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<title data-rh="true">State Management | react-map-gl</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://visgl.github.io/react-map-gl/docs/get-started/state-management"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="State Management | react-map-gl"><meta data-rh="true" name="description" content="There are two ways to use a Map:"><meta data-rh="true" property="og:description" content="There are two ways to use a Map:"><link data-rh="true" rel="icon" href="/react-map-gl/favicon.png"><link data-rh="true" rel="canonical" href="https://visgl.github.io/react-map-gl/docs/get-started/state-management"><link data-rh="true" rel="alternate" href="https://visgl.github.io/react-map-gl/docs/get-started/state-management" hreflang="en"><link data-rh="true" rel="alternate" href="https://visgl.github.io/react-map-gl/docs/get-started/state-management" hreflang="x-default"><link rel="stylesheet" href="/react-map-gl/assets/css/styles.b9a26a0c.css">
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itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">State Management</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>State Management</h1></header>
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<p>There are two ways to use a <a href="/react-map-gl/docs/api-reference/maplibre/map">Map</a>:</p>
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<ul>
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<li><a href="https://reactjs.org/docs/uncontrolled-components.html" target="_blank" rel="noopener noreferrer">Uncontrolled</a>: The application sets the initial view state (Camera options) when the map is mounted, and the component automatically makes changes to the view states afterwards. This mode works very similarly to the mapbox-gl <code>Map</code> class.</li>
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<li><a href="https://reactjs.org/docs/forms.html#controlled-components" target="_blank" rel="noopener noreferrer">Controlled</a>: The application manages the view state, and pass it to the map via props. The map invokes a callback with a new view state during user interaction transition, and the application can decide what to do with it. This mode is the most powerful when an application has other components that need to interact with the map, or implements its own user input and data handling logic.</li>
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</ul>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="uncontrolled-map">Uncontrolled Map<a href="#uncontrolled-map" class="hash-link" aria-label="Direct link to Uncontrolled Map" title="Direct link to Uncontrolled Map"></a></h2>
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<p>You may clone a full app configuration for this example <a href="https://github.com/visgl/react-map-gl/tree/7.0-release/examples/get-started/basic" target="_blank" rel="noopener noreferrer">here</a>.</p>
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<div class="language-tsx codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-tsx codeBlock_bY9V thin-scrollbar" style="color:#403f53;background-color:#FBFBFB"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token imports operator" style="color:rgb(12, 150, 155)">*</span><span class="token imports"> </span><span class="token imports keyword module" style="color:rgb(12, 150, 155)">as</span><span class="token imports"> </span><span class="token imports maybe-class-name">React</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'react'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token known-class-name class-name" style="color:rgb(17, 17, 17)">Map</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'react-map-gl/maplibre'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">App</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">return</span><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(153, 76, 195)"><</span><span class="token tag class-name" style="color:rgb(17, 17, 17)">Map</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag attr-name" style="color:rgb(72, 118, 214);font-style:italic">initialViewState</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:rgb(153, 76, 195)">=</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> longitude</span><span class="token tag script language-javascript operator" style="color:rgb(12, 150, 155)">:</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> </span><span class="token tag script language-javascript operator" style="color:rgb(12, 150, 155)">-</span><span class="token tag script language-javascript number" style="color:rgb(170, 9, 130)">100</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> latitude</span><span class="token tag script language-javascript operator" style="color:rgb(12, 150, 155)">:</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> </span><span class="token tag script language-javascript number" style="color:rgb(170, 9, 130)">40</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> zoom</span><span class="token tag script language-javascript operator" style="color:rgb(12, 150, 155)">:</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> </span><span class="token tag script language-javascript number" style="color:rgb(170, 9, 130)">3.5</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> </span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag attr-name" style="color:rgb(72, 118, 214);font-style:italic">mapStyle</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(153, 76, 195)">=</span><span class="token tag attr-value punctuation" style="color:rgb(153, 76, 195)">"</span><span class="token tag attr-value" style="color:rgb(153, 76, 195)">mapbox://styles/mapbox/streets-v9</span><span class="token tag attr-value punctuation" style="color:rgb(153, 76, 195)">"</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag punctuation" style="color:rgb(153, 76, 195)">/></span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="controlled-map">Controlled Map<a href="#controlled-map" class="hash-link" aria-label="Direct link to Controlled Map" title="Direct link to Controlled Map"></a></h2>
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<p>You may clone a full app configuration for this example <a href="https://github.com/visgl/react-map-gl/tree/7.0-release/examples/get-started/controlled" target="_blank" rel="noopener noreferrer">here</a>.</p>
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||
<div class="language-tsx codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-tsx codeBlock_bY9V thin-scrollbar" style="color:#403f53;background-color:#FBFBFB"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token imports operator" style="color:rgb(12, 150, 155)">*</span><span class="token imports"> </span><span class="token imports keyword module" style="color:rgb(12, 150, 155)">as</span><span class="token imports"> </span><span class="token imports maybe-class-name">React</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'react'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token known-class-name class-name" style="color:rgb(17, 17, 17)">Map</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'react-map-gl/maplibre'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">App</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token plain">viewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> setViewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token maybe-class-name">React</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">useState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> longitude</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">-</span><span class="token number" style="color:rgb(170, 9, 130)">100</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> latitude</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">40</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> zoom</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">3.5</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">return</span><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(153, 76, 195)"><</span><span class="token tag class-name" style="color:rgb(17, 17, 17)">Map</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag spread punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token tag spread operator" style="color:rgb(12, 150, 155)">...