summaryrefslogtreecommitdiff
path: root/graphics/epix/Color_CMYK.cc
diff options
context:
space:
mode:
Diffstat (limited to 'graphics/epix/Color_CMYK.cc')
-rw-r--r--graphics/epix/Color_CMYK.cc216
1 files changed, 216 insertions, 0 deletions
diff --git a/graphics/epix/Color_CMYK.cc b/graphics/epix/Color_CMYK.cc
new file mode 100644
index 0000000000..ef730a1998
--- /dev/null
+++ b/graphics/epix/Color_CMYK.cc
@@ -0,0 +1,216 @@
+/*
+ * Color_CMYK.cc -- ePiX::CMYK_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, 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
+ */
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include <cmath>
+
+#include "functions.h"
+
+#include "Color_Utils.h"
+#include "Color.h"
+#include "Color_CMYK.h"
+
+namespace ePiX {
+
+ // Behaves "classically" if c+k, m+k, y+k are in [0,1]
+ // Except as noted, CMYK methods enforce/preserve this condition
+ CMYK_Color::CMYK_Color(double c, double m, double y,
+ double k)
+ : cyan(make_r(c+k, m+k, y+k)),
+ magenta(make_g(c+k, m+k, y+k)),
+ yellow(make_b(c+k, m+k, y+k)),
+ black(min(min(cyan, magenta), yellow))
+ {
+ /* conventional RGB densities
+ double r(1 - min(1, c+k));
+ double g(1 - min(1, m+k));
+ double b(1 - min(1, y+k));
+ */
+ cyan -= black;
+ magenta -= black;
+ yellow -= black;
+ }
+
+ // private, no arg checking, bool unused
+ CMYK_Color::CMYK_Color(double c, double m,
+ double y, double k, const bool arg)
+ : cyan(c), magenta(m), yellow(y), black(k) { }
+
+
+ // black = min(c,m,y), following Uwe Kern's xcolor documentation
+ // V 1.11, 2004/05/09, p. 31
+ CMYK_Color::CMYK_Color(const RGB_Densities& s)
+ {
+ // may assume densities are in [0,1]
+ double c(1-s.m_dens_red), m(1-s.m_dens_green), y(1-s.m_dens_blue);
+
+ black = min(min(c, m), y);
+ cyan = c-black;
+ magenta = m-black;
+ yellow = y-black;
+ }
+
+ Color_Base::RGB_Densities CMYK_Color::to_rgb() const
+ {
+ // Use conventional formulas since our densities are already in [0,1];
+ // "min" for safety, should be unnecessary.
+ return Color_Base::RGB_Densities(1 - min(1.0, cyan + black),
+ 1 - min(1.0, magenta + black),
+ 1 - min(1.0, yellow + black));
+ }
+
+ CMYK_Color* CMYK_Color::clone() const
+ {
+ return new CMYK_Color(*this);
+ }
+
+ CMYK_Color& CMYK_Color::filter(const Color_Base& color)
+ {
+ Color_Base::RGB_Densities s(color.to_rgb()); // arg
+ Color_Base::RGB_Densities t(to_rgb()); // this
+
+ // filter in RGB
+ double c(1 - min(t.m_dens_red, s.m_dens_red));
+ double m(1 - min(t.m_dens_green, s.m_dens_green));
+ double y(1 - min(t.m_dens_blue, s.m_dens_blue));
+ black = min(min(c, m), y);
+
+ cyan = c-black;
+ magenta = m-black;
+ yellow = y-black;
+
+ return *this;
+ }
+
+
+ CMYK_Color& CMYK_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));
+
+ // Necessary b/c sc may not be in [0,1]
+ double c(1 - make_r(r, g, b));
+ double m(1 - make_g(r, g, b));
+ double y(1 - make_b(r, g, b));
+
+ black = min(min(c, m), y);
+ cyan = c-black;
+ magenta = m-black;
+ yellow = y-black;
+
+ return *this;
+ }
+
+ CMYK_Color& CMYK_Color::blend(const Color_Base& color, double d)
+ {
+ Color_Base::RGB_Densities s(color.to_rgb());
+ double wt(clip_to_unit(d));
+
+ double c((1-wt)*min(1.0, cyan+black) + wt*(1 - s.m_dens_red));
+ double m((1-wt)*min(1.0, magenta+black) + wt*(1 - s.m_dens_green));
+ double y((1-wt)*min(1.0, yellow+black) + wt*(1 - s.m_dens_blue));
+
+ black = min(min(c, m), y);
+ cyan = c-black;
+ magenta = m-black;
+ yellow = y-black;
+
+ return *this;
+ }
+
+ CMYK_Color& CMYK_Color::superpose(const Color_Base& color)
+ {
+ Color_Base::RGB_Densities s(color.to_rgb());
+ Color_Base::RGB_Densities t(to_rgb());
+
+ // add in RGB
+ double c(1 - clip_to_unit(t.m_dens_red + s.m_dens_red));
+ double m(1 - clip_to_unit(t.m_dens_green + s.m_dens_green));
+ double y(1 - clip_to_unit(t.m_dens_blue + s.m_dens_blue));
+
+ black = min(min(c, m), y);
+ cyan = c-black;
+ magenta = m-black;
+ yellow = y-black;
+
+ return *this;
+ }
+
+ CMYK_Color& CMYK_Color::invert()
+ {
+ Color_Base::RGB_Densities s(to_rgb());
+
+ // invert in RGB
+ double c(1 - s.m_dens_red);
+ double m(1 - s.m_dens_green);
+ double y(1 - s.m_dens_blue);
+
+ black = min(min(c, m), y);
+ cyan = c-black;
+ magenta = m-black;
+ yellow = y-black;
+
+ return *this;
+ }
+
+ std::string CMYK_Color::model() const
+ {
+ return "cmyk";
+ }
+
+ std::string CMYK_Color::name() const
+ {
+ std::ostringstream nm;
+
+ nm << "cmyk_" << dtohex(cyan) << dtohex(magenta) << dtohex(yellow)
+ << dtohex(black);
+ return nm.str();
+ }
+
+ std::vector<double> CMYK_Color::densities() const
+ {
+ std::vector<double> val(4);
+ val.at(0) = rd(cyan);
+ val.at(1) = rd(magenta);
+ val.at(2) = rd(yellow);
+ val.at(3) = rd(black);
+ return val;
+ }
+} // end of namespace