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 grayscale colormap. Black is 0, white is 1. 020 */ 021 public class GrayscaleColormap implements Colormap { 022 023 public GrayscaleColormap() { 024 } 025 026 /** 027 * Convert a value in the range 0..1 to an RGB color. 028 * @param v a value in the range 0..1 029 * @return an RGB color 030 */ 031 public int getColor(float v) { 032 int n = (int)(v*255); 033 if (n < 0) 034 n = 0; 035 else if (n > 255) 036 n = 255; 037 return 0xff000000 | (n << 16) | (n << 8) | n; 038 } 039 040 }