这两天接到一个数据可视化的需求，要求展示当前选择的省、市到其他省市的产品迁徙数据，需求并不难，而且地图的可视化也比较成熟，echarts也有对应的例子，我们先看下预览图。

预览图：

简介

为什么要这篇笔记呢，有两个原因：

1. 防止下次再去找这些配置项，自己以前用过echarts，时间久了，导致接到echart的需求后，以前一些有关联的配置项没有记录，就需要重新过一遍api或者google百度，很浪费时间。
2. 大数据技术越来越多，用到地图可视化的效果也越来越多，把做地图迁徙效果的思路写一下，防止走弯路，如果大家看完后哪怕能提高十分钟或者五分钟的效率，这个笔记也就有一丢丢的价值了。

需求描述

我们的需求如下

• 1. 默认进去后地图展示各个省的迁出量
• 1. 选中某一个省后展示当前省到其他省的迁出量
• 1. 选中省的某一个市后，展示当前市到其他省的迁出量
• 1. 点击到其他省后，弹出柱状图显示当前城市到省会下所有城市的迁出量。

需求确定后，首先后端伙伴就是要数据格式，我们先要知道自己需要哪些数据，才能给到后端伙伴的格式。

开发步骤

1. 创建地理坐标系

创建div、样式这部分略过，然后创建geo地理坐标系组件，地理坐标系组件什么意思呢？官网这么说的，

官网文档，也就是我们可以在这个组件绘散点图和线图。

官网暂时不提供地图下载了，说部分数据不符合国家《测绘法》规定，API例子里拔了一下china.js文件，就是地图的数据文件，可以用，先看下效果。

var mapOption = {// 地图标题title : {text: 'XX城S端车源流向',subtext: '日期：2018-10-11',left: 'left',textStyle : {color: '#fff',fontSize:30},top:20,left:20},// 插入地图坐标系组件geo: {// 地图坐标系数据map: 'china',show:true,itemStyle: {// 背景色areaColor: '#000000',emphasis: {label:{show:false}}}}
};// 创建实例
myChart = echarts.init(document.getElementById('map'));
// 设置数据
myChart.setOption(mapOption);
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2. 创建地图系列色块

接下来我们再画一下地图根据数值来显示不同的颜色，这块大家可能会有点疑惑，怎么还画地图，不是已经出来了吗?

是这样，echart有区分组件和系列，组件有很多，比如title标题组件、legend图例组件、xAxis数据轴组件、tooltip提示框组件等等，其中就有我们刚才上面提到的地理坐标系组件，系列官网是这么解释的是

官网文档。

系列数据放在series配置下，可以放置多种类型，折线/面积图、柱状/条形图、饼图、散点图等。

这块刚接触的同学可能不太好理解，举个例子，坐标组件就相当于超市的货架，echarts提供多种货架，有口香糖货架，厨房用品货架、文具用品货架，而货架上方的东西虽然都是一类，但是有区分品牌，比如口香糖有绿箭、益达、炫迈等，品牌就是系列。

地理坐标系组件相当于口香糖货架，绿箭、益达、炫迈相当于地图系列、散点系列、线图系列。

系列数据放在serise属性里，我们先创建map地图系列，根据value值大小展示不同颜色，一般设计稿不会用插件默认的主题，配置主题色要用到visualMap视觉映射组件并设置其下的inRange属性，想把数据分成几段就设置几个就可以了，**但是必须设置max属性最大值，**代码如下。

// 增加地图系列
mapOption.series.push({name: '地图色块',// 系列类型type: 'map',mapType: 'china',// 禁用缩放roam: false,// 隐藏labellabel: {normal: {show: false},emphasis: {show: false}},// 禁用提示框tooltip:{show:false,},itemStyle:{// 默认颜色样式areaColor:'#0b1835',borderWidth:2,borderColor:'#244388',opacity:1},data:[{name: "山东",value: 541},{name: "山东",value: 341},{name: "西藏",value: 405},{name: "浙江",value: 380},{name: "广东",value: 371},{name: "贵州",value: 364},{name: "四川",value: 287},{name: "河南",value: 251},{name: "上海",value: 218},{name: "山西",value: 206}]}
});// 增加视觉映射组件
mapOption.visualMap.push({{type:'piecewise',// 不显示组件show:false,// 最大值 MaxArr为data重抽出的value数组max:Math.max.apply(null,MaxArr),// 仅对mapOption.series数组内下标为index系列数据生效seriesIndex:0,bottom:20,left:30,textStyle:{color:'#fff'},// 颜色值inRange: {color: ['#5c8eb1', '#0574ab','#055c9b']}}
})复制代码

