TouchTest 阅读学习笔记

class Ball : public CCSprite{    CCPoint m_velocity;public:    Ball(void);    virtual ~Ball(void);    float radius();    // 用来移动精灵对象    void move(float delta);    // 对与paddle做碰撞处理    void collideWithPaddle(Paddle* paddle);public:    void setVelocity(CCPoint velocity){m_velocity = velocity;}    CCPoint getVelocity(){return m_velocity;}public:// 绑定一个2d纹理    static Ball* ballWithTexture(CCTexture2D* aTexture);};// 这里我们绑定给定的图片纹理，在不用时自动释放精灵对象Ball* Ball::ballWithTexture(CCTexture2D* aTexture){    Ball* pBall = new Ball();    pBall->initWithTexture(aTexture);    pBall->autorelease();    return pBall;}void Ball::move(float delta){// 计算移动距离，并设置球的位置    this->setPosition( ccpAdd(getPosition(), ccpMult(m_velocity, delta)) );    // 若球的位置越过了左边、右边的可视区域边界，修正球的位置并把速度的x方向反向处理    if (getPosition().x > VisibleRect::right().x - radius())     {        setPosition( ccp( VisibleRect::right().x - radius(), getPosition().y) );        m_velocity.x *= -1;    }     else if (getPosition().x < VisibleRect::left().x + radius())     {        setPosition( ccp(VisibleRect::left().x + radius(), getPosition().y) );        m_velocity.x *= -1;    }}// 设定板子的边界，CCRect Paddle::rect(){    CCSize s = getTexture()->getContentSize();    return CCRectMake(-s.width / 2, -s.height / 2, s.width, s.height);}void Ball::collideWithPaddle(Paddle* paddle){// 获取板子的边界，精灵的默认锚点为(0.5,0.5),position就是中心点，这里还原为原来的paddle边界，取得边界值    CCRect paddleRect = paddle->rect();    paddleRect.origin.x += paddle->getPosition().x;    paddleRect.origin.y += paddle->getPosition().y;        float lowY  = paddleRect.getMinY();    float midY  = paddleRect.getMidY();    float highY = paddleRect.getMaxY();    float leftX  = paddleRect.getMinX();    float rightX = paddleRect.getMaxX();    // 球的x是否在碰撞范围内    if (getPosition().x > leftX && getPosition().x < rightX) {            bool hit = false;        float angleOffset = 0.0f;                 if (getPosition().y > midY && getPosition().y <= highY + radius())         {        // 碰下面的板子，设定角度偏移            setPosition( ccp(getPosition().x, highY + radius()) );            hit = true;            angleOffset = (float)M_PI / 2;        }        else if (getPosition().y < midY && getPosition().y >= lowY - radius())         {        // 碰撞上面的板子，设定角度偏移            setPosition( ccp(getPosition().x, lowY - radius()) );            hit = true;            angleOffset = -(float)M_PI / 2;        }                if (hit)         {        // 重定向速度方向和位置(下面怎么计算的不理解，物理知识弱爆了)CCPoint cp1 = ccpSub(paddle->getPosition(), getPosition());float angle1 = ccpToAngle(cp1);            float hitAngle = angle1 + angleOffset;                        float scalarVelocity = ccpLength(m_velocity) * 1.05f;float angle2 = ccpToAngle(m_velocity);            float velocityAngle = -angle2 + 0.5f * hitAngle;                        m_velocity = ccpMult(ccpForAngle(velocityAngle), scalarVelocity);        }    }    } typedef enum tagPaddleState {    kPaddleStateGrabbed,    kPaddleStateUngrabbed} PaddleState; class Paddle : public CCSprite, public CCTargetedTouchDelegate{    PaddleState        m_state;public:    Paddle(void);    virtual ~Paddle(void);    CCRect rect();    bool initWithTexture(CCTexture2D* aTexture);    virtual void onEnter();    virtual void onExit();    bool containsTouchLocation(CCTouch* touch);    virtual bool ccTouchBegan(CCTouch* touch, CCEvent* event);    virtual void ccTouchMoved(CCTouch* touch, CCEvent* event);    virtual void ccTouchEnded(CCTouch* touch, CCEvent* event);    virtual CCObject* copyWithZone(CCZone *pZone);    virtual void touchDelegateRetain();    virtual void touchDelegateRelease();    static Paddle* paddleWithTexture(CCTexture2D* aTexture);};// 给paddle增加绑定纹理Paddle* Paddle::paddleWithTexture(CCTexture2D* aTexture){    Paddle* pPaddle = new Paddle();    pPaddle->initWithTexture( aTexture );    pPaddle->autorelease();    return pPaddle;}// 设定未捕获状态bool Paddle::initWithTexture(CCTexture2D* aTexture){    if( CCSprite::initWithTexture(aTexture) )     {        m_state = kPaddleStateUngrabbed;    }    return true;}// 注册屏幕触摸处理事件onEnter :CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);onExit  :CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);// 若paddle包含数目点，设置捕获状态bool Paddle::ccTouchBegan(CCTouch* touch, CCEvent* event){    if (m_state != kPaddleStateUngrabbed) return false;    if ( !containsTouchLocation(touch) ) return false;    m_state = kPaddleStateGrabbed;    return true;}// 捕获paddle后，重新设置paddle位置void Paddle::ccTouchMoved(CCTouch* touch, CCEvent* event){    CCAssert(m_state == kPaddleStateGrabbed, "Paddle - Unexpected state!");        CCPoint touchPoint = touch->getLocation();    setPosition( ccp(touchPoint.x, getPosition().y) );}// 释放捕获，设置状态void Paddle::ccTouchEnded(CCTouch* touch, CCEvent* event){    CCAssert(m_state == kPaddleStateGrabbed, "Paddle - Unexpected state!");            m_state = kPaddleStateUngrabbed;} // 创建paddle的copy处理CCObject* Paddle::copyWithZone(CCZone *pZone){this->retain();return this;}void Paddle::touchDelegateRetain(){    this->retain();}void Paddle::touchDelegateRelease(){    this->release();}// 测试场景class PongScene : public TestScene{public:    PongScene();    virtual void runThisTest();    virtual void MainMenuCallback(CCObject* pSender);};class Ball;class PongLayer : public CCLayer{private:    Ball*       m_ball;    CCArray*    m_paddles;    CCPoint     m_ballStartingVelocity; public:    PongLayer();    ~PongLayer();    void resetAndScoreBallForPlayer(int player);    void doStep(float delta);};PongLayer::PongLayer(){    m_ballStartingVelocity = ccp(20.0f, -100.0f);    // 创建球精灵，并绑定纹理，设定速度值    m_ball = Ball::ballWithTexture( CCTextureCache::sharedTextureCache()->addImage(s_Ball) );    m_ball->setPosition( VisibleRect::center() );    m_ball->setVelocity( m_ballStartingVelocity );    addChild( m_ball );    m_ball->retain();    // 创建平板的纹理，绑定到精灵上    CCTexture2D* paddleTexture = CCTextureCache::sharedTextureCache()->addImage(s_Paddle);    CCArray *paddlesM = CCArray::createWithCapacity(4);        Paddle* paddle = Paddle::paddleWithTexture(paddleTexture);    paddle->setPosition( ccp(VisibleRect::center().x, VisibleRect::bottom().y + 15) );    paddlesM->addObject( paddle );        paddle = Paddle::paddleWithTexture( paddleTexture );    paddle->setPosition( ccp(VisibleRect::center().x, VisibleRect::top().y - kStatusBarHeight - 15) );    paddlesM->addObject( paddle );        paddle = Paddle::paddleWithTexture( paddleTexture );    paddle->setPosition( ccp(VisibleRect::center().x, VisibleRect::bottom().y + 100) );    paddlesM->addObject( paddle );        paddle = Paddle::paddleWithTexture( paddleTexture );    paddle->setPosition( ccp(VisibleRect::center().x, VisibleRect::top().y - kStatusBarHeight - 100) );    paddlesM->addObject( paddle );    // 将创建的4个精灵平板加入到数组中    m_paddles = (CCArray*)paddlesM->copy();    // 将平板对象加入到场景层中    CCObject* pObj = NULL;    CCARRAY_FOREACH(m_paddles, pObj)    {        paddle = (Paddle*)(pObj);        if(!paddle)            break;        addChild(paddle);    }    // 每帧调度doStep方法    schedule( schedule_selector(PongLayer::doStep) );}// 重置球数据，包括位置和速度void PongLayer::resetAndScoreBallForPlayer(int player){    m_ballStartingVelocity = ccpMult(m_ballStartingVelocity, -1.0f);    m_ball->setVelocity( m_ballStartingVelocity );    m_ball->setPosition( VisibleRect::center() );}void PongLayer::doStep(float delta){// 移动球    m_ball->move(delta);    // 检测球与平板的碰撞与否，并作相应的处理    Paddle* paddle = NULL;    CCObject* pObj = NULL;    CCARRAY_FOREACH(m_paddles, pObj)    {        paddle = (Paddle*)(pObj);        if(!paddle)            break;        m_ball->collideWithPaddle( paddle );    }    // 球的y值超过了可视区域，重新球数据    if (m_ball->getPosition().y > VisibleRect::top().y - kStatusBarHeight + m_ball->radius())        resetAndScoreBallForPlayer( kLowPlayer );    else if (m_ball->getPosition().y < VisibleRect::bottom().y-m_ball->radius())        resetAndScoreBallForPlayer( kHighPlayer );    // 每帧绘制球    m_ball->draw();}