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Axes
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<section class="normal markdown-section">
<h1 id="axes">Axes</h1>
<p>Axes are an integral part of a chart. They are used to determine how data maps to a pixel value on the chart. In a cartesian chart, there is 1 or more X axis and 1 or more Y axis to map points onto the 2 dimensional canvas. These axes are know as <a href="cartesian/#cartesian-axes">'cartesian axes'</a>.</p>
<p>In a radial chart, such as a radar chart or a polar area chart, there is a single axis that maps points in the angular and radial directions. These are known as <a href="radial/#radial-axes">'radial axes'</a>.</p>
<p>Scales in Chart.js >V2.0 are significantly more powerful, but also different than those of v1.0.</p>
<ul>
<li>Multiple X & Y axes are supported.</li>
<li>A built-in label auto-skip feature detects would-be overlapping ticks and labels and removes every nth label to keep things displaying normally.</li>
<li>Scale titles are supported</li>
<li>New scale types can be extended without writing an entirely new chart type</li>
</ul>
<h1 id="common-configuration">Common Configuration</h1>
<p>The following properties are common to all axes provided by Chart.js</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>display</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td>If set to <code>false</code> the axis is hidden from view. Overrides <em>gridLines.display</em>, <em>scaleLabel.display</em>, and <em>ticks.display</em>.</td>
</tr>
<tr>
<td><code>callbacks</code></td>
<td><code>Object</code></td>
<td></td>
<td>Callback functions to hook into the axis lifecycle. <a href="#callbacks">more...</a></td>
</tr>
<tr>
<td><code>weight</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>The weight used to sort the axis. Higher weights are further away from the chart area.</td>
</tr>
</tbody>
</table>
<h2 id="callbacks">Callbacks</h2>
<p>There are a number of config callbacks that can be used to change parameters in the scale at different points in the update process.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Arguments</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>beforeUpdate</code></td>
<td><code>axis</code></td>
<td>Callback called before the update process starts.</td>
</tr>
<tr>
<td><code>beforeSetDimensions</code></td>
<td><code>axis</code></td>
<td>Callback that runs before dimensions are set.</td>
</tr>
<tr>
<td><code>afterSetDimensions</code></td>
<td><code>axis</code></td>
<td>Callback that runs after dimensions are set.</td>
</tr>
<tr>
<td><code>beforeDataLimits</code></td>
<td><code>axis</code></td>
<td>Callback that runs before data limits are determined.</td>
</tr>
<tr>
<td><code>afterDataLimits</code></td>
<td><code>axis</code></td>
<td>Callback that runs after data limits are determined.</td>
</tr>
<tr>
<td><code>beforeBuildTicks</code></td>
<td><code>axis</code></td>
<td>Callback that runs before ticks are created.</td>
</tr>
<tr>
<td><code>afterBuildTicks</code></td>
<td><code>axis</code></td>
<td>Callback that runs after ticks are created. Useful for filtering ticks.</td>
</tr>
<tr>
<td><code>beforeTickToLabelConversion</code></td>
<td><code>axis</code></td>
<td>Callback that runs before ticks are converted into strings.</td>
</tr>
<tr>
<td><code>afterTickToLabelConversion</code></td>
<td><code>axis</code></td>
<td>Callback that runs after ticks are converted into strings.</td>
</tr>
<tr>
<td><code>beforeCalculateTickRotation</code></td>
<td><code>axis</code></td>
<td>Callback that runs before tick rotation is determined.</td>
</tr>
<tr>
<td><code>afterCalculateTickRotation</code></td>
<td><code>axis</code></td>
<td>Callback that runs after tick rotation is determined.</td>
</tr>
<tr>
<td><code>beforeFit</code></td>
<td><code>axis</code></td>
<td>Callback that runs before the scale fits to the canvas.</td>
</tr>
<tr>
<td><code>afterFit</code></td>
<td><code>axis</code></td>
<td>Callback that runs after the scale fits to the canvas.</td>
</tr>
<tr>
<td><code>afterUpdate</code></td>
<td><code>axis</code></td>
<td>Callback that runs at the end of the update process.</td>
</tr>
</tbody>
</table>
<h2 id="updating-axis-defaults">Updating Axis Defaults</h2>
<p>The default configuration for a scale can be easily changed using the scale service. All you need to do is to pass in a partial configuration that will be merged with the current scale default configuration to form the new default.</p>
<p>For example, to set the minimum value of 0 for all linear scales, you would do the following. Any linear scales created after this time would now have a minimum of 0.</p>
<pre><code class="lang-javascript">Chart.scaleService.updateScaleDefaults(<span class="hljs-string">'linear'</span>, {
ticks: {
min: <span class="hljs-number">0</span>
}
});
</code></pre>
<h2 id="creating-new-axes">Creating New Axes</h2>
<p>To create a new axis, see the <a href="../developers/axes.html">developer docs</a>.</p>
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