Vue+Openlayers实现显示图片并分优先级多图层加载

场景

Vue中使用Openlayers加载Geoserver发布的TileWMS： 

Vue中使用Openlayers加载Geoserver发布的TileWMS_BADAO_LIUMANG_QIZHI的博客-CSDN博客

在上面的基础上实现加载地图显示，如果要在地图上添加图片图层显示效果如下

注：

博客：
BADAO_LIUMANG_QIZHI的博客_霸道流氓气质_CSDN博客
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实现

1、跟上面的博客相比，导入的模块增多

import "ol/ol.css";
import Map from "ol/Map";
import View from "ol/View";
import { Point } from "ol/geom";
import Feature from "ol/Feature";
import { Icon,Style} 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、这里要在原先地图图层的基础上，再加两个图层分别为灯图层和房子图层。

声明图层对象和灯图层以及房子图层的坐标数据。

  data() {
    return {
      map: null, // map地图
      layer:null, //地图图层
      lightLayer:null, //灯图层
      houseLayer:null, //房子图层
      //红绿灯数据
      lightData:[
        {x:"987798.93778", y:"213885.81024"},
        {x:"987710.93778", y:"213810.81024"},
      ],
      //房子数据
      houseData:[
        {x:"987610.93778", y:"213885.81024"},
        {x:"987510.93778", y:"213810.81024"},
      ],
   };
  },

3、页面加载完成后调用初始化地图的方法

  mounted() {
    this.initMap();
  },

在初始化地图的方法中

​
    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(),
      });

      this.map = new Map({
        //地图容器ID
        target: "map",
        //引入地图
        layers: [this.layer,this.lightLayer,this.houseLayer],
        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();
      //获取点的监听方法设置
      this.onPoint()
    },

​

在这里先声明两个图层lightLayer和houseLayer，然后最后调用给这两个图层加载数据的方法。

4、这里决定图层上下优先级顺序的是

layers: [this.layer,this.lightLayer,this.houseLayer],

越往左，图层越在底层，当三个图层重合时，从上往下依次看到的是房子图层、灯图层、地图图层 

5、然后调用加载图层坐标数据的方法

方法initLightData

    //初始化灯数据
    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";
          let style = new Style({
                  image: new Icon({
                      scale: 0.15 ,
                      src: url,
                      anchor: [0.48, 0.52],
                  }),
              });
          feature.setStyle(style);
          this.lightLayer.getSource().addFeature(feature);
      });
    },

方法initHouseData

    //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);
      });
    },

6、完整代码

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