01: /*
02: * Copyright (c) 2005-2008 Substance Kirill Grouchnikov. All Rights Reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * o Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: *
10: * o Redistributions in binary form must reproduce the above copyright notice,
11: * this list of conditions and the following disclaimer in the documentation
12: * and/or other materials provided with the distribution.
13: *
14: * o Neither the name of Substance Kirill Grouchnikov nor the names of
15: * its contributors may be used to endorse or promote products derived
16: * from this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20: * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
27: * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
28: * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30: package org.jvnet.substance.painter.noise;
31:
32: /**
33: * Noise filter that produces median-beak distribution. For values 0.0 and 1.0
34: * the resulting value is 1.0, for value 0.5 the resulting value is 0.0. The
35: * filter signature is that of the downward-pointing beak. This class is part of
36: * officially supported API.
37: *
38: * @author Kirill Grouchnikov
39: */
40: public class MedianBeakFilter implements NoiseFilter {
41: /*
42: * (non-Javadoc)
43: *
44: * @see org.jvnet.substance.painter.noise.NoiseFilter#apply(double, double,
45: * double, double)
46: */
47: public double apply(double x, double y, double z, double origValue) {
48: return Math.sqrt(Math.abs(2 * origValue - 1));
49: }
50: }
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