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;
}