Created
July 29, 2015 06:42
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$vr-font-size: 15px !global; | |
$vr-line-height: 1.5 !global; | |
$vr-cap-height: 0.6 !global; | |
$vr-line-scale: 2 !global; | |
$vr-grid-unit: $vr-line-height * $vr-font-size / $vr-line-scale !global; // (px) | |
@function em($px: 0, $font-size: $vr-font-size) { | |
@return $px / $font-size + em; | |
} | |
@function rem($px: 0) { | |
@return $px / $vr-font-size + rem; | |
} | |
@function grid-units($q: 1) { | |
@return rem($q * $vr-grid-unit); | |
} | |
@mixin set-vr-font-size($font-size: $vr-font-size, $line-height: $vr-line-height) { | |
font-size: $font-size; | |
line-height: $line-height + rem; | |
} | |
// Display the grid as a background image | |
@mixin show-baseline($color: rgb(54, 126, 237)) { | |
background-image: linear-gradient( | |
to bottom, | |
$color 0%, | |
transparent 5% | |
); | |
background-size: 100% rem($vr-grid-unit); | |
background-position: left top; | |
} | |
// based on a gist by Razvan Onofrei: https://gist.github.com/razwan/10662500 | |
// See https://medium.com/@razvanonofrei/aligning-type-to-baseline-the-right-way-using-sass-e258fce47a9b | |
// see also https://gist.github.com/jeromev/11301969 | |
@mixin align-to-baseline($font-size: $vr-font-size, $offset-top: 0, $offset-bottom: 0, $method: 'direction-margins', $scale: $vr-line-scale) { | |
// integer number of base units that can fit the given font-size | |
$lines: ceil($font-size / $vr-grid-unit); | |
// calculate the new line-height | |
$line-height: $vr-grid-unit * $lines; // (px) | |
$line-height-ratio: $line-height / $vr-font-size; | |
// print the results | |
font-size: rem($font-size); | |
line-height: rem($line-height); | |
$baseline-distance: ($line-height-ratio - $vr-cap-height) / $scale * $vr-font-size; // (px) | |
$offset-top: $offset-top * $vr-grid-unit; // (px) | |
$offset-bottom: $offset-bottom * $vr-grid-unit; // (px) | |
@if ($method == 'relatively') { | |
position: relative; | |
top: em($baseline-distance + $offset-top); | |
padding-bottom: em($offset-bottom); | |
} | |
// http://csswizardry.com/2012/06/single-direction-margin-declarations | |
@if ($method == 'direction-margins') { | |
padding-top: em($baseline-distance + $offset-top); | |
margin-bottom: em($line-height - $baseline-distance - $vr-grid-unit + $offset-bottom); | |
} | |
@if ($method == 'paddings-only') { | |
padding-top: em($baseline-distance + $offset-top); | |
padding-bottom: em($line-height - $baseline-distance - $vr-grid-unit + $offset-bottom); | |
} | |
} | |
.show-baseline { | |
@include show-baseline(); | |
} |
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