热力图-多边形掩模

// @ts-ignore
import { HeatmapLayer, PolygonLayer, Scene } from '@antv/l7';
// @ts-ignore
import { GaodeMap } from '@antv/l7-maps';

const scene = new Scene({
  id: 'map',

  map: new GaodeMap({
    center: [120.165, 30.26],
    pitch: 0,
    zoom: 2,
    style: 'dark',
  }),
});
scene.addImage(
  '00',
  'https://gw.alipayobjects.com/zos/basement_prod/604b5e7f-309e-40db-b95b-4fac746c5153.svg',
);
const maskData = {
  type: 'FeatureCollection',
  features: [
    {
      type: 'Feature',
      geometry: {
        type: 'MultiPolygon',
        coordinates: [
          [
            [
              [125.15625000000001, 8.407168163601076],
              [116.54296874999999, -21.289374355860424],
              [156.26953125, -20.632784250388013],
              [150.29296875, 2.1088986592431382],
            ],
          ],
          [
            [
              [78.57421875, 46.92025531537451],
              [51.67968749999999, 37.020098201368114],
              [87.890625, 28.76765910569123],
            ],
          ],
        ],
      },
    },
  ],
};

scene.on('loaded', () => {
  fetch('https://gw.alipayobjects.com/os/basement_prod/d3564b06-670f-46ea-8edb-842f7010a7c6.json')
    .then((res) => res.json())
    .then((data) => {
      const polygonLayer = new PolygonLayer({ visible: true })
        .source(maskData)
        .shape('fill')
        .color('#f00')
        .style({ opacity: 0.4 });
      const heatmapLayer = new HeatmapLayer({
        maskLayers: [polygonLayer],
        mask: false,
      })
        .source(data)
        .shape('heatmap') // heatmap3D heatmap
        .size('mag', [0, 1.0]) // weight映射通道
        .style({
          intensity: 2,
          radius: 20,
          opacity: 1.0,
          rampColors: {
            colors: ['#FF4818', '#F7B74A', '#FFF598', '#91EABC', '#2EA9A1', '#206C7C'].reverse(),
            positions: [0, 0.2, 0.4, 0.6, 0.8, 1.0],
          },
        });
      scene.addLayer(polygonLayer);
      scene.addLayer(heatmapLayer);
    });
});