Simple Polylines

  • 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.Polyline to 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 the first trans-Pacific flight between Oakland, CA, and Brisbane, Australia.

Read the documentation.

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.
const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
let innerMap;

async function initMap() {
    (await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
    innerMap = mapElement.innerMap;

    const flightPlanCoordinates = [
        { lat: 37.772, lng: -122.214 },
        { lat: 21.291, lng: -157.821 },
        { lat: -18.142, lng: 178.431 },
        { lat: -27.467, lng: 153.027 },
    ];
    const flightPath = new google.maps.Polyline({
        path: flightPlanCoordinates,
        geodesic: true,
        strokeColor: '#FF0000',
        strokeOpacity: 1.0,
        strokeWeight: 2,
    });

    flightPath.setMap(innerMap);
}

initMap();
index.ts

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.
const mapElement = document.querySelector('gmp-map');
let innerMap;
async function initMap() {
    (await google.maps.importLibrary('maps'));
    innerMap = mapElement.innerMap;
    const flightPlanCoordinates = [
        { lat: 37.772, lng: -122.214 },
        { lat: 21.291, lng: -157.821 },
        { lat: -18.142, lng: 178.431 },
        { lat: -27.467, lng: 153.027 },
    ];
    const flightPath = new google.maps.Polyline({
        path: flightPlanCoordinates,
        geodesic: true,
        strokeColor: '#FF0000',
        strokeOpacity: 1.0,
        strokeWeight: 2,
    });
    flightPath.setMap(innerMap);
}
initMap();
index.js

CSS

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
}

style.css

HTML

<html>
    <head>
        <title>Simple Polylines</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
        <!-- prettier-ignore -->
        <script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})
        ({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script>
    </head>
    <body>
        <gmp-map center="0, -180" zoom="3" map-type-id="terrain"> </gmp-map>
    </body>
</html>
index.html

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. 

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd samples/polyline-simple
  npm i
  npm start