lemon/color.h
author Alpar Juttner <alpar@cs.elte.hu>
Thu, 04 Aug 2011 22:00:57 +0200
changeset 924 3dcb45a871c3
parent 209 765619b7cbb2
child 440 88ed40ad0d4f
permissions -rw-r--r--
Update the AUTHORS file
     1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library.
     4  *
     5  * Copyright (C) 2003-2008
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
     8  *
     9  * Permission to use, modify and distribute this software is granted
    10  * provided that this copyright notice appears in all copies. For
    11  * precise terms see the accompanying LICENSE file.
    12  *
    13  * This software is provided "AS IS" with no warranty of any kind,
    14  * express or implied, and with no claim as to its suitability for any
    15  * purpose.
    16  *
    17  */
    18 
    19 #ifndef LEMON_COLOR_H
    20 #define LEMON_COLOR_H
    21 
    22 #include<vector>
    23 #include<lemon/math.h>
    24 #include<lemon/maps.h>
    25 
    26 
    27 ///\ingroup misc
    28 ///\file
    29 ///\brief Tools to manage RGB colors.
    30 
    31 namespace lemon {
    32 
    33 
    34   /// \addtogroup misc
    35   /// @{
    36 
    37   ///Data structure representing RGB colors.
    38 
    39   ///Data structure representing RGB colors.
    40   class Color
    41   {
    42     double _r,_g,_b;
    43   public:
    44     ///Default constructor
    45     Color() {}
    46     ///Constructor
    47     Color(double r,double g,double b) :_r(r),_g(g),_b(b) {};
    48     ///Set the red component
    49     double & red() {return _r;}
    50     ///Return the red component
    51     const double & red() const {return _r;}
    52     ///Set the green component
    53     double & green() {return _g;}
    54     ///Return the green component
    55     const double & green() const {return _g;}
    56     ///Set the blue component
    57     double & blue() {return _b;}
    58     ///Return the blue component
    59     const double & blue() const {return _b;}
    60     ///Set the color components
    61     void set(double r,double g,double b) { _r=r;_g=g;_b=b; };
    62   };
    63 
    64   /// White color constant
    65   extern const Color WHITE;
    66   /// Black color constant
    67   extern const Color BLACK;
    68   /// Red color constant
    69   extern const Color RED;
    70   /// Green color constant
    71   extern const Color GREEN;
    72   /// Blue color constant
    73   extern const Color BLUE;
    74   /// Yellow color constant
    75   extern const Color YELLOW;
    76   /// Magenta color constant
    77   extern const Color MAGENTA;
    78   /// Cyan color constant
    79   extern const Color CYAN;
    80   /// Grey color constant
    81   extern const Color GREY;
    82   /// Dark red color constant
    83   extern const Color DARK_RED;
    84   /// Dark green color constant
    85   extern const Color DARK_GREEN;
    86   /// Drak blue color constant
    87   extern const Color DARK_BLUE;
    88   /// Dark yellow color constant
    89   extern const Color DARK_YELLOW;
    90   /// Dark magenta color constant
    91   extern const Color DARK_MAGENTA;
    92   /// Dark cyan color constant
    93   extern const Color DARK_CYAN;
    94 
    95   ///Map <tt>int</tt>s to different <tt>Color</tt>s
    96 
    97   ///This map assigns one of the predefined \ref Color "Color"s to
    98   ///each <tt>int</tt>. It is possible to change the colors as well as
    99   ///their number. The integer range is cyclically mapped to the
   100   ///provided set of colors.
   101   ///
   102   ///This is a true \ref concepts::ReferenceMap "reference map", so
   103   ///you can also change the actual colors.
   104 
   105   class Palette : public MapBase<int,Color>
   106   {
   107     std::vector<Color> colors;
   108   public:
   109     ///Constructor
   110 
   111     ///Constructor.
   112     ///\param have_white Indicates whether white is among the
   113     ///provided initial colors (\c true) or not (\c false). If it is true,
   114     ///white will be assigned to \c 0.
   115     ///\param num The number of the allocated colors. If it is \c -1,
   116     ///the default color configuration is set up (26 color plus optionaly the
   117     ///white).  If \c num is less then 26/27 then the default color
   118     ///list is cut. Otherwise the color list is filled repeatedly with
   119     ///the default color list.  (The colors can be changed later on.)
   120     Palette(bool have_white=false,int num=-1)
   121     {
   122       if (num==0) return;
   123       do {
   124         if(have_white) colors.push_back(Color(1,1,1));
   125 
   126         colors.push_back(Color(0,0,0));
   127         colors.push_back(Color(1,0,0));
   128         colors.push_back(Color(0,1,0));
   129         colors.push_back(Color(0,0,1));
   130         colors.push_back(Color(1,1,0));
   131         colors.push_back(Color(1,0,1));
   132         colors.push_back(Color(0,1,1));
   133 
   134         colors.push_back(Color(.5,0,0));
   135         colors.push_back(Color(0,.5,0));
   136         colors.push_back(Color(0,0,.5));
   137         colors.push_back(Color(.5,.5,0));
   138         colors.push_back(Color(.5,0,.5));
   139         colors.push_back(Color(0,.5,.5));
   140 
   141         colors.push_back(Color(.5,.5,.5));
   142         colors.push_back(Color(1,.5,.5));
   143         colors.push_back(Color(.5,1,.5));
   144         colors.push_back(Color(.5,.5,1));
   145         colors.push_back(Color(1,1,.5));
   146         colors.push_back(Color(1,.5,1));
   147         colors.push_back(Color(.5,1,1));
   148 
   149         colors.push_back(Color(1,.5,0));
   150         colors.push_back(Color(.5,1,0));
   151         colors.push_back(Color(1,0,.5));
   152         colors.push_back(Color(0,1,.5));
   153         colors.push_back(Color(0,.5,1));
   154         colors.push_back(Color(.5,0,1));
   155       } while(int(colors.size())<num);
   156       if(num>=0) colors.resize(num);
   157     }
   158     ///\e
   159     Color &operator[](int i)
   160     {
   161       return colors[i%colors.size()];
   162     }
   163     ///\e
   164     const Color &operator[](int i) const
   165     {
   166       return colors[i%colors.size()];
   167     }
   168     ///\e
   169     void set(int i,const Color &c)
   170     {
   171       colors[i%colors.size()]=c;
   172     }
   173     ///Adds a new color to the end of the color list.
   174     void add(const Color &c)
   175     {
   176       colors.push_back(c);
   177     }
   178 
   179     ///Sets the number of the existing colors.
   180     void resize(int s) { colors.resize(s);}
   181     ///Returns the number of the existing colors.
   182     int size() const { return int(colors.size());}
   183   };
   184 
   185   ///Returns a visibly distinct \ref Color
   186 
   187   ///Returns a \ref Color which is as different from the given parameter
   188   ///as it is possible.
   189   inline Color distantColor(const Color &c)
   190   {
   191     return Color(c.red()<.5?1:0,c.green()<.5?1:0,c.blue()<.5?1:0);
   192   }
   193   ///Returns black for light colors and white for the dark ones.
   194 
   195   ///Returns black for light colors and white for the dark ones.
   196   inline Color distantBW(const Color &c){
   197     return (.2125*c.red()+.7154*c.green()+.0721*c.blue())<.5 ? WHITE : BLACK;
   198   }
   199 
   200   /// @}
   201 
   202 } //END OF NAMESPACE LEMON
   203 
   204 #endif // LEMON_COLOR_H