Question

I’ll like to know if there is a way to create a ImageIcon that is the mirror of another ImageIcon.

Searching on Google, I found how to do it by using many AWT libraries.

Is there a way to do it with Swing ? If not, I’m still having troubles with the AWT method :

The ImageIcon I want to mirror is a animated gif (with contain a transparent color) and the AWT method returns a non-transparent (the transparent color is changed to opaque black) and non-animated gif.

Any ideas how to keep the animation and the transparent color?

Here is the AWT code I found (rangerStand being the original ImageIcon) :

 Image reversed = rangerStand.getImage();
 BufferedImage bufferedImage = new BufferedImage(reversed.getWidth(null), reversed.getHeight(null), BufferedImage.TYPE_INT_RGB);
 Graphics gb = bufferedImage.getGraphics();
 gb.drawImage(reversed, 0, 0, null);
 gb.dispose();

 AffineTransform tx = AffineTransform.getScaleInstance(-1, 1);
 tx.translate(-reversed.getWidth(null), 0);
 AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
 bufferedImage = op.filter(bufferedImage, null);
 ImageIcon lol = new ImageIcon(bufferedImage);
 this.sprite.setIcon(lol);

Thanks for reading.

Answer 1

You might want to try and subclassing the ImageIcon class and paint the image reversed. Try this piece of code, it might do the trick (i haven’t tried with animated transparent gif but it should work):

EDIT: I slightly changed the code and tested it with an animated gif. It works!

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;


/**
 * @author Savvas Dalkitsis
 */
public class Test {

    public static void main(String[] args) {
        JFrame f = new JFrame("Test");
        JLabel l = new JLabel();
        ImageIcon io = new MirrorImageIcon("test.gif");
        l.setIcon(io);
        f.getContentPane().add(l);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setVisible(true);
    }

}

@SuppressWarnings("serial")
class MirrorImageIcon extends ImageIcon {

    public MirrorImageIcon(String filename) {
        super(filename);
    }

    @Override
    public synchronized void paintIcon(Component c, Graphics g, int x, int y) {
        Graphics2D g2 = (Graphics2D)g.create();
        g2.translate(getIconWidth(), 0);
        g2.scale(-1, 1);
        super.paintIcon(c, g2, x, y);
    }

}