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<h1>
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<a href=".." >Elements</a>
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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 chart or a 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</code></td>
<td><code>circle</code></td>
<td>Point style.</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>
<td>Bézier curve tension (<code>0</code> for no Bézier curves).</td>
</tr>
<tr>
<td><code>backgroundColor</code></td>
<td><code>Color</code></td>
<td><code>'rgba(0,0,0,0.1)'</code></td>
<td>Line fill color.</td>
</tr>
<tr>
<td><code>borderWidth</code></td>
<td><code>Number</code></td>
<td><code>3</code></td>
<td>Line 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>Line stroke color.</td>
</tr>
<tr>
<td><code>borderCapStyle</code></td>
<td><code>String</code></td>
<td><code>'butt'</code></td>
<td>Line cap style (see <a href="https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D/lineCap" target="_blank">MDN</a>).</td>
</tr>
<tr>
<td><code>borderDash</code></td>
<td><code>Array</code></td>
<td><code>[]</code></td>
<td>Line dash (see <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash" target="_blank">MDN</a>).</td>
</tr>
<tr>
<td><code>borderDashOffset</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>Line dash offset (see <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset" target="_blank">MDN</a>).</td>
</tr>
<tr>
<td><code>borderJoinStyle</code></td>
<td><code>String</code></td>
<td><code>'miter</code></td>
<td>Line join style (see <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineJoin" target="_blank">MDN</a>).</td>
</tr>
<tr>
<td><code>capBezierPoints</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td><code>true</code> to keep Bézier control inside the chart, <code>false</code> for no restriction.</td>
</tr>
<tr>
<td><code>fill</code></td>
<td><code>Boolean/String</code></td>
<td><code>true</code></td>
<td>Fill location: <code>'zero'</code>, <code>'top'</code>, <code>'bottom'</code>, <code>true</code> (eq. <code>'zero'</code>) or <code>false</code> (no fill).</td>
</tr>
<tr>
<td><code>stepped</code></td>
<td><code>Boolean</code></td>
<td><code>false</code></td>
<td><code>true</code> to show the line as a stepped line (<code>tension</code> will be ignored).</td>
</tr>
</tbody>
</table>
<h2 id="rectangle-configuration">Rectangle Configuration</h2>
<p>Rectangle elements are used to represent the bars in a bar chart.</p>
<p>Global rectangle options: <code>Chart.defaults.global.elements.rectangle</code></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>backgroundColor</code></td>
<td><code>Color</code></td>
<td><code>'rgba(0,0,0,0.1)'</code></td>
<td>Bar fill color.</td>
</tr>
<tr>
<td><code>borderWidth</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>Bar 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>Bar stroke color.</td>
</tr>
<tr>
<td><code>borderSkipped</code></td>
<td><code>String</code></td>
<td><code>'bottom'</code></td>
<td>Skipped (excluded) border: <code>'bottom'</code>, <code>'left'</code>, <code>'top'</code> or <code>'right'</code>.</td>
</tr>
</tbody>
</table>
<h2 id="arc-configuration">Arc Configuration</h2>
<p>Arcs are used in the polar area, doughnut and pie charts.</p>
<p>Global arc options: <code>Chart.defaults.global.elements.arc</code>.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>backgroundColor</code></td>
<td><code>Color</code></td>
<td><code>'rgba(0,0,0,0.1)'</code></td>
<td>Arc fill color.</td>
</tr>
<tr>
<td><code>borderColor</code></td>
<td><code>Color</code></td>
<td><code>'#fff'</code></td>
<td>Arc stroke color.</td>
</tr>
<tr>
<td><code>borderWidth</code></td>
<td><code>Number</code></td>
<td><code>2</code></td>
<td>Arc stroke width.</td>
</tr>
</tbody>
</table>
</section>
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