Module:Color contrast: Difference between revisions
implement Template:Greater contrast ratio
m>Frietjes (typo) |
m>Frietjes (implement Template:Greater contrast ratio) |
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-- This module implements | -- This module implements | ||
-- {{Color contrast ratio}} | -- {{Color contrast ratio}} | ||
-- {{Greater contrast ratio}} | |||
-- {{ColorToLum}} | -- {{ColorToLum}} | ||
-- {{RGBColorToLum}} | -- {{RGBColorToLum}} | ||
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-- failure, return blank | -- failure, return blank | ||
return '' | 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 | |||
ratio1 = (v3 + 0.05)/(v1 + 0.05) | |||
ratio1 = (ratio1 < 1) and 1/ratio1 or ratio1 | |||
end | |||
return (ratio1 + bias > ratio2) and c2 or c3 | |||
end | end | ||
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return p._ratio(args) | return p._ratio(args) | ||
end | end | ||
function p.greatercontrast(frame) | |||
local args = frame.args[1] and frame.args or frame:getParent().args | |||
return p._greatercontrast(args) | |||
end | |||
return p | return p | ||