Efaa377bfedeb8eb0f25da26b4ad0b6a
leaflet 结合 Echarts4 实现散点图(附源码下载)

前言

leaflet 入门开发系列环境知识点了解:

内容概览

leaflet 结合 Echarts4 实现散点图
源代码 demo 下载

本篇 demo 利用 leaflet api 结合 Echarts4 实现散点图功能,效果图如下:

实现思路

  • 从官网下载 Echarts4 源码,通过 _theme进行定位,定位到 function Echarts(){ } 里面的 this._theme = theme$$1;添加一行代码: this._geo = Geo;
    echarts.js 修改之处:

  • 对 leaflet Layer 类进行扩展,新建 js 文件 leaflet-echarts.js,核心是 Echarts 的散点图其实也是在一个 Div 上画的,只要把这个 div 给拿到 map-pane 里面的 overlay-pane 。关于点的位置,因为 Echarts 内部自己有个把地理坐标转为像素坐标的方法,要重写 Echarts 内部方法 dataToPoint,完整的源码见文章尾部 demo 下载

  initECharts: function(){
    if(this._echart === null || this._echart === undefined){
      this._initECharts();
    }else {
      this._echart.dispose();
      this._initECharts();
    }
  },
  _initECharts: function() {
    if (this._echart = echarts.init(this._echartsContainer),
    "3.0" <= echarts.version) {
      var me = this;
      console.log(echarts.version);
      console.log(me._echart);
      me._echart._geo.prototype.dataToPoint = function(lnglat) {
        //重写Echarts内部方法,Ecahrts内部有一套将经纬度转为像素坐标的方法,这里要换成与Leaflet相匹配的
        var latlng = new L.latLng(lnglat[1],lnglat[0])
          , pixel = me._map.latLngToContainerPoint(latlng);
        return [pixel.x, pixel.y];  //给定地理坐标,返回相对于地图container容器的相应像素坐标。
      }
    }
    this._unbindEvent();//屏蔽Echarts相关事件
  },
  • 地图页面 html,引用js以及css
  <link rel="stylesheet" href="lib/leaflet/leaflet.css">
  <style>
    html, body, #map {
      height: 100%;
      padding: 0;
      margin: 0;
    }
  </style>
  <script src="lib/leaflet/leaflet.js"></script>
  <script src="lib/echarts.js"></script>
  <script src="lib/leaflet/leaflet-echarts.js"></script>
  • 散点图初始化调用
    ```
    //Echarts相关options配置
    var geoCoordMap = {
    "海门":[121.15,31.89],
    "鄂尔多斯":[109.781327,39.608266],
    "招远":[120.38,37.35],
    "舟山":[122.207216,29.985295],
    "齐齐哈尔":[123.97,47.33],
    "盐城":[120.13,33.38],
    "赤峰":[118.87,42.28],
    "青岛":[120.33,36.07],
    "乳山":[121.52,36.89],
    "金昌":[102.188043,38.520089],
    "泉州":[118.58,24.93],
    "莱西":[120.53,36.86],
    "日照":[119.46,35.42],
    "胶南":[119.97,35.88],
    "南通":[121.05,32.08],
    "拉萨":[91.11,29.97],
    "云浮":[112.02,22.93],
    "梅州":[116.1,24.55],
    "文登":[122.05,37.2],
    "上海":[121.48,31.22],
    "攀枝花":[101.718637,26.582347],
    "威海":[122.1,37.5],
    "承德":[117.93,40.97],
    "厦门":[118.1,24.46],
    "汕尾":[115.375279,22.786211],
    "潮州":[116.63,23.68],
    "丹东":[124.37,40.13],
    "太仓":[121.1,31.45],
    "曲靖":[103.79,25.51],
    "烟台":[121.39,37.52],
    "福州":[119.3,26.08],
    "瓦房店":[121.979603,39.627114],
    "即墨":[120.45,36.38],
    "抚顺":[123.97,41.97],
    "玉溪":[102.52,24.35],
    "张家口":[114.87,40.82],
    "阳泉":[113.57,37.85],
    "莱州":[119.942327,37.177017],
    "湖州":[120.1,30.86],
    "汕头":[116.69,23.39],
    "昆山":[120.95,31.39],
    "宁波":[121.56,29.86],
    "湛江":[110.359377,21.270708],
    "揭阳":[116.35,23.55],
    "荣成":[122.41,37.16],
    "连云港":[119.16,34.59],
    "葫芦岛":[120.836932,40.711052],
    "常熟":[120.74,31.64],
    "东莞":[113.75,23.04],
    "河源":[114.68,23.73],
    "淮安":[119.15,33.5],
    "泰州":[119.9,32.49],
    "南宁":[108.33,22.84],
    "营口":[122.18,40.65],
    "惠州":[114.4,23.09],
    "江阴":[120.26,31.91],
    "蓬莱":[120.75,37.8],
    "韶关":[113.62,24.84],
    "嘉峪关":[98.289152,39.77313],
    "广州":[113.23,23.16],
    "延安":[109.47,36.6],
    "太原":[112.53,37.87],
    "清远":[113.01,23.7],
    "中山":[113.38,22.52],
    "昆明":[102.73,25.04],
    "寿光":[118.73,36.86],
    "盘锦":[122.070714,41.119997],
    "长治":[113.08,36.18],
    "深圳":[114.07,22.62],
