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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/epix/Color_CMY.cc
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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 1.1.17
+ *
+ * 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