Painting on a JPanel inside a JScrollPane doesn't paint in the right location

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So I have a JPanel that's inside a JScrollPane. Now I am trying to paint something on the JPanel, but it's always in same spot. I can scroll in all directions but it's not moving. Whatever I paint on the JPanel does not get scrolled.

I already tried:

1. A custom JViewPort

2. switching between Opaque = true and Opaque = false

Also I considered overriding the paintComponent method of the JPanel but that would be really hard to implement in my code.

public class ScrollPanePaint{

public ScrollPanePaint() {
    JFrame frame = new JFrame();
    final JPanel panel = new JPanel();
    panel.setPreferredSize(new Dimension(1000, 1000));
    //I tried both true and false
    panel.setOpaque(false);
    JScrollPane scrollPane = new JScrollPane(panel);
    frame.add(scrollPane);
    frame.setSize(200, 200);
    frame.setVisible(true);
    //To redraw the drawing constantly because that wat is happening in my code aswell because
    //I am creating an animation by constantly move an image by a little
    new Thread(new Runnable(){
        public void run(){
            Graphics g = panel.getGraphics();
            g.setColor(Color.blue);
            while(true){
                g.fillRect(64, 64, 3 * 64, 3 * 64);
                panel.repaint();
            }
        }
    }).start();
}

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            new ScrollPanePaint();
        }
    });
}

}

The mistake I make is probably very easy to fix, but I just can't figure out how.

asked 22 secs ago

Roan

1