如何在Leaflet中绘制带有初始点的折线-Java 学习之路

我正在使用Leaflet.draw的自定义折线抽屉

let polylineDrawer = new L.Draw.Polyline(map, {})

polylineDrawer.enable()

我需要以编程方式将起点添加到折线

我试过调用 addVertex 的 L.Draw.Polyline . 看起来它's doesn'吨使用自定义折线抽屉导致 addHooks 或其他东西...试图改变来源，没有结果 .

启用抽屉后，还尝试在 Map 上触发 click . 像这样：

let point = new L.LatLng(x, y)

map.fireEvent('click', {
  latlng: point,
  layerPoint: map.latLngToLayerPoint(point),
  containerPoint: map.latLngToContainerPoint(point),
})

也行不通

编辑：实际上， AddVertex 确实可以使用自定义折线 . 它"didn't work"因为我在我的函数中传递了错误的参数 . 不知何故，我错过了 .

1 回答

在抽屉对象上使用 addVertex 可以让您为行添加起点：

var polylineDrawer = new L.Draw.Polyline(map, {})
polylineDrawer.enable();

var latlng = L.latLng(48.8583736, 2.2922926);
polylineDrawer.addVertex(latlng);

和一个演示

var style = {
    stroke: true,
    color: 'red',
    weight: 4,
    opacity: 0.5
};
var map = L.map(document.getElementById('map')).setView([48.8583736, 2.2922926], 15);

L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

var drawnItems = new L.geoJson(null, {style: style}).addTo(map);

map.on(L.Draw.Event.CREATED, function (event) {
    var layer = event.layer;
    drawnItems.addLayer(layer);
});

var polylineDrawer = new L.Draw.Polyline(map, {})
polylineDrawer.enable();

var latlng = L.latLng(48.8583736, 2.2922926);
polylineDrawer.addVertex(latlng);

html, body {
  height: 100%;
  margin: 0;
}
#map {
  width: 100%;
  height: 100%;
}

<link rel="stylesheet" href="https://unpkg.com/leaflet@1.2.0/dist/leaflet.css" integrity="sha512-M2wvCLH6DSRazYeZRIm1JnYyh22purTM+FDB5CsyxtQJYeKq83arPe5wgbNmcFXGqiSH2XR8dT/fJISVA1r/zQ==" crossorigin=""/>
    <script src="https://unpkg.com/leaflet@1.2.0/dist/leaflet.js" integrity="sha512-lInM/apFSqyy1o6s89K4iQUKg6ppXEgsVxT35HbzUupEVRh2Eu9Wdl4tHj7dZO0s1uvplcYGmt3498TtHq+log==" crossorigin=""></script>
    
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.12/leaflet.draw.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.12/leaflet.draw.js"></script>

<div id='map'></div>

回复于 2024-04-29T21:20:37+08:00

如何在Leaflet中绘制带有初始点的折线

1 回答

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