    "珠海":[113.52,22.3],
    "宿迁":[118.3,33.96],
    "咸阳":[108.72,34.36],
    "铜川":[109.11,35.09],
    "平度":[119.97,36.77],
    "佛山":[113.11,23.05],
    "海口":[110.35,20.02],
    "江门":[113.06,22.61],
    "章丘":[117.53,36.72],
    "肇庆":[112.44,23.05],
    "大连":[121.62,38.92],
    "临汾":[111.5,36.08],
    "吴江":[120.63,31.16],
    "石嘴山":[106.39,39.04],
    "沈阳":[123.38,41.8],
    "苏州":[120.62,31.32],
    "茂名":[110.88,21.68],
    "嘉兴":[120.76,30.77],
    "长春":[125.35,43.88],
    "胶州":[120.03336,36.264622],
    "银川":[106.27,38.47],
    "张家港":[120.555821,31.875428],
    "三门峡":[111.19,34.76],
    "锦州":[121.15,41.13],
    "南昌":[115.89,28.68],
    "柳州":[109.4,24.33],
    "三亚":[109.511909,18.252847],
    "自贡":[104.778442,29.33903],
    "吉林":[126.57,43.87],
    "阳江":[111.95,21.85],
    "泸州":[105.39,28.91],
    "西宁":[101.74,36.56],
    "宜宾":[104.56,29.77],
    "呼和浩特":[111.65,40.82],
    "成都":[104.06,30.67],
    "大同":[113.3,40.12],
    "镇江":[119.44,32.2],
    "桂林":[110.28,25.29],
    "张家界":[110.479191,29.117096],
    "宜兴":[119.82,31.36],
    "北海":[109.12,21.49],
    "西安":[108.95,34.27],
    "金坛":[119.56,31.74],
    "东营":[118.49,37.46],
    "牡丹江":[129.58,44.6],
    "遵义":[106.9,27.7],
    "绍兴":[120.58,30.01],
    "扬州":[119.42,32.39],
    "常州":[119.95,31.79],
    "潍坊":[119.1,36.62],
    "重庆":[106.54,29.59],
    "台州":[121.420757,28.656386],
    "南京":[118.78,32.04],
    "滨州":[118.03,37.36],
    "贵阳":[106.71,26.57],
    "无锡":[120.29,31.59],
    "本溪":[123.73,41.3],
    "克拉玛依":[84.77,45.59],
    "渭南":[109.5,34.52],
    "马鞍山":[118.48,31.56],
    "宝鸡":[107.15,34.38],
    "焦作":[113.21,35.24],
    "句容":[119.16,31.95],
    "北京":[116.46,39.92],
    "徐州":[117.2,34.26],
    "衡水":[115.72,37.72],
    "包头":[110,40.58],
    "绵阳":[104.73,31.48],
    "乌鲁木齐":[87.68,43.77],
    "枣庄":[117.57,34.86],
    "杭州":[120.19,30.26],
    "淄博":[118.05,36.78],
    "鞍山":[122.85,41.12],
    "溧阳":[119.48,31.43],
    "库尔勒":[86.06,41.68],
    "安阳":[114.35,36.1],
    "开封":[114.35,34.79],
    "济南":[117,36.65],
    "德阳":[104.37,31.13],
    "温州":[120.65,28.01],
    "九江":[115.97,29.71],
    "邯郸":[114.47,36.6],
    "临安":[119.72,30.23],
    "兰州":[103.73,36.03],
    "沧州":[116.83,38.33],
    "临沂":[118.35,35.05],
    "南充":[106.110698,30.837793],
    "天津":[117.2,39.13],
    "富阳":[119.95,30.07],
    "泰安":[117.13,36.18],
    "诸暨":[120.23,29.71],
    "郑州":[113.65,34.76],
    "哈尔滨":[126.63,45.75],
    "聊城":[115.97,36.45],
    "芜湖":[118.38,31.33],
    "唐山":[118.02,39.63],
    "平顶山":[113.29,33.75],
    "邢台":[114.48,37.05],
    "德州":[116.29,37.45],
    "济宁":[116.59,35.38],
    "荆州":[112.239741,30.335165],
    "宜昌":[111.3,30.7],
    "义乌":[120.06,29.32],
    "丽水":[119.92,28.45],
    "洛阳":[112.44,34.7],
    "秦皇岛":[119.57,39.95],
    "株洲":[113.16,27.83],
    "石家庄":[114.48,38.03],
    "莱芜":[117.67,36.19],
    "常德":[111.69,29.05],
    "保定":[115.48,38.85],
    "湘潭":[112.91,27.87],
    "金华":[119.64,29.12],
    "岳阳":[113.09,29.37],
    "长沙":[113,28.21],
    "衢州":[118.88,28.97],
    "廊坊":[116.7,39.53],
    "菏泽":[115.480656,35.23375],
    "合肥":[117.27,31.86],
    "武汉":[114.31,30.52],
    "大庆":[125.03,46.58]
    };

    var convertData = function (data) {
    var res = [];
    for (var i = 0; i < data.length; i++) {
    var geoCoord = geoCoordMap[data[i].name];
    if (geoCoord) {
    res.push({
    name: data[i].name,
    value: geoCoord.concat(data[i].value)
    });
    }
    }
    return res;
    };

    var option = {
    //backgroundColor: '#404a59',
    title: {
    text: '全国主要城市空气质量',
    subtext: '',

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