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href=".." >New Axes</a>    </h1></div>                    <div class="page-wrapper" tabindex="-1" role="main">                        <div class="page-inner">                            <div class="search-plus" id="book-search-results">    <div class="search-noresults">                                    <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 Chart.Scale 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: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// left edge of the scale bounding box</span>    right: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// right edge of the bounding box'</span>    top: <span class="hljs-built_in">Number</span>,    bottom: <span class="hljs-built_in">Number</span>,    width: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// the same as right - left</span>    height: <span class="hljs-built_in">Number</span>, <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: <span class="hljs-built_in">Number</span>,        right: <span class="hljs-built_in">Number</span>,        top: <span class="hljs-built_in">Number</span>,        bottom: <span class="hljs-built_in">Number</span>,    },    <span class="hljs-comment">// Amount of padding on the inside of the bounding box (like CSS)</span>    paddingLeft: <span class="hljs-built_in">Number</span>,    paddingRight: <span class="hljs-built_in">Number</span>,    paddingTop: <span class="hljs-built_in">Number</span>,    paddingBottom: <span class="hljs-built_in">Number</span>,}</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>    <span class="hljs-comment">// @param includeOffset: if true, get the pixel halfway between the given tick and the next</span>    getPixelForTick: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">index, includeOffset</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>    <span class="hljs-comment">// @param includeOffset : if true, get the pixel halfway between the given tick and the next</span>    getPixelForValue: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">value, index, datasetIndex, includeOffset</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>{},}</code></pre>                                                                </section>                                </div>    <div class="search-results">        <div class="has-results">                        <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1>            <ul class="search-results-list"></ul>                    </div>        <div class="no-results">                        <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1>                    </div>    </div></div>                        </div>                    </div>                            </div>                                            <a href="charts.html" class="navigation navigation-prev " aria-label="Previous page: New Charts">                    <i class="fa fa-angle-left"></i>                </a>                                                <a href="contributing.html" class="navigation navigation-next " aria-label="Next page: Contributing">                    <i class="fa fa-angle-right"></i>                </a>                                        </div>    <script>        var gitbook = gitbook || []; 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