学习笔记之cocos2dx2.1.1实现多个精灵的拖动

场景中存在多个精灵，需要移动以安放在合适的位置，简单的move会出现精灵区域重叠的情况，稍微在ccTouchBegan函数中做修改就可以解决这个问题，每次移动当前ccTouchBegan点击下的那个精灵。需要开启ccTouchBegan和ccTouchMoved的代理，不然单单的setTouchEnabled(true);是没有效果的，还是直接看代码吧

bool HelloWorld::init()
{
	bool bRet = false;
	do 
	{
		CC_BREAK_IF(! CCLayer::init());
		CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
			"CloseNormal.png",
			"CloseSelected.png",
			this,
			menu_selector(HelloWorld::menuCloseCallback));
		CC_BREAK_IF(! pCloseItem);
		pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 500));

		CCMenuItemImage *pSaveItem = CCMenuItemImage::create(
			"save_1.png",
			"save_2.png",
			this,
			menu_selector(HelloWorld::menuSaveCallback));
		CC_BREAK_IF(! pSaveItem);
		pSaveItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 100, 100));

		CCMenu* pMenu = CCMenu::create(pCloseItem,pSaveItem, NULL);
		pMenu->setPosition(CCPointZero);
		CC_BREAK_IF(! pMenu);
		this->addChild(pMenu, 1);

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

		CCSprite* bg = CCSprite::create("bg.png");
		CC_BREAK_IF(!bg);
		bg->setPosition(ccp(s.width/2,s.height/2));
		this->addChild(bg);
		//////////////////////////////////////////////////////////////////////////
		TagCount = 0;

		CCSprite* sprite=CCSprite::create("1.png"); 
		CC_BREAK_IF(!sprite); 
		sprite->setPosition(ccp(100,200));
		this->addChild(sprite,1,++TagCount); 

		CCSprite* sprite2=CCSprite::create("2.png"); 
		CC_BREAK_IF(!sprite2); 
		sprite2->setPosition(ccp(500,200));
		this->addChild(sprite2,2,++TagCount); 

		CCDirector* pDirector = CCDirector::sharedDirector();
		pDirector->getTouchDispatcher()->addTargetedDelegate(this, 0, true);

		setTouchEnabled(true);
		bRet = true;
	} while (0);
	return bRet;
}
bool HelloWorld::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent) 
{ 
	int tag ;
	for (tag = 1;tag<=TagCount;tag++)
	{
		CCSprite* sprite= (CCSprite*)this->getChildByTag(tag); 

		CCPoint touchPoint = pTouch->getLocationInView();
		touchPoint = CCDirector::sharedDirector()->convertToGL( touchPoint );

		CCRect rc1 = sprite->boundingBox();
		if (rc1.containsPoint(touchPoint))
		{ 
			pSprite = sprite;
			return true;
		}
	}
	return false; 
} 
void HelloWorld::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent) 
{
	CCPoint beginPoint=pTouch->getLocationInView(); 
	beginPoint=CCDirector::sharedDirector()->convertToGL(beginPoint); 

	CCPoint endPoint=pTouch->getPreviousLocationInView(); 
	endPoint=CCDirector::sharedDirector()->convertToGL(endPoint); 

	CCPoint offSet =ccpSub(beginPoint,endPoint); 
	CCPoint toPoint=ccpAdd(pSprite->getPosition(),offSet); 
	pSprite->setPosition(toPoint); 
}