color.hpp
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1 
5 /* Copyright (c) 2005-2010 Taneli Kalvas. All rights reserved.
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42 
43 #ifndef COLOR_HPP
44 #define COLOR_HPP 1
45 
46 
47 #include <iostream>
48 #include "error.hpp"
49 
50 
53 class Color {
54 
55  double _comp[4];
57 public:
58 
61  Color() {
62  _comp[0] = 0.0;
63  _comp[1] = 0.0;
64  _comp[2] = 0.0;
65  _comp[3] = 1.0;
66  }
67 
68  Color( double r, double g, double b ) {
69  _comp[0] = r;
70  _comp[1] = g;
71  _comp[2] = b;
72  _comp[3] = 1.0;
73  }
74 
75  Color( double r, double g, double b, double a ) {
76  _comp[0] = r;
77  _comp[1] = g;
78  _comp[2] = b;
79  _comp[3] = a;
80  }
81 
82  const double &operator[]( int i ) const {
83  return( _comp[i] );
84  }
85 
86  double &operator[]( int i ) {
87  return( _comp[i] );
88  }
89 
90  Color operator-( const Color &c ) const {
91  return( Color( _comp[0]-c[0],
92  _comp[1]-c[1],
93  _comp[2]-c[2],
94  _comp[3]-c[3] ) );
95  }
96 
97  Color operator+( const Color &c ) const {
98  return( Color( _comp[0]+c[0],
99  _comp[1]+c[1],
100  _comp[2]+c[2],
101  _comp[3]+c[3] ) );
102  }
103 
104  Color operator*( double x ) const {
105  return( Color( x*_comp[0],
106  x*_comp[1],
107  x*_comp[2],
108  x*_comp[3] ) );
109  }
110 
111  friend Color operator*( double x, const Color &c );
112  friend std::ostream &operator<<( std::ostream &os, const Color &c );
113 };
114 
115 
116 inline Color operator*( double x, const Color &c )
117 {
118  return( Color( x*c[0], x*c[1], x*c[2], x*c[3] ) );
119 }
120 
121 
122 inline std::ostream &operator<<( std::ostream &os, const Color &c )
123 {
124  os << to_string(c[0]) << " "
125  << to_string(c[1]) << " "
126  << to_string(c[2]) << " "
127  << to_string(c[3]);
128  return( os );
129 }
130 
131 
132 #endif
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