Vue+Openlayers实现地图缩放图标等比例缩放

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

上面实现的效果如下

 

如果要实现地图缩放时图标等比例放大缩小，效果如下

注：

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

1、首先在页面加载完之后，设置定时器进行一秒一次的渲染灯图层的数据。

    this.initMap();
    setInterval(() => {
      this.initLightData();
    }, 1000)
  },

这里是使用定时器的方式一秒执行一次的渲染灯图层的数据。

在真实业务中，这里可能是由后台推送的比如红绿灯的数据，然后进行定时的渲染灯图层的数据。

比如后台获取地图上所有红绿的信号，然后定时推送给前端，前端在收到数据后重新渲染灯的图层。

2、然后在渲染灯图层的方法中，获取当前地图的缩放等级，乘以一个比例，赋值给Style的image的

scale属性。

    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);
      });
    },

这里的scale的比例算法根据实际要的效果进行调整，这里的0.15是自己所需要的比例。

3、完整代码

<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 } 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'
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
      //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"},
      ],
   };
  },
  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);
      });
    },

    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()
    },
    //  获取点
    onPoint() {
      // 监听singleclick事件
      this.map.on('singleclick', function(e) {
        console.log(e.coordinate)
      })
    }
  },
};
</script>

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