移動身體onSceneTouchEvent

Question

我想將身體從其初始位置移動到onTouchEvent x和y。問題在於身體向錯誤的方向移動。有人能告訴我我的錯誤在哪裏嗎？

這是我到目前爲止的代碼：

public boolean onPlayerTouchEvent(final Scene pScene, 
        final TouchEvent pSceneTouchEvent) { 

      final float pValueX = pSceneTouchEvent.getX(); 
      final float pValueY = pSceneTouchEvent.getY(); 
      final float rotation = (float) Math.atan2(pValueX, pValueY); 
      final float xComp = (float) Math.sin(rotation); 
      final float yComp = (float) Math.cos(rotation); 

      if (pSceneTouchEvent.isActionDown()) { 
        this.mPlayerBody.setLinearVelocity(new Vector2(xComp, yComp)); 
      } else if (pSceneTouchEvent.isActionMove()) { 

      } else if (pSceneTouchEvent.isActionUp()) { 
        this.mPlayerBody.setLinearVelocity(new Vector2(0, 0)); 
      } 

      return true; 
    } 

Answer 1

您的旋轉（角度）的錯誤公式。

請嘗試下面的代碼。 // touchX和敏感的全局變量

public boolean onPlayerTouchEvent(final Scene pScene, 
       final TouchEvent pSceneTouchEvent) { 

    if (pSceneTouchEvent.isActionDown()) { 
     touchX = pSceneTouchEvent.getX(); 
     touchY = pSceneTouchEvent.getY(); 

    } else if (pSceneTouchEvent.isActionMove()) { 
     final float pValueX = pSceneTouchEvent.getX()-touchX ; 
     final float pValueY = pSceneTouchEvent.getY()- touchY; 
     final float rotation = (float) Math.atan2(pValueY, pValueX); 
     final float xComp = (float) Math.cos(rotation); 
     final float yComp = (float) Math.sin(rotation); 
     this.myBall.getBallBody().setLinearVelocity(
       new Vector2(xComp, yComp)); 
    } else if (pSceneTouchEvent.isActionUp()) { 
     myBall.getBallBody().setLinearVelocity(new Vector2(0, 0)); 
    } 

     return true; 
}