libgdx ProgressBar rotation does not work

Question

The .setRotation() or .rotateBy() functions work on other Actor classes but not on ProgressBar objects.

Am I missing something here?

public void create() {
    stage = new Stage(new ScreenViewport());
    Gdx.input.setInputProcessor(stage);
    skin = new Skin();
    Pixmap pixmap = new Pixmap(10, 10, Pixmap.Format.RGBA8888);
    pixmap.setColor(Color.WHITE);
    pixmap.fill();
    skin.add("white", new Texture(pixmap));

    TextureRegionDrawable textureBar = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("blue.jpg")))); // Just a blue square
    ProgressBar.ProgressBarStyle barStyle = new ProgressBar.ProgressBarStyle(skin.newDrawable("white", Color.DARK_GRAY), textureBar);
    progressBar = new ProgressBar(0,10,0.5f,false, barStyle);
    progressBar.setPosition(10, 10);
    progressBar.setSize(290, progressBar.getPrefHeight());
    progressBar.setAnimateDuration(2);
    progressBar.setValue(5);
    progressBar.setRotation(45); // Should rotate the bar

    stage.addActor(progressBar);
}

Also if I call .getRotation() I get whatever I set it previously so I'm not sure what is the problem here.

Answer 1

Most UI widgets cannot be transformed directly , due to performance reasons. There are still getters/setters for rotation though, this can be confusing.

However it is possible to put them in a Group and transform the group.

ProgressBar progressBar = ...
Group g = new Group();
g.addActor(progressBar);
g.setRotation(45);

stage.addActor(g);