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

   void hsvT0rgb (hlsSpace& hls, rgbSpace& rgb) 
   {
      /*  HLS and RGB values are in the range from 0 to 1.0  */
      int k
      float aa, bb, cc, f;

      if ( s <= 0.0)
         r = g = b = v;       //  Have gray scale if s = 0.
      else {
         if (h == 1.0)
            h = 0.0;
         h *= 6.0;
         k = floor (h);
         f = h - k;
         aa = v * (1.0 - s);

         bb = v * (1.0 - (s * f));
         cc = v * (1.0 - (s * (1.0 - f)));
         switch (k)
         {
            case 0:  r = v;   g = cc;  b = aa; break;
            case 1:  r = bb;  g = v;   b = aa; break;
            case 2:  r = aa;  g = v;   b = cc; break;
            case 3:  r = aa;  g = bb;  b = v; break;
            case 4:  r = cc;  g = aa;  b = v; break;
            case 5:  r = v;   g = aa;  b = bb; break;
         }
      }
   }