c++ - 如何同时旋转和平移我的 Sprite ？ cocos2dx 3.2

Question

我尝试在 Sprite 的更新方法中执行RotateBy。它只是翻译。而且不旋转。谁能告诉我该怎么做？谢谢。

void CBall::Update(float dt)
{
  this->Start();
  auto action = RotateBy::create(dt,10);
  this->runAction(action);
 }

void CBall::Start()
{


  float currentX = getPositionX();
  float distance =  currentX + xOffset;
  float time = distance / _speedX;



  Vec2 destination = Vec2(distance,this->getPositionY());
  auto actionMove =  MoveTo::create(time,destination);
  this->runAction(actionMove);

  if(currentX > _screenWidth)
  {
        ReachedEndOfScreen();
  }


}

Answer 1

实际上你需要使用 Spawn action它将同时运行许多操作。

这是修改后的更新函数:

void CBall::Update(float dt)
{

  float currentX = getPositionX();
  float distance =  currentX + xOffset;
  float time = distance / _speedX;



  Vec2 destination = Vec2(distance,this->getPositionY());
  auto actionMove =  MoveTo::create(time,destination);

  if(currentX > _screenWidth)
  {
        ReachedEndOfScreen();
  }
  auto actionRotate = RotateBy::create(dt,10);
  this->runAction(Spawn::create(actionMove, actionRotate, nullptr));
 }

我内联了 Start() 成员函数，您可能会考虑在组合函数中重新组织 Update 实现 ;-)