cocos2d-x 精灵移动

在HelloWorldScene.h中声明 p> 

p>class HelloWorld : public cocos2d::CCLayer

p>{

p>public:

p>    ......

p>    CCPoint convertToGL(CCSet *pTouches);

p>    virtual void ccTouchesMoved(CCSet *pTouches, CCEvent *event);

p>private:

p>    CCSprite *m_pSprite;

p>}; 

p> 

p>在HelloWorldScene.cpp中作如下声明

p> 

p> 

p> 

p>// on "init" you need to initialize your instance

p>bool HelloWorld::init()

p>{

p>    bool bRet = false;

p>    do

p>    {

p>        CC_BREAK_IF(! CCLayer::init());

p>        ......

p>        //MYCode

p>        m_pSprite = CCSprite::create("luffy.png");

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

p>        m_pSprite->setPosition(ccp(size.width / 2, size.height / 2));

p>        this->addChild(m_pSprite, 1); //note

p>        this->setTouchEnabled(true);

p> 

p>        bRet = true;

p>    }

p>    while (0);

p> 

p>    return bRet;

p>} 

p> 

p> 

p> 

p>CCPoint HelloWorld::convertToGL(CCSet *pTouches)

p>{

p>    if(pTouches)

p>    {

p>        CCSetIterator it = pTouches->begin();

p>        CCTouch *touch = (CCTouch *)(*it);

p>        CCPoint m_tBeginPos = touch->locationInView();

p>        m_tBeginPos = CCDirector::sharedDirector()->convertToGL(m_tBeginPos);

p>        return m_tBeginPos;

p>    }

p>    assert("pTouches is NULL");

p>}

p>void HelloWorld::ccTouchesMoved(CCSet *pTouches, CCEvent *event)

p>{

p>    CCPoint touch_pos = convertToGL(pTouches);

p>    CCPoint cur_pos = m_pSprite->getPosition();

p>    if(ccpDistance(touch_pos, cur_pos) != 0)

p>    {

p>        int dx = touch_pos.x - cur_pos.x;

p>        int dy = touch_pos.y - cur_pos.y;

p>        CCPoint vector = CCPoint::CCPoint(dx, dy);

p>        double dist = sqrt(dx * dx + dy * dy * 1.0); //note

p>        CCPoint unit_vector = CCPoint::CCPoint(dx / dist, dy / dist);

p>        int speed = 1;

p>        m_pSprite->setPosition(ccp(cur_pos.x + unit_vector.x * speed, cur_pos.y + unit_vector.y * speed));

p>    }

p>} 

p> 

p>程序实现的效果是

p> 

p>sprite会以规定的速度向鼠标所在位置靠近

p> 

p> 

p>