Vue+Openlayers實現地圖上繪制線

場景

Vue+Openlayers實現顯示圖片並分優先級多圖層加載：

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

上面是添加多個點的圖層，如果添加線的圖層，形如下面的效果

 

 

注：

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

1、導入新的模塊

//導入基本模塊
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";
//導入相關模塊
import { Tile as TileLayer , Vector as VectorLayer } from 'ol/layer'
import { TileWMS ,Vector as VectorSource } from 'ol/source'

2、聲明一個線的圖層和數據源

  data() {
    return {
      map: null, // map地圖
      layer:null, //地圖圖層
      lightLayer:null, //燈圖層
      houseLayer:null, //房子圖層
      lineLayer:null, //線圖層
      lineSource:null, //線數據源

3、添加要繪制的線的坐標數組

注意這里必須是數組嵌套數組的格式

      //線的數據
      lineData:[
        [986434.4063822062, 215782.0959711917],
        [989701.5290279881,217149.84072807242],
        [990613.3107184113,215946.4192185118],
      ],

這里是三個坐標點，會將這三個點依次連接起來

4、線的圖層進行賦值

      //線的圖層
      this.lineSource = new VectorSource({ wrapX: false });
      this.lineLayer = new VectorLayer({
          source: this.lineSource,
      });

5、map中加入線的圖層

      this.map = new Map({
        //地圖容器ID
        target: "map",
        //引入地圖
        layers: [this.layer,this.lightLayer,this.houseLayer,this.lineLayer],
        view: new View({
          //地圖中心點
          center: [987777.93778, 213834.81024],
          zoom: 12,
          minZoom:6, // 地圖縮放最小級別
          maxZoom:19,
        }),
      });

6、頁面加載完調用初始化地圖的方法，方法中調用畫線的方法

    //畫線
    drawLine(){
      let pointData = this.lineData; // 所有點位信息
      //下邊來添加一線feature
      var feature = new Feature({
          type: "lineStyle",
          geometry: new LineString(
              pointData // 線的坐標
          ),
      });
      let color = 'green';
      let lineStyle = new Style({
          stroke: new Stroke({
              color: color,
              width: 4,
          }),
      });
      // 添加線的樣式
      feature.setStyle(lineStyle);
      // 添加線的fature
      this.lineSource.addFeature(feature);
    },

7、完整示例代碼

<template>
  <div id="map" class="map"></div>
</template>

<script>
//導入基本模塊
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";
//導入相關模塊
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地圖
      layer:null, //地圖圖層
      lightLayer:null, //燈圖層
      houseLayer:null, //房子圖層
      lineLayer:null, //線圖層
      lineSource:null, //線數據源
      //紅綠燈數據
      lightData:[
        {x:"987798.93778", y:"213885.81024"},
        {x:"987710.93778", y:"213810.81024"},
      ],
      //房子數據
      houseData:[
        {x:"986610.93778", y:"213885.81024"},
        {x:"986510.93778", y:"213810.81024"},
      ],
      //線的數據
      lineData:[
        [986434.4063822062, 215782.0959711917],
        [989701.5290279881,217149.84072807242],
        [990613.3107184113,215946.4192185118],
      ],
   };
  },
  mounted() {
    this.initMap();
    setInterval(() => {
      this.initLightData();
    }, 1000)
  },
  methods: {

    //初始化紅綠燈數據
    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);
      });
    },

    //初始化房子數據
    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);
      });
    },

    //畫線
    drawLine(){
      let pointData = this.lineData; // 所有點位信息
      //下邊來添加一線feature
      var feature = new Feature({
          type: "lineStyle",
          geometry: new LineString(
              pointData // 線的坐標
          ),
      });
      let color = 'green';
      let lineStyle = new Style({
          stroke: new Stroke({
              color: color,
              width: 4,
          }),
      });
      // 添加線的樣式
      feature.setStyle(lineStyle);
      // 添加線的fature
      this.lineSource.addFeature(feature);
    },
    initMap() {
      //地圖圖層
      this.layer = new TileLayer({
        source: new TileWMS({
          //不能設置為0，否則地圖不展示。
          ratio: 1,
          url: "http://localhost:8000/geoserver/nyc/wms",
          params: {
            LAYERS: "nyc:nyc_roads",
            STYLES: "",
            VERSION: "1.1.1",
            tiled: true
          },
          serverType: "geoserver",
        }),
      });

      // 紅綠燈的圖層
      this.lightLayer = new VectorLayer({
          source: new VectorSource(),
      });
     
      //房子的圖層
      this.houseLayer = new VectorLayer({
          source: new VectorSource(),
      });

      //線的圖層
      this.lineSource = new VectorSource({ wrapX: false });
      this.lineLayer = new VectorLayer({
          source: this.lineSource,
      });

      this.map = new Map({
        //地圖容器ID
        target: "map",
        //引入地圖
        layers: [this.layer,this.lightLayer,this.houseLayer,this.lineLayer],
        view: new View({
          //地圖中心點
          center: [987777.93778, 213834.81024],
          zoom: 12,
          minZoom:6, // 地圖縮放最小級別
          maxZoom:19,
        }),
      });

      this.initLightData();
      this.initHouseData();
      this.drawLine();
      //獲取點的監聽方法設置
      this.onPoint()
    },
    //  獲取點
    onPoint() {
      // 監聽singleclick事件
      this.map.on('singleclick', function(e) {
        console.log(e.coordinate)
      })
    }
  },
};
</script>

<style scoped>
.map {
  width: 100%;
  height: 800px;
}
</style>