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  195. <a href="../charts/mixed.html">
  196. Mixed
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  198. </li>
  199. </ul>
  200. </li>
  201. <li class="chapter " data-level="1.6" data-path="../axes/">
  202. <a href="../axes/">
  203. Axes
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  206. <li class="chapter " data-level="1.6.1" data-path="../axes/cartesian/">
  207. <a href="../axes/cartesian/">
  208. Cartesian
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  211. <li class="chapter " data-level="1.6.1.1" data-path="../axes/cartesian/category.html">
  212. <a href="../axes/cartesian/category.html">
  213. Category
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  216. <li class="chapter " data-level="1.6.1.2" data-path="../axes/cartesian/linear.html">
  217. <a href="../axes/cartesian/linear.html">
  218. Linear
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  221. <li class="chapter " data-level="1.6.1.3" data-path="../axes/cartesian/logarithmic.html">
  222. <a href="../axes/cartesian/logarithmic.html">
  223. Logarithmic
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  226. <li class="chapter " data-level="1.6.1.4" data-path="../axes/cartesian/time.html">
  227. <a href="../axes/cartesian/time.html">
  228. Time
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  232. </li>
  233. <li class="chapter " data-level="1.6.2" data-path="../axes/radial/">
  234. <a href="../axes/radial/">
  235. Radial
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  238. <li class="chapter " data-level="1.6.2.1" data-path="../axes/radial/linear.html">
  239. <a href="../axes/radial/linear.html">
  240. Linear
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  242. </li>
  243. </ul>
  244. </li>
  245. <li class="chapter " data-level="1.6.3" data-path="../axes/labelling.html">
  246. <a href="../axes/labelling.html">
  247. Labelling
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  249. </li>
  250. <li class="chapter " data-level="1.6.4" data-path="../axes/styling.html">
  251. <a href="../axes/styling.html">
  252. Styling
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  268. <a href="updates.html">
  269. Updating Charts
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  274. Plugins
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  278. <a href="charts.html">
  279. New Charts
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  283. <a href="axes.html">
  284. New Axes
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  328. <!-- Title -->
  329. <h1>
  330. <i class="fa fa-circle-o-notch fa-spin"></i>
  331. <a href=".." >New Axes</a>
  332. </h1>
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  338. <section class="normal markdown-section">
  339. <h1 id="new-axes">New Axes</h1>
  340. <p>Axes in Chart.js can be individually extended. Axes should always derive from Chart.Scale but this is not a mandatory requirement.</p>
  341. <pre><code class="lang-javascript"><span class="hljs-keyword">let</span> MyScale = Chart.Scale.extend({
  342. <span class="hljs-comment">/* extensions ... */</span>
  343. });
  344. <span class="hljs-comment">// MyScale is now derived from Chart.Scale</span>
  345. </code></pre>
  346. <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>
  347. <pre><code class="lang-javascript">Chart.scaleService.registerScaleType(<span class="hljs-string">&apos;myScale&apos;</span>, MyScale, defaultConfigObject);
  348. </code></pre>
  349. <p>To use the new scale, simply pass in the string key to the config when creating a chart.</p>
  350. <pre><code class="lang-javascript"><span class="hljs-keyword">var</span> lineChart = <span class="hljs-keyword">new</span> Chart(ctx, {
  351. data: data,
  352. type: <span class="hljs-string">&apos;line&apos;</span>,
  353. options: {
  354. scales: {
  355. yAxes: [{
  356. 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>
  357. }]
  358. }
  359. }
  360. })
  361. </code></pre>
  362. <h2 id="scale-properties">Scale Properties</h2>
  363. <p>Scale instances are given the following properties during the fitting process.</p>
  364. <pre><code class="lang-javascript">{
  365. left: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// left edge of the scale bounding box</span>
  366. right: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// right edge of the bounding box&apos;</span>
  367. top: <span class="hljs-built_in">Number</span>,
  368. bottom: <span class="hljs-built_in">Number</span>,
  369. width: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// the same as right - left</span>
  370. height: <span class="hljs-built_in">Number</span>, <span class="hljs-comment">// the same as bottom - top</span>
  371. <span class="hljs-comment">// Margin on each side. Like css, this is outside the bounding box.</span>
  372. margins: {
  373. left: <span class="hljs-built_in">Number</span>,
  374. right: <span class="hljs-built_in">Number</span>,
  375. top: <span class="hljs-built_in">Number</span>,
