color ColorUtils_mix(const color *c1, const color *c2, double bias)
{
if (bias <= 0.0) return *c1;
if (bias >= 1.0) return *c2;
if (isnan(bias)) return *c1;
{
double r = ColorUtils_mixQreal(FLOAT_COLOR(*c1, red), FLOAT_COLOR(*c2, red), bias);
double g = ColorUtils_mixQreal(FLOAT_COLOR(*c1, green), FLOAT_COLOR(*c2, green), bias);
double b = ColorUtils_mixQreal(FLOAT_COLOR(*c1, blue), FLOAT_COLOR(*c2, blue), bias);
/*double a = ColorUtils_mixQreal(FLOAT_COLOR(*c1, alpha), FLOAT_COLOR(*c2, alpha), bias);*/
return TO_COLOR(r, g, b);
}
}
void fill_gradient_rect(const Rect* r, const Color* c1, const Color* c2, const Point* p1, const Point* p2)
{
Gdiplus::LinearGradientBrush* brush = new Gdiplus::LinearGradientBrush(TO_POINT(p1), TO_POINT(p2), TO_COLOR(c1), TO_COLOR(c2));
graphics->FillRectangle(brush, TO_RECT(r));
delete brush;
}
static color ColorUtils_HCY_toColor(ColorUtils_HCY *hcy)
{
// start with sane component values
double _h = ColorUtils_wrap(hcy->h);
double _c = ColorUtils_normalize(hcy->c);
double _y = ColorUtils_normalize(hcy->y);
// calculate some needed variables
double _hs = _h * 6.0, th, tm;
if (_hs < 1.0) {
th = _hs;
tm = yc[0] + yc[1] * th;
}
else if (_hs < 2.0) {
th = 2.0 - _hs;
tm = yc[1] + yc[0] * th;
}
else if (_hs < 3.0) {
th = _hs - 2.0;
tm = yc[1] + yc[2] * th;
}
else if (_hs < 4.0) {
th = 4.0 - _hs;
tm = yc[2] + yc[1] * th;
}
else if (_hs < 5.0) {
th = _hs - 4.0;
tm = yc[2] + yc[0] * th;
}
else {
th = 6.0 - _hs;
tm = yc[0] + yc[2] * th;
}
// calculate RGB channels in sorted order
double tn, to, tp;
if (tm >= _y) {
tp = _y + _y * _c * (1.0 - tm) / tm;
to = _y + _y * _c * (th - tm) / tm;
tn = _y - (_y * _c);
}
else {
tp = _y + (1.0 - _y) * _c;
to = _y + (1.0 - _y) * _c * (th - tm) / (1.0 - tm);
tn = _y - (1.0 - _y) * _c * tm / (1.0 - tm);
}
// return RGB channels in appropriate order
if (_hs < 1.0)
return TO_COLOR(ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tn));
else if (_hs < 2.0)
return TO_COLOR(ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(tn));
else if (_hs < 3.0)
return TO_COLOR(ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(to));
else if (_hs < 4.0)
return TO_COLOR(ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tp));
else if (_hs < 5.0)
return TO_COLOR(ColorUtils_HCY_igamma(to), ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(tp));
else
return TO_COLOR(ColorUtils_HCY_igamma(tp), ColorUtils_HCY_igamma(tn), ColorUtils_HCY_igamma(to));
}
