//без масштабирования
 @Override
    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D)g;
        g2d.drawRect(30, 30, 60, 90);
        
    }
//с масштабированием
 @Override
    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D)g;
        AffineTransform at = new AffineTransform();
        at.setToScale(2, 3);
        g2d.setTransform(at);
        g2d.drawRect(30, 30, 60, 90);
        
    }