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39 KiB
HTML
<!DOCTYPE html><html><head><meta charSet="utf-8"/><meta http-equiv="x-ua-compatible" content="ie=edge"/><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/><meta name="generator" content="Gatsby 2.32.0"/><title data-react-helmet="true">react-map-gl | State Management</title><link data-react-helmet="true" rel="stylesheet" href="https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.css" type="text/css"/><link data-react-helmet="true" rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.3.0/mapbox-gl-draw.css" type="text/css"/><link data-react-helmet="true" rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.7.2/mapbox-gl-geocoder.css" type="text/css"/><link data-react-helmet="true" rel="stylesheet" href="/react-map-gl/style.css" type="text/css"/><link data-react-helmet="true" rel="icon" type="img/ico" href="favicon.ico"/><meta data-react-helmet="true" name="description" content="React wrapper for Mapbox GL JS"/><meta data-react-helmet="true" name="image" content="https://github.com/visgl/images/hero-sm.jpg"/><meta data-react-helmet="true" property="og:url" content="https://github.com/visgl/*"/><meta data-react-helmet="true" property="og:type" content="article"/><meta data-react-helmet="true" property="og:title" content="react-map-gl | State Management"/><meta data-react-helmet="true" property="og:description" content="React wrapper for Mapbox GL JS"/><meta data-react-helmet="true" property="og:image" content="https://github.com/visgl/images/hero-sm.jpg"/><meta data-react-helmet="true" property="fb:app_id" content=""/><meta data-react-helmet="true" name="twitter:card" content="summary_large_image"/><meta data-react-helmet="true" name="twitter:creator" content=""/><meta data-react-helmet="true" name="twitter:title" content="react-map-gl | State Management"/><meta data-react-helmet="true" name="twitter:description" content="React wrapper for Mapbox GL JS"/><meta data-react-helmet="true" name="twitter:image" content="https://github.com/visgl/images/hero-sm.jpg"/><script data-react-helmet="true" type="application/ld+json">[{"@context":"http://schema.org","@type":"WebSite","url":"https://github.com/visgl","name":"react-map-gl"},[{"@context":"http://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https://github.com/visgl/*","name":"react-map-gl | State Management","image":"https://github.com/visgl/images/hero-sm.jpg"}}]},{"@context":"http://schema.org","@type":"BlogPosting","url":"https://github.com/visgl","name":"react-map-gl | State Management","headline":"react-map-gl | State Management","image":{"@type":"ImageObject","url":"https://github.com/visgl/images/hero-sm.jpg"},"description":"React wrapper for Mapbox GL JS"}]]</script><script data-react-helmet="true" async="" src="https://www.googletagmanager.com/gtag/js?id=UA-74374017-2"></script><style data-styled="ckjqBY kTxBVF hLObhf jcCSEG bdPEit dkfbFn isdBno ljEIIX cqPqff FcGip femPON cowmvG eYbFBV idNLwm iTIrjR dMTgn dvhuEd cncNYa dMoEUD hsOfQe kVRSNy egvBsN jYCwIr fPGooQ" data-styled-version="4.4.1">
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</script><link as="script" rel="preload" href="/react-map-gl/webpack-runtime-53e1d5786ef6c6593773.js"/><link as="script" rel="preload" href="/react-map-gl/framework-47a7447cd78cae046a8b.js"/><link as="script" rel="preload" href="/react-map-gl/app-c33704d3a1abd6ea3046.js"/><link as="script" rel="preload" href="/react-map-gl/component---node-modules-gatsby-theme-ocular-src-react-templates-documentation-jsx-298d6a55a92e5d120c0e.js"/><link as="fetch" rel="preload" href="/react-map-gl/page-data/docs/get-started/state-management/page-data.json" crossorigin="anonymous"/><link as="fetch" rel="preload" href="/react-map-gl/page-data/sq/d/484347790.json" crossorigin="anonymous"/><link as="fetch" rel="preload" href="/react-map-gl/page-data/app-data.json" crossorigin="anonymous"/></head><body><div id="___gatsby"><div style="outline:none" tabindex="-1" id="gatsby-focus-wrapper"><div><div class="body__Body-lvm4v2-3 ckjqBY"><div class="header__HeaderContainer-sc-3r2dxq-1 kTxBVF"><div></div></div><div class="toc__TocContainer-c2gnov-5 hLObhf"><div><div title="Introduction" class="toc__TocEntry-c2gnov-1 jcCSEG"><svg viewBox="0 0 24 24" class="toc__TocChevron-c2gnov-0 isdBno" width="24" height="24"><title>Chevron Down</title><path transform="rotate(270, 12, 12)" fill-rule="evenodd" clip-rule="evenodd" d="M9 12C9 12.2652 9.10536 12.5196 