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Elements
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Chart.js API
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<section class="normal markdown-section">
<h1 id="elements">Elements</h1>
<p>While chart types provide settings to configure the styling of each dataset, you sometimes want to style <strong>all datasets the same way</strong>. A common example would be to stroke all of the bars in a bar chart with the same colour but change the fill per dataset. Options can be configured for four different types of elements: <strong><a href="#arc-configuration">arc</a></strong>, <strong><a href="#line-configuration">lines</a></strong>, <strong><a href="#point-configuration">points</a></strong>, and <strong><a href="#rectangle-configuration">rectangles</a></strong>. When set, these options apply to all objects of that type unless specifically overridden by the configuration attached to a dataset.</p>
<h2 id="global-configuration">Global Configuration</h2>
<p>The element options can be specified per chart or globally. The global options for elements are defined in <code>Chart.defaults.global.elements</code>. For example, to set the border width of all bar charts globally you would do:</p>
<pre><code class="lang-javascript">Chart.defaults.global.elements.rectangle.borderWidth = <span class="hljs-number">2</span>;
</code></pre>
<h2 id="point-configuration">Point Configuration</h2>
<p>Point elements are used to represent the points in a line, radar or bubble chart.</p>
<p>Global point options: <code>Chart.defaults.global.elements.point</code>.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>radius</code></td>
<td><code>number</code></td>
<td><code>3</code></td>
<td>Point radius.</td>
</tr>
<tr>
<td><a href="#point-styles"><code>pointStyle</code></a></td>
<td><code>string|Image</code></td>
<td><code>'circle'</code></td>
<td>Point style.</td>
</tr>
<tr>
<td><code>rotation</code></td>
<td><code>number</code></td>
<td><code>0</code></td>
<td>Point rotation (in degrees).</td>
</tr>
<tr>
<td><code>backgroundColor</code></td>
<td><code>Color</code></td>
<td><code>'rgba(0, 0, 0, 0.1)'</code></td>
<td>Point fill color.</td>
</tr>
<tr>
<td><code>borderWidth</code></td>
<td><code>number</code></td>
<td><code>1</code></td>
<td>Point stroke width.</td>
</tr>
<tr>
<td><code>borderColor</code></td>
<td><code>Color</code></td>
<td><code>'rgba(0, 0, 0, 0.1)'</code></td>
<td>Point stroke color.</td>
</tr>
<tr>
<td><code>hitRadius</code></td>
<td><code>number</code></td>
<td><code>1</code></td>
<td>Extra radius added to point radius for hit detection.</td>
</tr>
<tr>
<td><code>hoverRadius</code></td>
<td><code>number</code></td>
<td><code>4</code></td>
<td>Point radius when hovered.</td>
</tr>
<tr>
<td><code>hoverBorderWidth</code></td>
<td><code>number</code></td>
<td><code>1</code></td>
<td>Stroke width when hovered.</td>
</tr>
</tbody>
</table>
<h3 id="point-styles">Point Styles</h3>
<p>The following values are supported:</p>
<ul>
<li><code>'circle'</code></li>
<li><code>'cross'</code></li>
<li><code>'crossRot'</code></li>
<li><code>'dash'</code></li>
<li><code>'line'</code></li>
<li><code>'rect'</code></li>
<li><code>'rectRounded'</code></li>
<li><code>'rectRot'</code></li>
<li><code>'star'</code></li>
<li><code>'triangle'</code></li>
</ul>
<p>If the value is an image, that image is drawn on the canvas using <a href="https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D/drawImage" target="_blank">drawImage</a>.</p>
<h2 id="line-configuration">Line Configuration</h2>
<p>Line elements are used to represent the line in a line chart.</p>
<p>Global line options: <code>Chart.defaults.global.elements.line</code>.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>tension</code></td>
<td><code>number</code></td>
<td><code>0.4</code></td>