/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.capedwarf.images.transform;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import com.google.appengine.api.images.Transform;
/**
* @author <a href="mailto:marko.luksa@gmail.com">Marko Luksa</a>
*/
public class RotateTransform extends CapedwarfTransform {
public RotateTransform(Transform transform) {
super(transform);
}
@Override
public BufferedImage applyTo(BufferedImage image) {
AffineTransform tx = AffineTransform.getQuadrantRotateInstance(getNumOfQuadrants());
translateCoordinates(tx, image.getWidth(), image.getHeight());
AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
return op.filter(image, null);
}
private int getNumOfQuadrants() {
return getDegrees() / 90;
}
private void translateCoordinates(AffineTransform tx, int imageWidth, int imageHeight) {
switch (getDegrees()) {
case 90:
tx.translate(0, -imageHeight);
break;
case 180:
tx.translate(-imageWidth, -imageHeight);
break;
case 270:
tx.translate(-imageWidth, 0);
break;
}
}
private int getDegrees() {
return (Integer) getFieldValue("degrees");
}
}