include/Geant4/G4Colour.hh

0001 //
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0025 //
0026 //
0027 //
0028 //
0029 // John Allison 20th October 1996
0030
0031 // Class Description:
0032 // Class G4Colour has 4 fields, which represent the RGBA (red, green, blue,
0033 // and alpha) components of colour. Each component takes a value between
0034 // 0 and 1. If an irrelevant value, i.e., a value less than 0 or greater
0035 // than 1, is given as an argument of the constructor, such a value is
0036 // automatically clipped to 0 or 1. Alpha is opacity (1 = opaque).
0037 //
0038 // A G4Colour object is instantiated by giving red, green, and blue
0039 // components to its constructor, i.e.,
0040 //
0041 //      G4Colour::G4Colour ( G4double r = 1.0,
0042 //                           G4double g = 1.0,
0043 //                           G4double b = 1.0,
0044 //                           G4double a = 1.0);
0045 //                                   // 0<=red, green, blue <= 1.0
0046 //
0047 // The default value of each component is 1.0. That is to say, the default
0048 // colour is "white".  For example, colours which are often used can be
0049 // instantiated as follows:
0050 //
0051 //      G4Colour  white   ()              ;  // white
0052 //      G4Colour  white   (1.0, 1.0, 1.0) ;  // white
0053 //      G4Colour  gray    (0.5, 0.5, 0.5) ;  // gray
0054 //      G4Colour  black   (0.0, 0.0, 0.0) ;  // black
0055 //      G4Colour  brown   (0.45,0.25,0.0) ;  // G4 logo brown
0056 //      G4Colour  red     (1.0, 0.0, 0.0) ;  // red
0057 //      G4Colour  green   (0.0, 1.0, 0.0) ;  // green
0058 //      G4Colour  blue    (0.0, 0.0, 1.0) ;  // blue
0059 //      G4Colour  cyan    (0.0, 1.0, 1.0) ;  // cyan
0060 //      G4Colour  magenta (1.0, 0.0, 1.0) ;  // magenta
0061 //      G4Colour  yellow  (1.0, 1.0, 0.0) ;  // yellow
0062 //
0063 // For convenience, static member functions are also defined for the above colours.
0064 //
0065 // After instantiation of a G4Colour object, you can access to its components
0066 // with the following access functions:
0067 //
0068 //      G4double G4Colour::GetRed   () const ; // Get the red   component.
0069 //      G4double G4Colour::GetGreen () const ; // Get the green component.
0070 //      G4double G4Colour::GetBlue  () const ; // Get the blue  component.
0071 //
0072 // Class Description - End:
0073
0074 #ifndef G4COLOUR_HH
0075 #define G4COLOUR_HH
0076
0077 #include "globals.hh"
0078 #include "G4ThreeVector.hh"
0079 #include <iostream>
0080 #include <map>
0081
0082 class G4Colour {
0083
0084   friend std::ostream& operator << (std::ostream&, const G4Colour&);
0085
0086 public: // With description
0087
0088   G4Colour (G4double r_ = 1., G4double g_ = 1., G4double b_ = 1.,
0089             G4double a_ = 1.);
0090
0091   G4Colour (G4ThreeVector);
0092   // Converts the components of the 3-vector into red, green, blue.
0093   // The opacity, alpha = 1.
0094
0095   operator G4ThreeVector();
0096   // Converts red, green, blue into the components of a 3-vector.
0097
0098   G4bool operator != (const G4Colour& c) const;
0099   G4bool operator == (const G4Colour& c) const {return !(operator != (c));}
0100
0101   G4Colour& operator += (const G4Colour& rhs) {*this = rhs; return *this;}
0102   // Note: This is required by RayTracer in its use of G4THitsMap.
0103   // Adding colours, without also taking brightness into account, does not make
0104   // sense, so let us make it synonymous with operator=, which is, I guess,
0105   // equivalent to covering the old colour with the new, like a coat of paint.
0106
0107   G4double GetRed   () const;
0108   G4double GetGreen () const;
0109   G4double GetBlue  () const;
0110   G4double GetAlpha () const;  // alpha = opacity = 1. - transparency.
0111
0112   void SetRed   (G4double);
0113   void SetGreen (G4double);
0114   void SetBlue  (G4double);
0115   void SetAlpha (G4double);  // alpha = opacity = 1. - transparency.
0116
0117   static G4Colour White();
0118   static G4Colour Gray();
0119   static G4Colour Grey();
0120   static G4Colour Black();
0121   static G4Colour Brown();  // G4 logo brown
0122   static G4Colour Red();
0123   static G4Colour Green();
0124   static G4Colour Blue();
0125   static G4Colour Cyan();
0126   static G4Colour Magenta();
0127   static G4Colour Yellow();
0128
0129   static G4bool GetColour(const G4String& key, G4Colour& result);
0130   // Get colour for given key, placing it in result.
0131   // The key is usually the name of the colour.
0132   // The key is not case sensitive.
0133   // Returns false if key doesn't exist, leaving result unchanged.
0134
0135   static void AddToMap(const G4String& key, const G4Colour& colour);
0136   // Add user defined colour to colour map with given key. Standard
0137   // colours are added to map by default.
0138
0139   static void InitialiseColourMap();
0140   static const std::map<G4String, G4Colour>& GetMap();
0141
0142   G4bool operator< (const G4Colour& rhs) const;
0143
0144 private:
0145   G4double red, green, blue, alpha;
0146
0147   static std::map<G4String, G4Colour> fColourMap;
0148   static G4bool fInitColourMap;
0149
0150 };
0151
0152 inline G4double G4Colour::GetRed   () const {return red;}
0153 inline G4double G4Colour::GetGreen () const {return green;}
0154 inline G4double G4Colour::GetBlue  () const {return blue;}
0155 inline G4double G4Colour::GetAlpha () const {return alpha;}
0156 inline G4Colour G4Colour::White()   {return G4Colour(1.0, 1.0, 1.0);}
0157 inline G4Colour G4Colour::Gray()    {return G4Colour(0.5, 0.5, 0.5);}
0158 inline G4Colour G4Colour::Grey()    {return G4Colour(0.5, 0.5, 0.5);}
0159 inline G4Colour G4Colour::Black()   {return G4Colour(0.0, 0.0, 0.0);}
0160 inline G4Colour G4Colour::Brown()   {return G4Colour(0.45,0.25,0.0);}
0161 inline G4Colour G4Colour::Red()     {return G4Colour(1.0, 0.0, 0.0);}
0162 inline G4Colour G4Colour::Green()   {return G4Colour(0.0, 1.0, 0.0);}
0163 inline G4Colour G4Colour::Blue()    {return G4Colour(0.0, 0.0, 1.0);}
0164 inline G4Colour G4Colour::Cyan()    {return G4Colour(0.0, 1.0, 1.0);}
0165 inline G4Colour G4Colour::Magenta() {return G4Colour(1.0, 0.0, 1.0);}
0166 inline G4Colour G4Colour::Yellow()  {return G4Colour(1.0, 1.0, 0.0);}
0167
0168 #endif