82 lines
2.0 KiB
JavaScript
82 lines
2.0 KiB
JavaScript
import Feature from '../src/ol/Feature.js';
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import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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import Point from '../src/ol/geom/Point.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import VectorLayer from '../src/ol/layer/Vector.js';
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import Cluster from '../src/ol/source/Cluster.js';
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import OSM from '../src/ol/source/OSM.js';
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import VectorSource from '../src/ol/source/Vector.js';
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import _ol_style_Circle_ from '../src/ol/style/Circle.js';
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import Fill from '../src/ol/style/Fill.js';
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import Stroke from '../src/ol/style/Stroke.js';
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import Style from '../src/ol/style/Style.js';
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import Text from '../src/ol/style/Text.js';
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var distance = document.getElementById('distance');
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var count = 20000;
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var features = new Array(count);
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var e = 4500000;
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for (var i = 0; i < count; ++i) {
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var 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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var source = new VectorSource({
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features: features
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});
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var 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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var styleCache = {};
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var clusters = new VectorLayer({
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source: clusterSource,
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style: function(feature) {
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var size = feature.get('features').length;
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var style = styleCache[size];
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if (!style) {
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style = new Style({
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image: new _ol_style_Circle_({
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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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var raster = new TileLayer({
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source: new OSM()
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});
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var 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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