Create and style clusters | Mapbox GL JS (original) (raw)
<!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">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.12.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.12.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map',
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/dark-v11',
center: [-103.5917, 40.6699],
zoom: 3
});
map.on('load', () => {
// 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: 'https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson',
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/style-spec/reference/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': ['get', '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', (e) => {
const features = map.queryRenderedFeatures(e.point, {
layers: ['clusters']
});
const clusterId = features[0].properties.cluster_id;
map.getSource('earthquakes').getClusterExpansionZoom(
clusterId,
(err, zoom) => {
if (err) return;
map.easeTo({
center: features[0].geometry.coordinates,
zoom: zoom
});
}
);
});
// When a click event occurs on a feature in
// the unclustered-point layer, open a popup at
// the location of the feature, with
// description HTML from its properties.
map.on('click', 'unclustered-point', (e) => {
const coordinates = e.features[0].geometry.coordinates.slice();
const mag = e.features[0].properties.mag;
const tsunami =
e.features[0].properties.tsunami === 1 ? 'yes' : 'no';
// Ensure that if the map is zoomed out such that
// multiple copies of the feature are visible, the
// popup appears over the copy being pointed to.
if (['mercator', 'equirectangular'].includes(map.getProjection().name)) {
while (Math.abs(e.lngLat.lng - coordinates[0]) > 180) {
coordinates[0] += e.lngLat.lng > coordinates[0] ? 360 : -360;
}
}
new mapboxgl.Popup()
.setLngLat(coordinates)
.setHTML(
`magnitude: <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mrow><mi>m</mi><mi>a</mi><mi>g</mi></mrow><mo><</mo><mi>b</mi><mi>r</mi><mo>></mo><mi>W</mi><mi>a</mi><mi>s</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>r</mi><mi>e</mi><mi>a</mi><mi>t</mi><mi>s</mi><mi>u</mi><mi>n</mi><mi>a</mi><mi>m</mi><mi>i</mi><mo stretchy="false">?</mo><mo>:</mo></mrow><annotation encoding="application/x-tex">{mag}<br>Was there a tsunami?: </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7335em;vertical-align:-0.1944em;"></span><span class="mord"><span class="mord mathnormal">ma</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span></span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel"><</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.7335em;vertical-align:-0.0391em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">></span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">Wa</span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal">ere</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">s</span><span class="mord mathnormal">u</span><span class="mord mathnormal">nami</span><span class="mclose">?</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">:</span></span></span></span>{tsunami}`
)
.addTo(map);
});
map.on('mouseenter', 'clusters', () => {
map.getCanvas().style.cursor = 'pointer';
});
map.on('mouseleave', 'clusters', () => {
map.getCanvas().style.cursor = '';
});
});
</script>
</body>
</html>