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);
    }

}

Answer 2

No idea on how to solve the problem with native Swing or AWT - although Java supports GIF89a with transparency and animation. I guess, you have to unpack the GIF89a, mirror the animation images one-by-one and repack. There s at least one library that you could give a try: gif4j light

Answer 3

First of all, the image support in Swing is based on AWT, so "doing it with Swing" does not make much sense.

Except for that, you have two problems: Keeping the transparency and keeping the animation. The first issue is simple to solve. With BufferedImage.TYPE_INT_RGB, you are creating a new BufferedImage without an alpha channel (transparency information). If you change the type to BufferedImage.TYPE_INT_ARGB, that issue should be fixed.

The animation bit is quite a bit harder. An Image or a BufferedImage does not really support animation, but using an animated GIF as a source and displaying the Image in a GUI component causes a kind of non-disclosed interaction between the image and the GUI component, causing the animation to be shown. The way you copy the original image to a BufferedImage will probably cause the single frame, which is currently displayed to be copied into the BufferedImage. It s more than two lines of code, but you can use the ImageReader in javax.imageio to read each single frame of the animated GIF and ImageWriter to create a new animated GIF from the mirrored images.

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