一级目录

原理

在地图上画需要的范围，实际上就是在地图上打上一圈点，然后依次将这些点用线连接，就形成了范围

引用相应的ol模块

import VectorLayer from 'ol/layer/Vector'
import VectorSource from 'ol/source/Vector'
import { Map, View, Feature } from 'ol'
import { Style, Icon, Stroke } from 'ol/style'
import { Point, LineString, Polygon } from 'ol/geom'

获取范围点

这里我将点放在json文件中，然后通过axios读取
json文件截图：

      axios.get('static/常德市.json').then((res) => {
        let arr = res.data.coordinates
        let polygonFeature = new Feature({
          type: 'polygon',
          geometry: new Polygon(arr[0])
        })
        polygonFeature.setStyle(new Style({
          stroke: new Stroke({
            width: 2,

            color: [255, 255, 0, 0.8]
          }),
          fill: new Fill({
            color: [248, 172, 166, 0.2]
          })
          // text: new Text({
          //   text: '这是区域'
          // })
        }))
        let polygonLayer = new VectorLayer({
          source: new VectorSource({
            features: [polygonFeature]
          })
        })
        this.gmap.addLayer(polygonLayer)
      })
      axios.get('static/怀化市沅陵县.json').then((res) => {
        let arr = res.data.coordinates
        let polygonFeature = new Feature({
          type: 'polygon',
          geometry: new Polygon(arr[0])
        })
        polygonFeature.setStyle(new Style({
          stroke: new Stroke({
            width: 2,
            color: [255, 255, 0, 0.8]
          }),
          fill: new Fill({
            color: [248, 172, 166, 0.2]
          })
          // text: new Text({
          //   text: '这是区域'
          // })
        }))
        let polygonLayer = new VectorLayer({
          source: new VectorSource({
            features: [polygonFeature]
          })
        })
        this.gmap.addLayer(polygonLayer)
      })