Modify the shape of image.

Question

Hello!
I have a problem with the images and i don't have idea to solve it. Maybe some of you have more idea than me...
I want to reduce the size of one side of the image. But only one, is not useful to resize all the image.
The effect that I want is to simulate like one side of the image is more near than the other to me when I have the image in front of me.
Can you understand me?
I dont know where to start with this... Any help will be very usefull.
Thanks a lot!
Merry christmas!

Answer 1

Here, play around with this code. Scaling one side of the image does indeed make it look like it's rotating, but the direction of rotation seems to be in the eye of the beholder. Notice, to achieve the scaling I us an AffineTransform object. You can probably add some mathematical shear to the AffineTransform to achieve a better effect.
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.geom.AffineTransform;
public class RotatingImageDemo extends JPanel implements Runnable{
    private String imagePath =
            "http://www.wiersma.org/project_images/java_duke.png";
    private BufferedImage img;
    private double scaleX;
    private double scaleIncrement;
    public RotatingImageDemo() {
        try{
            img = javax.imageio.ImageIO.read(new java.net.URL(imagePath));
            setPreferredSize(new java.awt.Dimension(img.getWidth()*2,
                                                    img.getHeight()));
            scaleX = 1.0;
            scaleIncrement = -.02;
        }catch(Exception e) {
            System.err.println("Could not load image for demonstration");
            e.printStackTrace();
            System.exit(0);
    public void addNotify() {
        super.addNotify();
        new Thread(this).start();
    public void run() {
        while(true) {
            try{Thread.sleep(30);}
            catch(InterruptedException e) {}
            repaint();
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        java.awt.Graphics2D g2d = (java.awt.Graphics2D) g;
        g2d.setRenderingHint(java.awt.RenderingHints.KEY_ANTIALIASING,
                             java.awt.RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(java.awt.RenderingHints.KEY_INTERPOLATION,
                     java.awt.RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        AffineTransform transform = new AffineTransform();
        double x = (getWidth()/2-(img.getWidth()*scaleX)/2f);
        transform.translate(x,0);
        //OR
        //transform.translate(getWidth()/2,0);
        scaleX += scaleIncrement;
        if(scaleX < -1) {
            scaleIncrement *= -1;
            scaleX = -1.0 + scaleIncrement;
        } else if(scaleX > 1) {
            scaleIncrement *= -1;
            scaleX = 1.0 + scaleIncrement;
        transform.scale(scaleX, 1);
        g2d.drawImage(img, transform, null);
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater( new Runnable() {
            public void run() {
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                RotatingImageDemo imageDemo= new RotatingImageDemo();
                f.setContentPane(imageDemo);
                f.pack();
                f.setVisible(true);
}