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feat: Migrates the polyline-complex sample. (#1110)
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‎samples/polyline-complex/README.md‎

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# Google Maps JavaScript Sample
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## polyline-complex
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THhis example demonstrates constructing a polyline based on clicks (click the map to add a vertex).
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## Setup
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### Before starting run:
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`npm i`
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### Run an example on a local web server
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`cd samples/polyline-complex`
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`npm start`
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### Build an individual example
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`cd samples/polyline-complex`
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`npm run build`
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From 'samples':
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`npm run build --workspace=polyline-complex/`
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### Build all of the examples.
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From 'samples':
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`npm run build-all`
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### Run lint to check for problems
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`cd samples/polyline-complex`
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`npx eslint index.ts`
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## Feedback
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For feedback related to this sample, please open a new issue on
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[GitHub](https://github.com/googlemaps-samples/js-api-samples/issues).

‎samples/polyline-complex/index.html‎

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<!doctype html>
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<!--
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@license
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Copyright 2026 Google LLC. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0
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-->
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<!-- [START maps_polyline_complex] -->
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<html>
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<head>
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<title>Complex Polylines</title>
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<link rel="stylesheet" type="text/css" href="./style.css" />
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<script type="module" src="./index.js"></script>
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<!-- prettier-ignore -->
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<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))})
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({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script>
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</head>
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<body>
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<gmp-map
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center="41.879, -87.624"
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zoom="7"
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map-id="DEMO_MAP_ID"
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></gmp-map>
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</body>
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</html>
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<!-- [END maps_polyline_complex] -->

‎samples/polyline-complex/index.ts‎

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/**
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* @license
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* Copyright 2026 Google LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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// [START maps_polyline_complex]
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/**
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* This example creates an interactive map which constructs a polyline based on
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* user clicks. Note that the polyline only appears once its path property
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* contains two LatLng coordinates.
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*/
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let poly: google.maps.Polyline;
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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let innerMap;
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async function initMap() {
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// Import the needed libraries.
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(await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
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(await google.maps.importLibrary('marker')) as google.maps.MarkerLibrary;
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innerMap = mapElement.innerMap;
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poly = new google.maps.Polyline({
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strokeColor: "#000000",
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strokeOpacity: 1.0,
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strokeWeight: 3,
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});
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poly.setMap(innerMap);
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// Add a listener for the click event
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innerMap.addListener("click", addLatLng);
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}
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// Handles click events on a map, and adds a new point to the Polyline.
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function addLatLng(event: google.maps.MapMouseEvent) {
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const path = poly.getPath();
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// Because path is an MVCArray, we can simply append a new coordinate
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// and it will automatically appear.
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path.push(event.latLng as google.maps.LatLng);
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// Add a new marker at the new plotted point on the polyline.
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new google.maps.marker.AdvancedMarkerElement({
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position: event.latLng,
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title: "#" + path.getLength(),
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map: innerMap,
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});
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}
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initMap();
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// [END maps_polyline_complex]

‎samples/polyline-complex/package.json‎

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{
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"name": "@js-api-samples/polyline-complex",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh polyline-complex && bash ../app.sh polyline-complex && bash ../docs.sh polyline-complex && npm run build:vite --workspace=. && bash ../dist.sh polyline-complex",
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"test": "tsc && npm run build:vite --workspace=.",
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"start": "tsc && vite build --base './' && vite",
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"build:vite": "vite build --base './'",
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"preview": "vite preview"
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},
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"dependencies": {
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}
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}

‎samples/polyline-complex/style.css‎

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/**
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* @license
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* Copyright 2026 Google LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* [START maps_polyline_complex] */
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/*
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* Optional: Makes the sample page fill the window.
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*/
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html,
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body {
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height: 100%;
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margin: 0;
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padding: 0;
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}
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/* [END maps_polyline_complex] */

‎samples/polyline-complex/tsconfig.json‎

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{
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"compilerOptions": {
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"module": "esnext",
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"target": "esnext",
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"strict": true,
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"noImplicitAny": false,
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"lib": [
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"es2015",
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"esnext",
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"es6",
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"dom",
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"dom.iterable"
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],
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"moduleResolution": "Node",
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"jsx": "preserve"
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}
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}

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