How to add a button with a Stage class that does not implement the Screen interface?

Question

I have my own Libgdx class that does not implement the Screen Interface. I control my camera movement. It's an orthographic camera whose viewport width is WorldWidth and viewport height is WorldHeight. I am trying to add a button via the Stage class. I am able to add it and I see that its drawn, but since I don't implement the screen interface I call stage.draw() on my render() method, not on the render(float delta) method that seems to be required by the Screen interface. For comparison purposes, I draw a sprite whose size is (0.25fcamera.viewportWidth,0.25fcamera.viewportHeight). However, this sprite is not drawing when I call stage.draw(). The button draws but it seems very small even though I set its size to (0.25fcamera.viewportWidth,0.25fcamera.viewportHeight). Here's the code on how I add my button class:

stage1= new Stage();
btn = new Button(new SpriteDrawable(new Sprite(new Texture("texone.png"))),
new SpriteDrawable(new Sprite(new Texture("textwo.png"))));
btn.addListener(new ClickListener(){
public void clicked(InputEvent event, float x, float y){ }
});
btn.setBounds(0f,0f,0.25f*camera.viewportWidth,0.25f*camera.viewportHeight);
btn.setPosition(0f,100f);
stage1.add(btn);
Gdx.input.setInputProcessor(stage1);
//a few lines down to my render() method
@Override
public void render(){
//.... more regular code that goes in method
batch.begin();
//more lines of code that draw my sprites
stage1.draw();
batch.end();
}

What I want to know is why is the button so small and why isn't my other sprite drawing? Perhaps there is a way to add my orthographic camera to my stage1 object. And, if I add my orthographic camera to my stage1 object, how should I update my stage1 viewport on the resize method? Please advise.

thank you

You can move stage1.draw() after batch.end(), it has it's own batch begin and end. When you create your stage, you can specify a viewport which will create a camera for it. — Barodapride
Man you are awesome! thanks for the right answer. @Barodapride — i_o

Khachatur Badalyan Khachatur Badalyan · Accepted Answer · 2015-11-17T06:39:54

I don't see that you set a projection matrix for batch. Do you call this function?

batch.setProjectionMatrix(camera.combined);

you should do it in render function

How to add a button with a Stage class that does not implement the Screen interface?

1 Answers