cocos2d-x實現node圓弧運動 (附原始碼)，cocos2d-xnode

cocos2d-x實現node圓弧運動 (附原始碼)，cocos2d-xnode

    紀錄下自己寫的東西！

標頭檔：

/*圓弧動作類*/class CCArcBy : public cocos2d::CCActionInterval{public://初始化圓弧動作類//duration: 動作類的期間//ptCenter: 圓弧的中心點//deltaAngle: 弧度的變化量，用正負來表示逆時針或順時針方向bool initWithDuration(float duration, const cocos2d::CCPoint& ptCenter, float deltaAngle);virtual CCObject* copyWithZone(cocos2d::CCZone* pZone);virtual void startWithTarget(cocos2d::CCNode *pTarget);virtual CCActionInterval* reverse(void);virtual void update(float time);public:static CCArcBy* create(float duration, const cocos2d::CCPoint& ptCenter, float deltaAngle);protected:cocos2d::CCPoint m_startPosition;cocos2d::CCPoint m_previousPosition;cocos2d::CCPoint m_ptCenter;float            m_fAngleDelta;};

實現檔案：

CCArcBy* CCArcBy::create(float duration, const CCPoint& ptCenter, float deltaAngle){CCArcBy* pRet= new CCArcBy();pRet->initWithDuration(duration, ptCenter, deltaAngle);pRet->autorelease();return pRet;}bool CCArcBy::initWithDuration(float duration, const CCPoint& ptCenter, float deltaAngle){if(CCActionInterval::initWithDuration(duration)){m_ptCenter= ptCenter;m_fAngleDelta= deltaAngle;return true;}return false;}CCObject* CCArcBy::copyWithZone(CCZone* pZone){CCZone* pNewZone = NULL;CCArcBy* pCopy = NULL;if(pZone && pZone->m_pCopyObject) {//in case of being called at sub classpCopy = (CCArcBy*)(pZone->m_pCopyObject);}else{pCopy = new CCArcBy();pZone = pNewZone = new CCZone(pCopy);}CCActionInterval::copyWithZone(pZone);pCopy->initWithDuration(m_fDuration, m_ptCenter, m_fAngleDelta);CC_SAFE_DELETE(pNewZone);return pCopy;}void CCArcBy::startWithTarget(CCNode *pTarget){CCActionInterval::startWithTarget(pTarget);m_previousPosition = m_startPosition = pTarget->getPosition();}CCActionInterval* CCArcBy::reverse(){return CCArcBy::create(m_fDuration, m_ptCenter, -m_fAngleDelta);}void CCArcBy::update(float time){CCLog("%f", time);if(m_pTarget){#if CC_ENABLE_STACKABLE_ACTIONSCCPoint currentPos = m_pTarget->getPosition();CCPoint diff = ccpSub(currentPos, m_previousPosition);m_startPosition = ccpAdd( m_startPosition, diff);CCPoint newPos =  m_ptCenter + ccpRotateByAngle(m_startPosition-m_ptCenter, CCPointZero, m_fAngleDelta*time);m_pTarget->setPosition(newPos);m_pTarget->setRotation(-CC_RADIANS_TO_DEGREES(m_fAngleDelta*time));m_previousPosition = newPos;#elsem_pTarget->setPosition(m_ptCenter + ccpRotateByAngle(m_startPosition-m_ptCenter, CCPointZero, m_fAngleDelta*time));#endif  // CC_ENABLE_STACKABLE_ACTIONS}}

cocos2d-x 代碼

擷取觸摸點螢幕座標位置，然後轉換到OpenGL座標系的位置，也就是遊戲邏輯層的座標系。
 
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codingnow.cn/cocos2d-x/1024.html