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    }