/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library.

  *

  * Copyright (C) 2003-2008

  * 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<vector>

 #include<lemon/math.h>

 #include<lemon/maps.h>

 ///\ingroup misc

 ///\file

 ///\brief Tools to manage RGB colors.

 namespace lemon {

   /// \addtogroup misc

   /// @{

   ///Data structure representing RGB colors.

   ///Data structure representing RGB colors.

   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;

   ///Map <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 concepts::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 among the

     ///provided initial colors (\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 -1,

     ///the default color configuration is set up (26 color plus optionaly 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=-1)

     {

       if (num==0) return;

       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);

       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;

     }

     ///Adds a new color to the end of the color list.

     void add(const Color &c)

     {

       colors.push_back(c);

     }

     ///Sets the number of the existing colors.

     void resize(int s) { colors.resize(s);}

     ///Returns the number of the existing colors.

     int size() const { return int(colors.size());}

   };

   ///Returns a visibly 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