diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/epix/Color_CMY.cc |
Initial commit
Diffstat (limited to 'graphics/epix/Color_CMY.cc')
-rw-r--r-- | graphics/epix/Color_CMY.cc | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/graphics/epix/Color_CMY.cc b/graphics/epix/Color_CMY.cc new file mode 100644 index 0000000000..085823acc2 --- /dev/null +++ b/graphics/epix/Color_CMY.cc @@ -0,0 +1,160 @@ +/* + * Color_CMY.cc -- ePiX::CMY_Color functions + * + * This file is part of ePiX, a C++ library for creating high-quality + * figures in LaTeX + * + * Version 1.1.17 + * + * Last Change: September 13, 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., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <sstream> +#include <string> +#include <vector> + +#include <cmath> + +#include "functions.h" + +#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 = max(cyan, 1-s.m_dens_red); + magenta = max(magenta, 1-s.m_dens_green); + yellow = 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 |