Libgdx 动画不播放或循环播放答案

【问题标题】：Libgdx animation doesn't play or loopLibgdx 动画不播放或循环播放
【发布时间】：2021-07-19 03:09:52
【问题描述】：

我制作了一个游戏，其中一只乌龟必须收集海星，但是当我添加行走动画时它不起作用。发生的情况是它只显示第一帧，整个动画没有播放，我没有收到任何错误。

我正在使用不同的图像来加载动画

这是我的动画方法-

// used to load animation from multiple files
public Animation loadAnimationFromFiles(String[] fileNames, float frameDuration, boolean loop)
{
    int fileCount = fileNames.length;
    Array<TextureRegion> textureArray = new Array<TextureRegion>();
    for (int n = 0; n < fileCount; n++)
    { 
        String fileName = fileNames[n];
        Texture texture = new Texture( Gdx.files.internal(fileName) );
        texture.setFilter( TextureFilter.Linear, TextureFilter.Linear );
        textureArray.add( new TextureRegion( texture ) );
        
    }
    
    Animation anim = new Animation(frameDuration, textureArray);
    if (loop) {
    //setAnimation(anim);
        System.out.println("animation run");
        anim.setPlayMode(Animation.PlayMode.LOOP);
    }
    else {
        anim.setPlayMode(Animation.PlayMode.NORMAL);
    }
    if (animation == null) {
        System.out.println("animation null");
        setAnimation(anim);
    }
    return anim;
}

这是我使用动画的乌龟类-

public class Turtle extends BaseActor
{
public Turtle(float x, float y, Stage s)
{
    super(x, y, s);
    
    String[] fileNames = {
        "turtle2.png",
        "turtle.png",
    };

    loadAnimationFromFiles(fileNames, 0.1f, true);
    
}

public void act(float dt)
{   
    super.act(dt);
    if (Gdx.input.isKeyPressed(Input.Keys.LEFT))
        this.moveBy(-5,0);
    if (Gdx.input.isKeyPressed(Input.Keys.RIGHT))
        this.moveBy(5,0);
    if (Gdx.input.isKeyPressed(Input.Keys.UP))
        this.moveBy(0,5);
    if (Gdx.input.isKeyPressed(Input.Keys.DOWN))
        this.moveBy(0,-5);
    
}

}

【问题讨论】：

标签： java animation libgdx

【解决方案1】：

您刚刚创建了动画，但从未使用过它。要使用动画，您需要通过测量经过的增量时间从中获取纹理。

您的海龟类应该看起来更像这样：

public class Turtle extends BaseActor
{

   private Animation<TextureRegion> animation;//store the animation in a field to use it
   private float time;//use a timer for the animation to be played

   public Turtle(float x, float y, Stage s)
   {
       super(x, y, s);
    
       String[] fileNames = {
           "turtle2.png",
           "turtle.png",
       };

       //store the animation to the field instead of just creating it
       animation = loadAnimationFromFiles(fileNames, 0.1f, true);
       //set the animations timer
       time = 0;
    }

    public void act(float dt)
    {   
        //increase the time since the animation was started by the delta time
        time += dt;
        //tell the animation how much time passed, so it can give you the current animation texture
        TextureRegion texture = animation.getKeyFrame(time);
        
        //TODO draw texture

        //I assume the super.act call also draws a texture; that should be deleted to not draw over the already created texture
        super.act(dt);
        if (Gdx.input.isKeyPressed(Input.Keys.LEFT))
            this.moveBy(-5,0);
        if (Gdx.input.isKeyPressed(Input.Keys.RIGHT))
            this.moveBy(5,0);
        if (Gdx.input.isKeyPressed(Input.Keys.UP))
            this.moveBy(0,5);
        if (Gdx.input.isKeyPressed(Input.Keys.DOWN))
            this.moveBy(0,-5);
    
    }
}

【讨论】：