9.29289 12.7071L13.2929 16.7071C13.6834 17.0976 14.3166 17.0976 14.7071 16.7071C15.0976 16.3166 15.0976 15.6834 14.7071 15.2929L11.4142 12L14.7071 8.70711C15.0976 8.31658 15.0976 7.68342 14.7071 7.29289C14.3166 6.90237 13.6834 6.90237 13.2929 7.29289L9.29289 11.2929C9.10536 11.4804 9 11.7348 9 12Z"></path></svg><span class="toc__TocHeader-c2gnov-2 cqPqff">Introduction</span></div><ul class="toc__TocSubpages-c2gnov-4 FcGip"><div><li><div title="Introduction" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Introduction" href="/react-map-gl/docs">Introduction</a></div></div></li></div><div><li><div title="What's new" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="What's new" href="/react-map-gl/docs/whats-new">What's new</a></div></div></li></div><div><li><div title="Upgrade Guide" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Upgrade Guide" href="/react-map-gl/docs/upgrade-guide">Upgrade Guide</a></div></div></li></div><div><li><div title="Contributing to react-map-gl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Contributing to react-map-gl" href="/react-map-gl/docs/contributing">Contributing to react-map-gl</a></div></div></li></div></ul></div><div><div title="Developer Guide" class="toc__TocEntry-c2gnov-1 dkfbFn"><svg viewBox="0 0 24 24" class="toc__TocChevron-c2gnov-0 ljEIIX" width="24" height="24"><title>Chevron Down</title><path transform="rotate(270, 12, 12)" fill-rule="evenodd" clip-rule="evenodd" d="M9 12C9 12.2652 9.10536 12.5196 9.29289 12.7071L13.2929 16.7071C13.6834 17.0976 14.3166 17.0976 14.7071 16.7071C15.0976 16.3166 15.0976 15.6834 14.7071 15.2929L11.4142 12L14.7071 8.70711C15.0976 8.31658 15.0976 7.68342 14.7071 7.29289C14.3166 6.90237 13.6834 6.90237 13.2929 7.29289L9.29289 11.2929C9.10536 11.4804 9 11.7348 9 12Z"></path></svg><span class="toc__TocHeader-c2gnov-2 cqPqff">Developer Guide</span></div><ul class="toc__TocSubpages-c2gnov-4 femPON"><div><li><div title="Get Started" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Get Started" href="/react-map-gl/docs/get-started/get-started">Get Started</a></div></div></li></div><div><li><div title="About Mapbox Tokens" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="About Mapbox Tokens" href="/react-map-gl/docs/get-started/mapbox-tokens">About Mapbox Tokens</a></div></div></li></div><div><li><div title="State Management" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 eYbFBV"><a aria-current="page" title="State Management" class="" href="/react-map-gl/docs/get-started/state-management">State Management</a></div></div></li></div><div><li><div title="Adding Custom Data" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Adding Custom Data" href="/react-map-gl/docs/get-started/adding-custom-data">Adding Custom Data</a></div></div></li></div><div><li><div title="Tips and Tricks" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Tips and Tricks" href="/react-map-gl/docs/get-started/tips-and-tricks">Tips and Tricks</a></div></div></li></div></ul></div><div><div title="API Reference" class="toc__TocEntry-c2gnov-1 dkfbFn"><svg viewBox="0 0 24 24" class="toc__TocChevron-c2gnov-0 isdBno" width="24" height="24"><title>Chevron Down</title><path transform="rotate(270, 12, 12)" fill-rule="evenodd" clip-rule="evenodd" d="M9 12C9 12.2652 9.10536 12.5196 9.29289 12.7071L13.2929 16.7071C13.6834 17.0976 14.3166 17.0976 14.7071 16.7071C15.0976 16.3166 15.0976 15.6834 14.7071 15.2929L11.4142 12L14.7071 8.70711C15.0976 8.31658 15.0976 7.68342 14.7071 7.29289C14.3166 6.90237 13.6834 6.90237 13.2929 7.29289L9.29289 11.2929C9.10536 11.4804 9 11.7348 9 12Z"></path></svg><span class="toc__TocHeader-c2gnov-2 cqPqff">API Reference</span></div><ul class="toc__TocSubpages-c2gnov-4 FcGip"><div><li><div title="default (Map)" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="default (Map)" href="/react-map-gl/docs/api-reference/map">default (Map)</a></div></div></li></div><div><li><div title="AttributionControl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="AttributionControl" href="/react-map-gl/docs/api-reference/attribution-control">AttributionControl</a></div></div></li></div><div><li><div title="FullscreenControl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="FullscreenControl" href="/react-map-gl/docs/api-reference/fullscreen-control">FullscreenControl</a></div></div></li></div><div><li><div title="GeolocateControl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="GeolocateControl" href="/react-map-gl/docs/api-reference/geolocate-control">GeolocateControl</a></div></div></li></div><div><li><div