如何检测Java libGDX中是否触摸了精灵？

Question

在过去的几天里，我一直在将我的游戏（Apopalypse）移植到Android Mobile平台。我在Google上快速搜索了精灵触摸检测，但没有找到任何有用的东西。每个气球触摸一次就会弹出，我只需要检测它是否被触摸。这是我的气球生成代码：

渲染（x、y、宽度和高度随机）：

public void render() {
    y += 2;
    balloon.setX(x);
    balloon.setY(y);
    balloon.setSize(width, height);
    batch.begin();
    balloon.draw(batch);
    batch.end();
}

在主游戏类中产卵：

addBalloon(new Balloon());

public static void addBalloon(Balloon b) {
    balloons.add(b);
}

Answer 1

我做了一个小类，用于我的游戏检测雪碧是否被触摸

public class SpriteTouchable extends Sprite {

    public SpriteTouchable(Texture texture) {
        super(texture);
    }

    public SpriteTouchable(Sprite sprite) {
        set(sprite);
    }

    public static float xTrans(float x)
    {
        return x*Gdx.graphics.getWidth()/480;
    }

    public static float yTrans(float y)
    {
        return y*Gdx.graphics.getHeight()/320;
    }

    private boolean isTouched;

    /**
     * Type: Input Listener function
     * listen if this sprite button was pressed (touched)
     * @param marge : the extra touchable space out of sprite
     * @param x     : x position touched by user
     * @param y     : y position touched by user
     * 
     * return true  : Sprite touched
     * return false : Sprite not touched
     */
    public boolean isPressing(int marge,int x, int y) {
        if((x>getX() -xTrans(marge))&& x<getX() +getWidth()+xTrans(marge)) {
            if((y>getY() -yTrans(marge))&& y<getY()+getHeight()+yTrans(marge)) {
                return true;
            }
        }
        return false;
    }
}

 public boolean isTouched() {
    return isTouched;
 }

这里是我如何使用它

Gdx.input.setInputProcessor(new GameInputListener() {

            @Override
            public boolean touchUp(int screenX, int screenY, int pointer, int button) {

                return false;
            }

            @Override
            public boolean touchDown(int x, int yy, int pointer, int button) {
                int y = Gdx.graphics.getHeight() - yy;
                // if sprite + 10 of px marge is touched
                if(mySpriteTouchable.isPressing(10, x, y)) {
                    // sprite is touched down
                }
                return false;
            }
}

使用相同的逻辑，您可以检测精灵释放，也可以自定义精灵被触摸时的效果大小等等…

希望这是有帮助的！

Answer 2

我是这样做的，但是根据你使用的场景和可以触摸的元素，可以有稍微更优化的方法来做到这一点:

public GameScreen implements Screen, InputProcessor
{

  @Override
  public void show()
  {
      Gdx.input.setInputProcessor(this);
  }

  @Override
  public boolean touchDown(int screenX, int screenY, int pointer, int button)
  {
      float pointerX = InputTransform.getCursorToModelX(windowWidth, screenX);
      float pointerY = InputTransform.getCursorToModelY(windowHeight, screenY);
      for(int i = 0; i < balloons.size(); i++)
      {
          if(balloons.get(i).contains(pointerX, pointerY))
          {
              balloons.get(i).setSelected(true);
          }
      }
      return true;
   }

   @Override
   public boolean touchUp(int screenX, int screenY, int pointer, int button)
   {
       float pointerX = InputTransform.getCursorToModelX(windowWidth, screenX);
       float pointerY = InputTransform.getCursorToModelY(windowHeight, screenY);
       for(int i = 0; i < balloons.size(); i++)
       {
           if(balloons.get(i).contains(pointerX, pointerY) && balloons.get(i).getSelected())
           {
               balloons.get(i).execute();
           }
           balloons.get(i).setSelected(false);
       }
       return true;
    }

public class InputTransform
{
    private static int appWidth = 480;
    private static int appHeight = 320;

    public static float getCursorToModelX(int screenX, int cursorX) 
    {
        return (((float)cursorX) * appWidth) / ((float)screenX); 
    }

    public static float getCursorToModelY(int screenY, int cursorY) 
    {
        return ((float)(screenY - cursorY)) * appHeight / ((float)screenY) ; 
    }
}

Answer 3

在具有render方法的类中，use可以执行以下代码：

Vector3 touchPoint=new Vector3();

void update()
{
  if(Gdx.input.justTouched())
   {
    //unprojects the camera
    camera.unproject(touchPoint.set(Gdx.input.getX(),Gdx.input.getY(),0));
    if(balloon.getBoundingRectangles().contains(touchPoint.x,touchPoint.y))
     {
      // will be here when balloon will be touched
     }
    }
   }