antv-l7/examples/gallery/animate/demo/build_sweep.js

import { Scene, CityBuildingLayer, LineLayer, PolygonLayer } from '@antv/l7';
import { GaodeMap } from '@antv/l7-maps';

const scene = new Scene({
  id: 'map',
  map: new GaodeMap({
    style: 'dark',
    center: [ 120.145, 30.238915 ],
    pitch: 60,
    zoom: 13.2
  })
});
fetch(
  'https://gw.alipayobjects.com/os/rmsportal/ggFwDClGjjvpSMBIrcEx.json'
).then(async res => {
  const pointLayer = new CityBuildingLayer();
  pointLayer
    .source(await res.json())
    .size('floor', [ 0, 500 ])
    .color('rgba(242,246,250,1.0)')
    .animate({
      enable: true
    })
    .active({
      color: '#0ff',
      mix: 0.5
    })
    .style({
      opacity: 0.7,
      baseColor: 'rgb(16, 16, 16)',
      windowColor: 'rgb(30, 60, 89)',
      brightColor: 'rgb(255, 176, 38)',
      sweep: {
        enable: true,
        sweepRadius: 2,
        sweepColor: '#1990FF',
        sweepSpeed: 0.5,
        sweepCenter: [ 120.145319, 30.238915 ]
      }
    });
  scene.addLayer(pointLayer);
});

fetch(
  'https://gw.alipayobjects.com/os/bmw-prod/67130c6c-7f49-4680-915c-54e69730861d.json'
)
  .then(data => data.json())
  .then(
    ({
      lakeBorderData,
      lakeData,
      landData
    }) => {
      const lakeLayer = new PolygonLayer()
        .source(lakeData)
        .shape('fill')
        .color('#1E90FF')
        .style({
          opacity: 0.4,
          opacityLinear: {
            enable: true,
            dir: 'out' // in - out
          }
        });
      const landLayer = new PolygonLayer()
        .source(landData)
        .shape('fill')
        .color('#3CB371')
        .style({
          opacity: 0.4,
          opacityLinear: {
            enable: true,
            dir: 'in' // in - out
          }
        });

      const lakeBorderLayer = new PolygonLayer()
        .source(lakeBorderData)
        .shape('fill')
        .color('#ccc')
        .style({
          opacity: 0.5,
          opacityLinear: {
            enable: true,
            dir: 'in' // in - out
          }
        });

      scene.addLayer(lakeLayer);
      scene.addLayer(lakeBorderLayer);
      scene.addLayer(landLayer);
    }
  );

fetch(
  'https://gw.alipayobjects.com/os/basement_prod/40ef2173-df66-4154-a8c0-785e93a5f18e.json'
)
  .then(res => res.json())
  .then(data => {
    const layer = new LineLayer({
      zIndex: 0
    })
      .source(data)
      .size(1)
      .shape('line')
      .color('#1990FF')
      .animate({
        interval: 1, // 间隔
        duration: 2, // 持续时间，延时
        trailLength: 2 // 流线长度
      });
    scene.addLayer(layer);
  });