Turf.js(地理空间GIS分析的js库)，处理地图相关算法

场景

Turf.js

Advanced geospatial analysis for browsers and Node.js

浏览器和Node.js的高级地理空间分析。

特点

Modular, simple-to-understand JavaScript functions that speak GeoJSON

模块化、简单易懂的JavaScript函数使用GeoJSON

Turf is a collection of small modules, you only need to take what you want to use

Turf是小模块的集合，你只需要拿你想用的

Takes advantage of the newest algorithms and doesn't require you to send data to a server

利用最新算法，不需要您将数据发送到服务器

官网：

http://turfjs.org/

中文网：

https://turfjs.fenxianglu.cn/

注：

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

1、安装turf

npm install @turf/turf

2、页面引入

import * as turf from '@turf/turf'

3、使用示例

计算点到线段的最短距离

         var pt = turf.point([0, 0]);
         var line = turf.lineString(e.layer.toGeoJSON().geometry.coordinates);
         var distance = turf.pointToLineDistance(pt, line, {units: 'miles'});

参数说明

判断点是否在多边形内

        var point = turf.point([-118.182003,34.04896]);
        var polygon = turf.polygon(e.layer.toGeoJSON().geometry.coordinates);
        var isInPolygon = turf.booleanPointInPolygon(point,polygon);

参数说明

4、其他方法具体使用参考官网

这里结合leaflet以及pm插件绘制事件之后做一个使用demo，具体可参考前文

Vue+Leaflet.PM插件实现创建和编辑几何图形(点、线、面、圆等)：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/126351717

完整示例代码

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

<script>
import "leaflet/dist/leaflet.css";
import L from "leaflet";
import "leaflet.pm";
import "leaflet.pm/dist/leaflet.pm.css";
import * as turf from "@turf/turf";
export default {
  name: "leafletWithTurf",
  data() {
    return {
      map: null,
      OSMUrl: "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
    };
  },
  mounted() {
    this.initMap();
  },
  methods: {
    initMap() {
      this.map = L.map("map");
      this.map.setView([34.03, -118.15], 13);
      let tileLayer = L.tileLayer(this.OSMUrl);
      tileLayer.addTo(this.map);

      // 添加绘制工具
      this.map.pm.setLang("zh");
      this.map.pm.addControls({
        position: "topleft",
        drawPolygon: true, //绘制多边形
        drawMarker: false, //绘制标记点
        drawCircleMarker: false, //绘制圆形标记
        drawPolyline: true, //绘制线条
        drawRectangle: false, //绘制矩形
        drawCircle: true, //绘制圆圈
        editMode: true, //编辑多边形
        dragMode: true, //拖动多边形
        cutPolygon: true, //添加⼀个按钮以删除多边形⾥⾯的部分内容
        removalMode: true, //清除多边形
      });

      // 全局设置绘制样式
      this.map.pm.setPathOptions({
        color: "orange",
        fillColor: "green",
        fillOpacity: 0.4,
      });

      // 或者单独设置绘制样式
      var options = {
        // 连接线标记之间的线
        templineStyle: {
          color: "red",
        },
        // 提⽰线从最后⼀个标记到⿏标光标的线
        hintlineStyle: {
          color: "red",
          dashArray: [5, 5],
        },
        // 绘制完成的样式
        pathOptions: {
          color: "orange",
          fillColor: "green",
        },
      };

      // 激活绘制多边形功能-1、单独设置某个模式的样式
      this.map.pm.enableDraw("Polygon", options);

      // 启用绘制--多边形功能
      this.map.pm.enableDraw("Polygon", {
        snappable: true, //启⽤捕捉到其他绘制图形的顶点
        snapDistance: 20, //顶点捕捉距离
      });

      this.map.on("pm:create", (e) => {
        debugger;
        //计算点到多线段的最短距离
        // var pt = turf.point([0, 0]);
        // var line = turf.lineString(e.layer.toGeoJSON().geometry.coordinates);
        // var distance = turf.pointToLineDistance(pt, line, {units: 'miles'});

        //判断点是否在多边形内
        var point = turf.point([-118.182003, 34.04896]);
        var polygon = turf.polygon(e.layer.toGeoJSON().geometry.coordinates);
        var isInPolygon = turf.booleanPointInPolygon(point, polygon);
      });
    },
  },
};
</script>

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