}
-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