vue项目中openlayers绘制行政区划 vue项目中openlayers绘制行政区划

vue项目中openlayers画行政区划（区域范围），供大家参考，具体内容如下
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：

文章图片

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.coordinateslet 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)})