Diferencia entre revisiones de «Módulo:Color contrast»

De Familia Sanchez Arjona
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m (38 revisiones importadas)
 
(No se muestran 24 ediciones intermedias de 4 usuarios)
Línea 7: Línea 7:
 
--
 
--
 
local p = {}
 
local p = {}
 +
local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' )
  
 
local function sRGB ( v )  
 
local function sRGB ( v )  
Línea 13: Línea 14:
 
else
 
else
 
v = math.pow((v+0.055)/1.055, 2.4)
 
v = math.pow((v+0.055)/1.055, 2.4)
−
    end
+
end
 
return v
 
return v
 +
end
 +
 +
local function rgbdec2lum( R, G, B )
 +
if ( 0 <= R and R < 256 and 0 <= G and G < 256 and 0 <= B and B < 256 ) then
 +
return 0.2126 * sRGB(R/255) + 0.7152 * sRGB(G/255) + 0.0722 * sRGB(B/255)
 +
else
 +
return ''
 +
end
 +
end
 +
 +
local function hsl2lum( h, s, l )
 +
if ( 0 <= h and h < 360 and 0 <= s and s <= 1 and 0 <= l and l <= 1 ) then
 +
local c = (1 - math.abs(2*l - 1))*s
 +
local x = c*(1 - math.abs( math.fmod(h/60, 2) - 1) )
 +
local m = l - c/2
 +
 +
local r, g, b = m, m, m
 +
if( 0 <= h and h < 60 ) then
 +
r = r + c
 +
g = g + x
 +
elseif( 60 <= h and h < 120 ) then
 +
r = r + x
 +
g = g + c
 +
elseif( 120 <= h and h < 180 ) then
 +
g = g + c
 +
b = b + x
 +
elseif( 180 <= h and h < 240 ) then
 +
g = g + x
 +
b = b + c
 +
elseif( 240 <= h and h < 300 ) then
 +
r = r + x
 +
b = b + c
 +
elseif( 300 <= h and h < 360 ) then
 +
r = r + c
 +
b = b + x
 +
end
 +
return rgbdec2lum(255*r, 255*g, 255*b)
 +
else
 +
return ''
 +
end
 
end
 
end
  
 
local function color2lum( c )
 
local function color2lum( c )
−
+
 
 
if (c == nil) then
 
if (c == nil) then
 
return ''
 
return ''
 
end
 
end
 +
-- whitespace
 +
c = c:match( '^%s*(.-)[%s;]*$' )
  
