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我想在已加載的點和右擊標記點之間添加行。我已經提到了Mapbox的例子，並且已經到了這個階段。我只有一條線，我第一次執行操作。我需要每個操作的行。是操作的順序如下：GeoJson LineString在Mapbox地圖中第一次點擊後只加載一次
- 上加載點（點從GeoJSON的加載）左鍵點擊
- 右鍵點擊地圖上的任意位置。 這應該在右鍵單擊點創建一個標記，並將其與之前離開點的點相連接。
我希望得到一些幫助。這是我在SO的第一篇文章。請原諒我的錯誤。先謝謝你。
mapboxgl.accessToken = 'pk.eyJ1Ijoic3ViaGFtYmFuc3BocyIsImEiOiJjajc4czNxazEyaWE5MnFwaWllNzdwdDdkIn0.6AZVCVM-wGgh5cykoII9kA';
var map = new mapboxgl.Map({
container: 'map', // container id
style: 'mapbox://styles/mapbox/streets-v9',
center: [-80.486052, 37.830348], // starting position
zoom: 5 // starting zoom
});
map.on('load',() => {
map.addSource("earthquakes", {
type: "geojson",
data: "https://www.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson"
});
map.addLayer({
id: "markers",
type: "circle",
source: "earthquakes",
paint: {
"circle-color": "#11b4da",
"circle-radius": 4,
"circle-stroke-width": 1,
"circle-stroke-color": "#fff"
}
});
});
map.on('mouseenter', 'markers',() => {
map.getCanvas().style.cursor = 'pointer'
});
map.on('mouseleave', 'markers',() => {
map.getCanvas().style.cursor = 'crosshair'
});
let ground
let obs
map.on('contextmenu', (f) => {
ground = [f.lngLat.lng, f.lngLat.lat]
var geojson = {
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": f.lngLat
}
}]
};
// add markers to map
geojson.features.forEach(function(marker) {
// create a DOM element for the marker
var el = document.createElement('div');
el.className = 'marker';
el.addEventListener('click', function() {
window.alert(f.lngLat);
})
new mapboxgl.Marker(el)
.setLngLat(marker.geometry.coordinates)
.addTo(map);
map.addLayer({
"id": "route",
"type": "line",
"source": {
"type": "geojson",
"data": {
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": [
ground, obs
]
}
}, ]
}
},
"layout": {
"line-join": "round",
"line-cap": "round"
},
"paint": {
"line-color": "#888",
"line-width": 3,
"line-dasharray": [0.1, 1.8]
}
});
});
})
map.on('click', 'markers', (e) => {
obs = [e.lngLat.lng, e.lngLat.lat]
});body {
margin: 0;
padding: 0;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
.marker {
display: block;
border: none;
border-radius: 50%;
cursor: pointer;
padding: 0;
background-color: rgba(5, 4, 244, 0.82);
height: 10px;
width: 10px
}<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title></title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.40.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.40.1/mapbox-gl.css' rel='stylesheet' />
</head>
<body>
<div id='map'></div>
</body>
</html>
P.S：瀏覽器控制檯提供以下內容：錯誤：已有一個具有此ID的源 –