If you want to have it much faster, use transparent PNG image for saturation-value rectangle instead of drawing everything in canvas and then just color its bac

If you want to have it much faster, use transparent PNG image for saturation-value rectangle instead of drawing everything in canvas and then just color its background property according to hue. Long ago I needed color picker, so I did research many options. This was the most efficient implementation I found (the trick I described above comes from here): http://ecritters.biz/colorselector/ http://ecritters.biz/colorselector/