Visualizing points with arcs
This example uses arcs to show curved point-to-point connections between
airports and the city of Prague. The ArcLayer
renders raised arcs joining pairs of source and target points.
TypeScript
// TODO Use imports when Deck.gl works in more bundlers // https://github.com/visgl/deck.gl/issues/6351#issuecomment-1079424167 import type * as GeoJSON from "geojson"; // import { ArcLayer} from "deck.gl"; // import { GoogleMapsOverlay } from "@deck.gl/google-maps"; const ArcLayer = deck.ArcLayer; const GoogleMapsOverlay = deck.GoogleMapsOverlay; type Properties = { scalerank: number }; type Feature = GeoJSON.Feature<GeoJSON.Point, Properties>; type Data = GeoJSON.FeatureCollection<GeoJSON.Point, Properties>; const AIRPORTS = "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_10m_airports.geojson"; function initMap(): void { const map = new google.maps.Map( document.getElementById("map") as HTMLElement, { center: { lat: 50, lng: 14 }, tilt: 30, mapId: "90f87356969d889c", zoom: 3, } ); const flightsLayer = new ArcLayer({ id: "flights", data: AIRPORTS, dataTransform: (d: Data) => d.features.filter((f) => f.properties.scalerank < 4), getSourcePosition: () => [14.42076, 50.08804], // Prague getTargetPosition: (f: Feature) => f.geometry.coordinates, getSourceColor: [0, 128, 200], getTargetColor: [0, 0, 80], getWidth: 1, }); const overlay = new GoogleMapsOverlay({ layers: [flightsLayer], }); overlay.setMap(map); } declare global { interface Window { initMap: () => void; } } window.initMap = initMap;
JavaScript
// import { ArcLayer} from "deck.gl"; // import { GoogleMapsOverlay } from "@deck.gl/google-maps"; const ArcLayer = deck.ArcLayer; const GoogleMapsOverlay = deck.GoogleMapsOverlay; const AIRPORTS = "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_10m_airports.geojson"; function initMap() { const map = new google.maps.Map(document.getElementById("map"), { center: { lat: 50, lng: 14 }, tilt: 30, mapId: "90f87356969d889c", zoom: 3, }); const flightsLayer = new ArcLayer({ id: "flights", data: AIRPORTS, dataTransform: (d) => d.features.filter((f) => f.properties.scalerank < 4), getSourcePosition: () => [14.42076, 50.08804], // Prague getTargetPosition: (f) => f.geometry.coordinates, getSourceColor: [0, 128, 200], getTargetColor: [0, 0, 80], getWidth: 1, }); const overlay = new GoogleMapsOverlay({ layers: [flightsLayer], }); 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 ArcLayer</title> <script src="https://unpkg.com/deck.gl@8.9.22/dist.min.js"></script> <script src="https://unpkg.com/@deck.gl/google-maps@8.9.22/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 script 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. See https://developers.google.com/maps/documentation/javascript/load-maps-js-api for more information. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly" 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-arclayer 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