/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cocoon.reading.imageop;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.WritableRaster;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.cocoon.ProcessingException;
public class RotateOperation
implements ImageOperation {
private String prefix;
private boolean enabled;
private double angle;
public void setPrefix( String prefix ) {
this.prefix = prefix;
}
public void setup( Parameters params )
throws ProcessingException {
enabled = params.getParameterAsBoolean( prefix + "enabled", true);
double angle = params.getParameterAsFloat( prefix + "angle", 0.0f );
boolean useRadians = params.getParameterAsBoolean( prefix + "use-radians", false);
if( ! useRadians ) {
this.angle = ( angle / 180.0 ) * Math.PI;
} else {
this.angle = angle;
}
}
public WritableRaster apply( WritableRaster image ) {
if( ! enabled ) {
return image;
}
int width = image.getWidth();
int height = image.getHeight();
int x = width / 2;
int y = height / 2;
WritableRaster newRaster1 = image.createCompatibleWritableRaster(-x, -y, width, height );
AffineTransform translate = AffineTransform.getTranslateInstance( -x, -y );
AffineTransformOp op = new AffineTransformOp( translate, AffineTransformOp.TYPE_BILINEAR );
op.filter( image, newRaster1 );
AffineTransform rotate = AffineTransform.getRotateInstance( angle );
op = new AffineTransformOp( rotate, AffineTransformOp.TYPE_BILINEAR );
WritableRaster newRaster2 = image.createCompatibleWritableRaster(-x, -y, width, height );
op.filter( newRaster1, newRaster2 );
return newRaster2;
}
public String getKey() {
return "rotate:"
+ ( enabled ? "enable" : "disable" )
+ ":" + angle
+ ":" + prefix;
}
}