WoW:USERAPI ColorGradient - Revision history

Bear at 21:13, 2 August 2025

2025-08-02T21:13:43Z

← Older revision		Revision as of 21:13, 2 August 2025
Line 5:		Line 5:

	(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.)		(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.)
			<pre>
	local function ColorGradient(perc, ...)		local function ColorGradient(perc, ...)
	if perc >= 1 then		if perc >= 1 then
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	return r1 + (r2-r1)relperc, g1 + (g2-g1)relperc, b1 + (b2-b1)*relperc		return r1 + (r2-r1)relperc, g1 + (g2-g1)relperc, b1 + (b2-b1)*relperc
	end		end
			</pre>

	== Example ==		== 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.		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.
			<pre>
	local r,g,b = ColorGradient(0.75, 1,0,0, 1,1,0, 0,1,0)		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		-- r = 0.5, g = 1.0, b = 0.0
			</pre>

Move page script: Move page script moved page USERAPI ColorGradient to WoW:USERAPI ColorGradient without leaving a redirect

2023-08-15T04:49:10Z

Move page script moved page USERAPI ColorGradient to USERAPI ColorGradient without leaving a redirect

← Older revision	Revision as of 04:49, 15 August 2023
(No difference)

WoWWiki>Kemayo: Add performance note for the common case.

2007-04-16T22:56:52Z

Add performance note for the common case.

← Older revision		Revision as of 22:56, 16 April 2007
Line 3:		Line 3:

	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.		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, ...)		local function ColorGradient(perc, ...)

WoWWiki>Ckknight at 00:19, 15 April 2007

2007-04-15T00:19:21Z

← Older revision		Revision as of 00:19, 15 April 2007
Line 5:		Line 5:

	local function ColorGradient(perc, ...)		local function ColorGradient(perc, ...)
	~~local num = select("#", ...) / 3~~

	if perc >= 1 then		if perc >= 1 then
	local r, g, b = select(~~num*3~~-2, ...)		local r, g, b = select(select('#', ...) - 2, ...)
	return r, g, b		return r, g, b
	elseif perc <= 0 then		elseif perc <= 0 then
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	return r, g, b		return r, g, b
	end		end

			local num = select('#', ...) / 3

	local segment, relperc = math.modf(perc*(num-1))		local segment, relperc = math.modf(perc*(num-1))

WoWWiki>Tardmrr: Correcting a small bug with the perc >= 1 case

2007-04-15T00:17:18Z

Correcting a small bug with the perc >= 1 case

← Older revision		Revision as of 00:17, 15 April 2007
Line 8:		Line 8:

	if perc >= 1 then		if perc >= 1 then
	local r, g, b = select(num-2, ...)		local r, g, b = select(num*3-2, ...)
	return r, g, b		return r, g, b
	elseif perc <= 0 then		elseif perc <= 0 then

WoWWiki>Ckknight: Optimized function

2007-04-15T00:11:46Z

Optimized function

← Older revision		Revision as of 00:11, 15 April 2007
Line 7:		Line 7:
	local num = select("#", ...) / 3		local num = select("#", ...) / 3

	if perc == 1 then ~~return~~ select(num-2, ...), ~~select(num-1~~, ...), ~~select(num~~, ~~...)~~ end		if perc >= 1 then
			local r, g, b = select(num-2, ...)
			return r, g, b
			elseif perc <= 0 then
			local r, g, b = ...
			return r, g, b
			end

	local segment, relperc = math.modf(perc*(num-1))		local segment, relperc = math.modf(perc*(num-1))
	local r1, g1, b1 ~~= select((segment3)+1, ...)~~, ~~select((segment3)+2, ...), select((segment*3)+3, ...)~~		local r1, g1, b1, r2, g2, b2 = select((segment*3)+1, ...)
	~~local~~ r2, g2, b2 = select((segment3)+~~4, ...), select((segment3)+5, ...), select((segment*3)+6~~, ...)

	return r1 + (r2-r1)relperc, g1 + (g2-g1)relperc, b1 + (b2-b1)*relperc		return r1 + (r2-r1)relperc, g1 + (g2-g1)relperc, b1 + (b2-b1)*relperc

WoWWiki>Tekkub at 00:12, 12 February 2007

2007-02-12T00:12:37Z

New page

{{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.

local function ColorGradient(perc, ...)
local num = select("#", ...) / 3

if perc == 1 then return select(num-2, ...), select(num-1, ...), select(num, ...) end

local segment, relperc = math.modf(perc*(num-1))
local r1, g1, b1 = select((segment*3)+1, ...), select((segment*3)+2, ...), select((segment*3)+3, ...)
local r2, g2, b2 = select((segment*3)+4, ...), select((segment*3)+5, ...), select((segment*3)+6, ...)

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