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/*
* Color.h -- ePiX::Color class and helpers
*
* This file is part of ePiX, a C++ library for creating high-quality
* figures in LaTeX
*
* Version 1.2.2
* Last Change: November 12, 2007
*
*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
* 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
*/
/*
* This file defines the ePiX Color user interface:
* operator*= Modify intensity
* blend(Color, double) Color mixing
* filter(Color) Apply us as a filter
* superpose(Color) Add colors, clip intensities
* invert() Color negative
*
* - Named primary constructors
*
* Scaling and filtering are implemented by converting to the filter's
* color model. Color model conversions come from the LaTeX xcolor
* package documentation, V 1.11 (2044/05/09) by Uwe Kern.
*/
#ifndef EPIX_COLOR
#define EPIX_COLOR
#include <string>
#include <vector>
namespace ePiX {
class Color_Base;
class Color {
public:
Color();
Color(const Color_Base*);
Color(const Color_Base&);
Color(const Color&);
Color& operator= (const Color&);
~Color();
const Color_Base* operator->() const;
double alpha() const;
bool is_unset() const;
Color filter(const Color&) const;
Color& operator*= (double c); // scale the intensity
Color& blend(const Color&, double);
Color& superpose(const Color&);
Color& invert();
Color& alpha(double);
std::string model() const;
std::string name() const;
std::vector<double> densities() const;
private:
Color_Base* m_color;
double m_alpha;
}; // end of class Color
Color operator* (double, const Color&);
const bool operator== (const Color&, const Color&);
const bool operator!= (const Color&, const Color&);
// for palette ordering
const bool operator< (const Color&, const Color&);
/*
* * * Primary color functions in the global namespace * * *
*
* A primary color constructor accepts a numerical argument, which is
* reduced mod 4, then interpreted as a color density as follows:
* d = -2 or 2 : white
* d = -1: full anti-saturation
* d = 0: black
* d = 1: full saturation (default)
*
* The primary changes continuously, and linearly on each interval
* [-2,-1], [-1,0], [0,1], and [1,2].
*
* Example:
* Red(0.3) = rgb(0.3, 0, 0) = Red(-3.7)
* Red(1.3) = rgb(1,0.3,0.3) = Red(-2.7)
* Red(2.3) = rgb(0.7, 1, 1) = Red(-1.7)
* Red(3.3) = rgb(0,0.7,0.7) = Red(-0.7)
*/
Color RGB(double r=0, double g=0, double b=0);
Color CMY(double c=1, double m=1, double y=1);
Color CMYK(double c=1, double m=1, double y=1,
double k=0); // void same as CMYK(0,0,0,1);
Color Gray(double d=0);
Color Red(double d=1);
Color Green(double d=1);
Color Blue(double d=1);
Color White(double d=1);
Color Black(double d=1);
Color Cyan(double d=1);
Color Magenta(double d=1);
Color Yellow(double d=1);
Color CMY_White(double d=1);
Color CMY_Black(double d=1);
Color CyanK(double d=1);
Color MagentaK(double d=1);
Color YellowK(double d=1);
Color CMYK_White(double d=1);
Color CMYK_Black(double d=1);
// color separation
Color C_Process(double d=1);
Color M_Process(double d=1);
Color Y_Process(double d=1);
Color K_Process(double d=1);
// "conversion filters"
Color Neutral();
Color RGB_Neutral();
Color CMY_Neutral();
Color CMYK_Neutral();
Color Gray_Neutral();
} // end of namespace
#endif /* EPIX_COLOR */
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