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/*
* Color_Gray.cc -- ePiX::Gray_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 <ahwang -at- holycross -dot- edu>
* 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_Gray.h"
namespace ePiX {
Gray_Color::Gray_Color(double d)
: m_gray(clip_to_unit(d)) { }
Gray_Color::Gray_Color(const RGB_Densities& s)
: m_gray((1.0/3)*(s.m_dens_red+s.m_dens_green+s.m_dens_blue)) { }
Color_Base::RGB_Densities Gray_Color::to_rgb() const
{
return Color_Base::RGB_Densities(m_gray, m_gray, m_gray);
}
Gray_Color* Gray_Color::clone() const
{
return new Gray_Color(*this);
}
Gray_Color& Gray_Color::filter(const Color_Base& color)
{
Color_Base::RGB_Densities s(color.to_rgb());
m_gray = std::min(m_gray,
(1.0/3)*(s.m_dens_red+s.m_dens_green+s.m_dens_blue));
return *this;
}
Gray_Color& Gray_Color::operator*= (double c)
{
m_gray = clip_to_unit(c*m_gray);
return *this;
}
Gray_Color& Gray_Color::blend(const Color_Base& color, double d)
{
Color_Base::RGB_Densities s(color.to_rgb());
double wt(clip_to_unit(d));
m_gray += wt*((1.0/3)*(s.m_dens_red+s.m_dens_green+s.m_dens_blue)-m_gray);
return *this;
}
Gray_Color& Gray_Color::superpose(const Color_Base& color)
{
Color_Base::RGB_Densities s(color.to_rgb());
m_gray = clip_to_unit((1.0/3)*(s.m_dens_red +
s.m_dens_green +
s.m_dens_blue) + m_gray);
return *this;
}
Gray_Color& Gray_Color::invert()
{
m_gray = 1 - m_gray;
return *this;
}
std::string Gray_Color::model() const
{
return "rgb";
}
std::string Gray_Color::name() const
{
std::ostringstream nm;
nm << "gray_" << dtohex(m_gray);
return nm.str();
}
std::vector<double> Gray_Color::densities() const
{
std::vector<double> val(3);
val.at(0) = rd(m_gray);
val.at(1) = rd(m_gray);
val.at(2) = rd(m_gray);
return val;
}
} // end of namespace
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