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    }