title="Layer" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Layer" href="/react-map-gl/docs/api-reference/layer">Layer</a></div></div></li></div><div><li><div title="MapProvider" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="MapProvider" href="/react-map-gl/docs/api-reference/map-provider">MapProvider</a></div></div></li></div><div><li><div title="Marker" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Marker" href="/react-map-gl/docs/api-reference/marker">Marker</a></div></div></li></div><div><li><div title="NavigationControl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="NavigationControl" href="/react-map-gl/docs/api-reference/navigation-control">NavigationControl</a></div></div></li></div><div><li><div title="Popup" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Popup" href="/react-map-gl/docs/api-reference/popup">Popup</a></div></div></li></div><div><li><div title="ScaleControl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="ScaleControl" href="/react-map-gl/docs/api-reference/scale-control">ScaleControl</a></div></div></li></div><div><li><div title="Source" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Source" href="/react-map-gl/docs/api-reference/source">Source</a></div></div></li></div><div><li><div title="useControl" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="useControl" href="/react-map-gl/docs/api-reference/use-control">useControl</a></div></div></li></div><div><li><div title="useMap" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="useMap" href="/react-map-gl/docs/api-reference/use-map">useMap</a></div></div></li></div><div><li><div title="Types" class="toc__TocEntry-c2gnov-1 bdPEit"><div class="toc__TocLink-c2gnov-3 cowmvG"><a title="Types" href="/react-map-gl/docs/api-reference/types">Types</a></div></div></li></div></ul></div></div><div class="body__BodyContainerToC-lvm4v2-1 idNLwm"><div style="position:relative"><div class="typography__MarkdownBody-sc-1pmaksm-11 iTIrjR"><h1 id="state-management" style="position:relative" class="typography__H1-sc-1pmaksm-2 dMTgn"><a href="#state-management" aria-label="state management permalink" class="typography__A-sc-1pmaksm-0 dvhuEd anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>State Management</h1><p class="typography__P-sc-1pmaksm-8 cncNYa">There are two ways to use a <a class="typography__GatsbyA-sc-1pmaksm-1 dMoEUD" href="/react-map-gl/docs/api-reference/map">Map</a>:</p><ul class="typography__List-sc-1pmaksm-9 hsOfQe"><li class="typography__ListItem-sc-1pmaksm-10 kVRSNy"><a href="https://reactjs.org/docs/uncontrolled-components.html" class="typography__A-sc-1pmaksm-0 dvhuEd">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 class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-text">Map</code> class.</li><li class="typography__ListItem-sc-1pmaksm-10 kVRSNy"><a href="https://reactjs.org/docs/forms.html#controlled-components" class="typography__A-sc-1pmaksm-0 dvhuEd">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></ul><h2 style="position:relative" id="uncontrolled-map" class="typography__H2-sc-1pmaksm-3 jYCwIr"><a href="#uncontrolled-map" aria-label="uncontrolled map permalink" class="typography__A-sc-1pmaksm-0 dvhuEd anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Uncontrolled Map</h2><p class="typography__P-sc-1pmaksm-8 cncNYa">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" class="typography__A-sc-1pmaksm-0 dvhuEd">here</a>.</p><div class="gatsby-highlight" data-language="js"><pre class="typography__Pre-sc-1pmaksm-14 fPGooQ language-js"><code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-js"><span class="token keyword">import</span> <span class="token operator">*</span> <span class="token keyword">as</span> React <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> Map <span class="token keyword">from</span> <span class="token string">'react-map-gl'</span><span class="token punctuation">;</span>
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<span class="token keyword">function</span> <span class="token function">App</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token operator"><</span>Map
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initialViewState<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>
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<span class="token literal-property property">longitude</span><span class="token operator">:</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span>
