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/*
* Color_CMY.cc -- ePiX::CMY_Color functions
*
* This file is part of ePiX, a C++ library for creating high-quality
* figures in LaTeX
*
* Version 1.2.2
*
* Last Change: October 30, 2007
*
*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
#include "Color_Utils.h"
#include "Color.h"
#include "Color_CMY.h"
namespace ePiX {
CMY_Color::CMY_Color(double c, double m, double y)
: cyan(make_r(c,m,y)), magenta(make_g(c,m,y)), yellow(make_b(c,m,y)) { }
// private, no arg checking, bool unused
CMY_Color::CMY_Color(double c, double m, double y,
const bool arg)
: cyan(c), magenta(m), yellow(y) { }
CMY_Color::CMY_Color(const RGB_Densities& s)
: cyan(1-s.m_dens_red),
magenta(1-s.m_dens_green),
yellow(1-s.m_dens_blue) { }
Color_Base::RGB_Densities CMY_Color::to_rgb() const
{
// Use conventional formulas since our densities are already in [0,1]
return Color_Base::RGB_Densities(1-cyan, 1-magenta, 1-yellow);
}
CMY_Color* CMY_Color::clone() const
{
return new CMY_Color(*this);
}
CMY_Color& CMY_Color::filter(const Color_Base& color)
{
Color_Base::RGB_Densities s(color.to_rgb());
// filter in RGB; 1 - min(1-x, 1-y) = max(x, y)
cyan = std::max(cyan, 1-s.m_dens_red);
magenta = std::max(magenta, 1-s.m_dens_green);
yellow = std::max(yellow, 1-s.m_dens_blue);
return *this;
}
CMY_Color& CMY_Color::operator*= (double sc)
{
Color_Base::RGB_Densities s(to_rgb());
// scale in RGB
double r(sc*(s.m_dens_red));
double g(sc*(s.m_dens_green));
double b(sc*(s.m_dens_blue));
cyan = 1 - make_r(r, g, b);
magenta = 1 - make_g(r, g, b);
yellow = 1 - make_b(r, g, b);
return *this;
}
CMY_Color& CMY_Color::blend(const Color_Base& color, double d)
{
Color_Base::RGB_Densities s(color.to_rgb());
double wt(clip_to_unit(d));
// blending is a convex lin. comb., may as well do in CMY
cyan += wt*(1 - cyan - s.m_dens_red);
magenta += wt*(1 - magenta - s.m_dens_green);
yellow += wt*(1 - yellow - s.m_dens_blue);
return *this;
}
CMY_Color& CMY_Color::superpose(const Color_Base& color)
{
Color_Base::RGB_Densities s(color.to_rgb());
// add in RGB
cyan = 1 - clip_to_unit(1 - cyan + s.m_dens_red);
magenta = 1 - clip_to_unit(1 - magenta + s.m_dens_green);
yellow = 1 - clip_to_unit(1 - yellow + s.m_dens_blue);
return *this;
}
CMY_Color& CMY_Color::invert()
{
cyan = 1 - cyan;
magenta = 1 - magenta;
yellow = 1 - yellow;
return *this;
}
std::string CMY_Color::model() const
{
return "cmy";
}
std::string CMY_Color::name() const
{
std::ostringstream nm;
nm << "cmy_" << dtohex(cyan) << dtohex(magenta) << dtohex(yellow);
return nm.str();
}
std::vector<double> CMY_Color::densities() const
{
std::vector<double> val(3);
val.at(0) = rd(cyan);
val.at(1) = rd(magenta);
val.at(2) = rd(yellow);
return val;
}
} // end of namespace
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