Starting on spidifier based on https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet (Thanks jawj!)

2026-07-28 08:02:41 +02:00 · 2012-07-23 15:44:26 +12:00
parent 6e81c385e1
commit 45d9f8f841
2 changed files with 156 additions and 0 deletions
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+<!DOCTYPE html>
+<html>
+<head>
+	<title>Leaflet debug page</title>
+
+	<link rel="stylesheet" href="../lib/leaflet-dist/leaflet.css" />
+	<!--[if lte IE 8]><link rel="stylesheet" href="../lib/leaflet-dist/leaflet.ie.css" /><![endif]-->
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<link rel="stylesheet" href="screen.css" />
+	<script src="../lib/leaflet-dist/leaflet-src.js"></script>
+
+
+	<link rel="stylesheet" href="../src/MarkerCluster.css" />
+	<link rel="stylesheet" href="../src/MarkerCluster.Default.css" />
+	<script src="../src/MarkerClusterGroup.js"></script>
+	<script src="../src/MarkerCluster.js"></script>
+	<script src="../src/MarkerCluster.Spiderfier.js"></script>
+</head>
+<body>
+
+	<div id="map"></div>
+	<button id="populate">Populate 1 marker</button>
+	<button id="remove">Remove 1 marker</button>
+
+	<script type="text/javascript">
+
+		var cloudmadeUrl = 'http://{s}.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/997/256/{z}/{x}/{y}.png',
+			cloudmadeAttribution = 'Map data &copy; 2011 OpenStreetMap contributors, Imagery &copy; 2011 CloudMade',
+			cloudmade = new L.TileLayer(cloudmadeUrl, {maxZoom: 18, attribution: cloudmadeAttribution}),
+			latlng = new L.LatLng(50.5, 30.51);
+
+		var map = new L.Map('map', {center: latlng, zoom: 15, layers: [cloudmade]});
+
+		var markers = new L.MarkerClusterGroup();
+
+		function populate() {
+			for (var i = 0; i < 100; i++) {
+				var m = new L.Marker(getRandomLatLng(map));
+				markers.addLayer(m);
+			}
+			return false;
+		}
+		function getRandomLatLng(map) {
+			var bounds = map.getBounds(),
+				southWest = bounds.getSouthWest(),
+				northEast = bounds.getNorthEast(),
+				lngSpan = northEast.lng - southWest.lng,
+				latSpan = northEast.lat - southWest.lat;
+
+			return new L.LatLng(
+					southWest.lat + latSpan * Math.random(),
+					southWest.lng + lngSpan * Math.random());
+		}
+
+		markers.on('click', function (a) {
+			if (a.layer instanceof L.MarkerCluster) {
+				console.log('cluster ' + a.layer.getAllChildMarkers().length);
+				a.layer.spiderfy();
+			} else {
+				console.log('marker ' + a.layer);
+			}
+		});
+
+		populate();
+		map.addLayer(markers);
+	</script>
+</body>
+</html>
@@ -0,0 +1,88 @@
+//This code is 100% based on https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet
+//Huge thanks to jawj for implementing it first to make my job easy :-)
+
+L.MarkerCluster.include({
+
+	_2PI: Math.PI * 2,
+	_circleFootSeparation: 25, //related to circumference of circle
+	_circleStartAngle: Math.PI / 6,
+
+	_spiralFootSeparation:  28, //related to size of spiral (experiment!)
+	_spiralLengthStart: 11,
+	_spiralLengthFactor: 5,
+
+	_circleSpiralSwitchover: 9, //show spiral instead of circle from this marker count upwards.
+								// 0 -> always spiral; Infinity -> always circle
+
+	spiderfy: function () {
+		var childMarkers = this.getAllChildMarkers(),
+			group = this._group,
+			map = group._map,
+			center = map.latLngToLayerPoint(this._latlng),
+			markerOffsets,
+			i, m;
+		//TODO Maybe: childMarkers order by distance to center
+
+		if (childMarkers.length >= this._circleSpiralSwitchover) {
+			markerOffsets = this._generatePointsSpiral(childMarkers.length, center);
+		} else {
+			center.y += 10; //Otherwise circles look wrong
+			markerOffsets = this._generatePointsCircle(childMarkers.length, center);
+		}
+
+		for (i = childMarkers.length - 1; i >= 0; i--) {
+			m = childMarkers[i];
+
+			m._backupPosSpider = m._latlng;
+			m.setLatLng(map.layerPointToLatLng(markerOffsets[i]));
+
+			m.setZIndexOffset(1000000); //Make these appear on top of EVERYTHING
+			L.FeatureGroup.prototype.addLayer.call(group, m);
+
+			var leg = new L.Polyline([this._latlng, m._latlng], { weight: 1.5, color: '#222' });
+			map.addLayer(leg);
+		}
+
+		this.setOpacity(0.3);
+	},
+
+	unspiderfy: function () {
+		if (false) {
+			return;
+		}
+		//TODO
+	},
+
+	_generatePointsCircle: function (count, centerPt) {
+		var circumference = this._circleFootSeparation * (2 + count),
+			legLength = circumference / this._2PI,  //radius from circumference
+			angleStep = this._2PI / count,
+			res = [],
+			i, angle;
+
+		res.length = count;
+
+		for (i = count - 1; i >= 0; i--) {
+			angle = this._circleStartAngle + i * angleStep;
+			res[i] = new L.Point(centerPt.x + legLength * Math.cos(angle), centerPt.y + legLength * Math.sin(angle));
+		}
+
+		return res;
+	},
+
+	_generatePointsSpiral: function (count, centerPt) {
+		var legLength = this._spiralLengthStart,
+			angle = 0,
+			res = [],
+			i;
+
+		res.length = count;
+
+		for (i = count - 1; i >= 0; i--) {
+			angle += this._spiralFootSeparation / legLength + i * 0.0005;
+			res[i] = new L.Point(centerPt.x + legLength * Math.cos(angle), centerPt.y + legLength * Math.sin(angle));
+			legLength += this._2PI * this._spiralLengthFactor / angle;
+		}
+		return res;
+	}
+});