01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.reading.imageop;
18:
19: import java.awt.geom.AffineTransform;
20: import java.awt.image.AffineTransformOp;
21: import java.awt.image.WritableRaster;
22: import org.apache.avalon.framework.parameters.Parameters;
23: import org.apache.cocoon.ProcessingException;
24:
25: public class RotateOperation implements ImageOperation {
26:
27: private String prefix;
28: private boolean enabled;
29: private double angle;
30:
31: public void setPrefix(String prefix) {
32: this .prefix = prefix;
33: }
34:
35: public void setup(Parameters params) throws ProcessingException {
36: enabled = params
37: .getParameterAsBoolean(prefix + "enabled", true);
38: double angle = params.getParameterAsFloat(prefix + "angle",
39: 0.0f);
40: boolean useRadians = params.getParameterAsBoolean(prefix
41: + "use-radians", false);
42: if (!useRadians) {
43: this .angle = (angle / 180.0) * Math.PI;
44: } else {
45: this .angle = angle;
46: }
47: }
48:
49: public WritableRaster apply(WritableRaster image) {
50: if (!enabled) {
51: return image;
52: }
53: int width = image.getWidth();
54: int height = image.getHeight();
55: int x = width / 2;
56: int y = height / 2;
57:
58: WritableRaster newRaster1 = image
59: .createCompatibleWritableRaster(-x, -y, width, height);
60:
61: AffineTransform translate = AffineTransform
62: .getTranslateInstance(-x, -y);
63: AffineTransformOp op = new AffineTransformOp(translate,
64: AffineTransformOp.TYPE_BILINEAR);
65: op.filter(image, newRaster1);
66:
67: AffineTransform rotate = AffineTransform
68: .getRotateInstance(angle);
69: op = new AffineTransformOp(rotate,
70: AffineTransformOp.TYPE_BILINEAR);
71:
72: WritableRaster newRaster2 = image
73: .createCompatibleWritableRaster(-x, -y, width, height);
74: op.filter(newRaster1, newRaster2);
75:
76: return newRaster2;
77: }
78:
79: public String getKey() {
80: return "rotate:" + (enabled ? "enable" : "disable") + ":"
81: + angle + ":" + prefix;
82: }
83: }
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