AffineTransform to rotate a bufferedimage?

Question

Hi,
I have a bufferedImage that updates on a thread, but I want to rotate the entire image 90 degrees. I have (in my paint component method)
Graphics2D g2 = (Graphics2D)g;
bi_ = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
g2 = bi_.createGraphics();
//some drawing...
AffineTransform atx = new AffineTransform();
atx.rotate(Math.toRadians(90));
g2.setTransform(atx);
g2.dispose();
g.drawImage(bi_, 0, 0, null);but it doesn't rotate the image. Am I using AffineTransform wrong?
Thanks
Edited by: ryanj318 on Jun 23, 2009 5:47 PM

Answer 1

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.*;
public class SpinImage extends JPanel {
    BufferedImage image;
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        if(image == null) image = getImage();
        double cx = image.getWidth()/2.0;
        double cy = image.getHeight()/2.0;
        AffineTransform at =
            AffineTransform.getRotateInstance(Math.PI/2, cx, cy);
        g2.drawRenderedImage(image, at);
    private BufferedImage getImage() {
        int w = getWidth();
        int h = getHeight();
        int type = BufferedImage.TYPE_INT_RGB;
        BufferedImage image = new BufferedImage(w, h, type);
        Graphics2D g2 = image.createGraphics();
        g2.setBackground(Color.pink);
        g2.clearRect(0,0,w,h);
        g2.setFont(g2.getFont().deriveFont(24f));
        g2.setPaint(Color.blue);
        g2.drawString("SpinImage", 100, 130);
        g2.dispose();
        return image;
    public Dimension getPreferredSize() {
        return new Dimension(300, 240);
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new SpinImage());
        f.pack();
        f.setLocation(200,200);
        f.setVisible(true);
}