Vue+Openlayers实现地图上绘制线

场景

Vue+Openlayers实现显示图片并分优先级多图层加载：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/121235987

上面是添加多个点的图层，如果添加线的图层，形如下面的效果

注：

博客：
https://blog.csdn.net/badao_liumang_qizhi

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实现

1、导入新的模块

//导入基本模块
import "ol/ol.css";
import Map from "ol/Map";
import View from "ol/View";
import { Point,LineString } from "ol/geom";
import Feature from "ol/Feature";
import { Icon,Style,Stroke} from "ol/style";
//导入相关模块
import { Tile as TileLayer , Vector as VectorLayer } from \'ol/layer\'
import { TileWMS ,Vector as VectorSource } from \'ol/source\'

2、声明一个线的图层和数据源

  data() {
    return {
      map: null, // map地图
      layer:null, //地图图层
      lightLayer:null, //灯图层
      houseLayer:null, //房子图层
      lineLayer:null, //线图层
      lineSource:null, //线数据源

3、添加要绘制的线的坐标数组

注意这里必须是数组嵌套数组的格式

      //线的数据
      lineData:[
        [986434.4063822062, 215782.0959711917],
        [989701.5290279881,217149.84072807242],
        [990613.3107184113,215946.4192185118],
      ],

这里是三个坐标点，会将这三个点依次连接起来

4、线的图层进行赋值

      //线的图层
      this.lineSource = new VectorSource({ wrapX: false });
      this.lineLayer = new VectorLayer({
          source: this.lineSource,
      });

5、map中加入线的图层

      this.map = new Map({
        //地图容器ID
        target: "map",
        //引入地图
        layers: [this.layer,this.lightLayer,this.houseLayer,this.lineLayer],
        view: new View({
          //地图中心点
          center: [987777.93778, 213834.81024],
          zoom: 12,
          minZoom:6, // 地图缩放最小级别
          maxZoom:19,
        }),
      });

6、页面加载完调用初始化地图的方法，方法中调用画线的方法

    //画线
    drawLine(){
      let pointData = this.lineData; // 所有点位信息
      //下边来添加一线feature
      var feature = new Feature({
          type: "lineStyle",
          geometry: new LineString(
              pointData // 线的坐标
          ),
      });
      let color = \'green\';
      let lineStyle = new Style({
          stroke: new Stroke({
              color: color,
              width: 4,
          }),
      });
      // 添加线的样式
      feature.setStyle(lineStyle);
      // 添加线的fature
      this.lineSource.addFeature(feature);
    },

7、完整示例代码

<template>
  <div id="map" class="map"></div>
</template>
<script>
//导入基本模块
import "ol/ol.css";
import Map from "ol/Map";
import View from "ol/View";
import { Point,LineString } from "ol/geom";
import Feature from "ol/Feature";
import { Icon,Style,Stroke} from "ol/style";
//导入相关模块
import { Tile as TileLayer , Vector as VectorLayer } from \'ol/layer\'
import { TileWMS ,Vector as VectorSource } from \'ol/source\'
export default {
  name: "olMapImageWMSMulLayers",
  data() {
    return {
      map: null, // map地图
      layer:null, //地图图层
      lightLayer:null, //灯图层
      houseLayer:null, //房子图层
      lineLayer:null, //线图层
      lineSource:null, //线数据源
      //红绿灯数据
      lightData:[
        {x:"987798.93778", y:"213885.81024"},
        {x:"987710.93778", y:"213810.81024"},
      ],
      //房子数据
      houseData:[
        {x:"986610.93778", y:"213885.81024"},
        {x:"986510.93778", y:"213810.81024"},
      ],
      //线的数据
      lineData:[
        [986434.4063822062, 215782.0959711917],
        [989701.5290279881,217149.84072807242],
        [990613.3107184113,215946.4192185118],
      ],
   };
  },
  mounted() {
    this.initMap();
    setInterval(() => {
      this.initLightData();
    }, 1000)
  },
  methods: {
    //初始化红绿灯数据
    initLightData(){
      this.lightLayer.getSource().clear();
      this.lightData.forEach((item, index) => {
          var feature = new Feature({
              geometry: new Point([Number(item.x), Number(item.y)]),
          });
          let url = "images/light.png";
          const zoom = this.map.getView().getZoom();
          let style = new Style({
                  image: new Icon({
                      scale: 0.15 * (zoom -13) ,
                      src: url,
                      anchor: [0.48, 0.52],
                  }),
              });
          feature.setStyle(style);
          this.lightLayer.getSource().addFeature(feature);
      });
    },
    //初始化房子数据
    initHouseData(){
      this.houseLayer.getSource().clear();
      this.houseData.forEach((item, index) => {
          var feature = new Feature({
              geometry: new Point([Number(item.x), Number(item.y)]),
          });
          let url = "images/house.png";
          let style = new Style({
                  image: new Icon({
                      scale: 0.3,
                      src: url,
                      anchor: [0.48, 0.52],
                  }),
              });
          feature.setStyle(style);
          this.houseLayer.getSource().addFeature(feature);
      });
    },
    //画线
    drawLine(){
      let pointData = this.lineData; // 所有点位信息
      //下边来添加一线feature
      var feature = new Feature({
          type: "lineStyle",
          geometry: new LineString(
              pointData // 线的坐标
          ),
      });
      let color = \'green\';
      let lineStyle = new Style({
          stroke: new Stroke({
              color: color,
              width: 4,
          }),
      });
      // 添加线的样式
      feature.setStyle(lineStyle);
      // 添加线的fature
      this.lineSource.addFeature(feature);
    },
    initMap() {
      //地图图层
      this.layer = new TileLayer({
        source: new TileWMS({
          //不能设置为0，否则地图不展示。
          ratio: 1,
          url: "http://localhost:8000/geoserver/nyc/wms",
          params: {
            LAYERS: "nyc:nyc_roads",
            STYLES: "",
            VERSION: "1.1.1",
            tiled: true
          },
          serverType: "geoserver",
        }),
      });
      // 红绿灯的图层
      this.lightLayer = new VectorLayer({
          source: new VectorSource(),
      });
      //房子的图层
      this.houseLayer = new VectorLayer({
          source: new VectorSource(),
      });
      //线的图层
      this.lineSource = new VectorSource({ wrapX: false });
      this.lineLayer = new VectorLayer({
          source: this.lineSource,
      });
      this.map = new Map({
        //地图容器ID
        target: "map",
        //引入地图
        layers: [this.layer,this.lightLayer,this.houseLayer,this.lineLayer],
        view: new View({
          //地图中心点
          center: [987777.93778, 213834.81024],
          zoom: 12,
          minZoom:6, // 地图缩放最小级别
          maxZoom:19,
        }),
      });
      this.initLightData();
      this.initHouseData();
      this.drawLine();
      //获取点的监听方法设置
      this.onPoint()
    },
    //  获取点
    onPoint() {
      // 监听singleclick事件
      this.map.on(\'singleclick\', function(e) {
        console.log(e.coordinate)
      })
    }
  },
};
</script>
<style scoped>
.map {
  width: 100%;
  height: 800px;
}
</style>