background image

[Ramiro Santos]

Hello,
I'm having some trouble putting a background image on a frame using SWING.
What I have done is to create a panel that takes the entire frame or dialog and then a JLabel which I add to the panel. This label only contains an image that occupies the background. Afterwords I add my other panels to the JLabel and make them trasparent. I find it strange to add panels to a jlabel and so I guess there must be some other way. Any ideas?
Second, I'm having some problems resizing the image in function of the size of the display. Someone know how this can be done?
Thanks a lot

[Carlos Failde]

import javax.swing.JPanel;
import java.awt.Image;
import java.awt.Graphics;
class BackgroundPanel extends JPanel
{
  protected Image bgImage;
  public BackgroundPanel(Image image)
  {
    super(true);
    bgImage = image;
    setOpaque(false);
  }
  public void paint(Graphics g)
  {
    g.drawImage(bgImage, 0 ,0 ,this);
    super.paint(g);
  }
} // BackgroundPanel

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.Toolkit;

import javax.swing.JLabel;
import javax.swing.JButton;
public class Background extends JFrame
{
  public Background()
  {
    super( "Background image" );
    Image img = Toolkit.getDefaultToolkit().getImage("img5.gif");
    JPanel backPanel = new BackgroundPanel(img);
    backPanel.setLayout( new FlowLayout() );
    // Populate the panel as normal
    backPanel.add( new JLabel("What do you think of my panel?") );
    backPanel.add( new JButton("Button") );
    getContentPane().add(backPanel);
    setSize( 794, 640 );
    setVisible(true);
  }
  public static void main( String args[] )
  {
    Background app = new Background();
    app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
} // end Background class