工作中我們總是會遇到許多“無敵”的需求，當我正在專心搬磚時，突然被老板打斷，他告訴我要在echarts地圖上畫一條鐵路線，
這，官方好像沒有這些api，但誰讓我是一個勇于挑戰的人呢，于是我在百度里遨游了半個多小時后，我只看到下面這些，傳送門：https://gallery.echartsjs.com/editor.html?c=xCDj68xRo1

但這并不符合我的需求，我想要線路圖，但不是這種只有終點和起點的線路，而是類似于公路一樣的線路，在掉了兩根頭發之后，我找到了下面的例子
傳送門：https://blog.csdn.net/bolanlaike/article/details/86234909

從這我得到了啟發，于是我開始繪制鐵路圖，我用的vue，所以代碼可能不一樣，但我們主要看options，首先加載準備好的地圖，想要地圖文件的小伙伴可以看我這篇博客
https://blog.csdn.net/qq_32610671/article/details/103199936
然后配置geo

axios.get("./static/json/map/map.json", {}).then(data => {//加載地圖文件// console.log(data);echarts.registerMap("map",data.data);this.chartOptions= {geo: {map: 'map',zoom: 4,roam:true,center:[116.4632992051,40.2979563489],label:{show:true,offset: [1, 1000],color:"#fff"},itemStyle: {color: '#1A3F57', //地圖背景色borderColor: '#516a89', //省市邊界線00fcff 516a89borderWidth: 1},emphasis: {itemStyle: {color: '#87CEEB' //懸浮背景},}},backgroundColor:"#013954",};})

效果如下：

然后我們配置lines，準備畫線，我的思路是在一條lines上加入多個轉彎點，這樣會比較形象，于是找了40多個點，分享一下我用的找點工具，在線經緯度查詢：http://www.gpsspg.com/maps.htm
代碼如下：

var trainLines=[[113.2299915090,39.9740137595],[113.2440222746,40.0112798938],[113.3205599644,39.9793044406],[113.5897397104,39.9935195891],[113.6323071328,40.0198128677],[113.8410727439,40.0150987625],[114.4927191451,40.2099428870],[114.6972954652,40.2848528330],[114.7763247358,40.2492769771],[115.1237282065,40.3351402443],[115.3980349329,40.3365057085],[115.5288097250,40.3541452998],[115.6386383872,40.3554242305],[115.7347770152,40.3962330991],[115.8220218461,40.4553254384],[115.9331074866,40.5098818055],[115.9976856501,40.4771481623],[116.0787930898,40.4188610923],[116.1805699260,40.3966647294],[116.3496784000,40.3334798038],[116.4363997773,40.2848511711],[116.4632992051,40.2979563489],[116.5608981005,40.2807742090],[116.6353132497,40.2810950813],[116.7438012799,40.2510310010],[116.8890266543,40.1809692086],[117.0436772920,40.1081611627],[117.0881500867,40.0402227345],[117.1534061331,39.9808125645],[117.3257262736,40.0097217651],[117.4160471025,40.0073872152],[117.4984682179,39.9753135523],[117.5904577438,39.9774022050],[117.6783250968,39.9584408860],[117.8170650554,40.0899211878],[117.9955507123,40.2273765912],[118.3897079730,40.1634100519],[118.5737399463,40.1844054101],[118.8497693728,40.0457762723],[119.0337606296,40.0068410146],[119.2590000686,40.0363047577],[119.4159339421,39.9429499750],[119.5889017503,39.9665806839],[119.6953706089,39.9866073744],[119.7109338177,39.9490638606],[119.6841482180,39.9455054281], ];//火車線路series: [{type:"lines",coordinateSystem: 'geo',// 這句的意思是連線是基于地理坐標的,geo組件將在下面給出polyline: true,// 這表示連線是否為多端點的連線data: [{coords: trainLines}],lineStyle: {color: "black",width:4,},progressiveThreshold: 500,progressive: 200,},]

效果如下：

于是我得到了這樣一坨黑線，但還是不夠形象，總覺得差了點東西，對，是黑白相間的鐵路，在我經過兩根頭發的消耗后，我又找到了解決辦法，那就是在畫一條一模一樣的虛線，顏色變為白色這樣就會出現，一截黑一截白的樣子，嗯，完美

series: [{type:"lines",coordinateSystem: 'geo',// 這句的意思是連線是基于地理坐標的,geo組件將在下面給出polyline: true,// 這表示連線是否為多端點的連線data: [{coords: trainLines}],lineStyle: {color: "black",width:4,},progressiveThreshold: 500,progressive: 200,},{type:"lines",coordinateSystem: 'geo',// 這句的意思是連線是基于地理坐標的,geo組件將在下面給出polyline: true,// 這表示連線是否為多端點的連線data: [{coords: trainLines}],lineStyle:{color:"#fff",width:4,type:"dashed",},progressiveThreshold: 500,progressive: 200,},]

于是得到了這樣一幅圖

完全ok，后期優化的時候我又加入了一個小火車圖標，圖標使用了svgpath格式，從阿里巴巴矢量圖標網下載的，具體可以參考這里：
https://www.iconfont.cn/
https://www.echartsjs.com/zh/option.html#series-lines.effect.symbol
并讓它在鐵路線上循環移動，感覺還是很不錯的，最終代碼如下：

