Module:Color contrast: Difference between revisions
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m (whitespace fixes) |
(split the color data out to Module:Color contrast/colors and load it with mw.loadData - this way we only create the table once per page rather than every time color2lum is called) |
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-- |
-- |
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local p = {} |
local p = {} |
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local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' ) |
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local function sRGB ( v ) |
local function sRGB ( v ) |
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return '' |
return '' |
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end |
end |
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local HTMLcolor = { |
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white = 1, |
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silver = 0.52711512570581, |
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gray = 0.2158605001139, |
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black = 0, |
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red = 0.2126, |
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maroon = 0.045891942324215, |
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yellow = 0.9278, |
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olive = 0.20027537200568, |
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lime = 0.7152, |
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green = 0.15438342968146, |
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aqua = 0.7874, |
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teal = 0.16996855778968, |
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blue = 0.0722, |
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navy = 0.015585128108224, |
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fuchsia = 0.2848, |
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purple = 0.061477070432439, |
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orange = 0.4817026703631, |
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gold = 0.69860877428159, |
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pink = 0.63271070702466, |
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lightpink = 0.58566152734898, |
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hotpink = 0.34658438169715, |
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deeppink = 0.23866895828276, |
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palevioletred = 0.28754994117889, |
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mediumvioletred = 0.14371899849357, |
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lightsalmon = 0.4780675225206, |
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salmon = 0.36977241527596, |
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darksalmon = 0.40541471563381, |
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lightcoral = 0.35522120733135, |
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indianred = 0.21406134963884, |
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crimson = 0.16042199953026, |
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firebrick = 0.10724525535015, |
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darkred = 0.054889674531132, |
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orangered = 0.25516243753416, |
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tomato = 0.30638612719415, |
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coral = 0.37017930872924, |
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darkorange = 0.40016167026524, |
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lightyellow = 0.98161818392882, |
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lemonchiffon = 0.94038992245622, |
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lightgoldenrodyellow = 0.93348351018297, |
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papayawhip = 0.87797100199835, |
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moccasin = 0.80083000991567, |
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peachpuff = 0.74905589878251, |
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palegoldenrod = 0.78792647887614, |
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khaki = 0.77012343394121, |
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darkkhaki = 0.45747326349994, |
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cornsilk = 0.93562110372965, |
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blanchedalmond = 0.85084439608156, |
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bisque = 0.80732327372979, |
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navajowhite = 0.76519682342785, |
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wheat = 0.74909702820482, |
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burlywood = 0.51559844533893, |
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tan = 0.48237604163921, |
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rosybrown = 0.32319457649407, |
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sandybrown = 0.46628543696283, |
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goldenrod = 0.41919977809569, |
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darkgoldenrod = 0.27264703559993, |
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peru = 0.30113074877936, |
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chocolate = 0.23898526114557, |
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saddlebrown = 0.097922285020521, |
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sienna = 0.13697631337098, |
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brown = 0.098224287876511, |
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} |
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-- whitespace |
-- whitespace |
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c = c:match( '^%s*(.-)%s*$' ) |
c = c:match( '^%s*(.-)%s*$' ) |
Revision as of 13:22, 25 July 2015
Documentation for this module may be created at Module:Color contrast/doc
--
-- This module implements
-- {{Color contrast ratio}}
-- {{Greater color contrast ratio}}
-- {{ColorToLum}}
-- {{RGBColorToLum}}
--
local p = {}
local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' )
local function sRGB ( v )
if (v <= 0.03928) then
v = v / 12.92
else
v = math.pow((v+0.055)/1.055, 2.4)
end
return v
end
local function color2lum( c )
if (c == nil) then
return ''
end
-- whitespace
c = c:match( '^%s*(.-)%s*$' )
-- lowercase
c = c:lower()
-- first try to look it up
local L = HTMLcolor[c]
if (L ~= nil) then
return L
end
-- remove leading # (if there is one) and whitespace
c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')
-- split into rgb
local cs = mw.text.split(c or '', '')
if( #cs == 6 ) then
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2]))/255 )
local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 )
local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 )
L = 0.2126 * R + 0.7152 * G + 0.0722 * B
return L
elseif ( #cs == 3 ) then
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1]))/255 )
local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 )
local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 )
L = 0.2126 * R + 0.7152 * G + 0.0722 * B
return L
end
-- failure, return blank
return ''
end
function p._greatercontrast(args)
local bias = tonumber(args['bias'] or '0') or 0
local v1 = color2lum(args[1] or '')
local c2 = args[2] or '#FFFFFF'
local v2 = color2lum(c2)
local c3 = args[3] or '#000000'
local v3 = color2lum(c3)
local ratio1 = 0;
local ratio2 = 0;
if (type(v1) == 'number' and type(v2) == 'number') then
ratio1 = (v2 + 0.05)/(v1 + 0.05)
ratio1 = (ratio1 < 1) and 1/ratio1 or ratio1
end
if (type(v1) == 'number' and type(v3) == 'number') then
ratio2 = (v3 + 0.05)/(v1 + 0.05)
ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2
end
return (ratio1 + bias > ratio2) and c2 or c3
end
function p._ratio(args)
local v1 = color2lum(args[1])
local v2 = color2lum(args[2])
if (type(v1) == 'number' and type(v2) == 'number') then
-- v1 should be the brighter of the two.
if v2 > v1 then
v1, v2 = v2, v1
end
return (v1 + 0.05)/(v2 + 0.05)
else
return args['error'] or '?'
end
end
function p.lum(frame)
return color2lum(frame.args[1] or frame:getParent().args[1])
end
function p.ratio(frame)
local args = frame.args[1] and frame.args or frame:getParent().args
return p._ratio(args)
end
function p.greatercontrast(frame)
local args = frame.args[1] and frame.args or frame:getParent().args
return p._greatercontrast(args)
end
return p