+
+RGBColor::RGBColor(string const & x11hexname)
+ : r(0), g(0), b(0)
+{
+ BOOST_ASSERT(x11hexname.size() == 7 && x11hexname[0] == '#');
+ r = hexstrToInt(x11hexname.substr(1,2));
+ g = hexstrToInt(x11hexname.substr(3,2));
+ b = hexstrToInt(x11hexname.substr(5,2));
+}
+
+
+RGBColor::RGBColor(HSVColor const & hsv)
+{
+ double h = hsv.h;
+ double const s = hsv.s;
+ double const v = hsv.v;
+
+ double rd, gd, bd;
+
+ if (h == nohue || s == 0.0) {
+ rd = gd = bd = v;
+ } else {
+ if (h == 360.0) h = 0.0;
+ h /= 60.0;
+
+ int const j = max(0, static_cast<int>(::floor(h)));
+ //if (j < 0) j = 0;
+
+ double const f = h - j;
+ double const p = v * (1.0 - s);
+ double const q = v * (1.0 - (s * f));
+ double const t = v * (1.0 - (s * (1.0 - f)));
+
+ switch (j) {
+ case 0:
+ rd = v;
+ gd = t;
+ bd = p;
+ break;
+ case 1:
+ rd = q;
+ gd = v;
+ bd = p;
+ break;
+ case 2:
+ rd = p;
+ gd = v;
+ bd = t;
+ break;
+ case 3:
+ rd = p;
+ gd = q;
+ bd = v;
+ break;
+ case 4:
+ rd = t;
+ gd = p;
+ bd = v;
+ break;
+ case 5:
+ rd = v;
+ gd = p;
+ bd = q;
+ break;
+ default:
+ rd = v;
+ gd = t;
+ bd = p;
+ break; // should never happen.
+ }
+ }
+
+ r = static_cast<int>(::floor((rd * 255.0) + 0.5));
+ g = static_cast<int>(::floor((gd * 255.0) + 0.5));
+ b = static_cast<int>(::floor((bd * 255.0) + 0.5));
+}
+
+
+/////////////////////////////////////////////////////////////////////
+//
+// HSVColor
+//
+/////////////////////////////////////////////////////////////////////
+
+HSVColor::HSVColor(RGBColor const & rgb)
+{
+ double const r = rgb.r / 255.0;
+ double const g = rgb.g / 255.0;
+ double const b = rgb.b / 255.0;
+
+ double const maxval = max(max(r, g), b);
+ double const minval = min(min(r, g), b);
+
+ v = maxval;
+
+ double const diff = maxval - minval;
+ if (maxval != 0.0)
+ s = diff / maxval;
+ else
+ s = 0.0;
+
+ h = nohue;
+ if (s != 0.0) {
+ double const rc = (maxval - r) / diff;
+ double const gc = (maxval - g) / diff;
+ double const bc = (maxval - b) / diff;
+
+ if (r == maxval)
+ h = bc - gc;
+ else if (g == maxval)
+ h = 2.0 + rc - bc;
+ else if (b == maxval)
+ h = 4.0 + gc - rc;
+
+ h *= 60.0;
+ if (h < 0)
+ h += 360;
+ }
+}
+
+
+
+/////////////////////////////////////////////////////////////////////
+//
+// Color::Pimpl
+//
+/////////////////////////////////////////////////////////////////////
+