</span><span class="token tag spread" style="color:rgb(153, 76, 195)">viewState</span><span class="token tag spread punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag attr-name" style="color:rgb(72, 118, 214);font-style:italic">onMove</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:rgb(153, 76, 195)">=</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)">evt </span><span class="token tag script language-javascript arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)"> </span><span class="token tag script language-javascript function" style="color:rgb(153, 76, 195);font-style:italic">setViewState</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)">evt</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token tag script language-javascript property-access" style="color:rgb(153, 76, 195)">viewState</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag attr-name" style="color:rgb(72, 118, 214);font-style:italic">mapStyle</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(153, 76, 195)">=</span><span class="token tag attr-value punctuation" style="color:rgb(153, 76, 195)">"</span><span class="token tag attr-value" style="color:rgb(153, 76, 195)">mapbox://styles/mapbox/streets-v9</span><span class="token tag attr-value punctuation" style="color:rgb(153, 76, 195)">"</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag punctuation" style="color:rgb(153, 76, 195)">/></span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
|
||
<p>A real-world application likely uses more complicated state flows:</p>
|
||
<ul>
|
||
<li>Using map with a state store (Redux) <a href="https://github.com/visgl/react-map-gl/tree/7.0-release/examples/get-started/redux" target="_blank" rel="noopener noreferrer">example</a></li>
|
||
<li>Using map with SSR (Next.js) <a href="https://github.com/visgl/react-map-gl/tree/7.0-release/examples/get-started/nextjs" target="_blank" rel="noopener noreferrer">example</a></li>
|
||
</ul>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="custom-camera-constraints">Custom Camera Constraints<a href="#custom-camera-constraints" class="hash-link" aria-label="Direct link to Custom Camera Constraints" title="Direct link to Custom Camera Constraints"></a></h2>
|
||
<p><code>Map</code> offers props that set basic constraints for the camera, e.g. <code>maxBounds</code>, <code>minZoom</code>, <code>maxPitch</code>. If you need more complicated logic to constrain the camera, you may use it as a controlled component. The following example restricts the map center inside a GeoJSON geofence:</p>
|
||
<div class="language-tsx codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-tsx codeBlock_bY9V thin-scrollbar" style="color:#403f53;background-color:#FBFBFB"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token imports operator" style="color:rgb(12, 150, 155)">*</span><span class="token imports"> </span><span class="token imports keyword module" style="color:rgb(12, 150, 155)">as</span><span class="token imports"> </span><span class="token imports maybe-class-name">React</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'react'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token known-class-name class-name" style="color:rgb(17, 17, 17)">Map</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'react-map-gl/maplibre'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// npm install @turf/turf</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">import</span><span class="token plain"> </span><span class="token imports operator" style="color:rgb(12, 150, 155)">*</span><span class="token imports"> </span><span class="token imports keyword module" style="color:rgb(12, 150, 155)">as</span><span class="token imports"> turf</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">from</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'@turf/turf'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// A circle of 5 mile radius of the Empire State Building</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token constant" style="color:rgb(72, 118, 214)">GEOFENCE</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> turf</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">circle</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token operator" style="color:rgb(12, 150, 155)">-</span><span class="token number" style="color:rgb(170, 9, 130)">74.0122106</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">40.7467898</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">5</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain">units</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'miles'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">App</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token plain">viewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> setViewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token maybe-class-name">React</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">useState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> longitude</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">-</span><span class="token number" style="color:rgb(170, 9, 130)">100</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> latitude</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">40</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> zoom</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">3.5</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> onMove </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token maybe-class-name">React</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">useCallback</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain">viewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> newCenter </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token plain">viewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">longitude</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> viewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">latitude</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Only update the view state if the center is inside the geofence</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">if</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">turf</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">booleanPointInPolygon</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">newCenter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token constant" style="color:rgb(72, 118, 214)">GEOFENCE</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">setViewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">viewState</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">return</span><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(153, 76, 195)"><</span><span class="token tag class-name" style="color:rgb(17, 17, 17)">Map</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag spread punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token tag spread operator" style="color:rgb(12, 150, 155)">...</span><span class="token tag spread" style="color:rgb(153, 76, 195)">viewState</span><span class="token tag spread punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag attr-name" style="color:rgb(72, 118, 214);font-style:italic">onMove</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:rgb(153, 76, 195)">=</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token tag script language-javascript" style="color:rgb(153, 76, 195)">onMove</span><span class="token tag script language-javascript punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag attr-name" style="color:rgb(72, 118, 214);font-style:italic">mapStyle</span><span class="token tag attr-value punctuation attr-equals" style="color:rgb(153, 76, 195)">=</span><span class="token tag attr-value punctuation" style="color:rgb(153, 76, 195)">"</span><span class="token tag attr-value" style="color:rgb(153, 76, 195)">mapbox://styles/mapbox/streets-v9</span><span class="token tag attr-value punctuation" style="color:rgb(153, 76, 195)">"</span><span class="token tag" style="color:rgb(153, 76, 195)"></span><br></span><span class="token-line" style="color:#403f53"><span class="token tag" style="color:rgb(153, 76, 195)"> </span><span class="token tag punctuation" style="color:rgb(153, 76, 195)">/></span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a 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