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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Su: Core Math Engine | Susy Documentation</title>
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<link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:400,600|Source+Sans+Pro:400,400i,700,700i" rel="stylesheet">
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<main data-region="main">
<nav class="breadcrumb">
<a href="index.html" >Susy</a> »
<strong>Su: Core Math Engine</strong>
</nav>
<div data-page="su-math">
<section class="item" >
<div data-item-section="prose" class="text-block">
<h1 id="grid-math-engine">Grid Math Engine</h1>
<p>The <code>su</code> functions give you direct access to the math layer,
without any syntax-sugar like shorthand parsing, and normalization.
If you prefer named arguments, and stripped-down syntax,
you can use these functions directly in your code –
replacing <code>span</code>, <code>gutter</code>, and <code>slice</code>.</p>
<p>These functions are also useful
for building mixins or other extensions to Susy.
Apply the Susy syntax to new mixins and functions,
using our “Plugin Helpers”,
or write your own syntax and pass the normalized results along
to <code>su</code> for compilation.</p>
</div>
<div data-item-section="related">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Related</span>
</h3>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-span" class="item-name">su-span()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-gutter" class="item-name">su-gutter()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-slice" class="item-name">su-slice()</a>
</h4>
</div>
</div>
</section>
<section class="item" id="function--su-span">
<div data-item-section="header">
<h2 class="item-title">
<span class="item-type">@function</span>
<a href="#function--su-span" class="item-name">su-span()</a>
</h2>
<div class="text-block">
<p>Calculates and returns a CSS-ready span width,
based on normalized span and context data –
a low-level version of <code>susy-span</code>,
with all of the logic and none of the syntax<span class="widont"> </span>sugar.</p>
<ul>
<li>Grids defined with unitless numbers will return <code>%</code> values.</li>
<li>Grids defined with comparable units
will return a value in the units<span class="widont"> </span>provided.</li>
<li>Grids defined with a mix of units,
or a combination of untiless numbers and unit-lengths,
will return a <code>calc()</code> string.</li>
</ul>
</div>
</div>
<div data-item-section="parameter">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Parameters &<span class="widont"> </span>Return</span>
</h3>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$span:</span>
<span class="value-type">(number |<span class="widont"> </span>list)</span>
</h4>
<div class="param-details text-block">
<p>Number or list of grid columns to<span class="widont"> </span>span</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$columns:</span>
<span class="value-type">(list)</span>
</h4>
<div class="param-details text-block">
<p>List of columns<span class="widont"> </span>available</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$gutters:</span>
<span class="value-type">(number)</span>
</h4>
<div class="param-details text-block">
<p>Width of a gutter in column-comparable<span class="widont"> </span>units</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$spread:</span>
<span class="value-type">(0 | 1 |<span class="widont"> </span>-1)</span>
</h4>
<div class="param-details text-block">
<p>Number of gutters spanned,
relative to <code>span</code> count</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$container-spread:</span>
<span class="item-value">$spread</span>
<span class="value-type">(0 | 1 |<span class="widont"> </span>-1)</span>
</h4>
<div class="param-details text-block">
<p>Number of gutters spanned,
relative to <code>columns</code> count</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$location:</span>
<span class="item-value">1</span>
<span class="value-type">(integer)</span>
</h4>
<div class="param-details text-block">
<p>Optional position of sub-span among full set of<span class="widont"> </span>columns</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">@return</span>
<span class="value-type">(length)</span>
</h4>
<div class="param-details text-block">
<p>Relative or static length of a span on the<span class="widont"> </span>grid</p>
</div>
</div>
</div>
<div data-item-section="related">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Related</span>
</h3>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
api.html#function--susy-span" class="item-name">susy-span()</a>
</h4>
</div>
</div>
<div class="requires-wrapper">
<div data-item-section="requires">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Requires</span>
</h3>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
_validation.html#function--su-valid-span" class="item-name">su-valid-span()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
_validation.html#function--su-valid-columns" class="item-name">su-valid-columns()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
_validation.html#function--su-valid-gutters" class="item-name">su-valid-gutters()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
_validation.html#function--su-valid-spread" class="item-name">su-valid-spread()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
_validation.html#function--su-valid-location" class="item-name">su-valid-location()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-slice" class="item-name">su-slice()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<span class="item-name">_su-needs-calc-output()</span>