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Diffstat (limited to 'admin/survey/script/Maps/markerclusterer.js')
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diff --git a/admin/survey/script/Maps/markerclusterer.js b/admin/survey/script/Maps/markerclusterer.js new file mode 100644 index 0000000..a27298c --- /dev/null +++ b/admin/survey/script/Maps/markerclusterer.js @@ -0,0 +1,1318 @@ +// ==ClosureCompiler==
+// @compilation_level ADVANCED_OPTIMIZATIONS
+// @externs_url http://closure-compiler.googlecode.com/svn/trunk/contrib/externs/maps/google_maps_api_v3_3.js
+// ==/ClosureCompiler==
+
+/**
+ * @name MarkerClusterer for Google Maps v3
+ * @version version 1.0.1
+ * @author Luke Mahe
+ * @fileoverview
+ * The library creates and manages per-zoom-level clusters for large amounts of
+ * markers.
+ * <br/>
+ * This is a v3 implementation of the
+ * <a href="http://gmaps-utility-library-dev.googlecode.com/svn/tags/markerclusterer/"
+ * >v2 MarkerClusterer</a>.
+ */
+
+/**
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+/**
+ * A Marker Clusterer that clusters markers.
+ *
+ * @param {google.maps.Map} map The Google map to attach to.
+ * @param {Array.<google.maps.Marker>=} opt_markers Optional markers to add to
+ * the cluster.
+ * @param {Object=} opt_options support the following options:
+ * 'gridSize': (number) The grid size of a cluster in pixels.
+ * 'maxZoom': (number) The maximum zoom level that a marker can be part of a
+ * cluster.
+ * 'zoomOnClick': (boolean) Whether the default behaviour of clicking on a
+ * cluster is to zoom into it.
+ * 'imagePath': (string) The base URL where the images representing
+ * clusters will be found. The full URL will be:
+ * {imagePath}[1-5].{imageExtension}
+ * Default: '../images/m'.
+ * 'imageExtension': (string) The suffix for images URL representing
+ * clusters will be found. See _imagePath_ for details.
+ * Default: 'png'.
+ * 'averageCenter': (boolean) Whether the center of each cluster should be
+ * the average of all markers in the cluster.
+ * 'minimumClusterSize': (number) The minimum number of markers to be in a
+ * cluster before the markers are hidden and a count
+ * is shown.
+ * 'styles': (object) An object that has style properties:
+ * 'url': (string) The image url.
+ * 'height': (number) The image height.
+ * 'width': (number) The image width.
+ * 'anchor': (Array) The anchor position of the label text.
+ * 'textColor': (string) The text color.
+ * 'textSize': (number) The text size.
+ * 'backgroundPosition': (string) The position of the backgound x, y.
+ * @constructor
+ * @extends google.maps.OverlayView
+ */
+function MarkerClusterer(map, opt_markers, opt_options) {
+ // MarkerClusterer implements google.maps.OverlayView interface. We use the
+ // extend function to extend MarkerClusterer with google.maps.OverlayView
+ // because it might not always be available when the code is defined so we
+ // look for it at the last possible moment. If it doesn't exist now then
+ // there is no point going ahead :)
+ this.extend(MarkerClusterer, google.maps.OverlayView);
+ this.map_ = map;
+
+ /**
+ * @type {Array.<google.maps.Marker>}
+ * @private
+ */
+ this.markers_ = [];
+
+ /**
+ * @type {Array.<Cluster>}
+ */
+ this.clusters_ = [];
+
+ this.sizes = [53, 56, 66, 78, 90];
+
+ /**
+ * @private
+ */
+ this.styles_ = [];
+
+ /**
+ * @type {boolean}
+ * @private
+ */
+ this.ready_ = false;
+
+ var options = opt_options || {};
+
+ /**
+ * @type {number}
+ * @private
+ */
+ this.gridSize_ = options['gridSize'] || 60;
+
+ /**
+ * @private
+ */
+ this.minClusterSize_ = options['minimumClusterSize'] || 2;
+
+
+ /**
+ * @type {?number}
+ * @private
+ */
+ this.maxZoom_ = options['maxZoom'] || null;
+
+ this.styles_ = options['styles'] || [];
+
+ /**
+ * @type {string}
+ * @private
+ */
+ this.imagePath_ = options['imagePath'] ||
+ this.MARKER_CLUSTER_IMAGE_PATH_;
+
+ /**
+ * @type {string}
+ * @private
+ */
+ this.imageExtension_ = options['imageExtension'] ||
+ this.MARKER_CLUSTER_IMAGE_EXTENSION_;
+
+ /**
+ * @type {boolean}
+ * @private
+ */
+ this.zoomOnClick_ = true;
+
+ if (options['zoomOnClick'] != undefined) {
+ this.zoomOnClick_ = options['zoomOnClick'];
+ }
+
+ /**
+ * @type {boolean}
+ * @private
+ */
+ this.averageCenter_ = false;
+
+ if (options['averageCenter'] != undefined) {
+ this.averageCenter_ = options['averageCenter'];
+ }
+
+ this.setupStyles_();
+
+ this.setMap(map);
+
+ /**
+ * @type {number}
+ * @private
+ */
+ this.prevZoom_ = this.map_.getZoom();
+
+ // Add the map event listeners
+ var that = this;
+ google.maps.event.addListener(this.map_, 'zoom_changed', function() {
+ // Determines map type and prevent illegal zoom levels
+ var zoom = that.map_.getZoom();
+ var minZoom = that.map_.minZoom || 0;
+ var maxZoom = Math.min(that.map_.maxZoom || 100,
+ that.map_.mapTypes[that.map_.getMapTypeId()].maxZoom);
+ zoom = Math.min(Math.max(zoom,minZoom),maxZoom);
+
+ if (that.prevZoom_ != zoom) {
+ that.prevZoom_ = zoom;
+ that.resetViewport();
+ }
+ });
+
+ google.maps.event.addListener(this.map_, 'idle', function() {
+ that.redraw();
+ });
+
+ // Finally, add the markers
+ if (opt_markers && (opt_markers.length || Object.keys(opt_markers).length)) {
+ this.addMarkers(opt_markers, false);
+ }
+}
+
+
+/**
+ * The marker cluster image path.
