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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">&apos;myScale&apos;</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">&apos;line&apos;</span>,
    options: {
        scales: {
            yAxes: [{
                type: <span class="hljs-string">&apos;myScale&apos;</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>{},

    <span class="hljs-comment">// Determine how much the labels will rotate by. The default implementation will only rotate labels if the scale is horizontal.</span>
    calculateTickRotation: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},

    <span class="hljs-comment">// Fits the scale into the canvas.</span>
    <span class="hljs-comment">// this.maxWidth and this.maxHeight will tell you the maximum dimensions the scale instance can be. Scales should endeavour to be as efficient as possible with canvas space.</span>
    <span class="hljs-comment">// this.margins is the amount of space you have on either side of your scale that you may expand in to. This is used already for calculating the best label rotation</span>
    <span class="hljs-comment">// You must set this.minSize to be the size of your scale. It must be an object containing 2 properties: width and height.</span>
    <span class="hljs-comment">// You must set this.width to be the width and this.height to be the height of the scale</span>
    fit: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},

    <span class="hljs-comment">// Draws the scale onto the canvas. this.(left|right|top|bottom) will have been populated to tell you the area on the canvas to draw in</span>
    <span class="hljs-comment">// @param chartArea : an object containing four properties: left, right, top, bottom. This is the rectangle that lines, bars, etc will be drawn in. It may be used, for example, to draw grid lines.</span>
    draw: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">chartArea</span>) </span>{}
}
</code></pre>
<p>The Core.Scale base class also has some utility functions that you may find useful.</p>
<pre><code class="lang-javascript">{
    <span class="hljs-comment">// Returns true if the scale instance is horizontal</span>
    isHorizontal: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},

    <span class="hljs-comment">// Get the correct value from the value from this.chart.data.datasets[x].data[]</span>
    <span class="hljs-comment">// If dataValue is an object, returns .x or .y depending on the return of isHorizontal()</span>
    <span class="hljs-comment">// If the value is undefined, returns NaN</span>
    <span class="hljs-comment">// Otherwise returns the value.</span>
    <span class="hljs-comment">// Note that in all cases, the returned value is not guaranteed to be a number</span>
    getRightValue: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">dataValue</span>) </span>{},

    <span class="hljs-comment">// Returns the scale tick objects ({label, major})</span>
    getTicks: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{}
}
</code></pre>

                                
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