地图显示级数

TIP

地图显示级数设置示例。

代码如下:

点我查看代码

vue

<template>
  <div class="top-bar">
    <el-input-number v-model="zoom" :min="1" :max="18" @change="setViewZoom" />
  </div>
  <div id="map"></div>
</template>

<script lang="ts" setup>
import { onMounted, onBeforeUnmount, ref } from "vue";
import L from "leaflet";
import { MAPURL, ATTRIBUTIONS } from "../../../constants";
const zoom = ref(10);
let map: L.Map | null = null;
const initMap = () => {
  //地图容器
  map = L.map("map", {
    zoomControl: false,
    //参考坐标系
    crs: L.CRS.EPSG3857,
    //显示中心
    center: [22.548857, 114.064839],
    //最小显示等级
    minZoom: 1,
    //最大显示等级
    maxZoom: 18,
    //当前显示等级
    zoom: 10,
    //限制显示地理范围
    maxBounds: L.latLngBounds(L.latLng(-180, -180), L.latLng(180, 180)),
  });
  //加载图层
  L.tileLayer(MAPURL, {
    noWrap: true,
    attribution: ATTRIBUTIONS,
  }).addTo(map);
};

// 设置显示地图级数
const setViewZoom = () => {
  //将地图按照指定级数显示
  map?.setView(map.getCenter(), zoom.value);
};

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

// 销毁地图
onBeforeUnmount(() => {
  if (map) {
    map.remove();
    map = null;
  }
});
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
#map {
  height: 650px;
  color: #3a3a3a;
}
.top-bar {
  height: 50px;
  line-height: 50px;
  text-align: center;
}
</style>

地图显示级数 ​

代码如下: ​

地图显示级数

代码如下: