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the <a href="https://www.w3.org/TR/2dcontext/" target="_blank" rel="noopener noreferrer">W3C Canvas 2D Context API standard<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>.</p> <h4 id="parameters"><a href="#parameters" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th> <th style="text-align:left;">Description</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>canvas</code></td> <td style="text-align:left;"><code>HTMLCanvasElement</code></td> <td style="text-align:left;">The canvas from which to acquire context (platform specific)</td></tr> <tr><td style="text-align:left;"><code>options?</code></td> <td style="text-align:left;"><code>CanvasRenderingContext2DSettings</code></td> <td style="text-align:left;">The chart options</td></tr></tbody></table> <h4 id="returns"><a href="#returns" class="header-anchor">#</a> Returns</h4> <p><code>CanvasRenderingContext2D</code></p> <h4 id="defined-in"><a href="#defined-in" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L1976" target="_blank" rel="noopener noreferrer">index.esm.d.ts:1976<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></p> <hr> <h3 id="addeventlistener"><a href="#addeventlistener" class="header-anchor">#</a> addEventListener</h3> <p>▸ <strong>addEventListener</strong>(<code>chart</code>, <code>type</code>, <code>listener</code>): <code>void</code></p> <p>Registers the specified listener on the given chart.</p> <h4 id="parameters-2"><a href="#parameters-2" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th> <th style="text-align:left;">Description</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>chart</code></td> <td style="text-align:left;"><a href="/docs/3.6.0/api/classes/Chart.html"><code>Chart</code></a>&lt;keyof <a href="/docs/3.6.0/api/interfaces/ChartTypeRegistry.html"><code>ChartTypeRegistry</code></a>, (<code>number</code> | <a href="/docs/3.6.0/api/interfaces/ScatterDataPoint.html"><code>ScatterDataPoint</code></a> | <a href="/docs/3.6.0/api/interfaces/BubbleDataPoint.html"><code>BubbleDataPoint</code></a>)[], <code>unknown</code>&gt;</td> <td style="text-align:left;">Chart from which to listen for event</td></tr> <tr><td style="text-align:left;"><code>type</code></td> <td style="text-align:left;"><code>string</code></td> <td style="text-align:left;">The (<a href="/docs/3.6.0/api/interfaces/ChartEvent.html">ChartEvent</a>) type to listen for</td></tr> <tr><td style="text-align:left;"><code>listener</code></td> <td style="text-align:left;">(<code>e</code>: <a href="/docs/3.6.0/api/interfaces/ChartEvent.html"><code>ChartEvent</code></a>) =&gt; <code>void</code></td> <td style="text-align:left;">Receives a notification (an object that implements the <a href="/docs/3.6.0/api/interfaces/ChartEvent.html">ChartEvent</a> interface) when an event of the specified type occurs.</td></tr></tbody></table> <h4 id="returns-2"><a href="#returns-2" class="header-anchor">#</a> Returns</h4> <p><code>void</code></p> <h4 id="defined-in-2"><a href="#defined-in-2" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L1994" target="_blank" rel="noopener noreferrer">index.esm.d.ts:1994<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></p> <hr> <h3 id="getdevicepixelratio"><a href="#getdevicepixelratio" class="header-anchor">#</a> getDevicePixelRatio</h3> <p>▸ <strong>getDevicePixelRatio</strong>(): <code>number</code></p> <h4 id="returns-3"><a href="#returns-3" class="header-anchor">#</a> Returns</h4> <p><code>number</code></p> <p>the current devicePixelRatio of the device this platform is connected to.</p> <h4 id="defined-in-3"><a href="#defined-in-3" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L2005" target="_blank" rel="noopener noreferrer">index.esm.d.ts:2005<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></p> <hr> <h3 id="getmaximumsize"><a href="#getmaximumsize" class="header-anchor">#</a> getMaximumSize</h3> <p>▸ <strong>getMaximumSize</strong>(<code>canvas</code>, <code>width?</code>, <code>height?</code>, <code>aspectRatio?</code>): <code>Object</code></p> <h4 id="parameters-3"><a href="#parameters-3" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th> <th style="text-align:left;">Description</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>canvas</code></td> <td style="text-align:left;"><code>HTMLCanvasElement</code></td> <td style="text-align:left;">The canvas for which to calculate the maximum size</td></tr> <tr><td style="text-align:left;"><code>width?</code></td> <td style="text-align:left;"><code>number</code></td> <td style="text-align:left;">-</td></tr> <tr><td style="text-align:left;"><code>height?</code></td> <td style="text-align:left;"><code>number</code></td> <td style="text-align:left;">-</td></tr> <tr><td style="text-align:left;"><code>aspectRatio?</code></td> <td style="text-align:left;"><code>number</code></td> <td style="text-align:left;">-</td></tr></tbody></table> <h4 id="returns-4"><a href="#returns-4" class="header-anchor">#</a> Returns</h4> <p><code>Object</code></p> <p>the maximum size available.