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<section class="normal markdown-section">
<h1 id="linear-radial-axis">Linear Radial Axis</h1>
<p>The linear scale is use to chart numerical data. As the name suggests, linear interpolation is used to determine where a value lies in relation the center of the axis.</p>
<p>The following additional configuration options are provided by the radial linear scale.</p>
<h2 id="configuration-options">Configuration Options</h2>
<p>The axis has configuration properties for ticks, angle lines (line that appear in a radar chart outward from the center), pointLabels (labels around the edge in a radar chart). The following sections define each of the properties in those sections.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>angleLines</code></td>
<td><code>Object</code></td>
<td>Angle line configuration. <a href="#angle-line-options">more...</a></td>
</tr>
<tr>
<td><code>gridLines</code></td>
<td><code>Object</code></td>
<td>Grid line configuration. <a href="../styling.html#grid-line-configuration">more...</a></td>
</tr>
<tr>
<td><code>pointLabels</code></td>
<td><code>Object</code></td>
<td>Point label configuration. <a href="#point-label-options">more...</a></td>
</tr>
<tr>
<td><code>ticks</code></td>
<td><code>Object</code></td>
<td>Tick configuration. <a href="#tick-options">more...</a></td>
</tr>
</tbody>
</table>
<h2 id="tick-options">Tick Options</h2>
<p>The following options are provided by the linear scale. They are all located in the <code>ticks</code> sub options. The <a href="../styling.html#tick-configuration">common tick configuration</a> options are supported by this axis.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>backdropColor</code></td>
<td><code>Color</code></td>
<td><code>'rgba(255, 255, 255, 0.75)'</code></td>
<td>Color of label backdrops</td>
</tr>
<tr>
<td><code>backdropPaddingX</code></td>
<td><code>Number</code></td>
<td><code>2</code></td>
<td>Horizontal padding of label backdrop.</td>
</tr>
<tr>
<td><code>backdropPaddingY</code></td>
<td><code>Number</code></td>
<td><code>2</code></td>
<td>Vertical padding of label backdrop.</td>
</tr>
<tr>
<td><code>beginAtZero</code></td>
<td><code>Boolean</code></td>
<td><code>false</code></td>
<td>if true, scale will include 0 if it is not already included.</td>
</tr>
<tr>
<td><code>min</code></td>
<td><code>Number</code></td>
<td></td>
<td>User defined minimum number for the scale, overrides minimum value from data. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>max</code></td>
<td><code>Number</code></td>
<td></td>
<td>User defined maximum number for the scale, overrides maximum value from data. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>maxTicksLimit</code></td>
<td><code>Number</code></td>
<td><code>11</code></td>
<td>Maximum number of ticks and gridlines to show.</td>
</tr>
<tr>
<td><code>precision</code></td>
<td><code>Number</code></td>
<td></td>
<td>if defined and <code>stepSize</code> is not specified, the step size will be rounded to this many decimal places.</td>
</tr>
<tr>
<td><code>stepSize</code></td>
<td><code>Number</code></td>
<td></td>
<td>User defined fixed step size for the scale. <a href="#step-size">more...</a></td>
</tr>
<tr>
<td><code>suggestedMax</code></td>
<td><code>Number</code></td>
<td></td>
<td>Adjustment used when calculating the maximum data value. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>suggestedMin</code></td>
<td><code>Number</code></td>
<td></td>
<td>Adjustment used when calculating the minimum data value. <a href="#axis-range-settings">more...</a></td>
</tr>
<tr>
<td><code>showLabelBackdrop</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td>If true, draw a background behind the tick labels</td>
</tr>
</tbody>
</table>
<h2 id="axis-range-settings">Axis Range Settings</h2>
<p>Given the number of axis range settings, it is important to understand how they all interact with each other.</p>
<p>The <code>suggestedMax</code> and <code>suggestedMin</code> settings only change the data values that are used to scale the axis. These are useful for extending the range of the axis while maintaining the auto fit behaviour.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> minDataValue = <span class="hljs-built_in">Math</span>.min(mostNegativeValue, options.ticks.suggestedMin);
<span class="hljs-keyword">let</span> maxDataValue = <span class="hljs-built_in">Math</span>.max(mostPositiveValue, options.ticks.suggestedMax);
</code></pre>
<p>In this example, the largest positive value is 50, but the data maximum is expanded out to 100. However, because the lowest data value is below the <code>suggestedMin</code> setting, it is ignored.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> chart = <span class="hljs-keyword">new</span> Chart(ctx, {
type: <span class="hljs-string">'radar'</span>,
data: {
datasets: [{
label: <span class="hljs-string">'First dataset'</span>,
data: [<span class="hljs-number">0</span>, <span class="hljs-number">20</span>, <span class="hljs-number">40</span>, <span class="hljs-number">50</span>]
}],
labels: [<span class="hljs-string">'January'</span>, <span class="hljs-string">'February'</span>, <span class="hljs-string">'March'</span>, <span class="hljs-string">'April'</span>]
},
options: {
scale: {
ticks: {
suggestedMin: <span class="hljs-number">50</span>,
suggestedMax: <span class="hljs-number">100</span>
}
}
}
});
</code></pre>
<p>In contrast to the <code>suggested*</code> settings, the <code>min</code> and <code>max</code> settings set explicit ends to the axes. When these are set, some data points may not be visible.</p>
<h2 id="step-size">Step Size</h2>
<p> If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. If not set, the ticks are labeled automatically using the nice numbers algorithm.</p>
<p>This example sets up a chart with a y axis that creates ticks at <code>0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5</code>.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> options = {
scale: {
ticks: {
max: <span class="hljs-number">5</span>,
min: <span class="hljs-number">0</span>,
stepSize: <span class="hljs-number">0.5</span>
}
}
};
</code></pre>
<h2 id="angle-line-options">Angle Line Options</h2>
<p>The following options are used to configure angled lines that radiate from the center of the chart to the point labels. They can be found in the <code>angleLines</code> sub options. Note that these options only apply if <code>angleLines.display</code> is true.</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 true, angle lines are shown</td>
</tr>
<tr>
<td><code>color</code></td>
<td><code>Color</code></td>
<td><code>rgba(0, 0, 0, 0.1)</code></td>
<td>Color of angled lines</td>
</tr>
<tr>
<td><code>lineWidth</code></td>
<td><code>Number</code></td>
<td><code>1</code></td>
<td>Width of angled lines</td>
</tr>
</tbody>
</table>
<h2 id="point-label-options">Point Label Options</h2>
<p>The following options are used to configure the point labels that are shown on the perimeter of the scale. They can be found in the <code>pointLabels</code> sub options. Note that these options only apply if <code>pointLabels.display</code> is true.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>callback</code></td>
<td><code>Function</code></td>
<td></td>
<td>Callback function to transform data labels to point labels. The default implementation simply returns the current string.</td>
</tr>
<tr>
<td><code>fontColor</code></td>
<td><code>Color/Color[]</code></td>
<td><code>'#666'</code></td>
<td>Font color for point labels.</td>
</tr>
<tr>
<td><code>fontFamily</code></td>
<td><code>String</code></td>
<td><code>"'Helvetica Neue', 'Helvetica', 'Arial', sans-serif"</code></td>
<td>Font family to use when rendering labels.</td>
</tr>
<tr>
<td><code>fontSize</code></td>
<td><code>Number</code></td>
<td>10</td>
<td>font size in pixels</td>
</tr>
<tr>
<td><code>fontStyle</code></td>
<td><code>String</code></td>
<td><code>'normal'</code></td>
<td>Font style to use when rendering point labels.</td>
</tr>
</tbody>
</table>
</section>
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