## Visualize animated paths

This example shows vehicle trip data in New York City. The
[`Trips Layer`](https://deck.gl/docs/api-reference/geo-layers/trips-layer)
renders animated paths that represent vehicle trips.
<iframe src="https://maps-docs-team.web.app/samples/deckgl-tripslayer/dist/" allow="fullscreen; "></iframe>

### TypeScript

```typescript
import { GoogleMapsOverlay } from '@deck.gl/google-maps';
import { TripsLayer } from '@deck.gl/geo-layers';
import { Color } from '@deck.gl/core';

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

const ASSET_BASE_URL = new URL('https://maps-docs-team.web.app/samples/deckgl-tripslayer/dist/');

// Set the path to the GeoJSON data file.
const DATA_URL = new URL('./trips-v7.json', ASSET_BASE_URL).toString();

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

async function init() {
    // Request needed libraries.
    await google.maps.importLibrary('maps');

    // Get the gmp-map element.
    const mapElement = document.querySelector('gmp-map')!;

    // Get the inner map.
    const innerMap = mapElement.innerMap;

    innerMap.setTilt(45);

    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 googleMapsOverlayProps = {};
    const overlay = new GoogleMapsOverlay(googleMapsOverlayProps);

    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(innerMap);
}

void init();
```

### JavaScript

```javascript
import { GoogleMapsOverlay } from '@deck.gl/google-maps';
import { TripsLayer } from '@deck.gl/geo-layers';

const ASSET_BASE_URL = new URL('https://maps-docs-team.web.app/samples/deckgl-tripslayer/dist/');

// Set the path to the GeoJSON data file.
const DATA_URL = new URL('./trips-v7.json', ASSET_BASE_URL).toString();

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

async function init() {
    // Request needed libraries.
    await google.maps.importLibrary('maps');

    // Get the gmp-map element.
    const mapElement = document.querySelector('gmp-map');

    // Get the inner map.
    const innerMap = mapElement.innerMap;

    innerMap.setTilt(45);

    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 googleMapsOverlayProps = {};
    const overlay = new GoogleMapsOverlay(googleMapsOverlayProps);

    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(innerMap);
}

void init();
```

### CSS

```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
<html>
    <head>
        <title>deck.gl Trips Layer</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: "GOOGLE_MAPS_API_KEY"
            });
        </script>
    </head>
    <body>
        <gmp-map
            map-id="fae05836df2dc8bb"
            center="40.72,-74.00"
            zoom="15"></gmp-map>
    </body>
</html>
```

### Clone Sample


Git and Node.js are required to run this sample locally. Follow these [instructions](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)
to install Node.js and NPM. You will also need a [Google Maps API key](https://developers.google.com/maps/documentation/javascript/get-api-key.md.txt).


The following commands clone the repository, install dependencies, and copy the environment file.

```javascript
  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd js-api-samples
  npm i
  cp .env.template .env
```


Once you copy the environment file, make sure to open the `.env` file and replace `<Insert your own development API key here>` with your actual API key before starting the sample.

```javascript
  cd samples/deckgl-tripslayer
  npm start
```