cardcolor.cpp

ColorDarker ColorLighter ColorScaleHSL ColorScaleRGB fMax fMin HLStoRGB HueToRGB MakeRGB MAX3 MIN3 RGBtoHLS

void RGBtoHLS ( const COLORREF  rgb, double *  H, double *  L, double *  S   ) Definition at line 28 of file cardcolor.cpp. Referenced by ColorScaleHSL(). { double delta; double r = (double)((rgb )&0xFF)/255; double g = (double)((rgb>> 8)&0xFF)/255; double b = (double)((rgb>>16)&0xFF)/255; double cmax = MAX3(r,g,b); double cmin = MIN3(r,g,b); *L=(cmax+cmin)/2.0; if(cmax == cmin) { *S = *H = 0; // it's really undefined } else { if(*L < 0.5) *S = (cmax-cmin)/(cmax+cmin); else *S = (cmax-cmin)/(2.0-cmax-cmin); delta = cmax - cmin; if(r == cmax) { *H = (g - b) / delta; } else { if(g == cmax) *H = 2.0 + (b-r) / delta; else *H = 4.0 + (r-g) / delta; } *H /= 6.0; if (*H < 0.0) *H += 1; } }