JPanel setOpaque(false) isn't transparent ?

Question

Hi,
I've set a JPanel as the only thing added to a JFrame container. I've set a picture to this JPanel by using the following code
          JPanel temp = new JPanel()
               public void paintComponent(Graphics g)
                     Dimension d = getSize();
                     g.drawImage(icon.getImage(), 0, 0, d.width, d.height, null);
                    setOpaque( false );
                    super.paintComponent(g);
          };Now I've added another JPanel onto this one. I've set its background to RED, so there is a red square over my picture on my JFrame. However I want this JPanel to be fully transparent, so you can't actually see it at all, so the picture behind it on the original JPanel shows through.
But when I use setOpaque(false), I just get a gray square instead of a red one, it doesn't show anything through at all.
Anyone know why this would be ?
Thanks

Answer 1

Here you go, the background picture is not shining through. You'll have to change the jpg name to whatever you want to use.
Thanks
import javax.swing.*;
import java.awt.*;
import javax.swing.border.*;
public class OneToOneChat extends JFrame
     protected JPanel leftZone, rightZone, totalZone;
     protected JTextPane bottomLeftZone, topLeftZone;
     protected JScrollPane topScroll, bottomScroll;
     public static void main(String args[])
          new OneToOneChat();          
     public OneToOneChat()
          setSize(400,400);          
          setTitle("My Opaque Problem");
          setLocation(200,200);
          setResizable(false);     
          Container con = getContentPane();
          leftZone = new JPanel(new BorderLayout());
          rightZone = new JPanel(new BorderLayout());          
          totalZone = new JPanel(new BorderLayout());               
          topLeftZone = new JTextPane();                              
          bottomLeftZone = new JTextPane();     
          topScroll = new JScrollPane(topLeftZone, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                                                 JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);          
                topScroll.setPreferredSize(new Dimension(250,150));          
          bottomScroll = new JScrollPane(bottomLeftZone,
                                       JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                                       JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);                                      
          bottomScroll.setPreferredSize(new Dimension(250,150));                                      
          rightZone.setOpaque(false);          
          rightZone.setBackground(Color.RED);          
          rightZone.setBorder( new LineBorder(Color.GREEN) );          
          rightZone.setPreferredSize(new Dimension(250,300));                                             
          leftZone.add(topScroll, "North");
          leftZone.add(bottomScroll,"South");
          totalZone.add(leftZone,"West");
          totalZone.add(rightZone,"East");
          final ImageIcon icon = new ImageIcon("ripple.jpg");                    
          JPanel temp = new JPanel()
               public void paintComponent(Graphics g)
                    Dimension d = getSize();
                    g.drawImage(icon.getImage(), 0, 0, d.width, d.height, null);
                    setOpaque( false );
                    super.paintComponent(g);
          temp.setBorder(new EmptyBorder(8,8,8,8));                    
          temp.add(totalZone);                                             
          con.add(temp);     
          pack();
          setVisible(true);
}