Complex Polylines

Click two or more points on the map to draw polylines.

Read the documentation.

TypeScript

/**
 * This example creates an interactive map which constructs a polyline based on
 * user clicks. Note that the polyline only appears once its path property
 * contains two LatLng coordinates.
 */

let poly: google.maps.Polyline;
const mapElement = document.querySelector('gmp-map')!;
let innerMap: google.maps.Map;

async function initMap() {
    // Import the needed libraries.
    const [{ Polyline }, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('marker'),
    ]);

    innerMap = mapElement.innerMap;

    poly = new Polyline({
        strokeColor: '#000000',
        strokeOpacity: 1.0,
        strokeWeight: 3,
    });
    poly.setMap(innerMap);

    // Handles click events on a map, and adds a new point to the Polyline.
    innerMap.addListener('click', (event: google.maps.MapMouseEvent) => {
        const latLng = event.latLng;
        if (!latLng) return;

        const path = poly.getPath();

        // Because path is an MVCArray, we can simply append a new coordinate
        // and it will automatically appear.
        path.push(latLng);

        // Add a new marker at the new plotted point on the polyline.
        new AdvancedMarkerElement({
            position: latLng,
            title: '#' + path.getLength(),
            map: innerMap,
        });
    });
}

void initMap();

JavaScript

/**
 * This example creates an interactive map which constructs a polyline based on
 * user clicks. Note that the polyline only appears once its path property
 * contains two LatLng coordinates.
 */

let poly;
const mapElement = document.querySelector('gmp-map');
let innerMap;

async function initMap() {
    // Import the needed libraries.
    const [{ Polyline }, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('marker'),
    ]);

    innerMap = mapElement.innerMap;

    poly = new Polyline({
        strokeColor: '#000000',
        strokeOpacity: 1.0,
        strokeWeight: 3,
    });
    poly.setMap(innerMap);

    // Handles click events on a map, and adds a new point to the Polyline.
    innerMap.addListener('click', (event) => {
        const latLng = event.latLng;
        if (!latLng) return;

        const path = poly.getPath();

        // Because path is an MVCArray, we can simply append a new coordinate
        // and it will automatically appear.
        path.push(latLng);

        // Add a new marker at the new plotted point on the polyline.
        new AdvancedMarkerElement({
            position: latLng,
            title: '#' + path.getLength(),
            map: innerMap,
        });
    });
}

void initMap();

CSS

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

HTML

<html>
    <head>
        <title>Complex Polylines</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
        <script>
            // prettier-ignore
            (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"
            });
        </script>
    </head>
    <body>
        <gmp-map
            center="41.879, -87.624"
            zoom="7"
            map-id="DEMO_MAP_ID"></gmp-map>
    </body>
</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-complex
  npm i
  npm start