Google Maps and deck.gl Trips Layer

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Visualizing animated paths

This example shows vehicle trip data in New York City. The Trips Layer renders animated paths that represent vehicle trips.

TypeScript

// TODO Use imports when Deck.gl works in more bundlers
// https://github.com/visgl/deck.gl/issues/6351#issuecomment-1079424167

// import { GoogleMapsOverlay } from "@deck.gl/google-maps";
// import { TripsLayer } from "deck.gl";

const GoogleMapsOverlay = deck.GoogleMapsOverlay;
const TripsLayer = deck.TripsLayer;

interface Data {
  vendor: number;
  path: [number, number][];
  timestamps: number[];
}

const DATA_URL =
  "https://raw.githubusercontent.com/visgl/deck.gl-data/master/examples/trips/trips-v7.json";

const LOOP_LENGTH = 1800;
const VENDOR_COLORS = [
  [255, 0, 0], // vendor #0
  [0, 0, 255], // vendor #1
];

function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      center: { lat: 40.72, lng: -74 },
      mapId: "fae05836df2dc8bb",
      tilt: 45,
      zoom: 15,
    }
  );

  let currentTime = 0;
  const props = {
    id: "trips",
    data: DATA_URL,
    getPath: (d: Data) => d.path,
    getTimestamps: (d: Data) => d.timestamps,
    getColor: (d: Data) => VENDOR_COLORS[d.vendor],
    opacity: 1,
    widthMinPixels: 2,
    trailLength: 180,
    currentTime,
    shadowEnabled: false,
  };

  const overlay = new GoogleMapsOverlay({});

  const animate = () => {
    currentTime = (currentTime + 1) % LOOP_LENGTH;

    const tripsLayer = new TripsLayer({
      ...props,
      currentTime,
    });

    overlay.setProps({
      layers: [tripsLayer],
    });

    window.requestAnimationFrame(animate);
  };

  window.requestAnimationFrame(animate);

  overlay.setMap(map);
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;

JavaScript

// TODO Use imports when Deck.gl works in more bundlers
// https://github.com/visgl/deck.gl/issues/6351#issuecomment-1079424167
// import { GoogleMapsOverlay } from "@deck.gl/google-maps";
// import { TripsLayer } from "deck.gl";
const GoogleMapsOverlay = deck.GoogleMapsOverlay;
const TripsLayer = deck.TripsLayer;
const DATA_URL =
  "https://raw.githubusercontent.com/visgl/deck.gl-data/master/examples/trips/trips-v7.json";
const LOOP_LENGTH = 1800;
const VENDOR_COLORS = [
  [255, 0, 0],
  [0, 0, 255], // vendor #1
];

function initMap() {
  const map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 40.72, lng: -74 },
    mapId: "fae05836df2dc8bb",
    tilt: 45,
    zoom: 15,
  });
  let currentTime = 0;
  const props = {
    id: "trips",
    data: DATA_URL,
    getPath: (d) => d.path,
    getTimestamps: (d) => d.timestamps,
    getColor: (d) => VENDOR_COLORS[d.vendor],
    opacity: 1,
    widthMinPixels: 2,
    trailLength: 180,
    currentTime,
    shadowEnabled: false,
  };
  const overlay = new GoogleMapsOverlay({});

  const animate = () => {
    currentTime = (currentTime + 1) % LOOP_LENGTH;

    const tripsLayer = new TripsLayer({
      ...props,
      currentTime,
    });

    overlay.setProps({
      layers: [tripsLayer],
    });
    window.requestAnimationFrame(animate);
  };

  window.requestAnimationFrame(animate);
  overlay.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>deck.gl Trips Layer</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://unpkg.com/deck.gl@8.7.3/dist.min.js"></script>
    <script src="https://unpkg.com/@deck.gl/google-maps@8.7.3/dist.min.js"></script>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- 
      The `defer` attribute causes the callback 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
      with https://www.npmjs.com/package/@googlemaps/js-api-loader.
      -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=beta"
      defer
    ></script>
  </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 -b sample-deckgl-tripslayer https://github.com/googlemaps/js-samples.git
  cd js-samples
  npm i
  npm start

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME.

  git checkout sample-SAMPLE_NAME
  npm i
  npm start