leaflet - 如何使用超集群
问题描述
我是地图盒的新手。我需要使用mapbox 的超集群项目才能在地图中绘制 600 万个 gps。我试图在 localhost 中使用演示,但我只得到一个空地图!?
这是我在index.html中的代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Supercluster Leaflet demo</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.js"></script>
<link rel="stylesheet" href="cluster.css" />
<style>
html, body, #map {
height: 100%;
margin: 0;
}
</style>
</head>
<body>
<div id="map"></div>
<script src="index.js"></script>
<script src="https://unpkg.com/supercluster@3.0.2/dist/supercluster.min.js">
var index = supercluster({
radius: 40,
maxZoom: 16
});
index.load(GeoObs.features);
index.getClusters([-180, -85, 180, 85], 2);
</script>
</body>
</html>
注意:GeoObs是我的geojson文件
怎么了 ?
解决方案
这里的 FWIW 是一个独立的示例,说明如何在没有 Web Worker 的情况下使用supercluster 。它也只是基于 repo 演示。
var map = L.map('map').setView([0, 0], 0);
// Empty Layer Group that will receive the clusters data on the fly.
var markers = L.geoJSON(null, {
pointToLayer: createClusterIcon
}).addTo(map);
// Update the displayed clusters after user pan / zoom.
map.on('moveend', update);
function update() {
if (!ready) return;
var bounds = map.getBounds();
var bbox = [bounds.getWest(), bounds.getSouth(), bounds.getEast(), bounds.getNorth()];
var zoom = map.getZoom();
var clusters = index.getClusters(bbox, zoom);
markers.clearLayers();
markers.addData(clusters);
}
// Zoom to expand the cluster clicked by user.
markers.on('click', function(e) {
var clusterId = e.layer.feature.properties.cluster_id;
var center = e.latlng;
var expansionZoom;
if (clusterId) {
expansionZoom = index.getClusterExpansionZoom(clusterId);
map.flyTo(center, expansionZoom);
}
});
// Retrieve Points data.
var placesUrl = 'https://cdn.rawgit.com/mapbox/supercluster/v4.0.1/test/fixtures/places.json';
var index;
var ready = false;
jQuery.getJSON(placesUrl, function(geojson) {
// Initialize the supercluster index.
index = supercluster({
radius: 60,
extent: 256,
maxZoom: 18
}).load(geojson.features); // Expects an array of Features.
ready = true;
update();
});
function createClusterIcon(feature, latlng) {
if (!feature.properties.cluster) return L.marker(latlng);
var count = feature.properties.point_count;
var size =
count < 100 ? 'small' :
count < 1000 ? 'medium' : 'large';
var icon = L.divIcon({
html: '<div><span>' + feature.properties.point_count_abbreviated + '</span></div>',
className: 'marker-cluster marker-cluster-' + size,
iconSize: L.point(40, 40)
});
return L.marker(latlng, {
icon: icon
});
}
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ==" crossorigin="" />
<link rel="stylesheet" href="https://cdn.rawgit.com/mapbox/supercluster/v4.0.1/demo/cluster.css" />
<script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet-src.js" integrity="sha512-IkGU/uDhB9u9F8k+2OsA6XXoowIhOuQL1NTgNZHY1nkURnqEGlDZq3GsfmdJdKFe1k1zOc6YU2K7qY+hF9AodA==" crossorigin=""></script>
<script src="https://unpkg.com/supercluster@4.0.1/dist/supercluster.js"></script>
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<div id="map" style="height: 180px"></div>
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