triplayers

2021-09-10 17:00:48 作者：互联网
triplayers 地图流动效果

效果图:

代码:

<html>
  <head>
    <script src="https://unpkg.com/deck.gl@^8.4.0/dist.min.js"></script>
    <script src="https://unpkg.com/@deck.gl/carto@^8.4.0/dist.min.js"></script>

    <script src="https://libs.cartocdn.com/mapbox-gl/v1.13.0/mapbox-gl.js"></script>
    <link href="https://libs.cartocdn.com/mapbox-gl/v1.13.0/mapbox-gl.css" rel="stylesheet" />
  </head>

  <body style="margin: 0; padding: 0">
    <div id="map" style="width: 100vw; height: 100vh"></div>
  </body>

  <script type="text/javascript">
    const LOOP_LENGTH = 1800 //持续时长
    const ANIMATION_SPEED = 0.4 //速度

    async function initialize() {
      deck.carto.setDefaultCredentials({
        username: 'public',
        apiKey: 'default_public'
      })

      // Fetch Data from CARTO
      const query = 'SELECT the_geom, vendor, timestamps FROM new_york_trips'
      const url = `https://public.carto.com/api/v2/sql?q=${query}&format=geojson`
      const geojsonData = await fetch(url).then(response => response.json())
      // TripsLayer needs data in the following format
      const layerData = geojsonData.features.map(f => ({
        vendor: f.properties.vendor,
        timestamps: f.properties.timestamps,
        path: f.geometry.coordinates[0]
      }))

      console.log(layerData)

      const deckgl = new deck.DeckGL({
        container: 'map',
        mapStyle: {
          version: 8,
          sources: {
            'raster-tiles': {
              type: 'raster',
              tiles: [
                'https://map.geoq.cn/arcgis/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}'
              ],
              tileSize: 256,
              attribution:
                'Map tiles by <a target="_top" rel="noopener" href="http://stamen.com">Stamen Design</a>, under <a target="_top" rel="noopener" href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a>. Data by <a target="_top" rel="noopener" href="http://openstreetmap.org">OpenStreetMap</a>, under <a target="_top" rel="noopener" href="http://creativecommons.org/licenses/by-sa/3.0">CC BY SA</a>'
            }
          },
          layers: [
            {
              id: 'simple-tiles',
              type: 'raster',
              source: 'raster-tiles',
              minzoom: 0,
              maxzoom: 22
            }
          ]
        },
        initialViewState: {
          longitude: -74,
          latitude: 40.73,
          zoom: 6,
          pitch: 45,
          bearing: 0
        },
        controller: true
      })

      let time = 0

      function animate() {
        time = (time + ANIMATION_SPEED) % LOOP_LENGTH
        // console.log(time.toFixed(0))
        window.requestAnimationFrame(animate)
      }

      setInterval(() => {
        deckgl.setProps({
          layers: [
            new deck.TripsLayer({
              id: 'trips-layer',
              data: layerData,
              getPath: d => d.path,
              getTimestamps: d => d.timestamps,
              getColor: d => (d.vendor === 0 ? [253, 128, 93] : [23, 184, 190]),
              opacity: 0.3,
              widthMinPixels: 2,
              rounded: true,
              trailLength: 180,
              currentTime: time,
              shadowEnabled: false
            })
          ]
        })
      }, 50)

      window.requestAnimationFrame(animate)
    }

    initialize()
  </script>
</html>
标签：raster,tiles,const,vendor,time,timestamps,triplayers
来源： https://www.cnblogs.com/dxy9527/p/15252019.html