Exception during rotation transform

Question

I am trying to rotate a Buffered Image using the following method:
BufferedImage image; //has been loaded correctly
BufferedImage image90; //destination for transform
AffineTransformOp rotate90=new AffineTransformOp (AffineTransform.getRotateInstance Math.toRadians (90)),AffineTransformOp.TYPE_BILINEAR);
image90=rotate90.filter (image,null);
This results in the exception:
Exception in thread "main" java.awt.image.RasterFormatException: Transformed wid
th (0) is less than or equal to 0.
at java.awt.image.AffineTransformOp.createCompatibleDestImage(Unknown So
urce)
at java.awt.image.AffineTransformOp.filter(Unknown Source)
at com.DMTool.ImageCoordinateTester.<init>(ImageCoordinateTester.java:63
at com.DMTool.ImageCoordinateTester.main(ImageCoordinateTester.java:118)
Why is this happening?

Answer 1

Using AffineTransformOp to rotate an image is an uphill struggle. I suggest doing it "manually":
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.swing.*;
public class RotateImage {
    public static void main(String[] args) throws IOException {
        URL url = new URL("http://today.java.net/jag/bio/JagHeadshot-small.jpg");
        BufferedImage original = ImageIO.read(url);
        GraphicsConfiguration gc = getDefaultConfiguration();
        BufferedImage rotated1 = tilt(original, -Math.PI/2, gc);
        BufferedImage rotated2 = tilt(original, +Math.PI/2, gc);
        BufferedImage rotated3 = tilt(original, Math.PI, gc);
        display(original, rotated1, rotated2, rotated3);
    public static BufferedImage tilt(BufferedImage image, double angle, GraphicsConfiguration gc) {
        double sin = Math.abs(Math.sin(angle)), cos = Math.abs(Math.cos(angle));
        int w = image.getWidth(), h = image.getHeight();
        int neww = (int)Math.floor(w*cos+h*sin), newh = (int)Math.floor(h*cos+w*sin);
        int transparency = image.getColorModel().getTransparency();
        BufferedImage result = gc.createCompatibleImage(neww, newh, transparency);
        Graphics2D g = result.createGraphics();
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g.translate((neww-w)/2, (newh-h)/2);
        g.rotate(angle, w/2, h/2);
        g.drawRenderedImage(image, null);
        return result;
    public static GraphicsConfiguration getDefaultConfiguration() {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        return gd.getDefaultConfiguration();
    public static void display(BufferedImage im1, BufferedImage im2, BufferedImage im3, BufferedImage im4) {
        JPanel cp = new JPanel(new GridLayout(2,2));
        addImage(cp, im1, "original");
        addImage(cp, im2, "rotate -PI/2");
        addImage(cp, im3, "rotate +PI/2");
        addImage(cp, im4, "rotate PI");
        JFrame f = new JFrame("RotateImage");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(cp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    static void addImage(Container cp, BufferedImage im, String title) {
        JLabel lbl = new JLabel(new ImageIcon(im));
        lbl.setBorder(BorderFactory.createTitledBorder(title));
        cp.add(lbl);