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use first point as centers while clustering, use weighted centers on display

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This commit is contained in:
Vladimir Agafonkin
2012-08-13 10:13:40 +12:00
committed by danzel
parent 585ac5be60
commit f3fddb835d
1 changed files with 12 additions and 7 deletions
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src/MarkerCluster.js
+12 -7
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@@ -42,6 +42,7 @@ L.MarkerCluster = L.Marker.extend({
},
_baseInit: function () {
this._latlng = this._wLatLng;
L.Marker.prototype.initialize.call(this, this._latlng, { icon: this._group.options.iconCreateFunction(this._childCount) });
},
@@ -64,25 +65,29 @@ L.MarkerCluster = L.Marker.extend({
_expandBounds: function (marker) {
var addedCount,
addedLatLng;
addedLatLng = marker._latlng;
if (marker instanceof L.MarkerCluster) {
this._bounds.extend(marker._bounds);
addedCount = marker._childCount;
addedLatLng = marker._latlng;
} else {
addedLatLng = marker.getLatLng();
this._bounds.extend(addedLatLng);
addedCount = 1;
}
if (!this._latlng) {
// when clustering, take position of the first point as the cluster center
this._latlng = addedLatLng;
}
// when showing clusters, take weighted average of all points as cluster center
var totalCount = this._childCount + addedCount;
if (!this._latlng) {
this._latlng = new L.LatLng(addedLatLng.lat, addedLatLng.lng);
if (!this._wLatLng) {
this._wLatLng = new L.LatLng(addedLatLng.lat, addedLatLng.lng);
} else {
this._latlng.lat = (addedLatLng.lat * addedCount + this._latlng.lat * this._childCount) / totalCount;
this._latlng.lng = (addedLatLng.lng * addedCount + this._latlng.lng * this._childCount) / totalCount;
this._wLatLng.lat = (addedLatLng.lat * addedCount + this._wLatLng.lat * this._childCount) / totalCount;
this._wLatLng.lng = (addedLatLng.lng * addedCount + this._wLatLng.lng * this._childCount) / totalCount;
}
},