Rgb2hsv in Coffeescript

Rgb2hsv in Coffeescript

rgb2hsv (r,g,b) -> 
	r=r/255
	g=g/255
	b=b/255

	max = Math.max(r,g,b)
	min = Math.min(r,g,b)

	v = max
	d = max - min
	s = if max == 0 then 0 else d/max

	h = if max == min then 0 
	else
		switch max
			when r then h = (g-b) / (d + ( if g < b then 6 else 0))
			when g then h = (b-r) / d + 2 
			when b then h = (r-g) / d + 4 
		h / 6

	[h,s,v]