app.js

/* global window */
import React, {useState, useEffect} from 'react';
import {render} from 'react-dom';
import {StaticMap} from 'react-map-gl';
import {AmbientLight, PointLight, LightingEffect} from '@deck.gl/core';
import DeckGL from '@deck.gl/react';
import {TripsLayer} from '@deck.gl/geo-layers';

// Source data CSV
const DATA_URL = {
  TRIPS: './bin/data_processed.json'
  };

const ambientLight = new AmbientLight({
  color: [255, 255, 255],
  intensity: 1.0
});

const pointLight = new PointLight({
  color: [255, 255, 255],
  intensity: 2.0,
  position: [-74.05, 40.7, 8000]
});

const lightingEffect = new LightingEffect({ambientLight, pointLight});

const DEFAULT_THEME = {
  effects: [lightingEffect]
};

const INITIAL_VIEW_STATE = {
  longitude: 114.027465,
  latitude: 22.632468,
  zoom: 10,
  pitch: 40,
  bearing: -10
};

const MAP_STYLE = 'https://basemaps.cartocdn.com/gl/dark-matter-nolabels-gl-style/style.json';

export default function App({
  trips = DATA_URL.TRIPS,
  trailLength = 150,
  initialViewState = INITIAL_VIEW_STATE,
  mapStyle = MAP_STYLE,
  theme = DEFAULT_THEME,
  loopLength = 3600*5, // unit corresponds to the timestamp in source data
  animationSpeed = 1.5
}) {
  const [time, setTime] = useState(0);
  const [animation] = useState({});

  const animate = () => {
    setTime(t => (t + animationSpeed) % loopLength);
    animation.id = window.requestAnimationFrame(animate);
  };

  useEffect(
    () => {
      animation.id = window.requestAnimationFrame(animate);
      return () => window.cancelAnimationFrame(animation.id);
    },
    [animation]
  );

  const layers = [
    // This is only needed when using shadow effects
    new TripsLayer({
      id: 'trips',
      data: trips,
      getPath: d => d.path,
      getTimestamps: d => d.timestamps,
      getColor: d => d.color,
      opacity: 0.8,
      widthMinPixels: 2,
      rounded: true,
      trailLength,
      currentTime: time+3600*6,

      shadowEnabled: false
    })
  ];

  return (
    <DeckGL
      layers={layers}
      effects={theme.effects}
      initialViewState={initialViewState}
      controller={true}
    >
      <StaticMap reuseMaps mapStyle={mapStyle} preventStyleDiffing={true} />
    </DeckGL>
  );
}

export function renderToDOM(container) {
  render(<App />, container);
}