Hi,
 newbie questions.
When I draw lines in the following
Ruler and RulerCursor paint methods
I draw them both at y=20 but they
do not line up.

When I change Ruler from
extends JPanel to extends Container
RulerCursor does not draw.

Will someone explain what I'm doing wrong?

Thanks,
Jeff Higgins

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

public class TestLinePosition extends JFrame {

 TestLinePosition() {

   Ruler vRule = new Ruler();
   RulerCursor vCursor = new RulerCursor();
   vRule.add(vCursor);
   MousePad mp = new MousePad();
   JScrollPane sPane = new JScrollPane();
   sPane.setViewportView(mp);
   sPane.setRowHeaderView(vRule);
   sPane.setViewportBorder(new BevelBorder(
                     BevelBorder.LOWERED));
   getContentPane().add(sPane);
 }

 class MousePad extends Component {}

 class Ruler extends JPanel {

   public Ruler() {
     setPreferredSize(new Dimension(20,1000));
   }
   public void paint(Graphics g) {
     super.paint(g);
     g.setColor(Color.black);
     g.drawLine(0, 20, 5, 20);
   }
 }

 public class RulerCursor extends Component {

   public RulerCursor() {
     setPreferredSize(new Dimension(20,1000));
   }
   public void paint(Graphics g) {
     super.paint(g);
     g.setColor(Color.red);
     g.drawLine(5, 20, 10, 20);
   }
 }

 public static void main(String[] args) {
   JFrame frame = new TestLinePosition();
   frame.pack();
   frame.setBounds(100, 100, 200, 200);
   frame.setVisible(true);
 }
}