−
local HTMLcolor = {
 
−
white = 1,
 
−
silver = 0.52711512570581,
 
−
gray = 0.2158605001139,
 
−
black = 0,
 
−
red = 0.2126,
 
−
maroon = 0.045891942324215,
 
−
yellow = 0.9278,
 
−
olive = 0.20027537200568,
 
−
lime = 0.7152,
 
−
green = 0.15438342968146,
 
−
aqua = 0.7874,
 
−
teal = 0.16996855778968,
 
−
blue = 0.0722,
 
−
navy = 0.015585128108224,
 
−
fuchsia = 0.2848,
 
−
purple = 0.061477070432439,
 
−
orange = 0.4817026703631,
 
−
 
−
gold = 0.69860877428159,
 
−
pink = 0.63271070702466,
 
−
lightpink = 0.58566152734898,
 
−
hotpink = 0.34658438169715,
 
−
deeppink = 0.23866895828276,
 
−
palevioletred = 0.28754994117889,
 
−
mediumvioletred = 0.14371899849357,
 
−
lightsalmon = 0.4780675225206,
 
−
salmon = 0.36977241527596,
 
−
darksalmon = 0.40541471563381,
 
−
lightcoral = 0.35522120733135,
 
−
indianred = 0.21406134963884,
 
−
crimson = 0.16042199953026,
 
−
firebrick = 0.10724525535015,
 
−
darkred = 0.054889674531132,
 
−
orangered = 0.25516243753416,
 
−
tomato = 0.30638612719415,
 
−
coral = 0.37017930872924,
 
−
darkorange = 0.40016167026524,
 
−
lightyellow = 0.98161818392882,
 
−
lemonchiffon = 0.94038992245622,
 
−
lightgoldenrodyellow = 0.93348351018297,
 
−
papayawhip = 0.87797100199835,
 
−
moccasin = 0.80083000991567,
 
−
peachpuff = 0.74905589878251,
 
−
palegoldenrod = 0.78792647887614,
 
−
khaki = 0.77012343394121,
 
−
darkkhaki = 0.45747326349994,
 
−
cornsilk = 0.93562110372965,
 
−
blanchedalmond = 0.85084439608156,
 
−
bisque = 0.80732327372979,
 
−
navajowhite = 0.76519682342785,
 
−
wheat = 0.74909702820482,
 
−
burlywood = 0.51559844533893,
 
−
tan = 0.48237604163921,
 
−
rosybrown = 0.32319457649407,
 
−
sandybrown = 0.46628543696283,
 
−
goldenrod = 0.41919977809569,
 
−
darkgoldenrod = 0.27264703559993,
 
−
peru = 0.30113074877936,
 
−
chocolate = 0.23898526114557,
 
−
saddlebrown = 0.097922285020521,
 
−
sienna = 0.13697631337098,
 
−
brown = 0.098224287876511,
 
−
}
 
−
    -- whitespace
 
−
    c = c:match( '^%s*(.-)%s*$' )
 
−
   
 
 
-- lowercase
 
-- lowercase
 
c = c:lower()
 
c = c:lower()
−
+
 
 
-- first try to look it up
 
-- first try to look it up
 
local L = HTMLcolor[c]
 
local L = HTMLcolor[c]
Línea 98: Línea 74:
 
return L
 
return L
 
end
 
end
 +
 +
  -- convert from hsl
 +
  if mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9%.]*[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then
 +
local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$')
 +
return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100)
 +
  end
 +
 +
  -- convert from rgb
 +
  if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*%)$') then
 +
local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*%)$')
 +
return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B))
 +
  end
 +
 +
  -- convert from rgb percent
 +
  if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then
 +
local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$')
 +
return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100)
 +
  end
 +
 
-- remove leading # (if there is one) and whitespace
 
-- remove leading # (if there is one) and whitespace
 
c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')
 
c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')
Línea 104: Línea 99:
 
local cs = mw.text.split(c or '', '')
 
local cs = mw.text.split(c or '', '')
 
if( #cs == 6 ) then
 
if( #cs == 6 ) then
−
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2]))/255 )
+
local R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2])
−
local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 )
+
local G = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4])
−
local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 )
+
local B = 16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6])
−
+
 
−
L = 0.2126 * R + 0.7152 * G + 0.0722 * B
+
return rgbdec2lum(R, G, B)
−
return L
 
 
elseif ( #cs == 3 ) then
 
elseif ( #cs == 3 ) then
−
local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1]))/255 )
+
local R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1])
−
local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 )
+
local G = 16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2])
−
local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 )
+
local B = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3])
−
+
 
−
L = 0.2126 * R + 0.7152 * G + 0.0722 * B
+
return rgbdec2lum(R, G, B)
−
return L
 
 
end
 
end
−
+
 
 
-- failure, return blank
 
-- failure, return blank
 
return ''
 
return ''
Línea 147: Línea 140:
 
local v2 = color2lum(args[2])
 
local v2 = color2lum(args[2])
 
if (type(v1) == 'number' and type(v2) == 'number') then
 
if (type(v1) == 'number' and type(v2) == 'number') then
−
return (v2 + 0.05)/(v1 + 0.05)
+
-- 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
 
else
 
return args['error'] or '?'
 
return args['error'] or '?'
 +
end
 +
end
 +
 +
function p._styleratio(args)
 +
local style = (args[1] or ''):lower()
 +
local bg, fg = 'white', 'black'
 +
local lum_bg, lum_fg = 1, 0
 +
 +
if args[2] then
 +
local lum = color2lum(args[2])
 +
if lum ~= '' then bg, lum_bg = args[2], lum end
 +
end
 +
if args[3] then
 +
local lum = color2lum(args[3])
 +
if lum ~= '' then fg, lum_fg = args[3], lum end
 +
end
 +
 +
local slist = mw.text.split(style or '', ';')
 +
for k = 1,#slist do
 +
s = slist[k]
 +
local k,v = s:match( '^[%s]*([^:]-):([^:]-)[%s;]*$' )
 +
k = k or ''
 +
v = v or ''
 +
if (k:match('^[%s]*(background)[%s]*$') or k:match('^[%s]*(background%-color)[%s]*$')) then
 +
local lum = color2lum(v)
 +
if( lum ~= '' ) then bg, lum_bg = v, lum end
 +
elseif (k:match('^[%s]*(color)[%s]*$')) then
 +
local lum = color2lum(v)
 +
if( lum ~= '' ) then bg, lum_fg = v, lum end
 +
end
 +
end
 +
if lum_bg > lum_fg then
 +
return (lum_bg + 0.05)/(lum_fg + 0.05)
 +
else
 +
return (lum_fg + 0.05)/(lum_bg + 0.05)
 
end
 
end
 
end
 
end
Línea 160: Línea 192:
 
local args = frame.args[1] and frame.args or frame:getParent().args
 
local args = frame.args[1] and frame.args or frame:getParent().args
 
return p._ratio(args)
 
return p._ratio(args)
 +
end
 +
 +
function p.styleratio(frame)
 +
local args = frame.args[1] and frame.args or frame:getParent().args
 +
return p._styleratio(args)
 
end
 
end
  

Revisión actual del 13:49 31 may 2016

This module is used primarily by

{{Color contrast ratio}}
{{ColorToLum}} / {{RGBColorToLum}}
{{Color contrast conformance}}
{{Ensure AAA contrast ratio}}
{{Greater color contrast ratio}}

It is also used for tracking within

Module:Navbox
Module:Episode list

and for documentation in

Module:College color

Usage

To use this module, you may use one of the above listed templates or invoke the module directly

To compute relative luminescence

{{ColorToLum|color}} or {{#invoke:Color contrast|lum|color}}

To compute a contrast ratio between two colors

{{Color contrast ratio|color1|color2|error=?}} or {{#invoke:Color contrast|ratio|color1|color2|error=?}}

To determine which of two colors (color2a and color2b) has the greater contrast ratio with a particular color (color1)

{{Greater color contrast ratio|color1|color2a|color2b}} or {{#invoke:Color contrast|greatercontrast|color1|color2a|color2b}}

To compute the contrast ratio between the background and text colors specified in a css style string

{{#invoke:Color contrast|styleratio|css style statement string|default background color|default text color}}


--
-- 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 rgbdec2lum( R, G, B )
	if ( 0 <= R and R < 256 and 0 <= G and G < 256 and 0 <= B and B < 256 ) then
		return 0.2126 * sRGB(R/255) + 0.7152 * sRGB(G/255) + 0.0722 * sRGB(B/255)
	else
		return ''
	end
end

local function hsl2lum( h, s, l )
	if ( 0 <= h and h < 360 and 0 <= s and s <= 1 and 0 <= l and l <= 1 ) then
		local c = (1 - math.abs(2*l - 1))*s
		local x = c*(1 - math.abs( math.fmod(h/60, 2) - 1) )
		local m = l - c/2

		local r, g, b = m, m, m
		if( 0 <= h and h < 60 ) then
			r = r + c
			g = g + x
		elseif( 60 <= h and h < 120 ) then
			r = r + x
			g = g + c
		elseif( 120 <= h and h < 180 ) then
			g = g + c
			b = b + x
		elseif( 180 <= h and h < 240 ) then
			g = g + x
			b = b + c
		elseif( 240 <= h and h < 300 ) then
			r = r + x
			b = b + c
		elseif( 300 <= h and h < 360 ) then
			r = r + c
			b = b + x
		end
		return rgbdec2lum(255*r, 255*g, 255*b)
	else
		return ''
	end
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

   	-- convert from hsl
   	if mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9%.]*[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then
		local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$')
		return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100)
   	end

   	-- convert from rgb
   	if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*%)$') then
		local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*%)$')
		return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B))
   	end

   	-- convert from rgb percent
   	if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then
		local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$')
		return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100)
   	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 = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2])
		local G = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4])
		local B = 16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6])

		return rgbdec2lum(R, G, B)
	elseif ( #cs == 3 ) then
		local R = 16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1])
		local G = 16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2])
		local B = 16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3])

		return rgbdec2lum(R, G, B)
	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._styleratio(args)
	local style = (args[1] or ''):lower()
	local bg, fg = 'white', 'black'
	local lum_bg, lum_fg = 1, 0

	if args[2] then
		local lum = color2lum(args[2])
		if lum ~= '' then bg, lum_bg = args[2], lum end
	end
	if args[3] then
		local lum = color2lum(args[3])
		if lum ~= '' then fg, lum_fg = args[3], lum end
	end

	local slist = mw.text.split(style or '', ';')
	for k = 1,#slist do
		s = slist[k]
		local k,v = s:match( '^[%s]*([^:]-):([^:]-)[%s;]*$' )
		k = k or ''
		v = v or ''
		if (k:match('^[%s]*(background)[%s]*$') or k:match('^[%s]*(background%-color)[%s]*$')) then
			local lum = color2lum(v)
			if( lum ~= '' ) then bg, lum_bg = v, lum end
		elseif (k:match('^[%s]*(color)[%s]*$')) then
			local lum = color2lum(v)
			if( lum ~= '' ) then bg, lum_fg = v, lum end
		end
	end
	if lum_bg > lum_fg then
		return (lum_bg + 0.05)/(lum_fg + 0.05)
	else
		return (lum_fg + 0.05)/(lum_bg + 0.05)
	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.styleratio(frame)
	local args = frame.args[1] and frame.args or frame:getParent().args
	return p._styleratio(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
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