旋转转盘 算法

/*  转盘旋转 先加速 后减速  inallTime 总共旋转时间  inallAngle 总共旋转角度  times 时间份数*/void HelloWorld::RotateTurntable(CCSprite* pSprite,float inallTime,float inallAngle,int times){CCArray* actions = CCArray::create();float inallRadian = (inallAngle / 180.0) * M_PI;float offsetTime = inallTime / times;float offsetAngle =  inallRadian / (atan(inallTime / 2) - atan(-inallTime / 2)); float startTime = - inallTime / 2;while (startTime <= inallTime / 2){float angle = (atan(startTime + offsetTime) - atan(startTime)) * offsetAngle * 180 / M_PI;startTime += offsetTime;CCActionInterval* actionTo = CCRotateBy::create(offsetTime, angle);actions->addObject(actionTo);}pSprite->runAction(CCSequence::create(actions));}