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<section class="normal markdown-section">
<h1 id="new-axes">New Axes</h1>
<p>Axes in Chart.js can be individually extended. Axes should always derive from <code>Chart.Scale</code> but this is not a mandatory requirement.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">let</span> MyScale = Chart.Scale.extend({
<span class="hljs-comment">/* extensions ... */</span>
});
<span class="hljs-comment">// MyScale is now derived from Chart.Scale</span>
</code></pre>
<p>Once you have created your scale class, you need to register it with the global chart object so that it can be used. A default config for the scale may be provided when registering the constructor. The first parameter to the register function is a string key that is used later to identify which scale type to use for a chart.</p>
<pre><code class="lang-javascript">Chart.scaleService.registerScaleType(<span class="hljs-string">'myScale'</span>, MyScale, defaultConfigObject);
</code></pre>
<p>To use the new scale, simply pass in the string key to the config when creating a chart.</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> lineChart = <span class="hljs-keyword">new</span> Chart(ctx, {
data: data,
type: <span class="hljs-string">'line'</span>,
options: {
scales: {
yAxes: [{
type: <span class="hljs-string">'myScale'</span> <span class="hljs-comment">// this is the same key that was passed to the registerScaleType function</span>
}]
}
}
});
</code></pre>
<h2 id="scale-properties">Scale Properties</h2>
<p>Scale instances are given the following properties during the fitting process.</p>
<pre><code class="lang-javascript">{
left: number, <span class="hljs-comment">// left edge of the scale bounding box</span>
right: number, <span class="hljs-comment">// right edge of the bounding box</span>
top: number,
bottom: number,
width: number, <span class="hljs-comment">// the same as right - left</span>
height: number, <span class="hljs-comment">// the same as bottom - top</span>
<span class="hljs-comment">// Margin on each side. Like css, this is outside the bounding box.</span>
margins: {
left: number,
right: number,
top: number,
bottom: number
},
<span class="hljs-comment">// Amount of padding on the inside of the bounding box (like CSS)</span>
paddingLeft: number,
paddingRight: number,
paddingTop: number,
paddingBottom: number
}
</code></pre>
<h2 id="scale-interface">Scale Interface</h2>
<p>To work with Chart.js, custom scale types must implement the following interface.</p>
<pre><code class="lang-javascript">{
<span class="hljs-comment">// Determines the data limits. Should set this.min and this.max to be the data max/min</span>
determineDataLimits: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
<span class="hljs-comment">// Generate tick marks. this.chart is the chart instance. The data object can be accessed as this.chart.data</span>
<span class="hljs-comment">// buildTicks() should create a ticks array on the axis instance, if you intend to use any of the implementations from the base class</span>
buildTicks: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
<span class="hljs-comment">// Get the value to show for the data at the given index of the the given dataset, ie this.chart.data.datasets[datasetIndex].data[index]</span>
getLabelForIndex: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">index, datasetIndex</span>) </span>{},
<span class="hljs-comment">// Get the pixel (x coordinate for horizontal axis, y coordinate for vertical axis) for a given value</span>
<span class="hljs-comment">// @param index: index into the ticks array</span>
getPixelForTick: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">index</span>) </span>{},
<span class="hljs-comment">// Get the pixel (x coordinate for horizontal axis, y coordinate for vertical axis) for a given value</span>
<span class="hljs-comment">// @param value : the value to get the pixel for</span>
<span class="hljs-comment">// @param index : index into the data array of the value</span>
<span class="hljs-comment">// @param datasetIndex : index of the dataset the value comes from</span>
getPixelForValue: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">value, index, datasetIndex</span>) </span>{},
<span class="hljs-comment">// Get the value for a given pixel (x coordinate for horizontal axis, y coordinate for vertical axis)</span>
<span class="hljs-comment">// @param pixel : pixel value</span>
getValueForPixel: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">pixel</span>) </span>{}
}
</code></pre>
<p>Optionally, the following methods may also be overwritten, but an implementation is already provided by the <code>Chart.Scale</code> base class.</p>
<pre><code class="lang-javascript">{
<span class="hljs-comment">// Transform the ticks array of the scale instance into strings. The default implementation simply calls this.options.ticks.callback(numericalTick, index, ticks);</span>
convertTicksToLabels: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},