问如何在创建对象但不可见相机时更改计时器中的精灵？
EN

Stack Overflow用户

提问于 2016-07-25 19:33:58

回答 2查看 49关注 0票数 0

如果对象是不可见的相机，我想在一段时间后改变它的精灵。我有一个创建对象的方法

 private void spawnRaindrop() {
    Rectangle raindrop = new Rectangle();
    raindrop.x = MathUtils.random(0, Drop.WIDTH - 100);
    raindrop.y = Drop.WIDTH;
    raindrop.width = 100;
    raindrop.height = 100;
    raindrops.add(raindrop);
    lastDropTime = TimeUtils.nanoTime();
}

I have a method that changes the time interval through the sprites:
 public void timerSpriteChange() {

    Timer timer = new Timer();
    timer.schedule(new Timer.Task() {
                       @Override
                       public void run() {


                               index = ((int) (Math.random() * MAX_SPRITES));



                       }
                   }

            , 0, 5);

}

在这里，我检查并比较时间，然后调用该方法

  if (TimeUtils.nanoTime() - lastDropTime > 1000000000) {

            spawnRaindrop();

        }

OrthographicCamera摄像头；

java

android

libgdx

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回答 2

Stack Overflow用户

发布于 2016-07-26 10:04:01

你有没有想过创建一个像'raindropVisible‘这样的布尔值，当你创建对象并生成它时，它会将布尔值设置为真，当游戏处理掉它时，它会将布尔值设置为假。然后让计时器检查布尔值是否为false，如果是，则更改子画面？

票数 0

Stack Overflow用户

发布于 2016-07-27 07:53:36

如果您还没有这样做，那么您的Raindrop类应该扩展libGDX Actor类，然后使用act和draw方法来处理所有事情。

此代码未经测试

class Raindrop extends Actor
{
    boolean onScreen = true;
    float offScreenTimer = 0.0f;
    final float OFFSCREENLLIMIT = 10.0f; // change as required

    // here you will also define all the other variables you need
    // such as movement speed, position information, sprite/image, etc

    public void act()
    {
        if ( onScreen )
        {
          if ( isOnScreen() ) // you'll need to create this method yourself!
          {
              // do all your on screen 'acting' here (movement, etc), but not the drawing
          }
          else
          {
              onScreen = false;
              setVisible(false);
          }
        }
        else
        {
            offScreenTimer += Gdx.gl.getDelta(); // <= this is most likely wrong, you'll need to double check the method name
            if ( offScreenTimer > OFFSCREENLLIMIT )
            {
                // here add all the code you need to change the image
                // and reset its movement and position values
                setVisible(true);
            }
        }
    }

    public void draw()
    {
        // add your code to handle the drawing of the image here
    }
}