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June 5, 2014 23:10
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A Pen by Captain Anonymous.
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@import "compass/css3"; | |
@function relativeLuminance($color) { | |
@return 0.2126 * red($color)/255.0 + | |
0.7152 * green($color)/255.0 + | |
0.0722 * blue($color)/255.0; | |
} | |
@function contrast($color1,$color2) { | |
$luminance1: relativeLuminance($color1); | |
$luminance2: relativeLuminance($color2); | |
$ratio: ($luminance1 + 0.05)/($luminance2 + 0.05); | |
@if ($ratio < 1) { | |
@return 1/$ratio; | |
} @else { | |
@return $ratio; | |
} | |
} | |
// Add percentage of white to a color | |
@function tint($color, $percent){ | |
@return mix(white, $color, $percent); | |
} | |
// Add percentage of black to a color | |
@function shade($color, $percent){ | |
@return mix(black, $color, $percent); | |
} | |
@function guessGoodColor($color) { | |
$newColor: $color; | |
$oldContrast: 0.0; | |
@if relativeLuminance($color) > 0.5 { | |
@for $i from 0 to 100 { | |
$paletteColor: shade($color, percentage($i/100)); | |
@if (contrast($color, $paletteColor) > 2.0 | |
and contrast($color, $paletteColor) > $oldContrast | |
and contrast($color, $paletteColor) < 5.5) { | |
$newColor: $paletteColor; | |
$oldContrast: contrast($color, $paletteColor); | |
} | |
} | |
} @else { | |
@for $i from 0 to 100 { | |
$paletteColor: tint($color, percentage($i/100)); | |
@if (contrast($color, $paletteColor) > 2.0 | |
and contrast($color, $paletteColor) > $oldContrast | |
and contrast($color, $paletteColor) < 5.5) { | |
$newColor: $paletteColor; | |
$oldContrast: contrast($color, $paletteColor); | |
} | |
} | |
} | |
@return $newColor; | |
} | |
@mixin goodCombi($bgColor){ | |
$text-color: guessGoodColor($bgColor); | |
background-color: $bgColor; | |
color: $text-color; | |
} | |
body { | |
@include goodCombi(red); | |
} |
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