场景

Leaflet快速入门与加载OSM显示地图：

Leaflet快速入门与加载OSM显示地图_霸道流氓气质的博客-CSDN博客_leaflet 显示地图

在上面的基础上怎样实现水流模拟效果。

水流模拟，即一条线从起点出发，随着时间不断变长，直至到达终点。

Leaflet提供了setLatLngs()方法，供用户修改线坐标，再结合JavaScript定时器，不断地修改线坐标，达到

线动态变长的效果。

插件地址：

htthttps://github.com/IvanSanchez/Leaflet.Polyline.SnakeAnim

注：

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

1、下载插件并引入依赖和水流路线数据

    <script type="text/javascript" src="./js/L.Polyline.SnakeAnim.js"></script><script type="text/javascript" src="./data/lujing.js"></script>

2、路径数据再插件仓库中有

获取线的数据

        //线坐标数组var latlngs = new Array();//获取线数据for (var i = 0, len = route.length; i < len; i++) {latlngs.push(new L.LatLng(route[i][0], route[i][1]));}

3、也可以用如下路径数据

var route=[[34.268043518066406,90.56607055664062],[34.32582092285156,91.21858215332031],[34.242210388183594,91.82025146484375],[34.129150390625,91.99998474121094],[34.23942565917969,92.16552734375],[34.19970703125,92.60163879394531],[34.11914825439453,92.64970397949219],[34.077484130859375,92.82191467285156],[34.09288787841797,92.94024658203125],[34.235260009765625,93.19273376464844],[34.210540771484375,93.65830993652344],[34.25720977783203,93.80691528320312],[34.55137634277344,94.05218505859375],[34.57470703125,94.25469970703125],[34.75665283203125,94.54774475097656],[34.68072509765625,94.921630859375],[34.58137512207031,95.002197265625],[34.454986572265625,95.30662536621094],[34.48442840576172,95.33331298828125],[34.34886932373047,95.4830322265625],[34.327484130859375,95.56358337402344],[34.23109436035156,95.57025146484375],[34.21165466308594,95.66746520996094],[33.890541076660156,95.9246826171875],[33.76304626464844,96.17802429199219],[33.784156799316406,96.21218872070312],[33.72081756591797,96.26052856445312],[33.765541076660156,96.37162780761719],[33.68415832519531,96.40052795410156],[33.58637237548828,96.61996459960938],[33.547210693359375,96.69662475585938],[33.39276123046875,96.74607849121094],[33.32026672363281,96.85246276855469],[33.315818786621094,97.01469421386719],[33.21942901611328,97.01803588867188],[32.8438720703125,97.38441467285156],[32.77720642089844,97.38414001464844],[32.672210693359375,97.46441650390625],[32.34248352050781,98.21080017089844],[32.24553680419922,98.2169189453125],[31.983600616455078,98.44969177246094],[31.89804458618164,98.44662475585938],[31.879432678222656,98.40997314453125],[31.570823669433594,98.62274169921875],[31.354442596435547,98.87718200683594],[31.229713439941406,98.7774658203125],[31.31110382080078,98.64442443847656],[31.227489471435547,98.60662841796875],[30.98415756225586,98.79997253417969],[30.89443588256836,98.7774658203125],[30.74498748779297,98.9527587890625],[30.679157257080078,98.90580749511719],[29.933048248291016,99.04913330078125],[29.675548553466797,98.98385620117188],[29.24997329711914,99.09640502929688],[28.71609878540039,99.11607360839844],[28.518600463867188,99.17941284179688],[28.431659698486328,99.15553283691406],[28.121051788330078,99.39851379394531],[27.850826263427734,99.4588623046875],[27.760272979736328,99.43801879882812],[27.323326110839844,99.6483154296875],[27.040828704833984,99.93302917480469],[26.882770538330078,99.96580505371094],[26.94943618774414,100.0596923828125],[27.16666030883789,100.0577392578125],[27.33443832397461,100.23523712158203],[27.510272979736328,100.18551635742188],[27.825271606445312,100.29692077636719],[27.843048095703125,100.4013671875],[27.801105499267578,100.43329620361328],[27.51055145263672,100.44217681884766],[27.43749237060547,100.53941345214844],[27.219711303710938,100.53968811035156],[27.189712524414062,100.43496704101562],[27.138885498046875,100.48857116699219],[26.818603515625,100.45303344726562],[26.78777313232422,100.38996887207031],[26.361103057861328,100.44940185546875],[26.317214965820312,100.4072036743164],[26.214157104492188,100.44830322265625],[26.198047637939453,100.93885803222656],[26.309158325195312,101.05580139160156],[26.415267944335938,101.45525360107422],[26.51694107055664,101.44412231445312],[26.59054946899414,101.5083236694336],[26.593883514404297,101.61414337158203],[26.55971908569336,101.68357849121094],[26.602550506591797,101.79888916015625],[26.583602905273438,101.83997344970703],[26.344158172607422,101.94190979003906],[26.181446075439453,101.87702941894531],[25.993045806884766,101.82803344726562],[25.97110366821289,101.86469268798828],[25.988601684570312,102.066650390625],[26.08159637451172,102.10711669921875],[26.224716186523438,102.25080871582031],[26.374713897705078,102.56468200683594],[26.344993591308594,102.62386322021484],[26.261661529541016,102.60246276855469],[26.21860122680664,102.67579650878906],[26.35332489013672,102.98052978515625],[26.54110336303711,103.05940246582031],[27.024993896484375,102.8721923828125],[27.121936798095703,102.91468811035156],[27.27527618408203,102.88246154785156],[27.412769317626953,102.94551086425781],[27.373882293701172,102.99385070800781],[27.42046356201172,103.14105224609375],[27.525272369384766,103.17829895019531],[27.834716796875,103.49968719482422],[27.978046417236328,103.56552124023438],[27.97693634033203,103.50496673583984],[28.11943817138672,103.44830322265625],[28.26638412475586,103.63609313964844],[28.207763671875,103.71053314208984],[28.318607330322266,103.87523651123047],[28.52721405029297,103.78996276855469],[28.663043975830078,103.84774780273438],[28.60443878173828,103.9516372680664],[28.66193389892578,104.24858093261719],[28.621654510498047,104.30580139160156],[28.638320922851562,104.45858764648438],[28.77971649169922,104.60025024414062],[28.82666015625,104.81693267822266],[28.777488708496094,104.91829681396484],[28.836380004882812,104.98441314697266],[28.821659088134766,105.01997375488281],[28.758323669433594,105.01109313964844],[28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4、创建线图层并添加起始点标注，启动模拟

