This example draws a red circle when the clicked point falls outside of the specified polygon (the Bermuda Triangle), and a blue triangle when the click falls inside the polygon.
Read the documentation.
TypeScript
// This example requires the Geometry library. Include the libraries=geometry // parameter when you first load the API. For example: // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry"> function initMap(): void { const map = new google.maps.Map( document.getElementById("map") as HTMLElement, { center: { lat: 24.886, lng: -70.269 }, zoom: 5, } ); const triangleCoords = [ { lat: 25.774, lng: -80.19 }, { lat: 18.466, lng: -66.118 }, { lat: 32.321, lng: -64.757 }, ]; const bermudaTriangle = new google.maps.Polygon({ paths: triangleCoords }); google.maps.event.addListener(map, "click", (e) => { const resultColor = google.maps.geometry.poly.containsLocation( e.latLng, bermudaTriangle ) ? "blue" : "red"; const resultPath = google.maps.geometry.poly.containsLocation( e.latLng, bermudaTriangle ) ? // A triangle. "m 0 -1 l 1 2 -2 0 z" : google.maps.SymbolPath.CIRCLE; new google.maps.Marker({ position: e.latLng, map, icon: { path: resultPath, fillColor: resultColor, fillOpacity: 0.2, strokeColor: "white", strokeWeight: 0.5, scale: 10, }, }); }); }
JavaScript
// This example requires the Geometry library. Include the libraries=geometry // parameter when you first load the API. For example: // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry"> function initMap() { const map = new google.maps.Map(document.getElementById("map"), { center: { lat: 24.886, lng: -70.269 }, zoom: 5, }); const triangleCoords = [ { lat: 25.774, lng: -80.19 }, { lat: 18.466, lng: -66.118 }, { lat: 32.321, lng: -64.757 }, ]; const bermudaTriangle = new google.maps.Polygon({ paths: triangleCoords }); google.maps.event.addListener(map, "click", (e) => { const resultColor = google.maps.geometry.poly.containsLocation( e.latLng, bermudaTriangle ) ? "blue" : "red"; const resultPath = google.maps.geometry.poly.containsLocation( e.latLng, bermudaTriangle ) ? // A triangle. "m 0 -1 l 1 2 -2 0 z" : google.maps.SymbolPath.CIRCLE; new google.maps.Marker({ position: e.latLng, map, icon: { path: resultPath, fillColor: resultColor, fillOpacity: 0.2, strokeColor: "white", strokeWeight: 0.5, scale: 10, }, }); }); }
CSS
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
HTML
<!DOCTYPE html> <html> <head> <title>Polygon Contains Location</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=geometry&v=weekly" defer ></script> <link rel="stylesheet" type="text/css" href="./style.css" /> <script src="./index.js"></script> </head> <body> <div id="map"></div> </body> </html>
All
<!DOCTYPE html> <html> <head> <title>Polygon Contains Location</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=geometry&v=weekly" defer ></script> <style type="text/css"> /* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; } </style> <script> // This example requires the Geometry library. Include the libraries=geometry // parameter when you first load the API. For example: // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry"> function initMap() { const map = new google.maps.Map(document.getElementById("map"), { center: { lat: 24.886, lng: -70.269 }, zoom: 5, }); const triangleCoords = [ { lat: 25.774, lng: -80.19 }, { lat: 18.466, lng: -66.118 }, { lat: 32.321, lng: -64.757 }, ]; const bermudaTriangle = new google.maps.Polygon({ paths: triangleCoords, }); google.maps.event.addListener(map, "click", (e) => { const resultColor = google.maps.geometry.poly.containsLocation( e.latLng, bermudaTriangle ) ? "blue" : "red"; const resultPath = google.maps.geometry.poly.containsLocation( e.latLng, bermudaTriangle ) ? // A triangle. "m 0 -1 l 1 2 -2 0 z" : google.maps.SymbolPath.CIRCLE; new google.maps.Marker({ position: e.latLng, map, icon: { path: resultPath, fillColor: resultColor, fillOpacity: 0.2, strokeColor: "white", strokeWeight: 0.5, scale: 10, }, }); }); } </script> </head> <body> <div id="map"></div> </body> </html>
Create a starter application from sample
A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.
Run Locally
Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.
npx @googlemaps/js-samples init poly-containsLocation DESTINATION_FOLDER
Run in Google Cloud Shell
Google Cloud Shell is an interactive shell environment for Google Cloud Platform that makes it easy for you to learn and experiment with GCP and manage your projects and resources from your web browser.
Run in Cloud Shell