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| -- | | -- |
− | -- This module implements | + | -- This module implements |
| -- {{Color contrast ratio}} | | -- {{Color contrast ratio}} |
| -- {{Greater color contrast ratio}} | | -- {{Greater color contrast ratio}} |
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| local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' ) | | local HTMLcolor = mw.loadData( 'Module:Color contrast/colors' ) |
| | | |
− | local function sRGB ( v ) | + | local function sRGB (v) |
− | if (v <= 0.03928) then | + | if (v <= 0.03928) then |
| v = v / 12.92 | | v = v / 12.92 |
| else | | else |
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| end | | end |
| | | |
− | local function rgbdec2lum( R, G, B ) | + | 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 | | 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) | | return 0.2126 * sRGB(R/255) + 0.7152 * sRGB(G/255) + 0.0722 * sRGB(B/255) |
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| end | | end |
| | | |
− | local function hsl2lum( h, s, l ) | + | 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 | | 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 c = (1 - math.abs(2*l - 1))*s |
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| end | | end |
| | | |
− | local function color2lum( c ) | + | local function color2lum(c) |
| | | |
| if (c == nil) then | | if (c == nil) then |
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| end | | end |
| | | |
− | -- 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, 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]*%)$') | | local h, s, l = mw.ustring.match(c,'^hsl%([%s]*([0-9][0-9%.]*)[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$') |
| return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100) | | return hsl2lum(tonumber(h), tonumber(s)/100, tonumber(l)/100) |
− | end
| + | end |
| | | |
− | -- convert from rgb
| + | -- 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]*%)$') then
| + | if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*,[%s]*[0-9][0-9]*[%s]*%)$') 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]*%)$') | | local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*,[%s]*([0-9][0-9]*)[%s]*%)$') |
| return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B)) | | return rgbdec2lum(tonumber(R), tonumber(G), tonumber(B)) |
− | end
| + | end |
| | | |
− | -- convert from rgb percent
| + | -- 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]*%)$') then
| + | if mw.ustring.match(c,'^rgb%([%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*,[%s]*[0-9][0-9%.]*%%[%s]*%)$') 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]*%)$') | | local R, G, B = mw.ustring.match(c,'^rgb%([%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*,[%s]*([0-9][0-9%.]*)%%[%s]*%)$') |
| return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100) | | return rgbdec2lum(255*tonumber(R)/100, 255*tonumber(G)/100, 255*tonumber(B)/100) |
− | end
| + | end |
| | | |
| -- remove leading # (if there is one) and whitespace | | -- remove leading # (if there is one) and whitespace |
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| -- failure, return blank | | -- failure, return blank |
| return '' | | return '' |
| + | end |
| + | |
| + | -- This exports the function for use in other modules. |
| + | -- The colour is passed as a string. |
| + | function p._lum(color) |
| + | return color2lum(color) |
| end | | end |
| | | |
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| ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2 | | ratio2 = (ratio2 < 1) and 1/ratio2 or ratio2 |
| end | | end |
− |
| + | |
| if css then | | if css then |
| local c1 = args[1] or '' | | local c1 = args[1] or '' |
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| return 'background-color:' .. c1 .. '; color:' .. ((ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '') .. ';' | | return 'background-color:' .. c1 .. '; color:' .. ((ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '') .. ';' |
| end | | end |
− |
| + | |
| return (ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '' | | return (ratio1 > 0) and (ratio2 > 0) and ((ratio1 + bias > ratio2) and c2 or c3) or '' |
| end | | end |
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| end | | end |
| | | |
| + | --[[ |
| + | Use {{#invoke:Color contrast|somecolor}} directly or |
| + | {{#invoke:Color contrast}} from a wrapper template. |
| + | |
| + | Parameters: |
| + | -- |1= — required; A color to check. |
| + | --]] |
| function p.lum(frame) | | function p.lum(frame) |
− | return color2lum(frame.args[1] or frame:getParent().args[1]) | + | local color = frame.args[1] or frame:getParent().args[1] |
| + | return p._lum(color) |
| end | | end |
| | | |