基本操作

TIP
一些地图的基本操作。
代码如下:

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vue
<template>
  <div class="btns">
    <el-button type="primary" @click="handleZoomOut">单击缩小</el-button>
    <el-button type="primary" @click="handleZoomIn">单击放大</el-button>
    <el-button type="primary" @click="handlePanToSZ">平移到【深圳】</el-button>
    <el-button type="primary" @click="handleRestore">复位</el-button>
  </div>

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

<script lang="ts" setup>
import { onMounted, onBeforeUnmount } from "vue";
import { Map, View } from "ol";
import { Coordinate } from "ol/coordinate";
import { defaults, ZoomToExtent } from "ol/control";
import { Tile as TileLayer } from "ol/layer";
import { XYZ } from "ol/source";
import { MAPURL, ATTRIBUTIONS } from "../../../constants";

let map: Map | null = null;
//地图视图的初始参数
let view: View;
let zoom: number;
let center: Coordinate;
let rotation: number;

const raster = new TileLayer({
  source: new XYZ({
    attributions: ATTRIBUTIONS,
    url: MAPURL,
    maxZoom: 20,
  }),
});

const initMap = () => {
  map = new Map({
    //初始化map
    target: "map",
    controls: defaults({
      attributionOptions: {
        collapsible: true,
      },
    }).extend([
      new ZoomToExtent({
        extent: [
          // 坐标值
          813079.7791264898, 5929220.284081122, 848966.9639063801,
          5936863.986909639,
        ],
      }),
    ]),
    //地图容器中加载的图层
    layers: [
      //加载瓦片图层数据
      raster,
    ],
    view: new View({
      projection: "EPSG:4326", // 坐标系，有EPSG:4326和EPSG:3 857
      center: [0, 0], // 深圳坐标
      //地图初始显示级别
      zoom: 5,
      //最小级别
      minZoom: 1,
      //最大级别
      maxZoom: 18,
      //设置旋转角度
      rotation: Math.PI / 6,
    }),
  });
  //设置地图视图的初始参数
  view = map.getView();
  zoom = view.getZoom() || 5;
  center = view.getCenter() || [0, 0];
  rotation = view.getRotation();
};

// 缩小
const handleZoomOut = () => {
  if (map === null) return;
  //获取地图视图
  const view = map.getView();
  //获得当前缩放级数
  const zoom = view.getZoom();
  if (zoom) {
    //地图缩小一级
    view.setZoom(zoom - 1);
  }
};

//放大
const handleZoomIn = () => {
  if (map === null) return;
  //获取地图视图
  const view = map.getView();
  //获得当前缩放级数
  const zoom = view.getZoom();
  if (zoom) {
    //地图放大一级
    view.setZoom(zoom + 1);
  }
};

// 平移到深圳
const handlePanToSZ = () => {
  if (map === null) return;
  //获取地图视图
  const view = map.getView();
  //平移地图
  view.setCenter([114.064839, 22.548857]);
  view.setZoom(12);
};

// 复位
const handleRestore = () => {
  //初始中心点
  view.setCenter(center);
  //初始旋转角度
  view.setRotation(rotation);
  //初始缩放级数
  view.setZoom(zoom);
};

onMounted(() => {
  initMap();
});

onBeforeUnmount(() => {
  if (map) {
    map.dispose();
    map = null;
  }
});
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
#map {
  width: 100%;
  height: 650px;
}

.btns {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 50px;
}
</style>
基本操作 ​

代码如下: ​

基本操作

代码如下:
