如何检测，如果一个精灵被感动了在Java中libGDX？ [英] How do I detect if a sprite was touched in Java libGDX?

问题描述

在过去的几天里，我一直在我的游戏（ Apopalypse ）移植到Android移动平台。我已经做了精灵的触摸检测谷歌快速搜索，但没有发现任何有用的。每个气球会弹出一次感动，我只需要检测，如果是感动。 这是我的球产卵code：

渲染（X，Y，宽度和高度被随机）：

 公共无效渲染（）{
    Y + = 2;
    balloon.setX（X）;
    balloon.setY（Y）;
    balloon.setSize（宽度，高度）;
    batch.begin（）;
    balloon.draw（批）;
    batch.end（）;
}
 

在产卵主要的游戏类：

  addBalloon（新气球（））;

公共静态无效addBalloon（气球B）{
    balloons.add（B）;
}
 

解决方案

这是我做到了，但根据您所使用的场景和可触及的元素，可以有这样做的稍微更优化的方式

 公共GameScreen实现了屏幕，InputProcessor
{

  @覆盖
  公共无效展（）
  {
      Gdx.input.setInputProcessor（本）;
  }

  @覆盖
  公共布尔触地（INT screenX，诠释screenY，INT指针，INT按钮）
  {
      浮pointerX = InputTransform.getCursorToModelX（WINDOWWIDTH，screenX）;
      浮pointerY = InputTransform.getCursorToModelY（WINDOWHEIGHT，screenY）;
      的for（int i = 0; I＆LT; balloons.size（）;我++）
      {
          如果（balloons.get（I）。载（pointerX，pointerY））
          {
              balloons.get（我）.setSelected（真正的）;
          }
      }
      返回true;
   }

   @覆盖
   公共布尔触（INT screenX，诠释screenY，INT指针，INT按钮）
   {
       浮pointerX = InputTransform.getCursorToModelX（WINDOWWIDTH，screenX）;
       浮pointerY = InputTransform.getCursorToModelY（WINDOWHEIGHT，screenY）;
       的for（int i = 0; I＆LT; balloons.size（）;我++）
       {
           如果（balloons.get（ⅰ）。载（pointerX，pointerY）及＆安培; balloons.get（ⅰ）.getSelected（））
           {
               balloons.get（ⅰ）.execute（）;
           }
           balloons.get（ⅰ）.setSelected（假）;
       }
       返回true;
    }

公共类InputTransform
{
    私有静态诠释appWidth = 480;
    私有静态诠释appHeight = 320;

    公共静态浮动getCursorToModelX（INT screenX，INT cursorX）
    {
        返程（（（浮点）cursorX）* appWidth）/（（浮点）screenX）;
    }

    公共静态浮动getCursorToModelY（INT screenY，INT粗略）
    {
        返程（（浮动）（screenY  - 走马））* appHeight /（（浮点）screenY）;
    }
}
 

In the past few days I've been porting my game (Apopalypse) to the Android Mobile platform. I've did a quick search on Google of sprite touch detection but didn't find anything helpful. Each balloon will pop once touched and I just need to detect if it's touched. Here's my balloon spawning code:

Rendering (x, y, width, and height are randomized):

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

Spawning in main game class:

addBalloon(new Balloon());

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

解决方案

This is how I did it, but depending on the scene you are using and the elements that can be touched, there can be slightly more optimized ways of doing this:

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) ; 
    }
}

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