<template><div style="width: 100%;height: 670px;"><chart id="chart" ref="chart" style="width:100%;height:100%" :options="chartOptions"></chart></div> </template><script>import echarts from "echarts";import axios from "axios"; var trainLines=[[113.2299915090,39.9740137595],[113.2440222746,40.0112798938],[113.3205599644,39.9793044406],[113.5897397104,39.9935195891],[113.6323071328,40.0198128677],[113.8410727439,40.0150987625],[114.4927191451,40.2099428870],[114.6972954652,40.2848528330],[114.7763247358,40.2492769771],[115.1237282065,40.3351402443],[115.3980349329,40.3365057085],[115.5288097250,40.3541452998],[115.6386383872,40.3554242305],[115.7347770152,40.3962330991],[115.8220218461,40.4553254384],[115.9331074866,40.5098818055],[115.9976856501,40.4771481623],[116.0787930898,40.4188610923],[116.1805699260,40.3966647294],[116.3496784000,40.3334798038],[116.4363997773,40.2848511711],[116.4632992051,40.2979563489],[116.5608981005,40.2807742090],[116.6353132497,40.2810950813],[116.7438012799,40.2510310010],[116.8890266543,40.1809692086],[117.0436772920,40.1081611627],[117.0881500867,40.0402227345],[117.1534061331,39.9808125645],[117.3257262736,40.0097217651],[117.4160471025,40.0073872152],[117.4984682179,39.9753135523],[117.5904577438,39.9774022050],[117.6783250968,39.9584408860],[117.8170650554,40.0899211878],[117.9955507123,40.2273765912],[118.3897079730,40.1634100519],[118.5737399463,40.1844054101],[118.8497693728,40.0457762723],[119.0337606296,40.0068410146],[119.2590000686,40.0363047577],[119.4159339421,39.9429499750],[119.5889017503,39.9665806839],[119.6953706089,39.9866073744],[119.7109338177,39.9490638606],[119.6841482180,39.9455054281], ];//火車線路//火車小圖標var trainPath="path://M807.4 938.5c-139.5-8-250.2-31.7-250.2-173.2v-95.5c0-35.5 72.5-64.3 108-64.3h0.3l0.9-152.4c0-8.5-6.9-15.4-15.4-15.4H373.2c-8.5 0-15.4 6.9-15.4 15.4l0.6 148.7c33.6 2.1 103.8 30 103.8 64.1v95.5c0 142.2-111.8 168.4-252.3 175.3l-0.1 0.3 0.9 71.5c0 8.5 6.9 15.4 15.4 15.4h568.1c8.5 0 15.4-6.9 15.4-15.4l-0.8-69.8-1.4-0.2zM598.2 64.5V18.6c0-8.5-6.9-15.4-15.4-15.4H428.6c-8.5 0-15.4 6.9-15.4 15.4V67C212.1 111.8 61.7 291.3 61.7 506c0 153.6 77 289.2 194.4 370.3l42.7-136.7C236 681 196.7 597.4 196.7 504.7c0-177.4 143.8-321.3 321.3-321.3s321.3 143.8 321.3 321.3c0 97.9-43.8 185.5-112.8 244.5l40.1 127.4C884.2 795.4 961.4 659.7 961.4 506c0-218.8-156.2-401.1-363.2-441.5z";export default {data(){return{chartOptions:{},}},mounted() {axios.get("./static/json/map/map.json", {}).then(data => {// console.log(data);echarts.registerMap("map",data.data);this.chartOptions= {series: [{type:"lines",//第一條實線coordinateSystem: 'geo',// 這句的意思是連線是基于地理坐標的,geo組件將在下面給出polyline: true,// 這表示連線是否為多端點的連線data: [{coords: trainLines}],lineStyle: {color: "black",width:4,},effect: {//線特效，小火車constantSpeed: 10,show: true,color: '#00EAFF',symbolSize: 15,symbol: trainPath,},progressiveThreshold: 500,progressive: 200,},{type:"lines",//第二條虛線coordinateSystem: 'geo',// 這句的意思是連線是基于地理坐標的,geo組件將在下面給出polyline: true,// 這表示連線是否為多端點的連線data: [{coords: trainLines}],lineStyle:{color:"#fff",width:4,type:"dashed",},progressiveThreshold: 500,progressive: 200,}],geo: {//地圖配置map: 'map',zoom: 4,roam:true,center:[116.4632992051,40.2979563489],label:{show:true,offset: [1, 1000],color:"#fff"},itemStyle: {color: '#1A3F57', //地圖背景色borderColor: '#516a89', //省市邊界線00fcff 516a89borderWidth: 1},emphasis: {itemStyle: {color: '#87CEEB' //懸浮背景},}},backgroundColor:"#013954",};})}}</script>

最終效果：

ok，大功告成，摸著我略微發涼的頭皮，目光遠眺，我仿佛看到了那天夕陽的奔跑，那是我逝去的青春！！！

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