如何在传单中绘制带有初始点的折线

Question

我正在使用来自 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

我试过打电话给 L.Draw.Polyline 的 addVertex。看起来它不适用于 addHooks 或其他原因的自定义折线抽屉...尝试更改源，没有结果。

还尝试在抽屉启用后在地图上触发 click。像这样：

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

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

同样无效

编辑：实际上，AddVertex 确实适用于自定义折线。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。

Answer 1

在你的抽屉对象上使用 addVertex 确实可以让你在你的行中添加一个起点：

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

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

和演示

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>

如何在传单中绘制带有初始点的折线

How to draw a polyline with initial point in Leaflet

leaflet

leaflet.draw