001 /* 002 * 003 004 Licensed under the Apache License, Version 2.0 (the "License"); 005 you may not use this file except in compliance with the License. 006 You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010 Unless required by applicable law or agreed to in writing, software 011 distributed under the License is distributed on an "AS IS" BASIS, 012 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 See the License for the specific language governing permissions and 014 limitations under the License. 015 */ 016 017 package railo.runtime.img.filter; 018 /** 019 * A colormap with the colors of the spectrum. 020 */ 021 public class SpectrumColormap implements Colormap { 022 023 /** 024 * Construct a spcetrum color map. 025 */ 026 public SpectrumColormap() { 027 } 028 029 /** 030 * Convert a value in the range 0..1 to an RGB color. 031 * @param v a value in the range 0..1 032 * @return an RGB color 033 */ 034 public int getColor(float v) { 035 return Spectrum.wavelengthToRGB(380+400*ImageMath.clamp(v, 0, 1.0f)); 036 } 037 038 }