/* * Color_Utils.h -- Functions for manipulating color densities * * This file is part of ePiX, a C++ library for creating high-quality * figures in LaTeX * * Version 1.1.17 * * Last Change: September 14, 2007 * * * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 * Andrew D. Hwang * Department of Mathematics and Computer Science * College of the Holy Cross * Worcester, MA, 01610-2395, USA * * * ePiX is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * ePiX is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public * License for more details. * * You should have received a copy of the GNU General Public License * along with ePiX; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef EPIX_COLOR_UTILS #define EPIX_COLOR_UTILS #include namespace ePiX { double clip_to_unit(double t); // 0 if t<0, 1 if t>1, t otherwise double rd(double); // assumes arg is in [0,1] // represent a double in [0,1] by an 8-bit hex string std::string dtohex(double arg); // assumes arg>0 // saw2th:R -> [-2,2] is (1) a sawtooth function; (2) the identity on [-2,2] double saw2th(double x); /* * clippy(x): * 1.... ____ if (x >= 0) * .\ /. . return x <= 1 ? x : 1; * . \ / . . * 0......\____/ . . else * -2 -1 0 1 2 --> x return x >= -1 ? 0 : -1-x; */ double clippy(double x); double make_r(double r, double g, double b); double make_g(double r, double g, double b); double make_b(double r, double g, double b); } // end of namespace #endif /* EPIX_COLOR_UTILS */