79c8afdba8
To have the same path (starting with `ol/`, without `.js`) as in the documentation. The support was added in the webpack config in #8928
75 lines
1.7 KiB
JavaScript
75 lines
1.7 KiB
JavaScript
import Feature from 'ol/Feature';
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import Map from 'ol/Map';
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import View from 'ol/View';
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import Point from 'ol/geom/Point';
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import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
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import {Cluster, OSM, Vector as VectorSource} from 'ol/source';
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import {Circle as CircleStyle, Fill, Stroke, Style, Text} from 'ol/style';
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const distance = document.getElementById('distance');
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const count = 20000;
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const features = new Array(count);
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const e = 4500000;
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for (let i = 0; i < count; ++i) {
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const coordinates = [2 * e * Math.random() - e, 2 * e * Math.random() - e];
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features[i] = new Feature(new Point(coordinates));
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}
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const source = new VectorSource({
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features: features
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});
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const clusterSource = new Cluster({
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distance: parseInt(distance.value, 10),
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source: source
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});
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const styleCache = {};
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const clusters = new VectorLayer({
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source: clusterSource,
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style: function(feature) {
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const size = feature.get('features').length;
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let style = styleCache[size];
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if (!style) {
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style = new Style({
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image: new CircleStyle({
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radius: 10,
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stroke: new Stroke({
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color: '#fff'
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}),
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fill: new Fill({
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color: '#3399CC'
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})
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}),
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text: new Text({
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text: size.toString(),
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fill: new Fill({
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color: '#fff'
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})
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})
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});
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styleCache[size] = style;
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}
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return style;
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}
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});
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const raster = new TileLayer({
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source: new OSM()
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});
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const map = new Map({
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layers: [raster, clusters],
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target: 'map',
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view: new View({
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center: [0, 0],
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zoom: 2
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})
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});
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distance.addEventListener('input', function() {
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clusterSource.setDistance(parseInt(distance.value, 10));
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});
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