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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>New Charts | Chart.js</title>
<meta name="generator" content="VuePress 1.9.9">
<link rel="icon" href="/docs/latest/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/latest/assets/css/0.styles.6dc2f403.css" as="style"><link rel="preload" href="/docs/latest/assets/js/app.1775731d.js" as="script"><link rel="preload" href="/docs/latest/assets/js/2.2c2b1036.js" as="script"><link rel="preload" href="/docs/latest/assets/js/175.5d366e3d.js" as="script"><link rel="prefetch" href="/docs/latest/assets/js/10.ba172174.js"><link rel="prefetch" href="/docs/latest/assets/js/100.559bdb31.js"><link rel="prefetch" href="/docs/latest/assets/js/101.734a357a.js"><link rel="prefetch" href="/docs/latest/assets/js/102.e53ce872.js"><link rel="prefetch" href="/docs/latest/assets/js/103.9940e4fa.js"><link rel="prefetch" href="/docs/latest/assets/js/104.469f66c7.js"><link rel="prefetch" href="/docs/latest/assets/js/105.5ae465af.js"><link rel="prefetch" href="/docs/latest/assets/js/106.716d6eac.js"><link rel="prefetch" href="/docs/latest/assets/js/107.0833c00c.js"><link rel="prefetch" href="/docs/latest/assets/js/108.d33f5d8a.js"><link 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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><a href="/docs/latest/" aria-current="page" class="sidebar-link">Chart.js</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Getting Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>General</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Configuration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Chart Types</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Axes</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Developers</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/latest/developers/" aria-current="page" class="sidebar-link">Developers</a></li><li><a href="/docs/latest/developers/api.html" class="sidebar-link">API</a></li><li><a href="/docs/latest/developers/axes.html" class="sidebar-link">New Axes</a></li><li><a href="/docs/latest/developers/charts.html" aria-current="page" class="active sidebar-link">New Charts</a></li><li><a href="/docs/latest/developers/contributing.html" class="sidebar-link">Contributing</a></li><li><a href="/docs/latest/developers/plugins.html" class="sidebar-link">Plugins</a></li><li><a href="/docs/latest/developers/publishing.html" class="sidebar-link">Publishing an extension</a></li><li><a href="/docs/latest/api/" class="sidebar-link">TypeDoc</a></li><li><a href="/docs/latest/developers/updates.html" class="sidebar-link">Updating Charts</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Migration</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="new-charts"><a href="#new-charts" class="header-anchor">#</a> New Charts</h1> <p>Chart.js 2.0 introduced the concept of controllers for each dataset. Like scales, new controllers can be written as needed.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">class</span> <span class="token class-name">MyType</span> <span class="token keyword">extends</span> <span class="token class-name">Chart<span class="token punctuation">.</span>DatasetController</span> <span class="token punctuation">{</span>
<span class="token punctuation">}</span>
Chart<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span>MyType<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Now we can create a new instance of our chart, using the Chart.js API</span>
<span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
<span class="token comment">// this is the string the constructor was registered at, ie Chart.controllers.MyType</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'MyType'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">,</span>
<span class="token literal-property property">options</span><span class="token operator">:</span> options
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="dataset-controller-interface"><a href="#dataset-controller-interface" class="header-anchor">#</a> Dataset Controller Interface</h2> <p>Dataset controllers must implement the following interface.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token punctuation">{</span>
<span class="token comment">// Defaults for charts of this type</span>
<span class="token literal-property property">defaults</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token comment">// If set to `false` or `null`, no dataset level element is created.</span>
<span class="token comment">// If set to a string, this is the type of element to create for the dataset.</span>
<span class="token comment">// For example, a line create needs to create a line element so this is the string 'line'</span>
<span class="token literal-property property">datasetElementType</span><span class="token operator">:</span> string <span class="token operator">|</span> <span class="token keyword">null</span> <span class="token operator">|</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// If set to `false` or `null`, no elements are created for each data value.</span>
<span class="token comment">// If set to a string, this is the type of element to create for each data value.</span>
<span class="token comment">// For example, a line create needs to create a point element so this is the string 'point'</span>
<span class="token literal-property property">dataElementType</span><span class="token operator">:</span> string <span class="token operator">|</span> <span class="token keyword">null</span> <span class="token operator">|</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
<span class="token comment">// ID of the controller</span>
<span class="token literal-property property">id</span><span class="token operator">:</span> string<span class="token punctuation">;</span>
<span class="token comment">// Update the elements in response to new data</span>
<span class="token comment">// @param mode : update mode, core calls this method using any of `'active'`, `'hide'`, `'reset'`, `'resize'`, `'show'` or `undefined`</span>
<span class="token function-variable function">update</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">mode</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>The following methods may optionally be overridden by derived dataset controllers.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token punctuation">{</span>
<span class="token comment">// Draw the representation of the dataset. The base implementation works in most cases, and an example of a derived version</span>
<span class="token comment">// can be found in the line controller</span>
<span class="token function-variable function">draw</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token comment">// Initializes the controller</span>
<span class="token function-variable function">initialize</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token comment">// Ensures that the dataset represented by this controller is linked to a scale. Overridden to helpers.noop in the polar area and doughnut controllers as these</span>
