如何停止绘制在libgdx一个SpriteBatch动画？ [英] How to stop drawing a SpriteBatch animation in libgdx?

问题描述

您好我有一个Libgdx动画spritebatch。只播放一次，当它完成我想要停止绘制它，所以它不会出现在屏幕上。我有一个检查一个布尔值，如果它仍然是活的，即动画，当动画使用完它被设置为false isAnimationFinished但是它停留在屏幕上，我不知道为什么即使日志打印显示其更改为false完成。有没有人有任何想法，这是为什么？感谢你的帮助。下面code是从我的渲染方法。

  Gdx.gl.glClear（GL10.GL_COLOR_BUFFER_BIT）; //这神秘的线清除屏幕。
     布尔活着= TRUE;
     stateTime + = Gdx.graphics.getDeltaTime（）; //＃15
        设置currentFrame = walkAnimation.getKeyFrame（stateTime，FALSE）; //＃16
        spriteBatch.begin（）;
        spriteBatch.draw（菜单，0，0，Gdx.graphics.getWidth（），Gdx.graphics.getHeight（））;
        如果（活着）
        spriteBatch.draw（设置currentFrame，50,50）;
        如果（walkAnimation.isAnimationFinished（stateTime））
        活着= FALSE;
        的System.out.println（活的）;
        spriteBatch.end（）;
        stage.draw（）;
 

解决方案

我看到的问题是，您总是是在年初宣布一个新的布尔变量活着，并设置活着真：

 布尔活着= TRUE;
 

，然后所有的绘图发生和在所有的你，如果你的动画完成活着设置为false：

 如果（walkAnimation.isAnimationFinished（stateTime））
    活着= FALSE;
 

==>这是为时已晚，因为在这之后你不这样做什么了的本地的变量。

---

例如，你可以检查是否活着应该在一开始是真或假的权利，并相应设置的值，例如像：

 布尔活着= TRUE;
 如果（walkAnimation.isAnimationFinished（stateTime））{
    活着= FALSE;
 }
 //绘图code以下..
 

另外，您可以让活着的字段，而不是一个局部变量。

Hi I have a spritebatch animation in Libgdx. It only plays once and when it is finished I want to stop drawing it so it doesn't appear on the screen. I have a boolean that checks if it is still alive i.e. animating and it is set to false when the animation is finished using isAnimationFinished however it stays on the screen and I am not sure why even though a log print shows it changing to false on finish. Does anyone have any idea why this is? Thanks for your help. The following code is from my render method.

Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); // This cryptic line clears the screen.
     boolean alive = true;
     stateTime += Gdx.graphics.getDeltaTime();           // #15
        currentFrame = walkAnimation.getKeyFrame(stateTime, false);  // #16
        spriteBatch.begin();
        spriteBatch.draw(menu, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        if (alive)
        spriteBatch.draw(currentFrame,50,50);
        if(walkAnimation.isAnimationFinished(stateTime))
        alive = false;
        System.out.println(alive);
        spriteBatch.end();
        stage.draw();

解决方案

The problem I see is that you always declare a new boolean variable "alive" and set the alive to true at the beginning:

boolean alive = true;

and then all your drawing is happening and after all that you set alive to false if your animation is finished:

if(walkAnimation.isAnimationFinished(stateTime))
    alive = false;

==> That is too late, because after this you don't do anything anymore with this local variable.

---

You could for example check if "alive" should be true or false right at the beginning and set its value accordingly, like for example:

 boolean alive = true;
 if(walkAnimation.isAnimationFinished(stateTime)) {
    alive = false;
 }
 //your drawing code below..

alternatively you could make "alive" a field instead of a local variable.

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