Rotate and translate images with AffineTransform

Staying on the same subject as my previous posts, the next example will help you rotate and translate any BufferedImage.

public BufferedImage rotateImage(BufferedImage rotateImage) {
AffineTransformOp op = null;

try {

   AffineTransform tx = new AffineTransform();

   //Rotate 90º
   tx.rotate(Math.toRadians(90), rotateImage.getWidth()
              / 2.0, rotateImage.getHeight() / 2.0);

   AffineTransform translationTransform;
   translationTransform = findTranslation(tx, rotateImage);

   tx.preConcatenate(translationTransform);

   op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);

   } catch (Exception e) {
      //Do something here
   }

   return op.filter(rotateImage, null);
}

The function that finds the Translation:

private AffineTransform findTranslation(AffineTransform at, BufferedImage bi) {
   Point2D p2din, p2dout;

   p2din = new Point2D.Double(0.0, 0.0);
   p2dout = at.transform(p2din, null);
   double ytrans = p2dout.getY();

   p2din = new Point2D.Double(0, bi.getHeight());
   p2dout = at.transform(p2din, null);
   double xtrans = p2dout.getX();

   AffineTransform tat = new AffineTransform();
   tat.translate(-xtrans, -ytrans);

   return tat;
}

And finally ... import this:

import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;

All done :)