mirror of
https://github.com/Leaflet/Leaflet.git
synced 2025-12-08 21:26:14 +00:00
75 lines
1.9 KiB
HTML
75 lines
1.9 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Leaflet debug page - Event Perf 2</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0" />
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<link rel="stylesheet" href="../../dist/leaflet.css" />
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<link rel="stylesheet" href="../css/screen.css" />
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<script type="importmap">
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{
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"imports": {
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"leaflet": "../../dist/leaflet-src.js"
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}
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}
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</script>
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</head>
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<body>
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<div id="map"></div>
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<script type="module">
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import {Map, TileLayer, FeatureGroup, LatLng, Marker} from 'leaflet';
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/*
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* Can be used to profile performance of event system.
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* Start the test, start CPU profiler. Slowly move the
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* mouse around over the map for 20 seconds or so, stop
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* profiler and examine times for _on, _off and fire.
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*/
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const map = new Map('map').setView([50.5, 30.51], 15);
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new TileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {maxZoom: 18}).addTo(map);
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const markers = new FeatureGroup().addTo(map);
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const markerArr = [];
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function getRandomLatLng(llbounds) {
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const s = llbounds.getSouth();
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const n = llbounds.getNorth();
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const w = llbounds.getWest();
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const e = llbounds.getEast();
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return new LatLng(
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s + Math.random() * (n - s),
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w + Math.random() * (e - w)
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);
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}
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function shuffleMarkers() {
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let marker;
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if (markerArr.length > 2000) {
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const i = Math.floor(Math.random() * markerArr.length);
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marker = markerArr.splice(i, 1)[0];
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markers.removeLayer(marker);
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} else {
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marker = new Marker(getRandomLatLng(map.getBounds()))
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.on('pointerover', () => {
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marker.setZIndexOffset(10000);
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})
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.on('pointerout', () => {
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marker.setZIndexOffset(0);
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})
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.addTo(markers);
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markerArr.push(marker);
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}
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}
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while (markerArr.length < 2000) {
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shuffleMarkers();
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}
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setInterval(shuffleMarkers, 20);
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</script>
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</body>
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</html>
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