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<h1 class="title">Functions</h1>
<h2 class="subtitle">Utility functions to calculate colors and other values</h2>
<hr>
<div class="content">
<p>Bulma uses 5 custom functions to help define the values and colors dynamically:</p>
<ul>
<li><code>powerNumber($number, $exp)</code>: calculates the value of a number exposed to another one. Returns a number.</li>
<li><code>colorLuminance($color)</code>: defines if a color is dark or light. Return a decimal number between 0 and 1 where <= 0.5 is dark and > 0.5 is light.</li>
<li><code>findColorInvert($color)</code>: returns either 70% transparent black or 100% opaque white depending on the luminance of the color.</li>
</ul>
</div>
<hr>
<h2 id="findColorInvert" class="title">The <code>findColorInvert()</code> function</h2>
<div class="content">
<p>The <code>findColorInvert($color)</code> function takes a <strong>color</strong> as an input, and outputs either transparent <strong>black</strong> <code>rgba(#000, 0.7)</code> or <strong>white</strong> <code>#fff</code>:</p>
<ul>
<li>if <code>colorLuminance($color) > 0.55</code>, it outputs <code>rgba(#000, 0.7)</code></li>
<li>otherwise, it outputs <code>#fff</code></li>
</ul>
<p>Its purpose is to guarantee a <strong>readable</strong> shade for the <em>text</em> when the input color is used as the <em>background</em>.</p>
<table class="table is-bordered">
<thead>
<tr>
<th>color</th>
<th>color luminance</th>
<th>findColorInvert()</th>
<th>result</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<span class="color" style="background: #00d1b2;"></span>
<code>#00d1b2</code>
</td>
<td>
<code>0.52831</code>
</td>
<td>
<span class="color" style="background: #fff;"></span>
<code>#fff</code>
</td>
<td>
<a class="button" style="background: #00d1b2; border-color: #00d1b2; color: #fff;">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: #3273dc;"></span>
<code>#3273dc</code>
</td>
<td>
<code>0.23119</code>
</td>
<td>
<span class="color" style="background: #fff;"></span>
<code>#fff</code>
</td>
<td>
<a class="button" style="background: #3273dc; border-color: #3273dc; color: #fff;">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: #23d160;"></span>
<code>#23d160</code>
</td>
<td>
<code>0.51067</code>
</td>
<td>
<span class="color" style="background: #fff;"></span>
<code>#fff</code>
</td>
<td>
<a class="button" style="background: #23d160; border-color: #23d160; color: #fff;">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: #ffdd57;"></span>
<code>#ffdd57</code>
</td>
<td>
<code>0.76863</code>
</td>
<td>
<span class="color" style="background: rgba(0, 0, 0, 0.7);"></span>
<code>rgba(0, 0, 0, 0.7)</code>
</td>
<td>
<a class="button" style="background: #ffdd57; border-color: #ffdd57; color: rgba(0, 0, 0, 0.7);">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: #ff3860;"></span>
<code>#ff3860</code>
</td>
<td>
<code>0.27313</code>
</td>
<td>
<span class="color" style="background: #fff;"></span>
<code>#fff</code>
</td>
<td>
<a class="button" style="background: #ff3860; border-color: #ff3860; color: #fff;">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: #ffb3b3;"></span>
<code>#ffb3b3</code>
</td>
<td>
<code>0.61796</code>
</td>
<td>
<span class="color" style="background: rgba(0,0,0,0.7);"></span>
<code>rgba(0,0,0,0.7)</code>
</td>
<td>
<a class="button" style="background: #ffb3b3; border-color: #ffb3b3; color: rgba(0,0,0,0.7);">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: #ffbc6b;"></span>
<code>#ffbc6b</code>
</td>
<td>
<code>0.63053</code>
</td>
<td>
<span class="color" style="background: rgba(0,0,0,0.7);"></span>
<code>rgba(0,0,0,0.7)</code>
</td>
<td>
<a class="button" style="background: #ffbc6b; border-color: #ffbc6b; color: rgba(0,0,0,0.7);">
Button
</a>
</td>
</tr>
<tr>
<td>
<span class="color" style="background: hsl(294, 71%, 79%);"></span>
<code>hsl(294, 71%, 79%)</code>
</td>
<td>
<code>0.5529</code>
</td>
<td>
<span class="color" style="background: rgba(0,0,0,0.7);"></span>
<code>rgba(0,0,0,0.7)</code>
</td>
<td>
<a class="button" style="background: hsl(294, 71%, 79%); border-color: hsl(294, 71%, 79%); color: rgba(0,0,0,0.7);">
Button
</a>
</td>
</tr>
</tbody>
</table>
<p>
For colors that have a luminance close to the <code>0.55</code> threshold, it can be useful to <strong>override</strong> the <code>findColorInvert()</code> function, and rather set the invert color <strong>manually.</strong>
<br>
For example, this shade of <span class="color" style="background: hsl(294, 71%, 79%); float: none; height: 16px; width: 16px; margin-right: 0; vertical-align: middle;"></span> purple has a color luminance of <code>0.5529</code>. It can be preferable to set a color invert of white instead of transparent black:
</p>
<table class="table is-bordered">
<tbody>
<tr>
<th>
with <code>findColorInvert()</code>
</th>
<td>
<code>$purple-invert: findColorInvert($purple)</code>
</td>
<td>
<span class="color" style="background: rgba(0,0,0,0.7);"></span>
<code>rgba(0,0,0,0.7)</code>
</td>
<td>
<a class="button" style="background: hsl(294, 71%, 79%); border-color: hsl(294, 71%, 79%); color: rgba(0,0,0,0.7);">
Button
</a>
</td>
</tr>
<tr>
<th>
with manual setting
</th>
<td>
<code>$purple-invert: #fff</code>
</td>
<td>
<span class="color" style="background: #fff;"></span>
<code>#fff</code>
</td>
<td>
<a class="button" style="background: hsl(294, 71%, 79%); border-color: hsl(294, 71%, 79%); color: #fff;">
Button
</a>
</td>
</tr>
</tbody>
</table>
</div>
</div>
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