LibGdx animation using TextureAtlas

Question

I'm trying to load an explosion animation. The animations consists of 16 frames, all saved in the file Explosion.png. In my game, all the images are stored in a texture atlas pack.

So first i got the region that i needed from the class Assets.java

public class Explosion {
    public final AtlasRegion explosion;
    public Explosion (TextureAtlas atlas){
        explosion = atlas.findRegion(Constants.EXPLOSION);
    }
}

Then in my class which will create the explosion, I have the following code:

public Particles(Vector2 position){
    this.position = position;
    startTime = TimeUtils.nanoTime();

    Array<TextureRegion> explosionAnimationTexture = new Array<TextureRegion>();

    TextureRegion region = Assets.instance.explosion.explosion;
    Texture explosionTexture = region.getTexture();

    int ROW = 4;  // rows of sprite sheet image
    int COLUMN = 4;
    TextureRegion[][] tmp = TextureRegion.split(explosionTexture, explosionTexture.getWidth() / COLUMN, explosionTexture.getHeight() / ROW);
    TextureRegion[] frames = new TextureRegion[ROW * COLUMN];
    int elementIndex = 0;
    for (int i = 0; i < ROW; i++) {
        for (int j = 0; j < COLUMN; j++) {
            explosionAnimationTexture.add(tmp[i][j]);
            frames[elementIndex++] = tmp[i][j];
        }
    }

    explosion = new Animation(EXPLOSION_FRAME_DURATION,explosionAnimationTexture , Animation.PlayMode.LOOP_PINGPONG);
}

I'm using 4x4 since I have 16 frame. And inside the render method i got the following:

public void render(SpriteBatch batch){
    float elapsedTime = MathUtils.nanoToSec * (TimeUtils.nanoTime() - startTime);
    TextureRegion walkLoopTexture = explosion.getKeyFrame(elapsedTime);

    batch.draw(
            walkLoopTexture.getTexture(),
            position.x,
            position.y,
            0,
            0,
            walkLoopTexture.getRegionWidth(),
            walkLoopTexture.getRegionHeight(),
            0.3f,
            0.3f,
            0,
            walkLoopTexture.getRegionX(),
            walkLoopTexture.getRegionY(),
            walkLoopTexture.getRegionWidth(),
            walkLoopTexture.getRegionHeight(),
            false,
            false);

}

The animation is working, however the images are loading from the whole atlas file, and not only Explosion.png as specified in step 1.

You need to use Animation and add each of the frames into it AFAIK — user8063991
The region.getTexture() gets the whole texture for the atlas. You should use region.findRegion("spritesheetname") to get just the region for the name. — dfour
@dfour I'm already doing that in a subclass ( explosion = atlas.findRegion(Constants.EXPLOSION);), then fetching the result. — Nassif Bousaba
Try replace walkLoopTexture.getTexture(), with just walkLoopTexture. — dfour
@dfour I have to because the draw method requires a Texture. walkLoopTexture is a textureregion. Sorry for the naming confusion — Nassif Bousaba

Abhishek Aryan Abhishek Aryan · Accepted Answer · 2017-08-03T15:14:18

Code inside your Particles class :

TextureRegion region = Assets.instance.explosion.explosion;
TextureRegion[][] tmp = TextureRegion.split(explosionTexture, explosionTexture.getWidth() / COLUMN, explosionTexture.getHeight() / ROW);

replace with :

TextureRegion[][] tmp = region.split(region.getRegionWidth()/COLUMN,region.getRegionHeight()/ROW);

And

draw your Animation using textureRegion instead of his texture so choose appropriate method signature of SpriteBatch for drawing textureRegion.

LibGdx animation using TextureAtlas

1 Answers