Simple Polylines
Page Summary
This example demonstrates how to create a simple polyline on a map using the Google Maps JavaScript API.
The polyline is visualized as a 2-pixel-wide red line, representing the path of a historical trans-Pacific flight.
The code utilizes
google.maps.Polylineto define the polyline's properties such as path, color, and width.Provided code snippets include TypeScript, JavaScript, CSS, and HTML for a comprehensive implementation.
This example creates a two-pixel-wide red polyline that shows the path of thefirst trans-Pacific flight between Oakland, CA, and Brisbane, Australia.
Read thedocumentation.
TypeScript
// This example creates a 2-pixel-wide red polyline showing the path of// the first trans-Pacific flight between Oakland, CA, and Brisbane,// Australia which was made by Charles Kingsford Smith.functioninitMap():void{constmap=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:3,center:{lat:0,lng:-180},mapTypeId:"terrain",});constflightPlanCoordinates=[{lat:37.772,lng:-122.214},{lat:21.291,lng:-157.821},{lat:-18.142,lng:178.431},{lat:-27.467,lng:153.027},];constflightPath=newgoogle.maps.Polyline({path:flightPlanCoordinates,geodesic:true,strokeColor:"#FF0000",strokeOpacity:1.0,strokeWeight:2,});flightPath.setMap(map);}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
JavaScript
// This example creates a 2-pixel-wide red polyline showing the path of// the first trans-Pacific flight between Oakland, CA, and Brisbane,// Australia which was made by Charles Kingsford Smith.functioninitMap(){constmap=newgoogle.maps.Map(document.getElementById("map"),{zoom:3,center:{lat:0,lng:-180},mapTypeId:"terrain",});constflightPlanCoordinates=[{lat:37.772,lng:-122.214},{lat:21.291,lng:-157.821},{lat:-18.142,lng:178.431},{lat:-27.467,lng:153.027},];constflightPath=newgoogle.maps.Polyline({path:flightPlanCoordinates,geodesic:true,strokeColor:"#FF0000",strokeOpacity:1.0,strokeWeight:2,});flightPath.setMap(map);}window.initMap=initMap;
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
<html> <head> <title>Simple Polylines</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> </head> <body> <div></div> <!-- The `defer` attribute causes the script to execute after the full HTML document has been parsed. For non-blocking uses, avoiding race conditions, and consistent behavior across browsers, consider loading using Promises. See https://developers.google.com/maps/documentation/javascript/load-maps-js-api for more information. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly" defer ></script> </body></html>
Try Sample
Clone Sample
Git and Node.js are required to run this sample locally. Follow theseinstructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.
gitclone-bsample-polyline-simplehttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart
Other samples can be tried by switching to any branch beginning withsample-SAMPLE_NAME.
gitcheckoutsample-SAMPLE_NAMEnpminpmstart
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Last updated 2025-12-18 UTC.