source: lemon-0.x/lemon/color.h @ 2174:f9e43b5cc617

/* -*- C++ -*-
 *
 * This file is a part of LEMON, a generic C++ optimization library
 *
 * Copyright (C) 2003-2006
 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 * (Egervary Research Group on Combinatorial Optimization, EGRES).
 *
 * Permission to use, modify and distribute this software is granted
 * provided that this copyright notice appears in all copies. For
 * precise terms see the accompanying LICENSE file.
 *
 * This software is provided "AS IS" with no warranty of any kind,
 * express or implied, and with no claim as to its suitability for any
 * purpose.
 *
 */

#ifndef LEMON_COLOR_H
#define LEMON_COLOR_H

#include <sys/time.h>

#include<iostream>
#include<fstream>
#include<sstream>
#include<algorithm>
#include<vector>

#include <ctime>
#include <cmath>

#include<lemon/bits/invalid.h>
#include<lemon/xy.h>
#include<lemon/maps.h>
#include<lemon/bezier.h>


///\ingroup misc
///\file
///\brief Tools to manage RGB colors.
///
///\author Alpar Juttner

namespace lemon {

  /// \addtogroup misc
  /// @{

///Data structure representing RGB colors.

///Data structure representing RGB colors.
///\ingroup misc
class Color
{
  double _r,_g,_b;
public:
  ///Default constructor
  Color() {}
  ///Constructor
  Color(double r,double g,double b) :_r(r),_g(g),_b(b) {};
  ///Set the red component
  double & red() {return _r;}
  ///Return the red component
  const double & red() const {return _r;}
  ///Set the green component
  double & green() {return _g;}
  ///Return the green component
  const double & green() const {return _g;}
  ///Set the blue component
  double & blue() {return _b;}
  ///Return the blue component
  const double & blue() const {return _b;}
  ///Set the color components
  void set(double r,double g,double b) { _r=r;_g=g;_b=b; };
};

  /// White color constant
  extern const Color WHITE;  
  /// Black color constant
  extern const Color BLACK;
  /// Red color constant
  extern const Color RED;
  /// Green color constant
  extern const Color GREEN;
  /// Blue color constant
  extern const Color BLUE;
  /// Yellow color constant
  extern const Color YELLOW;
  /// Magenta color constant
  extern const Color MAGENTA;
  /// Cyan color constant
  extern const Color CYAN;
  /// Grey color constant
  extern const Color GREY;
  /// Dark red color constant
  extern const Color DARK_RED;
  /// Dark green color constant
  extern const Color DARK_GREEN;
  /// Drak blue color constant
  extern const Color DARK_BLUE;
  /// Dark yellow color constant
  extern const Color DARK_YELLOW;
  /// Dark magenta color constant
  extern const Color DARK_MAGENTA;
  /// Dark cyan color constant
  extern const Color DARK_CYAN;

///Maps <tt>int</tt>s to different \ref Color "Color"s

///This map assigns one of the predefined \ref Color "Color"s
///to each <tt>int</tt>. It is possible to change the colors as well as their
///number. The integer range is cyclically mapped to the provided set of colors.
///
///This is a true \ref concept::ReferenceMap "reference map", so you can also
///change the actual colors.

class Palette : public MapBase<int,Color>
{
  std::vector<Color> colors;
public:
  ///Constructor

  ///Constructor
  ///\param have_white indicates whether white is
  ///amongst the provided color (\c true) or not (\c false). If it is true,
  ///white will be assigned to \c 0.
  ///\param num the number of the allocated colors. If it is \c 0,
  ///the default color configuration is set up (26 color plus the white).
  ///If \c num is less then 26/27 then the default color list is cut. Otherwise
  ///the color list is filled repeatedly with the default color list.
  ///(The colors can be changed later on.)
  Palette(bool have_white=false,int num=0)
  {
    do {
      if(have_white) colors.push_back(Color(1,1,1));

      colors.push_back(Color(0,0,0));
      colors.push_back(Color(1,0,0));
      colors.push_back(Color(0,1,0));
      colors.push_back(Color(0,0,1));
      colors.push_back(Color(1,1,0));
      colors.push_back(Color(1,0,1));
      colors.push_back(Color(0,1,1));
      
      colors.push_back(Color(.5,0,0));
      colors.push_back(Color(0,.5,0));
      colors.push_back(Color(0,0,.5));
      colors.push_back(Color(.5,.5,0));
      colors.push_back(Color(.5,0,.5));
      colors.push_back(Color(0,.5,.5));
      
      colors.push_back(Color(.5,.5,.5));
      colors.push_back(Color(1,.5,.5));
      colors.push_back(Color(.5,1,.5));
      colors.push_back(Color(.5,.5,1));
      colors.push_back(Color(1,1,.5));
      colors.push_back(Color(1,.5,1));
      colors.push_back(Color(.5,1,1));
      
      colors.push_back(Color(1,.5,0));
      colors.push_back(Color(.5,1,0));
      colors.push_back(Color(1,0,.5));
      colors.push_back(Color(0,1,.5));
      colors.push_back(Color(0,.5,1));
      colors.push_back(Color(.5,0,1));
    } while(int(colors.size())<num);
    //    colors.push_back(Color(1,1,1));
    if(num>0) colors.resize(num);
  }
  ///\e
  Color &operator[](int i)
  {
    return colors[i%colors.size()];
  }
  ///\e
  const Color &operator[](int i) const
  {
    return colors[i%colors.size()];
  }
  ///\e
  void set(int i,const Color &c)
  {
    colors[i%colors.size()]=c;
  }
  ///Sets the number of the exiting colors.
  void resize(int s) { colors.resize(s);}
  ///Returns the number of the existing colors.
  std::size_t size() const { return colors.size();}
};

///Returns a visible distinct \ref Color

///Returns a \ref Color which is as different from the given parameter
///as it is possible.
inline Color distantColor(const Color &c) 
{
  return Color(c.red()<.5?1:0,c.green()<.5?1:0,c.blue()<.5?1:0);
}
///Returns black for light colors and white for the dark ones.

///Returns black for light colors and white for the dark ones.
inline Color distantBW(const Color &c){
  return (.2125*c.red()+.7154*c.green()+.0721*c.blue())<.5 ? WHITE : BLACK;
}

/// @}

} //END OF NAMESPACE LEMON

#endif // LEMON_COLOR_H