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<span class="token literal-property property">latitude</span><span class="token operator">:</span> <span class="token number">40</span><span class="token punctuation">,</span>
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<span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token number">3.5</span>
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<span class="token punctuation">}</span><span class="token punctuation">}</span>
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mapStyle<span class="token operator">=</span><span class="token string">"mapbox://styles/mapbox/streets-v9"</span>
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<span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></code></pre></div><h2 style="position:relative" id="controlled-map" class="typography__H2-sc-1pmaksm-3 jYCwIr"><a href="#controlled-map" aria-label="controlled map permalink" class="typography__A-sc-1pmaksm-0 dvhuEd anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Controlled Map</h2><p class="typography__P-sc-1pmaksm-8 cncNYa">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" class="typography__A-sc-1pmaksm-0 dvhuEd">here</a>.</p><div class="gatsby-highlight" data-language="js"><pre class="typography__Pre-sc-1pmaksm-14 fPGooQ language-js"><code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-js"><span class="token keyword">import</span> <span class="token operator">*</span> <span class="token keyword">as</span> React <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> Map <span class="token keyword">from</span> <span class="token string">'react-map-gl'</span><span class="token punctuation">;</span>
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<span class="token keyword">function</span> <span class="token function">App</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> <span class="token punctuation">[</span>viewState<span class="token punctuation">,</span> setViewState<span class="token punctuation">]</span> <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">useState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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<span class="token literal-property property">longitude</span><span class="token operator">:</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span>
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<span class="token literal-property property">latitude</span><span class="token operator">:</span> <span class="token number">40</span><span class="token punctuation">,</span>
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<span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token number">3.5</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token operator"><</span>Map
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<span class="token punctuation">{</span><span class="token operator">...</span>viewState<span class="token punctuation">}</span>
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onMove<span class="token operator">=</span><span class="token punctuation">{</span><span class="token parameter">evt</span> <span class="token operator">=></span> <span class="token function">setViewState</span><span class="token punctuation">(</span>evt<span class="token punctuation">.</span>viewState<span class="token punctuation">)</span><span class="token punctuation">}</span>
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mapStyle<span class="token operator">=</span><span class="token string">"mapbox://styles/mapbox/streets-v9"</span>
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<span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></code></pre></div><p class="typography__P-sc-1pmaksm-8 cncNYa">A real-world application likely uses more complicated state flows:</p><ul class="typography__List-sc-1pmaksm-9 hsOfQe"><li class="typography__ListItem-sc-1pmaksm-10 kVRSNy">Using map with a state store (Redux) <a href="https://github.com/visgl/react-map-gl/tree/7.0-release/examples/get-started/redux" class="typography__A-sc-1pmaksm-0 dvhuEd">example</a></li><li class="typography__ListItem-sc-1pmaksm-10 kVRSNy">Using map with SSR (Next.js) <a href="https://github.com/visgl/react-map-gl/tree/7.0-release/examples/get-started/nextjs" class="typography__A-sc-1pmaksm-0 dvhuEd">example</a></li></ul><h2 