Diferencia entre revisiones de «Módulo:Color contrast»

De Familia Sanchez Arjona
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m (38 revisiones importadas)
 
(No se muestran 18 ediciones intermedias de 2 usuarios)
Línea 16: Línea 16:
 
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
 
end
  
 
local function hsl2lum( h, s, l )
 
local function hsl2lum( h, s, l )
−
local lum = ''
 
 
if ( 0 <= h and h < 360 and 0 <= s and s <= 1 and 0 <= l and l <= 1 ) then
 
if ( 0 <= h and h < 360 and 0 <= s and s <= 1 and 0 <= l and l <= 1 ) then
−
local c = (1 - abs(2*l - 1))*s
+
local c = (1 - math.abs(2*l - 1))*s
−
local x = c*(1 - abs( mod(h/60, 2) - 1) )
+
local x = c*(1 - math.abs( math.fmod(h/60, 2) - 1) )
 
local m = l - c/2
 
local m = l - c/2
  
−
local R, G, B = m, m, m
+
local r, g, b = m, m, m
 
if( 0 <= h and h < 60 ) then
 
if( 0 <= h and h < 60 ) then
−
R = R + c
+
r = r + c
−
G = G + x
+
g = g + x
 
elseif( 60 <= h and h < 120 ) then
 
elseif( 60 <= h and h < 120 ) then
−
R = R + x
+
r = r + x
−
G = G + c
+
g = g + c
 
elseif( 120 <= h and h < 180 ) then
 
elseif( 120 <= h and h < 180 ) then
−
G = R + c
+
g = g + c
−
B = G + x
+
b = b + x
 
elseif( 180 <= h and h < 240 ) then
 
elseif( 180 <= h and h < 240 ) then
−
G = R + x
+
g = g + x
−
B = G + c
+
b = b + c
 
elseif( 240 <= h and h < 300 ) then
 
elseif( 240 <= h and h < 300 ) then
−
R = R + x
+
r = r + x
−
B = G + c
+
b = b + c
 
elseif( 300 <= h and h < 360 ) then
 
elseif( 300 <= h and h < 360 ) then
−
R = R + c
+
r = r + c
−
B = G + x
+
b = b + x
 
end
 
end
−
lum = 0.2126 * sRGB(R) + 0.7152 * sRGB(G) + 0.0722 * sRGB(B)
+
return rgbdec2lum(255*r, 255*g, 255*b)
 +
else
 +
return ''
 
end
 
end
−
return lum
 
 
end
 
end
  
Línea 66: Línea 74:
 
return L
 
return L
 
end
 
end
−
-- remove leading # (if there is one) and whitespace
 
−
c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')
 
  
 
   -- convert from hsl
 
   -- 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]*%)$') then
+
   if mw.ustring.match(c,'^hsl%([%s]*[0-9][0-9%.]*[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') then
−
local h = mw.ustring.match(c,'^hsl%[%s]*([0-9][0-9]*)[%s]*,[%s]*[0-9][0-9]*%%[%s]*,[%s]*[0-9][0-9]*%%[%s]*%$')
+
local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$')
−
local s = mw.ustring.match(c,'^hsl%[%s]*[0-9][0-9]*[%s]*,[%s]*([0-9][0-9]*)%%[%s]*,[%s]*[0-9][0-9]*%%[%s]*%$')
+
return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100)
−
local l = mw.ustring.match(c,'^hsl%[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*%%[%s]*,[%s]*([0-9][0-9]*)%%[%s]*%$')
+
  end
−
return hsl2rgb(tonumber(h), tonumber(s)/100, tonumber(l)/100)
+
 
 +
  -- 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
 
   end
 +
 +
-- remove leading # (if there is one) and whitespace
 +
c = mw.ustring.match(c, '^[%s#]*([a-f0-9]*)[%s]*$')
  
 
-- split into rgb
 
-- split into rgb
 
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
  
Línea 130: Línea 147:
 
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 140: 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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