3. 创建散点系列动画

设置选中省到其他省的迁徙效果，迁徙效果需要用三个系列组合，才能出现迁徙效果。

• 1. 散点，在各个省会位置显示散点动画
• 1. 实线，从当前城市指向目标城市带箭头的曲线。
• 1. 特效线，从当前城市指向目标城市带箭头的曲线。

散点绘制需要坐标，网上只找到了城市的坐标，没有省的，我自己把省会城市复制了一遍，然后改为省名称，省坐与省会城市一致，代码如下：

// 省会与城市坐标
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],"西藏":[91.11,29.97],"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],"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],"福建":[119.3,26.08],"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],"广东":[113.23,23.16],"广州":[113.23,23.16],"延安":[109.47,36.6],"山西":[112.53,37.87],"太原":[112.53,37.87],"清远":[113.01,23.7],"中山":[113.38,22.52],"云南":[102.73,25.04],"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],"海南":[110.35,20.02],"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],"辽宁":[123.38,41.8],"沈阳":[123.38,41.8],"苏州":[120.62,31.32],"茂名":[110.88,21.68],"嘉兴":[120.76,30.77],"吉林":[125.35,43.88],"长春":[125.35,43.88],"胶州":[120.03336,36.264622],"宁夏":[106.27,38.47],"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],"江西":[115.89,28.68],"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],"青海":[101.74,36.56],"宜宾":[104.56,29.77],"内蒙古":[111.65,40.82],"呼和浩特":[111.65,40.82],"四川":[104.06,30.67],"成都":[104.06,30.67],"大同":[113.3,40.12],"江苏":[119.44,32.2],"镇江":[119.44,32.2],"广西":[110.28,25.29],"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],"陕西":[108.95,34.27],"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],"重庆":[106.54,29.59],"台州":[121.420757,28.656386],"江苏":[118.78,32.04],"南京":[118.78,32.04],"滨州":[118.03,37.36],"贵州":[106.71,26.57],"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],"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],"新疆":[87.68,43.77],"乌鲁木齐":[87.68,43.77],"枣庄":[117.57,34.86],"浙江":[120.19,30.26],"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],"山东":[117,36.65],"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],"甘肃":[103.73,36.03],"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],"天津":[117.2,39.13],"富阳":[119.95,30.07],"泰安":[117.13,36.18],"诸暨":[120.23,29.71],"河南":[113.65,34.76],"郑州":[113.65,34.76],"黑龙江":[126.63,45.75],"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],"河北":[114.48,38.03],"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],"湖南":[113,28.21],"长沙":[113,28.21],"衢州":[118.88,28.97],"廊坊":[116.7,39.53],"菏泽":[115.480656,35.23375],"安徽":[117.27,31.86],"合肥":[117.27,31.86],"武汉":[114.31,30.52],"湖北":[114.31,30.52],"大庆":[125.03,46.58]
};
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echart要求的散点系列要求的数据格式如下:

{"name":"安徽","value":220,"tooltip":"迁出人效：0.22台\/人<br>总迁出量：220<br>总迁入量：149"
}
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需要省会名和value，使用symbolSize回调根据value设置散点大小，默认图标科技感不强，用symbol设置成自己做的png图片，然后在label的formatter方法设置一下要显示的label字段。

// 数据格式
var pan = [{"name":"安徽","value":220,"tooltip":"迁出人效：0.22台\/人<br>总迁出量：220<br>总迁入量：149"},{"name":"山东","value":24,"tooltip":"超值车数量：12<br>非超值数量：12<br>总数量：24"},{"name":"浙江","value":22,"tooltip":"超值车数量：17<br>非超值数量：5<br>总数量：22"},{"name":"广东","value":22,"tooltip":"超值车数量：14<br>非超值数量：8<br>总数量：22"},{"name":"西藏","value":15,"tooltip":"超值车数量：14<br>非超值数量：1<br>总数量：15"},{"name":"四川","value":14,"tooltip":"超值车数量：10<br>非超值数量：4<br>总数量：14"},{"name":"河南","value":14,"tooltip":"超值车数量：10<br>非超值数量：4<br>总数量：14"},{"name":"河北","value":9,"tooltip":"超值车数量：5<br>非超值数量：4<br>总数量：9"},{"name":"江西","value":8,"tooltip":"超值车数量：5<br>非超值数量：3<br>总数量：8"},{"name":"湖北","value":8,"tooltip":"超值车数量：7<br>非超值数量：1<br>总数量：8"},{"name":"陕西","value":8,"tooltip":"超值车数量：5<br>非超值数量：3<br>总数量：8"}
];// 添加系列数据
mapOption.series.push(		{name: '圆盘',type: 'effectScatter',coordinateSystem: 'geo',zlevel: 0,// 散点动画rippleEffect: {scale:3,brushType: 'stroke',},// 散点图标symbol:'image://images/symbol1.png',// 显示文字label: {normal: {show: true,position: 'right',color:'#fff',fontSize:10,// 会名称 + valueformatter: function(e){return e.name +':'+ e.data.value[2]},opacity:1},},// 根据value控制散点大小symbolSize: function (val) {return val[2] / 25;},itemStyle: {borderWidth:1,opacity:1,shadowColor: '#fff',},data: pan.map(function (dataItem) {return {name: dataItem.name,value:geoCoordMap[dataItem.name].concat([dataItem.value]),tooltip:dataItem.name + '<br>' +dataItem.tooltip};})}
)
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4. 创建线条系列实线与特效线

