Rotate an image in java

Question

I am looking to rotate an image. I have a JInternalFrame which contains a JLabel. The label contains the image. After the image has been rotated, I

Answer 1

Based on a previous example, but actually working with recent JDKs and in headless mode:

public static BufferedImage rotate(BufferedImage image, double angle) {
    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);
    BufferedImage result = deepCopy(image, false);
    Graphics2D g = result.createGraphics();
    g.translate((neww - w) / 2, (newh - h) / 2);
    g.rotate(angle, w / 2, h / 2);
    g.drawRenderedImage(image, null);
    g.dispose();
    return result;
}

public static BufferedImage deepCopy(BufferedImage bi, boolean copyPixels) {
    ColorModel cm = bi.getColorModel();
    boolean isAlphaPremultiplied = cm.isAlphaPremultiplied();
    WritableRaster raster = bi.getRaster().createCompatibleWritableRaster();
    if (copyPixels) {
        bi.copyData(raster);
    }
    return new BufferedImage(cm, raster, isAlphaPremultiplied, null);
}