場景

Leaflet快速入門與加載OSM顯示地圖：

Leaflet快速入門與加載OSM顯示地圖_霸道流氓氣質的博客-CSDN博客_leaflet 顯示地圖

在上面的基礎上怎樣實現水流模擬效果。

水流模擬，即一條線從起點出發，隨著時間不斷變長，直至到達終點。

Leaflet提供了setLatLngs()方法，供用戶修改線坐標，再結合JavaScript定時器，不斷地修改線坐標，達到

線動態變長的效果。

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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實現

1、下載插件并引入依賴和水流路線數據

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

2、路徑數據再插件倉庫中有

獲取線的數據

??????? //線坐標數組var latlngs = new Array();//獲取線數據for (var i = 0, len = route.length; i < len; i++) {latlngs.push(new L.LatLng(route[i][0], route[i][1]));}

3、也可以用如下路徑數據

var 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4、創建線圖層并添加起始點標注，啟動模擬

??????? //創建線圖層path = L.polyline(latlngs, { snakingSpeed: 30 });//在起點處添加一個標注map.addLayer(L.marker(latlngs[0]));//在終點處添加一個標注map.addLayer(L.marker(latlngs[len - 1]));//將線圖層添加至地圖中map.addLayer(path);//啟動模擬path.snakeIn();

5、完整示例代碼

? <!doctype html> <html lang="en"><head><meta charset="UTF-8"><title>leaflet水流模擬</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);//線坐標數組var latlngs = new Array();//獲取線數據for (var i = 0, len = route.length; i < len; i++) {latlngs.push(new L.LatLng(route[i][0], route[i][1]));}//創建線圖層path = L.polyline(latlngs, { snakingSpeed: 30 });//在起點處添加一個標注map.addLayer(L.marker(latlngs[0]));//在終點處添加一個標注map.addLayer(L.marker(latlngs[len - 1]));//將線圖層添加至地圖中map.addLayer(path);//啟動模擬path.snakeIn();</script> </body></html>?

總結

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