title: how to add touch listener and get position of an actor in libgdx
body: <p>I have an actor which contains an image, I am adding this actor to my stage, with this code, this is my actor code</p>
  
  <pre><code>public O(sosgame game){
      super.setTouchable(Touchable.enabled);
      texture = Assets.o;
      setWidth(texture.getWidth());
      setHeight(texture.getHeight());
      setBounds(10, 180, texture.getWidth(), texture.getHeight());
  }
  </code></pre>
  
  <p>After I add my actor to my stage, I want to get its position in that screen, so I can move and drag my actor around the screen, I added input listener with this code, by the way, "o" is the instance name of my actor class</p>
  
  <pre><code>o.addListener(new InputListener(){
          @Override
          public boolean touchDown(InputEvent event, float x, float y, int pointer, int button){
              System.out.println(x + " " + y);
              return super.touchDown(event, x, y, pointer, button);
          }
      });
  </code></pre>
  
  <p>My problem is, when I touch my actor to drag it around the screen, I get the x and y values of my actor, not the actor's positon in screen, I should get the position of my actor inside the screen, how can I manage this, thank you</p>