google-maps-overlay.md

GoogleMapsOverlay

This class implements the OverlayView/WebGLOverlayView (depending on map rendering type) interface and can be used as any other Google Maps overlay.

As detailed in the overview, the overlay supports both Vector and Raster Google map rendering. Depending on the Google Map configuration, the correct deck.gl overlay rendering method will be chosen at runtime.

Example

import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem';

import {Loader} from '@googlemaps/js-api-loader';
import {GoogleMapsOverlay} from '@deck.gl/google-maps';
import {ScatterplotLayer} from '@deck.gl/layers';

const loader = new Loader({apiKey: '<google_maps_api_key>'});
const googlemaps = await loader.importLibrary('maps');

const map = new googlemaps.Map(document.getElementById('map'), {
  center: {lat: 51.47, lng: 0.45},
  zoom: 11,
  mapId: '<google_map_id>'
});

const overlay = new GoogleMapsOverlay({
  layers: [
    new ScatterplotLayer({
      id: 'deckgl-circle',
      data: [
        {position: [0.45, 51.47]}
      ],
      getPosition: d => d.position,
      getFillColor: [255, 0, 0, 100],
      getRadius: 1000
    })
  ]
});

overlay.setMap(map);

import React, {useMemo, useEffect} from 'react';
import {APIProvider, Map, useMap} from '@vis.gl/react-google-maps';
import {DeckProps} from '@deck.gl/core';
import {ScatterplotLayer} from '@deck.gl/layers';
import {GoogleMapsOverlay} from '@deck.gl/google-maps';

function DeckGLOverlay(props: DeckProps) {
  const map = useMap();
  const overlay = useMemo(() => new GoogleMapsOverlay(props));

  useEffect(() => {
    overlay.setMap(map);
    return () => overlay.setMap(null);
  }, [map])

  overlay.setProps(props);
  return null;
}

function App() {
  const layers = [
    new ScatterplotLayer({
      id: 'deckgl-circle',
      data: [
        {position: [0.45, 51.47]}
      ],
      getPosition: d => d.position,
      getFillColor: [255, 0, 0, 100],
      getRadius: 1000
    })
  ];

  return <APIProvider apiKey="<google_maps_api_key>">
    <Map
      defaultCenter={{lat: 51.47, lng: 0.45}}
      defaultZoom={11}
      mapId="<google_maps_id>" >
      <DeckGLOverlay layers={layers} />
    </Map>
  </APIProvider>;
}

Constructor

import {GoogleMapsOverlay} from '@deck.gl/google-maps';
import type {GoogleMapsOverlayProps} from '@deck.gl/google-maps';

new GoogleMapsOverlay(props: GoogleMapsOverlayProps);

props are forwarded to a Deck instance. The following Deck props are supported:

• style
• layers
• effects
• parameters
• pickingRadius
• useDevicePixels
• onWebGLInitialized
• onBeforeRender
• onAfterRender
• onLoad

The constructor additionally accepts the following option:

• interleaved (boolean) - When set to false, a dedicated deck.gl canvas is layered on top of the base map. If set to true and the Google Map is configured for Vector rendering, deck.gl layers are inserted into the Google Maps layer stack, sharing the same WebGL2RenderingContext. Default is true.

Methods

setMap {#setmap}

overlay.setMap(map);

Add/remove the overlay from a map. An overlay can be temporarily hidden from a map by calling setMap(null). Removing an overlay does not destroy the WebGL2 context; use finalize() if the overlay should be permanently removed.

setProps {#setprops}

overlay.setProps(props);

Update (partial) props.

pickObject {#pickobject}

Equivalent of deck.pickObject.

pickObjects {#pickobjects}

Equivalent of deck.pickObjects.

pickMultipleObjects {#pickmultipleobjects}

Equivalent of deck.pickMultipleObjects.

finalize {#finalize}

Remove the overlay and release all underlying resources.

getCanvas

See Deck.getCanvas. When using interleaved: true, returns the base map's canvas.