In Java 7, transparent GIF doesn't animate properly - animation

Question

So, I'm having an issue with a program. I have a GIF that's transparent. The animation works properly, except that instead of showing one image at a time, it sort of stacks the images on top of each other. I tried overriding the paintIcon method of the ImageIcon class to clear the canvas, but that didn't work either. ANy thoughts?
My code:
public class GifRunner extends JPanel {
JLabel label;
public GifRunner() {
super();
label = new JLabel();
ImageIcon icon = new ImageIcon(getClass().getResource("/animation.gif");
label.setIcon(icon);
add(label);
}
public static void main(String[] args) {
JFrame frame = new JFrame("");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GifRunner panel = new GifRunner();
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);
}
}
Any help would be much appreciated

Answer 1

you can override the ImageIcon's paintIcon function and manually clear the canvas:
class ClearImageIcon extends ImageIcon{
public ClearImageIcon(String filename){super(filename);}
#Override
public synchronized void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D)g.create();
g2.setBackground(new Color(0,0,0,0));
g2.clearRect(0, 0, getIconWidth(), getIconHeight());
super.paintIcon(c, g2, x, y);
}
}
it will draw every frame nicely on to the screen.

Answer 2

Works fine for me...
Windows 7, Java 7.
Original
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class AnimatedGifTest {
public static void main(String[] args) {
new AnimatedGifTest();
}
public AnimatedGifTest() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
ImageIcon image = new ImageIcon("C:\\Users\\swhitehead\\Documents\\My Dropbox\\Ponies\\appleture_animated_gif_by_inkwell_pony-d4uggao.gif");
JLabel label = new JLabel(image);
add(label);
}
}
}