// FILE: color.cpp
// written for the course 2172, 1999
//
#include "color.h"

// constant colors

// transperent, clear or eraser
const color clear(-1,-1,-1);


const color white(255,255,255);
const color black(0,0,0);

// rainbow
const color red(255,0,0);
const color green(0,255,0);
const color blue(0,0,255);

// inverses
const color cyan(0,255,255);
const color yellow(255,255,0);
const color magenta(255,0,255);

// constructor
color::color(short r,short g,short b):
      _red((short)(r<0 || g<0 || b<0 ?-1:r%256)),
      _green((short)(r<0 || g<0 || b<0 ?-1:g%256)),
      _blue((short)(r<0 || g<0 || b<0 ?-1:b%256)) {
}



// properties
short color::red() const { return _red; }
short color::blue() const { return _blue; }
short color::green() const { return _green; }


bool operator==(const color& c1,const color& c2) {
   return ( c1.red()   == c2.red() &&
            c1.green() == c2.green() &&
            c1.blue()  == c2.blue());
}

bool operator!=(const color& c1,const color& c2) {
   return ( c1.red()   != c2.red() ||
            c1.green() != c2.green() ||
            c1.blue()  != c2.blue());
}

ostream& operator<<(ostream& os, const color& c) {
   return os << '(' << c._red << ',' << c._green << ',' 
             << c._blue << ')';
}