Android - 复古壁球游戏 - 球拍/屏幕碰撞

我正在阅读“通过构建Android游戏学习Java”以及复古壁球游戏示例，我不知道如何实现球拍碰撞检测。球拍的运动使用onTouchEvent。我试图实现一个if语句，但是直到下一个触摸事件才会被检查，所以它无法正常工作。请帮忙。Android - 复古壁球游戏 - 球拍/屏幕碰撞

//Event that handles in which direction is the racket moving according to where is the user touching the screen 
    @Override 
    public boolean onTouchEvent(MotionEvent motionEvent) { 
     //gets the movement action without the pointers(ACTION_MASK) ??? -U: handles multitouch 

     switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) { 
      //what happens if user touches the screen and holds 
      case MotionEvent.ACTION_DOWN: 
       //if the screen was touched on the right side of the display than move the racket right 
       if (motionEvent.getX() >= (screenWidth/2) && racketPosition.x <= screenWidth) { 
        racketIsMovingLeft = false; 
        racketIsMovingRight = true; 
       } else if (motionEvent.getX() < (screenWidth/2) && racketPosition.x >= 0) { 
        racketIsMovingLeft = true; 
        racketIsMovingRight = false; 
       } else { 
        racketIsMovingLeft = false; 
        racketIsMovingRight = false; 
       } 

       break; 
      //when the user lets go of the screen the racket immediately stops moving 
      case MotionEvent.ACTION_UP: 
       racketIsMovingLeft = false; 
       racketIsMovingRight = false; 
       break; 
     } 
     return true; 
    }

来源

2016-03-30 P.Mac

好的。我找到了解决方案。我没有看到正确的代码 - 抱歉。我编辑了负责改变球拍racketPoint.x的作品。那就是：

public void updateCount() { 
     //change the racket position according to the movement 
     if (racketIsMovingRight && (racketPosition.x+racketWidth/2)<=screenWidth) { 
      racketPosition.x += racketSpeed; 
     } 

     if (racketIsMovingLeft && (racketPosition.x-racketWidth/2)>=0) { 
      racketPosition.x -= racketSpeed; 
     }

//代码其余

来源

2016-03-31 17:34:26

Android - 复古壁球游戏 - 球拍/屏幕碰撞

回答

相关问题