        //创建线图层path = L.polyline(latlngs, { snakingSpeed: 30 });//在起点处添加一个标注map.addLayer(L.marker(latlngs[0]));//在终点处添加一个标注map.addLayer(L.marker(latlngs[len - 1]));//将线图层添加至地图中map.addLayer(path);//启动模拟path.snakeIn();

5、完整示例代码

​
<!doctype html>
<html lang="en"><head><meta charset="UTF-8"><title>leaflet水流模拟</title><link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" /><style>html,body,#map {padding: 0;margin: 0;width: 100%;height: 100%;overflow: hidden;}</style>
</head><body><div id="map"></div><script type="text/javascript" src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script><script type="text/javascript" src="./js/L.Polyline.SnakeAnim.js"></script><script type="text/javascript" src="./data/route.js"></script><script type="text/javascript">var map = L.map('map').setView([36.09, 120.35], 5);L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {attribution: ''}).addTo(map);//线坐标数组var latlngs = new Array();//获取线数据for (var i = 0, len = route.length; i < len; i++) {latlngs.push(new L.LatLng(route[i][0], route[i][1]));}//创建线图层path = L.polyline(latlngs, { snakingSpeed: 30 });//在起点处添加一个标注map.addLayer(L.marker(latlngs[0]));//在终点处添加一个标注map.addLayer(L.marker(latlngs[len - 1]));//将线图层添加至地图中map.addLayer(path);//启动模拟path.snakeIn();</script>
</body></html>​

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