  376. bottom: <span class="hljs-built_in">Number</span>,
  377. },
  378. <span class="hljs-comment">// Amount of padding on the inside of the bounding box (like CSS)</span>
  379. paddingLeft: <span class="hljs-built_in">Number</span>,
  380. paddingRight: <span class="hljs-built_in">Number</span>,
  381. paddingTop: <span class="hljs-built_in">Number</span>,
  382. paddingBottom: <span class="hljs-built_in">Number</span>,
  383. }
  384. </code></pre>
  385. <h2 id="scale-interface">Scale Interface</h2>
  386. <p>To work with Chart.js, custom scale types must implement the following interface.</p>
  387. <pre><code class="lang-javascript">{
  388. <span class="hljs-comment">// Determines the data limits. Should set this.min and this.max to be the data max/min</span>
  389. determineDataLimits: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
  390. <span class="hljs-comment">// Generate tick marks. this.chart is the chart instance. The data object can be accessed as this.chart.data</span>
  391. <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>
  392. buildTicks: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
  393. <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>
  394. getLabelForIndex: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">index, datasetIndex</span>) </span>{},
  395. <span class="hljs-comment">// Get the pixel (x coordinate for horizontal axis, y coordinate for vertical axis) for a given value</span>
  396. <span class="hljs-comment">// @param index: index into the ticks array</span>
  397. <span class="hljs-comment">// @param includeOffset: if true, get the pixel halfway between the given tick and the next</span>
  398. getPixelForTick: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">index, includeOffset</span>) </span>{},
  399. <span class="hljs-comment">// Get the pixel (x coordinate for horizontal axis, y coordinate for vertical axis) for a given value</span>
  400. <span class="hljs-comment">// @param value : the value to get the pixel for</span>
  401. <span class="hljs-comment">// @param index : index into the data array of the value</span>
  402. <span class="hljs-comment">// @param datasetIndex : index of the dataset the value comes from</span>
  403. <span class="hljs-comment">// @param includeOffset : if true, get the pixel halfway between the given tick and the next</span>
  404. getPixelForValue: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">value, index, datasetIndex, includeOffset</span>) </span>{}
  405. <span class="hljs-comment">// Get the value for a given pixel (x coordinate for horizontal axis, y coordinate for vertical axis)</span>
  406. <span class="hljs-comment">// @param pixel : pixel value</span>
  407. getValueForPixel: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">pixel</span>) </span>{}
  408. }
  409. </code></pre>
  410. <p>Optionally, the following methods may also be overwritten, but an implementation is already provided by the <code>Chart.Scale</code> base class.</p>
  411. <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>
  412. convertTicksToLabels: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
  413. <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>
  414. calculateTickRotation: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
  415. <span class="hljs-comment">// Fits the scale into the canvas.</span>
  416. <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>
  417. <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>
  418. <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>
  419. <span class="hljs-comment">// You must set this.width to be the width and this.height to be the height of the scale</span>
  420. fit: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
  421. <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>
  422. <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>
  423. draw: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">chartArea</span>) </span>{},
  424. </code></pre>
  425. <p>The Core.Scale base class also has some utility functions that you may find useful.</p>
  426. <pre><code class="lang-javascript">{
  427. <span class="hljs-comment">// Returns true if the scale instance is horizontal</span>
  428. isHorizontal: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{},
  429. <span class="hljs-comment">// Get the correct value from the value from this.chart.data.datasets[x].data[]</span>
  430. <span class="hljs-comment">// If dataValue is an object, returns .x or .y depending on the return of isHorizontal()</span>
  431. <span class="hljs-comment">// If the value is undefined, returns NaN</span>
  432. <span class="hljs-comment">// Otherwise returns the value.</span>
  433. <span class="hljs-comment">// Note that in all cases, the returned value is not guaranteed to be a Number</span>
  434. getRightValue: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">dataValue</span>) </span>{},
  435. }
  436. </code></pre>
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