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/*
* 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 <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
* 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 <string>
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 */
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