Editing WoW:USERAPI ColorGradient

{{userfunc}}
__NOTOC__

Converts a percent value into a gradient from 2 or more RGB percent values (0.0-1.0).  If more than 2 colors are passed, the gradient will be between the two colors which perc lies in an evenly divided range.

(Note that if you will always be generating a gradient between the same number of colors, you will see *significantly* greater performance if you customize this function to take a fixed number of arguments.)

 local function ColorGradient(perc, ...)
 	if perc >= 1 then
 		local r, g, b = select(select('#', ...) - 2, ...)
 		return r, g, b
 	elseif perc <= 0 then
 		local r, g, b = ...
 		return r, g, b
 	end
 	
 	local num = select('#', ...) / 3
 
 	local segment, relperc = math.modf(perc*(num-1))
 	local r1, g1, b1, r2, g2, b2 = select((segment*3)+1, ...)
 
 	return r1 + (r2-r1)*relperc, g1 + (g2-g1)*relperc, b1 + (b2-b1)*relperc
 end

== Example ==
For this example we'll use 3 colors: red, yellow and green.  For a percent value of 0.75 we'd expect to get back a color that's halfway between yellow and green.  0.5 would yield pure yellow, 0.25 would yield an orange.

 local r,g,b = ColorGradient(0.75, 1,0,0, 1,1,0, 0,1,0)
 -- r = 0.5, g = 1.0, b = 0.0