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<h1 id="cartesian-axes">Cartesian Axes</h1>
<p>Axes that follow a cartesian grid are known as 'Cartesian Axes'. Cartesian axes are used for line, bar, and bubble charts. Four cartesian axes are included in Chart.js by default.</p>
<ul>
<li><a href="linear.html#linear-cartesian-axis">linear</a></li>
<li><a href="logarithmic.html#logarithmic-cartesian-axis">logarithmic</a></li>
<li><a href="category.html#category-cartesian-axis">category</a></li>
<li><a href="time.html#time-cartesian-axis">time</a></li>
</ul>
<h1 id="common-configuration">Common Configuration</h1>
<p>All of the included cartesian axes support a number of common options.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>type</code></td>
<td><code>String</code></td>
<td></td>
<td>Type of scale being employed. Custom scales can be created and registered with a string key. This allows changing the type of an axis for a chart.</td>
</tr>
<tr>
<td><code>position</code></td>
<td><code>String</code></td>
<td></td>
<td>Position of the axis in the chart. Possible values are: <code>'top'</code>, <code>'left'</code>, <code>'bottom'</code>, <code>'right'</code></td>
</tr>
<tr>
<td><code>offset</code></td>
<td><code>Boolean</code></td>
<td><code>false</code></td>
<td>If true, extra space is added to the both edges and the axis is scaled to fit into the chart area. This is set to <code>true</code> for a category scale in a bar chart by default.</td>
</tr>
<tr>
<td><code>id</code></td>
<td><code>String</code></td>
<td></td>
<td>The ID is used to link datasets and scale axes together. <a href="#axis-id">more...</a></td>
</tr>
<tr>
<td><code>gridLines</code></td>
<td><code>Object</code></td>
<td></td>
<td>Grid line configuration. <a href="../styling.html#grid-line-configuration">more...</a></td>
</tr>
<tr>
<td><code>scaleLabel</code></td>
<td><code>Object</code></td>
<td></td>
<td>Scale title configuration. <a href="../labelling.html#scale-title-configuration">more...</a></td>
</tr>
<tr>
<td><code>ticks</code></td>
<td><code>Object</code></td>
<td></td>
<td>Tick configuration. <a href="#tick-configuration">more...</a></td>
</tr>
</tbody>
</table>
<h2 id="tick-configuration">Tick Configuration</h2>
<p>The following options are common to all cartesian axes but do not apply to other axes.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>autoSkip</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td>If true, automatically calculates how many labels that can be shown and hides labels accordingly. Turn it off to show all labels no matter what</td>
</tr>
<tr>
<td><code>autoSkipPadding</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>Padding between the ticks on the horizontal axis when <code>autoSkip</code> is enabled. <em>Note: Only applicable to horizontal scales.</em></td>
</tr>
<tr>
<td><code>labelOffset</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>Distance in pixels to offset the label from the centre point of the tick (in the y direction for the x axis, and the x direction for the y axis). <em>Note: this can cause labels at the edges to be cropped by the edge of the canvas</em></td>
</tr>
<tr>
<td><code>maxRotation</code></td>
<td><code>Number</code></td>
<td><code>90</code></td>
<td>Maximum rotation for tick labels when rotating to condense labels. Note: Rotation doesn't occur until necessary. <em>Note: Only applicable to horizontal scales.</em></td>
</tr>
<tr>
<td><code>minRotation</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>Minimum rotation for tick labels. <em>Note: Only applicable to horizontal scales.</em></td>
</tr>
<tr>
<td><code>mirror</code></td>
<td><code>Boolean</code></td>
<td><code>false</code></td>
<td>Flips tick labels around axis, displaying the labels inside the chart instead of outside. <em>Note: Only applicable to vertical scales.</em></td>
</tr>
<tr>
<td><code>padding</code></td>
<td><code>Number</code></td>
<td><code>10</code></td>
<td>Padding between the tick label and the axis. When set on a vertical axis, this applies in the horizontal (X) direction. When set on a horizontal axis, this applies in the vertical (Y) direction.</td>
</tr>
</tbody>
</table>
<h2 id="axis-id">Axis ID</h2>
<p>The properties <code>dataset.xAxisID</code> or <code>dataset.yAxisID</code> have to match the scale properties <code>scales.xAxes.id</code> or <code>scales.yAxes.id</code>. This is especially needed if multi-axes charts are used.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> myChart = <span class="hljs-keyword">new</span> Chart(ctx, {
type: <span class="hljs-string">'line'</span>,
data: {
datasets: [{
<span class="hljs-comment">// This dataset appears on the first axis</span>
yAxisID: <span class="hljs-string">'first-y-axis'</span>
}, {
<span class="hljs-comment">// This dataset appears on the second axis</span>
yAxisID: <span class="hljs-string">'second-y-axis'</span>
}]
},
options: {
scales: {
yAxes: [{
id: <span class="hljs-string">'first-y-axis'</span>,
type: <span class="hljs-string">'linear'</span>
}, {
id: <span class="hljs-string">'second-y-axis'</span>,
type: <span class="hljs-string">'linear'</span>
}]
}
}
});
</code></pre>
<h1 id="creating-multiple-axes">Creating Multiple Axes</h1>
<p>With cartesian axes, it is possible to create multiple X and Y axes. To do so, you can add multiple configuration objects to the <code>xAxes</code> and <code>yAxes</code> properties. When adding new axes, it is important to ensure that you specify the type of the new axes as default types are <strong>not</strong> used in this case.</p>
<p>In the example below, we are creating two Y axes. We then use the <code>yAxisID</code> property to map the datasets to their correct axes.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> myChart = <span class="hljs-keyword">new</span> Chart(ctx, {
type: <span class="hljs-string">'line'</span>,
data: {
datasets: [{
data: [<span class="hljs-number">20</span>, <span class="hljs-number">50</span>, <span class="hljs-number">100</span>, <span class="hljs-number">75</span>, <span class="hljs-number">25</span>, <span class="hljs-number">0</span>],
label: <span class="hljs-string">'Left dataset'</span>,
<span class="hljs-comment">// This binds the dataset to the left y axis</span>
yAxisID: <span class="hljs-string">'left-y-axis'</span>
}, {
data: [<span class="hljs-number">0.1</span>, <span class="hljs-number">0.5</span>, <span class="hljs-number">1.0</span>, <span class="hljs-number">2.0</span>, <span class="hljs-number">1.5</span>, <span class="hljs-number">0</span>],
label: <span class="hljs-string">'Right dataset'</span>,
<span class="hljs-comment">// This binds the dataset to the right y axis</span>
yAxisID: <span class="hljs-string">'right-y-axis'</span>,
}],
labels: [<span class="hljs-string">'Jan'</span>, <span class="hljs-string">'Feb'</span>, <span class="hljs-string">'Mar'</span>, <span class="hljs-string">'Apr'</span>, <span class="hljs-string">'May'</span>, <span class="hljs-string">'Jun'</span>]
},
options: {
scales: {
yAxes: [{
id: <span class="hljs-string">'left-y-axis'</span>,
type: <span class="hljs-string">'linear'</span>,
position: <span class="hljs-string">'left'</span>
}, {
id: <span class="hljs-string">'right-y-axis'</span>,
type: <span class="hljs-string">'linear'</span>,
position: <span class="hljs-string">'right'</span>
}]
}
}
});
</code></pre>
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