-struct RGBColor;
-/// returns a string of form #rrggbb, given an RGBColor struct
-std::string const X11hexname(RGBColor const & col);
-
-struct HSVColor {
- double h;
- double s;
- double v;
- HSVColor() : h(0.0), s(0.0), v(0.0) {}
- HSVColor(double hue, double sat, double val)
- : h(hue), s(sat), v(val) {}
- HSVColor(RGBColor const &);
-};
-