From 755180b753ce3d00ce5996d3b208231e6fd0e567 Mon Sep 17 00:00:00 2001
From: danzel <danzel@localhost.geek.nz>
Date: Thu, 2 Aug 2012 10:16:02 +1200
Subject: [PATCH] Add clearLayers implementation. Refs #26

---
 src/MarkerClusterGroup.js | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/MarkerClusterGroup.js b/src/MarkerClusterGroup.js
index 65ed7cbaa..417612ea2 100644
--- a/src/MarkerClusterGroup.js
+++ b/src/MarkerClusterGroup.js
@@ -63,6 +63,22 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 		return this;
 	},
 
+	clearLayers: function () {
+		//Need our own special implementation as the LayerGroup one doesn't work for us
+
+		//Remove all the visible layers
+		for (var i in this._layers) {
+			if (this._layers.hasOwnProperty(i)) {
+				L.FeatureGroup.prototype.removeLayer.call(this, this._layers[i]);
+			}
+		}
+
+		//Reset _topClusterLevel
+		this._generateInitialClusters();
+
+		return this;
+	},
+
 	//Overrides FeatureGroup.onAdd
 	onAdd: function (map) {
 		L.FeatureGroup.prototype.onAdd.call(this, map);
@@ -70,6 +86,7 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 		if (!this._topClusterLevel) {
 			this._generateInitialClusters();
 		}
+
 		this._map.on('zoomend', this._zoomEnd, this);
 		this._map.on('moveend', this._moveEnd, this);
 
@@ -199,6 +216,7 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 			currentZoom = this._map.getZoom();
 
 		this._topClusterLevel = this._clusterToMarkerCluster(this._needsClustering, maxZoom);
+		this._needsClustering = [];
 
 		//Generate to the top
 		while (minZoom < this._topClusterLevel._zoom) {