public class Atlas {
        private static TextureAtlas atlas;
        private static PixmapPacker packer = new PixmapPacker(512, 512, Format.RGBA8888, 0, false);
        private static final HashMap<String, AtlasRegion> regions = new HashMap<String, AtlasRegion>();
 
        public static void generateAtlas() {
                packer.pack("tank", new Pixmap(Gdx.files.internal("images/tank.png")));
                packer.pack("cannonball", new Pixmap(Gdx.files.internal("images/cannonball.png")));
                packer.pack("explosion", new Pixmap(Gdx.files.internal("images/explosion.png")));
 
                atlas = packer.generateTextureAtlas(TextureFilter.Nearest, TextureFilter.Nearest, true);
                for (AtlasRegion r : atlas.getRegions()) regions.put(r.name, r);
        }
 
        public static void dispose() {
                atlas.dispose();
                packer.dispose();
        }
 
        public static AtlasRegion get(String name) {
                return regions.get(name);
        }
}