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<h1 id="area-charts">Area Charts</h1>
<p>Both <a href="line.html">line</a> and <a href="radar.html">radar</a> charts support a <code>fill</code> option on the dataset object which can be used to create area between two datasets or a dataset and a boundary, i.e. the scale <code>origin</code>, <code>start</code> or <code>end</code> (see <a href="#filling-modes">filling modes</a>).</p>
<blockquote>
<p><strong>Note:</strong> this feature is implemented by the <a href="https://github.com/chartjs/Chart.js/blob/master/src/plugins/plugin.filler.js" target="_blank"><code>filler</code> plugin</a>.</p>
</blockquote>
<h2 id="filling-modes">Filling modes</h2>
<table>
<thead>
<tr>
<th style="text-align:left">Mode</th>
<th style="text-align:left">Type</th>
<th style="text-align:left">Values</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Absolute dataset index <sup>1</sup></td>
<td style="text-align:left"><code>Number</code></td>
<td style="text-align:left"><code>1</code>, <code>2</code>, <code>3</code>, ...</td>
</tr>
<tr>
<td style="text-align:left">Relative dataset index <sup>1</sup></td>
<td style="text-align:left"><code>String</code></td>
<td style="text-align:left"><code>'-1'</code>, <code>'-2'</code>, <code>'+1'</code>, ...</td>
</tr>
<tr>
<td style="text-align:left">Boundary <sup>2</sup></td>
<td style="text-align:left"><code>String</code></td>
<td style="text-align:left"><code>'start'</code>, <code>'end'</code>, <code>'origin'</code></td>
</tr>
<tr>
<td style="text-align:left">Disabled <sup>3</sup></td>
<td style="text-align:left"><code>Boolean</code></td>
<td style="text-align:left"><code>false</code></td>
</tr>
</tbody>
</table>
<blockquote>
<p><sup>1</sup> dataset filling modes have been introduced in version 2.6.0<br>
<sup>2</sup> prior version 2.6.0, boundary values was <code>'zero'</code>, <code>'top'</code>, <code>'bottom'</code> (deprecated)<br>
<sup>3</sup> for backward compatibility, <code>fill: true</code> (default) is equivalent to <code>fill: 'origin'</code><br></p>
</blockquote>
<p><strong>Example</strong></p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> Chart(ctx, {
data: {
datasets: [
{fill: <span class="hljs-string">'origin'</span>}, <span class="hljs-comment">// 0: fill to 'origin'</span>
{fill: <span class="hljs-string">'+2'</span>}, <span class="hljs-comment">// 1: fill to dataset 3</span>
{fill: <span class="hljs-number">1</span>}, <span class="hljs-comment">// 2: fill to dataset 1</span>
{fill: <span class="hljs-literal">false</span>}, <span class="hljs-comment">// 3: no fill</span>
{fill: <span class="hljs-string">'-2'</span>} <span class="hljs-comment">// 4: fill to dataset 2</span>
]
}
})
</code></pre>
<h2 id="configuration">Configuration</h2>
<table>
<thead>
<tr>
<th style="text-align:left">Option</th>
<th style="text-align:left">Type</th>
<th style="text-align:left">Default</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left"><a href="#propagate"><code>plugins.filler.propagate</code></a></td>
<td style="text-align:left"><code>Boolean</code></td>
<td style="text-align:left"><code>true</code></td>
<td style="text-align:left">Fill propagation when target is hidden</td>
</tr>
</tbody>
</table>
<h3 id="propagate">propagate</h3>
<p>Boolean (default: <code>true</code>)</p>
<p>If <code>true</code>, the fill area will be recursively extended to the visible target defined by the <code>fill</code> value of hidden dataset targets:</p>
<p><strong>Example</strong></p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> Chart(ctx, {
data: {
datasets: [
{fill: <span class="hljs-string">'origin'</span>}, <span class="hljs-comment">// 0: fill to 'origin'</span>
{fill: <span class="hljs-string">'-1'</span>}, <span class="hljs-comment">// 1: fill to dataset 0</span>
{fill: <span class="hljs-number">1</span>}, <span class="hljs-comment">// 2: fill to dataset 1</span>
{fill: <span class="hljs-literal">false</span>}, <span class="hljs-comment">// 3: no fill</span>
{fill: <span class="hljs-string">'-2'</span>} <span class="hljs-comment">// 4: fill to dataset 2</span>
]
},
options: {
plugins: {
filler: {
propagate: <span class="hljs-literal">true</span>
}
}
}
})
</code></pre>
<p><code>propagate: true</code>:</p>
<ul>
<li>if dataset 2 is hidden, dataset 4 will fill to dataset 1</li>
<li>if dataset 2 and 1 are hidden, dataset 4 will fill to <code>'origin'</code></li>
</ul>
<p><code>propagate: false</code>:</p>
<ul>
<li>if dataset 2 and/or 4 are hidden, dataset 4 will not be filled</li>
</ul>
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