一条为实线，一条带动画的特效线，叠加在一起，效果就出来了。

echarts要求的lines系列数据格式如下：

// linses
{fromName: "安徽", toName: "浙江", coords: [[117.27, 31.86], // 起点坐标[120.19, 30.26]  // 末尾坐标]
}
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**这样来看我们就需要当前省的坐标和目标省坐标，**我们之前已经准备好坐标数据了，等于接口返回给我们当前省名称和目标省名称，我们自己再遍历取一下坐标就可以了，使用symbolSize调整剪头合适的大小。

画线的时候颜色需要注意下，实线深色，动画线浅色，这样有对比，效果要稍微好一些。

我们要求得到的数据如下：

var linesData = [[{"name":"安徽"},{"name":"浙江"}],[{"name":"安徽"},{"name":"上海"],[{"name":"安徽"},{"name":"西藏"],[{"name":"安徽"},{"name":"四川"],[{"name":"安徽"},{"name":"河南"],[{"name":"安徽"},{"name":"山西"],[{"name":"安徽"},{"name":"广东"],[{"name":"安徽"},{"name":"山东"],[{"name":"安徽"},{"name":"贵州"]
]
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遍历数据获取坐标，把数据塞进系列里

// lines数据遍历方法
var convertData = function (data) {var res = [];for (var i = 0; i < data.length; i++) {var dataItem = data[i];var fromCoord = geoCoordMap[dataItem[0].name];var toCoord = geoCoordMap[dataItem[1].name];if (fromCoord && toCoord) {res.push({fromName: dataItem[0].name,toName: dataItem[1].name,coords: [fromCoord, toCoord],});}}return res;
};	// 塞入数据
mapOption.series.push(// step3 实体线{name: '实体线',type: 'lines',zlevel: 1,symbol: ['none', 'arrow'],symbolSize: 5,lineStyle: {opacity: 0.1,normal: {color: '#67035a',width: 1,curveness: 0.2}},tooltip:{show:false,},data: convertData(linesData)},// step4 发光线{name: '发光',type: 'lines',zlevel: 2,// 特效配置effect: {show: true,period: 7,trailLength: 0.7,color: '#ff69ec',symbolSize: 3},tooltip:{show:false,},lineStyle: {normal: {color: '#fbff82',width: 0,curveness: 0.2}},data: convertData(linesData)}
)
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效果已经出来了。

5. 当前城市到目标省城，点击目标省弹出柱状图

城市到省就更简单了，把省的名称换成城市就好了，不再赘述。

简单说一下点击目标省出现当前省下所有城市的柱状图的思路。

给echart对象添加点击事件，只有echart对象可以添加点击事件，系列和组件都家布行，需要通过params判断点击的类型，如果是点击的散点，就展示div，创建一个chart就好了。

myChart.on('click', function (params) {if(params.componentSubType == "effectScatter"){$('.tootip,.mark').show();let option = {// some data  	};let Chart = echarts.init(document.getElementById('tootip'));Chart.setOption(option);}
});$('.clsBtn').click(function(){$('.tootip,.mark').hide();
});
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基本就实现了，下边是一些echart配置的关联项，翻文档或者搜索翻出来的，记录一下，熟悉的直接略过就可以了。

视觉映射组件的纵轴配置 dimension

在做左侧条形图的时候碰到一个问题，设置视觉映射组件后不生效，和预期不一样，见下图（左侧实际，右侧预期）：

原因是映射组件的数据维度指向错误，调整一下dimension指向就好了。

视觉映射组件仅对某一组系列数据生效 seriesIndex

在做地图的时候，希望数据映射组件只对地图系列生效，对散点不生效，以为是用id来绑定，后来翻了一下文档，用seriesIndex指向mapOption.series的下标，就只对当前下标生效了。

系列组件tooltip的显示与隐藏

需求是只有经过散点图的时候才显示tooltip组件，所以需要给tooltip.trigger属性为item，然后给不需要展示的系列增加tooltip.show属性为false。

总结

基本上就这些了，按照掘金的原则:

如果大家觉得哪里讲解的不是很清楚，希望提出来，我修改为可读性更高的笔记，笔记也需要迭代?，共同交流学习。

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