

    }

    CCLayerColor* colorLayer = CCLayerColor::create(ccc4(255, 0, 255, 0),480   ,320);



    

    addChild(colorLayer);

 

    CCLabelTTF * pLabel = CCLabelTTF::create("~还没有碰撞·~", "", 20);

    pLabel->setPosition(ccp(250,300 ));

    pLabel->setColor(ccc3(255, 255, 0));

    CCSize size = CCDirector::sharedDirector()->getWinSize();

    

    addChild(pLabel,1,900);

    

    CCSprite * sp1 =CCSprite::create("rect1.png");

    sp1->setPosition(ccp(250,200));

    addChild(sp1,0,921);



    CCSprite * sp2 =CCSprite::create("rect2.png");

    sp2->setPosition(ccp(250,100));

    addChild(sp2,0,922);

    return true;

}



  void HelloWorld:: onEnter()

{

    CCDirector ::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, false);

    CCLayer::onEnter();

}

  void HelloWorld::onExit()

{

    CCDirector ::sharedDirector()->getTouchDispatcher()->removeDelegate(this);

    CCLayer::onExit();

    

}

  bool HelloWorld::ccTouchBegan(CCTouch * pTouch, CCEvent * pEvent)

{

    CCSprite * sp1 = (CCSprite*)this->getChildByTag(921);

    sp1->setPosition(pTouch->getLocation());

    return true;

}

  void  HelloWorld::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)

{

    CCSprite * sp1 = (CCSprite*)this->getChildByTag(921);

    sp1->setPosition(pTouch->getLocation());

    

    CCSprite * sp2 = (CCSprite*)this->getChildByTag(922);

    CCLabelTTF * pLabel = (CCLabelTTF*)this->getChildByTag(900);

    

//    利用自定义判断矩形碰撞函数

//    if (this->isRectCollision(CCRectMake(sp1->getPositionX(), sp1->getPositionY(),sp1->getContentSize().width,sp1->getContentSize().height), CCRectMake(sp2->getPositionX(), sp2->getPositionY(), sp2->getContentSize().width, sp2->getContentSize().height))) {

//        pLabel->setString("碰撞了！");

//    } else {

//        pLabel->setString("~还没有碰撞·~");

//    

//    }

    

//    利用intersectsrect 函数检测碰撞

    if (sp1->boundingBox().intersectsRect(sp2->boundingBox())) {

         pLabel->setString("碰撞了！");    

    }else

        pLabel->setString("~还没有碰撞·~");

 

}

  void HelloWorld::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)

{

    CCLOG("GAME OVER");

}



bool HelloWorld::isRectCollision (CCRect rect1, CCRect rect2)

{

    float x1 = rect1.origin.x;

    float y1 = rect1.origin.y;

    float w1 = rect1.size.width;

    float h1 = rect1.size.height;

    float x2 = rect2.origin.x;

    float y2 = rect2.origin.y;

    float w2 = rect2.size.width;

    float h2 = rect2.size.height;

    

    if (x1+w1*0.5<x2-w2*0.5)  

        return false;

    else if (x1-w1*0.5>x2+w2*0.5)

        return false;

    else if (y1+h1*0.5<y2-h2*0.5)

        return false;

    else if (y1-h1*0.5>y2+h2*0.5)

        return false;

    

    return true;

}