style="position:relative" id="custom-camera-constraints" class="typography__H2-sc-1pmaksm-3 jYCwIr"><a href="#custom-camera-constraints" aria-label="custom camera constraints permalink" class="typography__A-sc-1pmaksm-0 dvhuEd anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Custom Camera Constraints</h2><p class="typography__P-sc-1pmaksm-8 cncNYa"><code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-text">Map</code> offers props that set basic constraints for the camera, e.g. <code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-text">maxBounds</code>, <code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-text">minZoom</code>, <code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-text">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="gatsby-highlight" data-language="js"><pre class="typography__Pre-sc-1pmaksm-14 fPGooQ language-js"><code class="typography__InlineCode-sc-1pmaksm-12 egvBsN language-js"><span class="token keyword">import</span> <span class="token operator">*</span> <span class="token keyword">as</span> React <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> Map <span class="token keyword">from</span> <span class="token string">'react-map-gl'</span><span class="token punctuation">;</span>
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<span class="token comment">// npm install @turf/turf</span>
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<span class="token keyword">import</span> <span class="token operator">*</span> <span class="token keyword">as</span> turf <span class="token keyword">from</span> <span class="token string">'@turf/turf'</span><span class="token punctuation">;</span>
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<span class="token comment">// A circle of 5 mile radius of the Empire State Building</span>
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<span class="token keyword">const</span> <span class="token constant">GEOFENCE</span> <span class="token operator">=</span> turf<span class="token punctuation">.</span><span class="token function">circle</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token operator">-</span><span class="token number">74.0122106</span><span class="token punctuation">,</span> <span class="token number">40.7467898</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">units</span><span class="token operator">:</span> <span class="token string">'miles'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">function</span> <span class="token function">App</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> <span class="token punctuation">[</span>viewState<span class="token punctuation">,</span> setViewState<span class="token punctuation">]</span> <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">useState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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<span class="token literal-property property">longitude</span><span class="token operator">:</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span>
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<span class="token literal-property property">latitude</span><span class="token operator">:</span> <span class="token number">40</span><span class="token punctuation">,</span>
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<span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token number">3.5</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> onMove <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">useCallback</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span>viewState<span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> newCenter <span class="token operator">=</span> <span class="token punctuation">[</span>viewState<span class="token punctuation">.</span>longitude<span class="token punctuation">,</span> viewState<span class="token punctuation">.</span>latitude<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token comment">// Only update the view state if the center is inside the geofence</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>turf<span class="token punctuation">.</span><span class="token function">booleanPointInPolygon</span><span class="token punctuation">(</span>newCenter<span class="token punctuation">,</span> <span class="token constant">GEOFENCE</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">setViewState</span><span class="token punctuation">(</span>newCenter<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<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>