</p> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>height</code></td> <td style="text-align:left;"><code>number</code></td></tr> <tr><td style="text-align:left;"><code>width</code></td> <td style="text-align:left;"><code>number</code></td></tr></tbody></table> <h4 id="defined-in-4"><a href="#defined-in-4" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L2013" target="_blank" rel="noopener noreferrer">index.esm.d.ts:2013<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></p> <hr> <h3 id="isattached"><a href="#isattached" class="header-anchor">#</a> isAttached</h3> <p>▸ <strong>isAttached</strong>(<code>canvas</code>): <code>boolean</code></p> <h4 id="parameters-4"><a href="#parameters-4" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>canvas</code></td> <td style="text-align:left;"><code>HTMLCanvasElement</code></td></tr></tbody></table> <h4 id="returns-5"><a href="#returns-5" class="header-anchor">#</a> Returns</h4> <p><code>boolean</code></p> <p>true if the canvas is attached to the platform, false if not.</p> <h4 id="defined-in-5"><a href="#defined-in-5" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L2018" target="_blank" rel="noopener noreferrer">index.esm.d.ts:2018<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></p> <hr> <h3 id="releasecontext"><a href="#releasecontext" class="header-anchor">#</a> releaseContext</h3> <p>▸ <strong>releaseContext</strong>(<code>context</code>): <code>boolean</code></p> <p>Called at chart destruction time, releases any resources associated to the context
previously returned by the acquireContext() method.</p> <h4 id="parameters-5"><a href="#parameters-5" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th> <th style="text-align:left;">Description</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>context</code></td> <td style="text-align:left;"><code>CanvasRenderingContext2D</code></td> <td style="text-align:left;">The context2d instance</td></tr></tbody></table> <h4 id="returns-6"><a href="#returns-6" class="header-anchor">#</a> Returns</h4> <p><code>boolean</code></p> <p>true if the method succeeded, else false</p> <h4 id="defined-in-6"><a href="#defined-in-6" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L1986" target="_blank" rel="noopener noreferrer">index.esm.d.ts:1986<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></p> <hr> <h3 id="removeeventlistener"><a href="#removeeventlistener" class="header-anchor">#</a> removeEventListener</h3> <p>▸ <strong>removeEventListener</strong>(<code>chart</code>, <code>type</code>, <code>listener</code>): <code>void</code></p> <p>Removes the specified listener previously registered with addEventListener.</p> <h4 id="parameters-6"><a href="#parameters-6" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th> <th style="text-align:left;">Description</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>chart</code></td> <td style="text-align:left;"><a href="/docs/3.6.0/api/classes/Chart.html"><code>Chart</code></a>&lt;keyof <a href="/docs/3.6.0/api/interfaces/ChartTypeRegistry.html"><code>ChartTypeRegistry</code></a>, (<code>number</code> | <a href="/docs/3.6.0/api/interfaces/ScatterDataPoint.html"><code>ScatterDataPoint</code></a> | <a href="/docs/3.6.0/api/interfaces/BubbleDataPoint.html"><code>BubbleDataPoint</code></a>)[], <code>unknown</code>&gt;</td> <td style="text-align:left;">Chart from which to remove the listener</td></tr> <tr><td style="text-align:left;"><code>type</code></td> <td style="text-align:left;"><code>string</code></td> <td style="text-align:left;">The (<a href="/docs/3.6.0/api/interfaces/ChartEvent.html">ChartEvent</a>) type to remove</td></tr> <tr><td style="text-align:left;"><code>listener</code></td> <td style="text-align:left;">(<code>e</code>: <a href="/docs/3.6.0/api/interfaces/ChartEvent.html"><code>ChartEvent</code></a>) =&gt; <code>void</code></td> <td style="text-align:left;">The listener function to remove from the event target.</td></tr></tbody></table> <h4 id="returns-7"><a href="#returns-7" class="header-anchor">#</a> Returns</h4> <p><code>void</code></p> <h4 id="defined-in-7"><a href="#defined-in-7" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L2001" target="_blank" rel="noopener noreferrer">index.esm.d.ts:2001<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></p> <hr> <h3 id="updateconfig"><a href="#updateconfig" class="header-anchor">#</a> updateConfig</h3> <p>▸ <strong>updateConfig</strong>(<code>config</code>): <code>void</code></p> <p>Updates config with platform specific requirements</p> <h4 id="parameters-7"><a href="#parameters-7" class="header-anchor">#</a> Parameters</h4> <table><thead><tr><th style="text-align:left;">Name</th> <th style="text-align:left;">Type</th></tr></thead> <tbody><tr><td style="text-align:left;"><code>config</code></td> <td style="text-align:left;"><a href="/docs/3.6.0/api/interfaces/ChartConfiguration.html"><code>ChartConfiguration</code></a>&lt;keyof <a href="/docs/3.6.0/api/interfaces/ChartTypeRegistry.html"><code>ChartTypeRegistry</code></a>, (<code>number</code> | <a href="/docs/3.6.0/api/interfaces/ScatterDataPoint.html"><code>ScatterDataPoint</code></a> | <a href="/docs/3.6.0/api/interfaces/BubbleDataPoint.html"><code>BubbleDataPoint</code></a>)[], <code>unknown</code>&gt;</td></tr></tbody></table> <h4 id="returns-8"><a href="#returns-8" class="header-anchor">#</a> Returns</h4> <p><code>void</code></p> <h4 id="defined-in-8"><a href="#defined-in-8" class="header-anchor">#</a> Defined in</h4> <p><a href="https://github.com/chartjs/Chart.js/blob/40e88ba/types/index.esm.d.ts#L2023" target="_blank" rel="noopener noreferrer">index.esm.d.ts:2023<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></p></div> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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