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<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>Create and style clusters</title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>
​
​
<div id='map'></div>
​
<script>
​
var EARTHQUAKES =
{
};
​
mapboxgl.accessToken = 'pk.eyJ1IjoiY2hlbnl1eWkiLCJhIjoiY2l1ZWoxemx6MDAweTJ5cHI3NHNnajR2NiJ9.cNpWK-0HoYbcumuQ8yvbjQ';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/dark-v10',
    center: [-103.59179687498357, 40.66995747013945],
    zoom: 3
});
​
map.on('load', function() {
    // Add a new source from our GeoJSON data and set the
    // 'cluster' option to true. GL-JS will add the point_count property to your source data.
    map.addSource("earthquakes", {
        type: "geojson",
        // Point to GeoJSON data. This example visualizes all M1.0+ earthquakes
        // from 12/22/15 to 1/21/16 as logged by USGS' Earthquake hazards program.
        data: EARTHQUAKES, // 將原例的此處資料挪到前面定義
        cluster: true,
        clusterMaxZoom: 14, // Max zoom to cluster points on
        clusterRadius: 50 // Radius of each cluster when clustering points (defaults to 50)
    });
​
    map.addLayer({
        id: "clusters",
        type: "circle",
        source: "earthquakes",
        filter: ["has", "point_count"],
        paint: {
            // Use step expressions (https://docs.mapbox.com/mapbox-gl-js/style-spec/#expressions-step)
            // with three steps to implement three types of circles:
            //   * Blue, 20px circles when point count is less than 100
            //   * Yellow, 30px circles when point count is between 100 and 750
            //   * Pink, 40px circles when point count is greater than or equal to 750
            "circle-color": [
                "step",
                ["get", "point_count"],
                "#51bbd6",
                100,
                "#f1f075",
                750,
                "#f28cb1"
            ],
            "circle-radius": [
                "step",
                ["get", "point_count"],
                20,
                100,
                30,
                750,
                40
            ]
        }
    });
​
    map.addLayer({
        id: "cluster-count",
        type: "symbol",
        source: "earthquakes",
        filter: ["has", "point_count"],
        layout: {
            "text-field": "{point_count_abbreviated}",
            "text-font": ["DIN Offc Pro Medium", "Arial Unicode MS Bold"],
            "text-size": 12
        }
    });
​
    map.addLayer({
        id: "unclustered-point",
        type: "circle",
        source: "earthquakes",
        filter: ["!", ["has", "point_count"]],
        paint: {
            "circle-color": "#11b4da",
            "circle-radius": 4,
            "circle-stroke-width": 1,
            "circle-stroke-color": "#fff"
        }
    });
​
    // inspect a cluster on click
    map.on('click', 'clusters', function (e) {
        var features = map.queryRenderedFeatures(e.point, { layers: ['clusters'] });
        var clusterId = features[0].properties.cluster_id;
        map.getSource('earthquakes').getClusterExpansionZoom(clusterId, function (err, zoom) {
            if (err)
                return;
​
            map.easeTo({
                center: features[0].geometry.coordinates,
                zoom: zoom
            });
        });
    });
​
    map.on('mouseenter', 'clusters', function () {
        map.getCanvas().style.cursor = 'pointer';
    });
    map.on('mouseleave', 'clusters', function () {
        map.getCanvas().style.cursor = '';
    });
});
</script>
​
</body>
</html>
 
​
 
​
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