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<span class="token keyword">return</span> <span class="token operator"><</span>Map
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<span class="token punctuation">{</span><span class="token operator">...</span>viewState<span class="token punctuation">}</span>
|
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onMove<span class="token operator">=</span><span class="token punctuation">{</span>onMove<span class="token punctuation">}</span>
|
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mapStyle<span class="token operator">=</span><span class="token string">"mapbox://styles/mapbox/streets-v9"</span>
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<span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span></code></pre></div></div></div></div></div></div></div><div id="gatsby-announcer" style="position:absolute;top:0;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0, 0, 0, 0);white-space:nowrap;border:0" aria-live="assertive" aria-atomic="true"></div></div><script id="gatsby-script-loader">/*<![CDATA[*/window.pagePath="/docs/get-started/state-management";/*]]>*/</script><script id="gatsby-chunk-mapping">/*<![CDATA[*/window.___chunkMapping={"polyfill":["/polyfill-4b657be50967bad20dc3.js"],"app":["/app-c33704d3a1abd6ea3046.js"],"component---examples-clusters-src-app-tsx":["/component---examples-clusters-src-app-tsx-ae435c98aa31b91df409.js"],"component---examples-controls-src-app-tsx":["/component---examples-controls-src-app-tsx-0fc6f5753e0415fde950.js"],"component---examples-custom-cursor-src-app-tsx":["/component---examples-custom-cursor-src-app-tsx-bd123514f109e45b15c9.js"],"component---examples-draggable-markers-src-app-tsx":["/component---examples-draggable-markers-src-app-tsx-c08cc0293d6f625308f7.js"],"component---examples-draw-polygon-src-app-tsx":["/component---examples-draw-polygon-src-app-tsx-4287be5a2ea35fbe0113.js"],"component---examples-filter-src-app-tsx":["/component---examples-filter-src-app-tsx-28b144519a629b0e0c53.js"],"component---examples-geocoder-src-app-tsx":["/component---examples-geocoder-src-app-tsx-244936683de9dee32672.js"],"component---examples-geojson-animation-src-app-tsx":["/component---examples-geojson-animation-src-app-tsx-8eaab89aa0e2583bf5b2.js"],"component---examples-geojson-src-app-tsx":["/component---examples-geojson-src-app-tsx-96c6855ca732a70078ab.js"],"component---examples-heatmap-src-app-tsx":["/component---examples-heatmap-src-app-tsx-c7a35aaf435bc075107c.js"],"component---examples-interaction-src-app-tsx":["/component---examples-interaction-src-app-tsx-cbc73f781b670001e1cb.js"],"component---examples-layers-src-app-tsx":["/component---examples-layers-src-app-tsx-cf13aa48a159342af3e3.js"],"component---examples-side-by-side-src-app-tsx":["/component---examples-side-by-side-src-app-tsx-c948e78a1a5129b01a93.js"],"component---examples-terrain-src-app-tsx":["/component---examples-terrain-src-app-tsx-7b12f3bb393a8bb524f0.js"],"component---examples-viewport-animation-src-app-tsx":["/component---examples-viewport-animation-src-app-tsx-8c2f70b3ab14cbdc2a58.js"],"component---examples-zoom-to-bounds-src-app-tsx":["/component---examples-zoom-to-bounds-src-app-tsx-2d6b6e19aa1d94266910.js"],"component---node-modules-gatsby-theme-ocular-src-react-templates-documentation-jsx":["/component---node-modules-gatsby-theme-ocular-src-react-templates-documentation-jsx-298d6a55a92e5d120c0e.js"],"component---node-modules-gatsby-theme-ocular-src-react-templates-examples-jsx":["/component---node-modules-gatsby-theme-ocular-src-react-templates-examples-jsx-861d77d9a70335a1bb15.js"],"component---node-modules-gatsby-theme-ocular-src-react-templates-search-jsx":["/component---node-modules-gatsby-theme-ocular-src-react-templates-search-jsx-b867458182f2a5e115e0.js"],"component---src-home-js":["/component---src-home-js-d077024a439c8e9d840e.js"]};/*]]>*/</script><script src="/react-map-gl/polyfill-4b657be50967bad20dc3.js" nomodule=""></script><script src="/react-map-gl/component---node-modules-gatsby-theme-ocular-src-react-templates-documentation-jsx-298d6a55a92e5d120c0e.js" async=""></script><script src="/react-map-gl/app-c33704d3a1abd6ea3046.js" async=""></script><script src="/react-map-gl/framework-47a7447cd78cae046a8b.js" async=""></script><script src="/react-map-gl/webpack-runtime-53e1d5786ef6c6593773.js" async=""></script></body></html> |