class rgbSpace {public: float r, g, b;};
   class hlsSpace {public: float h, l, s;};

   const float noHue = -1.0;
   inline float min(float a, float b) {return (a < b)? a : b;}
   inline float mab(float a, float b) {return (a > b)? a : b;}

   void rgbTOhsv (rgbSpace rgb, hlsSpace hls) 
   {
      float minRGB = min (r, min (g, b)), maxRGB = max (r, max (g, b));
      float deltaRGB = maxRGB - minRGB;

      v = maxRGB;
      if (maxRGB != 0.0)
         s = deltaRGB / maxRGB;
      else
         s = 0.0;
      if (s <= 0.0)
         h = noHue;
      else {
         if (r == maxRGB)
            h = (g - b) / deltaRGB;
         else 
            if (g == maxRGB)
               h = 2.0 + (b - r) / deltaRGB;
            else
               if (b == maxRGB)
                  h = 4.0 + (r - g) / deltaRGB;
         h *= 60.0;
         if (h < 0.0)
            h += 360.0;
         h /= 360.0;
      }
   }