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:
21: import java.awt.image.AffineTransformOp;
22: import java.awt.image.WritableRaster;
23:
24: import org.apache.avalon.framework.parameters.Parameters;
25:
26: import org.apache.cocoon.ProcessingException;
27:
28: public class RotateOperation implements ImageOperation {
29: private String m_Prefix;
30: private boolean m_Enabled;
31: private double m_Angle;
32:
33: public void setPrefix(String prefix) {
34: m_Prefix = prefix;
35: }
36:
37: public void setup(Parameters params) throws ProcessingException {
38: m_Enabled = params.getParameterAsBoolean(m_Prefix + "enabled",
39: true);
40: double angle = params.getParameterAsFloat(m_Prefix + "angle",
41: 0.0f);
42: boolean useRadians = params.getParameterAsBoolean(m_Prefix
43: + "use-radians", false);
44: if (!useRadians)
45: m_Angle = (angle / 180.0) * Math.PI;
46: else
47: m_Angle = angle;
48: }
49:
50: public WritableRaster apply(WritableRaster image) {
51: if (!m_Enabled)
52: return image;
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(m_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:" + (m_Enabled ? "enable" : "disable") + ":"
81: + m_Angle + ":" + m_Prefix;
82: }
83: }
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