As demontrated in the following program, the JButton (1st component), the
JLabel (2nd) component are transparent. However, the 3rd component which
is a transparent image is completely opaque, blocking out its rainy
background.

Regress the same program with jdk1.2 and that 3rd component is displayed
as transparent.

In order for this program to work, it also needs the 4 attached GIF files,
2 of which have transparent background.

This bug could be related to bug #4313754

Roger Pham 2/22/2000

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

public class Test extends JFrame {
    public static void main(String argv[]) {
        Test test = new Test();
        test.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.exit(0);
            }
        });
        test.pack();
        test.setSize(900, 900);
        test.setVisible(true);
    }

    Test() {
Container contentPane = new CustomContentPane();
JLabel view1 = new JLabel(new ImageIcon("gjMedium.gif"));
JLabel view2 = new JLabel(new ImageIcon("anjinAndMariko.gif"));
JLabel view3 = new JLabel(new ImageIcon("gjLarge.gif"));
JButton button = new JButton("Push me!");


JScrollPane sp1 = new JScrollPane(view1);
JScrollPane sp2 = new JScrollPane(view2);

setContentPane(contentPane);
sp1.setPreferredSize(new Dimension(250,250));
sp2.setPreferredSize(new Dimension(250,250));

contentPane.add(button);
contentPane.add(view3);
contentPane.add(sp1);
contentPane.add(sp2);

// explicitly set everything to be transparent, although this may not be necessary
button.setOpaque(false);
view1.setOpaque(false);
view2.setOpaque(false);
view3.setOpaque(false);
sp1.setOpaque(false);
sp2.setOpaque(false);
((JPanel) contentPane).setOpaque(false);

    }
}
class CustomContentPane extends JPanel {
    private ImageIcon rain = new ImageIcon("rain.gif");

    public CustomContentPane() {
setLayout(new FlowLayout());
    }
    public void paintComponent(Graphics g) {
int rainw = rain.getIconWidth();
int rainh = rain.getIconHeight();

Dimension size = getSize();

for(int row=0; row < size.height; row += rainh)
for(int col=0; col < size.width; col += rainw)
rain.paintIcon(this,g,col,row);
    }
}