<span class="token comment">// chart types using a single scale</span>
<span class="token function-variable function">linkScales</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token comment">// Parse the data into the controller meta data. The default implementation will work for cartesian parsing, but an example of an overridden</span>
<span class="token comment">// version can be found in the doughnut controller</span>
<span class="token function-variable function">parse</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">start<span class="token punctuation">,</span> count</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="extending-existing-chart-types"><a href="#extending-existing-chart-types" class="header-anchor">#</a> Extending Existing Chart Types</h2> <p>Extending or replacing an existing controller type is easy. Simply replace the constructor for one of the built-in types with your own.</p> <p>The built-in controller types are:</p> <ul><li><code>BarController</code></li> <li><code>BubbleController</code></li> <li><code>DoughnutController</code></li> <li><code>LineController</code></li> <li><code>PieController</code></li> <li><code>PolarAreaController</code></li> <li><code>RadarController</code></li> <li><code>ScatterController</code></li></ul> <p>These controllers are also available in the UMD package, directly under <code>Chart</code>. Eg: <code>Chart.BarController</code>.</p> <p>For example, to derive a new chart type that extends from a bubble chart, you would do the following.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span>BubbleController<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'chart.js'</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">Custom</span> <span class="token keyword">extends</span> <span class="token class-name">BubbleController</span> <span class="token punctuation">{</span>
<span class="token function">draw</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Call bubble controller method to draw all the points</span>
<span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">draw</span><span class="token punctuation">(</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Now we can do some custom drawing for this dataset. Here we'll draw a red box around the first point in each dataset</span>
<span class="token keyword">const</span> meta <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getMeta</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> pt0 <span class="token operator">=</span> meta<span class="token punctuation">.</span>data<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token punctuation">{</span>x<span class="token punctuation">,</span> y<span class="token punctuation">}</span> <span class="token operator">=</span> pt0<span class="token punctuation">.</span><span class="token function">getProps</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">'x'</span><span class="token punctuation">,</span> <span class="token string">'y'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token punctuation">{</span>radius<span class="token punctuation">}</span> <span class="token operator">=</span> pt0<span class="token punctuation">.</span>options<span class="token punctuation">;</span>
<span class="token keyword">const</span> ctx <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>chart<span class="token punctuation">.</span>ctx<span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span><span class="token function">save</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span>strokeStyle <span class="token operator">=</span> <span class="token string">'red'</span><span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span>lineWidth <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span><span class="token function">strokeRect</span><span class="token punctuation">(</span>x <span class="token operator">-</span> radius<span class="token punctuation">,</span> y <span class="token operator">-</span> radius<span class="token punctuation">,</span> <span class="token number">2</span> <span class="token operator">*</span> radius<span class="token punctuation">,</span> <span class="token number">2</span> <span class="token operator">*</span> radius<span class="token punctuation">)</span><span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span><span class="token function">restore</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
Custom<span class="token punctuation">.</span>id <span class="token operator">=</span> <span class="token string">'derivedBubble'</span><span class="token punctuation">;</span>
Custom<span class="token punctuation">.</span>defaults <span class="token operator">=</span> BubbleController<span class="token punctuation">.</span>defaults<span class="token punctuation">;</span>
<span class="token comment">// Stores the controller so that the chart initialization routine can look it up</span>
Chart<span class="token punctuation">.</span><span class="token function">register</span><span class="token punctuation">(</span>Custom<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Now we can create and use our new chart type</span>
<span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'derivedBubble'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">,</span>
<span class="token literal-property property">options</span><span class="token operator">:</span> options
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="typescript-typings"><a href="#typescript-typings" class="header-anchor">#</a> TypeScript Typings</h2> <p>If you want your new chart type to be statically typed, you must provide a <code>.d.ts</code> TypeScript declaration file. Chart.js provides a way to augment built-in types with user-defined ones, by using the concept of "declaration merging".</p> <p>When adding a new chart type, <code>ChartTypeRegistry</code> must contain the declarations for the new type, either by extending an existing entry in <code>ChartTypeRegistry</code> or by creating a new one.</p> <p>For example, to provide typings for a new chart type that extends from a bubble chart, you would add a <code>.d.ts</code> containing:</p> <div class="language-typescript extra-class"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> ChartTypeRegistry <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'chart.js'</span><span class="token punctuation">;</span>
<span class="token keyword">declare</span> <span class="token keyword">module</span> <span class="token string">'chart.js'</span> <span class="token punctuation">{</span>
<span class="token keyword">interface</span> <span class="token class-name">ChartTypeRegistry</span> <span class="token punctuation">{</span>
derivedBubble<span class="token operator">:</span> ChartTypeRegistry<span class="token punctuation">[</span><span class="token string">'bubble'</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
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