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osm openlayers cluster add feature proble example
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="chrome=1"> | |
| <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width"> | |
| <style> | |
| html, body, .map { height: 100%; width: 100%; }; | |
| </style> | |
| <link href="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/css/ol.css" rel='stylesheet' type='text/css' /> | |
| </head> | |
| <body> | |
| <div id="map" class="map"></div> | |
| <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js" type="text/javascript"></script> | |
| <script src="index.js" type="text/javascript"></script> | |
| </body> | |
| </html> |
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| var source = new ol.source.Vector({}); | |
| var clusterSource = new ol.source.Cluster({ | |
| distance: 40, | |
| source: source | |
| }); | |
| var styleCache = {}; | |
| var clusters = new ol.layer.Vector({ | |
| source: clusterSource, | |
| style: function(feature, resolution) { | |
| var size = feature.get('features').length; | |
| var style = styleCache[size]; | |
| if (!style) { | |
| style = [new ol.style.Style({ | |
| image: new ol.style.Circle({ | |
| radius: 10, | |
| stroke: new ol.style.Stroke({ | |
| color: '#fff' | |
| }), | |
| fill: new ol.style.Fill({ | |
| color: '#3399CC' | |
| }) | |
| }), | |
| text: new ol.style.Text({ | |
| text: size.toString(), | |
| fill: new ol.style.Fill({ | |
| color: '#fff' | |
| }) | |
| }) | |
| })]; | |
| styleCache[size] = style; | |
| } | |
| return style; | |
| } | |
| }); | |
| var map = new ol.Map({ | |
| layers: [clusters], | |
| renderer: 'canvas', | |
| target: 'map', | |
| view: new ol.View({ | |
| center: [0, 0], | |
| zoom: 2 | |
| }) | |
| }); | |
| var e = 4500000; | |
| function addFeature() { | |
| var coordinates = [2 * e * Math.random() - e, 2 * e * Math.random() - e]; | |
| var feature = new ol.Feature(new ol.geom.Point(coordinates)); | |
| source.addFeature(feature); | |
| } | |
| function removeFeature() { | |
| var feats = source.getFeatures(); | |
| if (feats.length) { | |
| var f = feats[Math.floor(Math.random() * feats.length)]; | |
| source.removeFeature(f); | |
| } | |
| } | |
| function clearFeatures() { | |
| source.clear(); | |
| } | |
| window.setInterval(addFeature, 500); | |
| window.setInterval(removeFeature, 1000); | |
| window.setInterval(clearFeatures, 10000) |
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