Vue+Openlayers+elradio实现切换地图显示

场景

Vue+Openlayers+el-checkbox实现多选配置图层的显示和隐藏：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/122203044

上面实现图层的隐藏和显示，如果将图层换为各个地图的图层，那就可以实现切换地图的效果。

首先ol中至少实现加载两种地图。

Vue中使用Openlayers加载OSM(Open Street Map)显示街道地图：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/115826845

Vue+Openlayers实现加载天地图WMTS服务显示：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/122216401

结合以上两种地图加载显示，怎样实现如下切换地图效果

注：

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

1、页面中添加el-radio-group单选按钮组以及地图map

<template>
  <div>
    <div>
      <el-radio-group v-model="currentMap" @change="changeMap">
        <el-radio :label="1">天地图</el-radio>
        <el-radio :label="2">OSM地图</el-radio>
      </el-radio-group>
    </div>
    <div id="map" class="map"></div>
  </div>
</template>

2、引入相关依赖

import "ol/ol.css";
import Map from "ol/Map";
import TileLayer from "ol/layer/Tile";
import View from "ol/View";
import WMTS from "ol/source/WMTS";
import WMTSTileGrid from "ol/tilegrid/WMTS";
import { get as getProjection } from "ol/proj.js";
import { getWidth, getTopLeft } from "ol/extent.js";
import OSM from "ol/source/OSM";

3、声明地图、当前选中地图、天地图图层、OSM图层

  data() {
    return {
      map: null,
      currentMap: 1,
      tiandiLayer: null,
      osmLayer: null,
    };

4、声明map

      this.map = new Map({
        layers: [],
        target: "map",
        view: new View({
          center: [0, 0],
          zoom: 2,
        }),
      });

5、声明天地图

      //天地图参数配置
      var projection = getProjection("EPSG:3857");
      var projectionExtent = projection.getExtent();
      var size = getWidth(projectionExtent) / 256;
      var resolutions = new Array(18);
      var matrixIds = new Array(18);
      for (var z = 1; z < 19; ++z) {
        resolutions[z] = size / Math.pow(2, z);
        matrixIds[z] = z;
      }
      //天地图图层
      this.tiandiLayer = new TileLayer({
        opacity: 0.7,
        source: new WMTS({
          url: "http://t0.tianditu.gov.cn/vec_w/wmts?tk=你申请的key",
          layer: "vec", //注意每个图层这里不同
          matrixSet: "w",
          format: "tiles",
          style: "default",
          projection: projection,
          tileGrid: new WMTSTileGrid({
            origin: getTopLeft(projectionExtent),
            resolutions: resolutions,
            matrixIds: matrixIds,
          }),
          wrapX: true,
        }),
      });

6、声明OSM

      this.osmLayer = new TileLayer({
        source: new OSM(),
      });

7、将图层添加到地图

      this.map.addLayer(this.tiandiLayer);
      this.map.addLayer(this.osmLayer);

8、判断当前默认显示地图，控制图层显示与隐藏

      if (this.currentMap == 1) {
        this.tiandiLayer.setVisible(true);
        this.osmLayer.setVisible(false);
      }
      if (this.currentMap == 2) {
        this.tiandiLayer.setVisible(false);
        this.osmLayer.setVisible(true);
      }

9、编写el-radio-group的change事件

    changeMap: function (value) {
      debugger
      switch (value) {
        case 1:
          this.tiandiLayer.setVisible(true);
          this.osmLayer.setVisible(false);
          break;
        case 2:
          this.tiandiLayer.setVisible(false);
          this.osmLayer.setVisible(true);
          break;
        default:
          this.tiandiLayer.setVisible(true);
          this.osmLayer.setVisible(false);
      }
    },

10、完整示例代码

<template>
  <div>
    <div>
      <el-radio-group v-model="currentMap" @change="changeMap">
        <el-radio :label="1">天地图</el-radio>
        <el-radio :label="2">OSM地图</el-radio>
      </el-radio-group>
    </div>
    <div id="map" class="map"></div>
  </div>
</template>

<script>
import "ol/ol.css";
import Map from "ol/Map";
import TileLayer from "ol/layer/Tile";
import View from "ol/View";
import WMTS from "ol/source/WMTS";
import WMTSTileGrid from "ol/tilegrid/WMTS";
import { get as getProjection } from "ol/proj.js";
import { getWidth, getTopLeft } from "ol/extent.js";
import OSM from "ol/source/OSM";
export default {
  name: "olMapSwitchMap",
  data() {
    return {
      map: null,
      currentMap: 1,
      tiandiLayer: null,
      osmLayer: null,
    };
  },
  mounted() {
    this.initMap();
  },
  methods: {
    initMap() {
      this.map = new Map({
        layers: [],
        target: "map",
        view: new View({
          center: [0, 0],
          zoom: 2,
        }),
      });

      //天地图参数配置
      var projection = getProjection("EPSG:3857");
      var projectionExtent = projection.getExtent();
      var size = getWidth(projectionExtent) / 256;
      var resolutions = new Array(18);
      var matrixIds = new Array(18);
      for (var z = 1; z < 19; ++z) {
        resolutions[z] = size / Math.pow(2, z);
        matrixIds[z] = z;
      }
      //天地图图层
      this.tiandiLayer = new TileLayer({
        opacity: 0.7,
        source: new WMTS({
          url: "http://t0.tianditu.gov.cn/vec_w/wmts?tk=你申请的key",
          layer: "vec", //注意每个图层这里不同
          matrixSet: "w",
          format: "tiles",
          style: "default",
          projection: projection,
          tileGrid: new WMTSTileGrid({
            origin: getTopLeft(projectionExtent),
            resolutions: resolutions,
            matrixIds: matrixIds,
          }),
          wrapX: true,
        }),
      });
      this.osmLayer = new TileLayer({
        source: new OSM(),
      });

      this.map.addLayer(this.tiandiLayer);
      this.map.addLayer(this.osmLayer);
      if (this.currentMap == 1) {
        this.tiandiLayer.setVisible(true);
        this.osmLayer.setVisible(false);
      }
      if (this.currentMap == 2) {
        this.tiandiLayer.setVisible(false);
        this.osmLayer.setVisible(true);
      }
    },
    changeMap: function (value) {
      debugger
      switch (value) {
        case 1:
          this.tiandiLayer.setVisible(true);
          this.osmLayer.setVisible(false);
          break;
        case 2:
          this.tiandiLayer.setVisible(false);
          this.osmLayer.setVisible(true);
          break;
        default:
          this.tiandiLayer.setVisible(true);
          this.osmLayer.setVisible(false);
      }
    },
  },
};
</script>

<style scoped>
.map {
   100%;
  height: 400px;
}
</style>