export default function App()

in examples/website/trips/app.js [58:135]
72 lines of code
2 McCabe index (conditional complexity)

export default function App({
  buildings = DATA_URL.BUILDINGS,
  trips = DATA_URL.TRIPS,
  trailLength = 180,
  initialViewState = INITIAL_VIEW_STATE,
  mapStyle = 'mapbox://styles/mapbox/dark-v9',
  theme = DEFAULT_THEME,
  loopLength = 1800, // unit corresponds to the timestamp in source data
  animationSpeed = 1
}) {
  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 PolygonLayer({
      id: 'ground',
      data: landCover,
      getPolygon: f => f,
      stroked: false,
      getFillColor: [0, 0, 0, 0]
    }),
    new TripsLayer({
      id: 'trips',
      data: trips,
      getPath: d => d.path,
      getTimestamps: d => d.timestamps,
      getColor: d => (d.vendor === 0 ? theme.trailColor0 : theme.trailColor1),
      opacity: 0.3,
      widthMinPixels: 2,
      rounded: true,
      trailLength,
      currentTime: time,

      shadowEnabled: false
    }),
    new PolygonLayer({
      id: 'buildings',
      data: buildings,
      extruded: true,
      wireframe: false,
      opacity: 0.5,
      getPolygon: f => f.polygon,
      getElevation: f => f.height,
      getFillColor: theme.buildingColor,
      material: theme.material
    })
  ];

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