001/* 002 * BioJava development code 003 * 004 * This code may be freely distributed and modified under the 005 * terms of the GNU Lesser General Public Licence. This should 006 * be distributed with the code. If you do not have a copy, 007 * see: 008 * 009 * http://www.gnu.org/copyleft/lesser.html 010 * 011 * Copyright for this code is held jointly by the individual 012 * authors. These should be listed in @author doc comments. 013 * 014 * For more information on the BioJava project and its aims, 015 * or to join the biojava-l mailing list, visit the home page 016 * at: 017 * 018 * http://www.biojava.org/ 019 * 020 * Created on Aug 3, 2007 021 */ 022package org.biojava.nbio.structure.gui.util.color; 023 024/** 025 * Performs a sqrt transform on input before passing the values off to another 026 * colorMapper. 027 * 028 * For instance, to map [0^2, 10^2] to a rainbow gradient, use 029 * 030 * new LogColorMapper(GradientMapper.getGradientMapper(GradientMapper.RAINBOW_GRADIENT, 0, 10)) 031 * 032 * @author Spencer Bliven 033 * 034 */ 035public class SqrtColorMapper extends ContinuousColorMapperTransform { 036 037 /** 038 * Creates a new SqrtColorMapper. 039 * @param sqrtspaceMapper 040 */ 041 public SqrtColorMapper(ContinuousColorMapper sqrtspaceMapper) { 042 super(sqrtspaceMapper); 043 } 044 045 /** 046 * Return sqrt(value). 047 * If value is negative, return the color corresponding to negative infinity. 048 * 049 * @param value Value to be mapped 050 * @return sqrt(value), or NEGATIVE_INFINITY 051 * @see org.biojava.nbio.structure.gui.util.color.ContinuousColorMapper#getColor(double) 052 */ 053 @Override 054 public double transform(double value) { 055 double sqrtValue = Double.NEGATIVE_INFINITY; 056 if(value >= 0) 057 sqrtValue = Math.sqrt(value); 058 059 return sqrtValue; 060 } 061 062}