vue-amap高德1.4.4，区域掩膜效果

1. 区域掩膜
2. 区域内展示卫星图，区域外背景灰色–>实现原理，先用灰色样式，当区域掩膜实现之后再添加卫星图层

效果如下：

代码如下：

<template>
  <div>
    <div class="amap-page-container">
      <el-amap
        ref="map"
        vid="amapDemo"
        :center="center"
        :zoom="zoom"
        :plugin="plugin"
        :events="events"
        :pitch="pitch"
        viewMode="3D"
        class="amap-demo"
      >
      </el-amap>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      pitch: 60,
      zoom: 6,
      center: [121.59996, 31.197646],
      events: {
        init: this.initMap,
        moveend: () => {},
        zoomchange: () => {},
        click: (e) => {
          alert("map clicked");
        },
      },
      plugin: [
        "ToolBar",
        {
          pName: "MapType",
          defaultType: 0,
          events: {
            init(o) {
              console.log(o);
            },
          },
        },
      ],
    };
  },
  methods: {
    initMap(map) {
      setTimeout(() => {
        this.quyu(map);
        this.setSatelliteLayer();
      }, 200);
    },
    // 添加卫星图层
    setSatelliteLayer() {
      const tileLayer = new AMap.TileLayer.Satellite({
        map: this.$refs.map.$$getInstance(),
      });
      tileLayer.show();
    },
    // 区域掩膜效果
    quyu(map) {
      let opts = {
        subdistrict: 0,
        extensions: "all",
        level: "city",
      };
      //利用行政区查询获取边界构建mask路径
      //也可以直接通过经纬度构建mask路径
      let district = new AMap.DistrictSearch(opts);
      district.search("北京市", function (status, result) {
        let bounds = result.districtList[0].boundaries;
        let mask = [];
        for (let i = 0; i < bounds.length; i += 1) {
          mask.push([bounds[i]]);
        }
        map.setMask(mask);
        // 设置地图中心点为北京
        map.setCenter([116.397428, 39.90923]);
        map.setZoom(10);
        map.setMapStyle("amap://styles/grey");
        map.setFitView();
        //添加高度面
        let object3Dlayer = new AMap.Object3DLayer({ zIndex: 1 });
        map.add(object3Dlayer);
        let height = -18000;
        let color = "#0088ffcc"; //rgba
        let wall = new AMap.Object3D.Wall({
          path: bounds,
          height: height,
          color: color,
        });
        wall.transparent = true;
        object3Dlayer.add(wall);
        //添加描边
        for (let i = 0; i < bounds.length; i += 1) {
          new AMap.Polyline({
            path: bounds[i],
            strokeColor: "#99ffff",
            strokeWeight: 4,
            map: map,
          });
        }
       
      });
    },
  },
};
</script>

<style lang="less" scoped>
.amap-page-container {
  width: 100%;
  height: 900px;
  position: relative;

  .amap-demo {
    width: 100%;
    height: 100%;
  }
}
</style>