+ *
+ * @type {string}
+ * @private
+ */
+MarkerClusterer.prototype.MARKER_CLUSTER_IMAGE_PATH_ = '../images/m';
+
+
+/**
+ * The marker cluster image path.
+ *
+ * @type {string}
+ * @private
+ */
+MarkerClusterer.prototype.MARKER_CLUSTER_IMAGE_EXTENSION_ = 'png';
+
+
+/**
+ * Extends a objects prototype by anothers.
+ *
+ * @param {Object} obj1 The object to be extended.
+ * @param {Object} obj2 The object to extend with.
+ * @return {Object} The new extended object.
+ * @ignore
+ */
+MarkerClusterer.prototype.extend = function(obj1, obj2) {
+ return (function(object) {
+ for (var property in object.prototype) {
+ this.prototype[property] = object.prototype[property];
+ }
+ return this;
+ }).apply(obj1, [obj2]);
+};
+
+
+/**
+ * Implementaion of the interface method.
+ * @ignore
+ */
+MarkerClusterer.prototype.onAdd = function() {
+ this.setReady_(true);
+};
+
+/**
+ * Implementaion of the interface method.
+ * @ignore
+ */
+MarkerClusterer.prototype.draw = function() {};
+
+/**
+ * Sets up the styles object.
+ *
+ * @private
+ */
+MarkerClusterer.prototype.setupStyles_ = function() {
+ if (this.styles_.length) {
+ return;
+ }
+
+ for (var i = 0, size; size = this.sizes[i]; i++) {
+ this.styles_.push({
+ url: this.imagePath_ + (i + 1) + '.' + this.imageExtension_,
+ height: size,
+ width: size
+ });
+ }
+};
+
+/**
+ * Fit the map to the bounds of the markers in the clusterer.
+ */
+MarkerClusterer.prototype.fitMapToMarkers = function() {
+ var markers = this.getMarkers();
+ var bounds = new google.maps.LatLngBounds();
+ for (var i = 0, marker; marker = markers[i]; i++) {
+ bounds.extend(marker.getPosition());
+ }
+
+ this.map_.fitBounds(bounds);
+};
+
+
+/**
+ * Sets the styles.
+ *
+ * @param {Object} styles The style to set.
+ */
+MarkerClusterer.prototype.setStyles = function(styles) {
+ this.styles_ = styles;
+};
+
+
+/**
+ * Gets the styles.
+ *
+ * @return {Object} The styles object.
+ */
+MarkerClusterer.prototype.getStyles = function() {
+ return this.styles_;
+};
+
+
+/**
+ * Whether zoom on click is set.
+ *
+ * @return {boolean} True if zoomOnClick_ is set.
+ */
+MarkerClusterer.prototype.isZoomOnClick = function() {
+ return this.zoomOnClick_;
+};
+
+/**
+ * Whether average center is set.
+ *
+ * @return {boolean} True if averageCenter_ is set.
+ */
+MarkerClusterer.prototype.isAverageCenter = function() {
+ return this.averageCenter_;
+};
+
+
+/**
+ * Returns the array of markers in the clusterer.
+ *
+ * @return {Array.<google.maps.Marker>} The markers.
+ */
+MarkerClusterer.prototype.getMarkers = function() {
+ return this.markers_;
+};
+
+
+/**
+ * Returns the number of markers in the clusterer
+ *
+ * @return {Number} The number of markers.
+ */
+MarkerClusterer.prototype.getTotalMarkers = function() {
+ return this.markers_.length;
+};
+
+
+/**
+ * Sets the max zoom for the clusterer.
+ *
+ * @param {number} maxZoom The max zoom level.
+ */
+MarkerClusterer.prototype.setMaxZoom = function(maxZoom) {
+ this.maxZoom_ = maxZoom;
+};
+
+
+/**
+ * Gets the max zoom for the clusterer.
+ *
+ * @return {number} The max zoom level.
+ */
+MarkerClusterer.prototype.getMaxZoom = function() {
+ return this.maxZoom_;
+};
+
+
+/**
+ * The function for calculating the cluster icon image.
+ *
+ * @param {Array.<google.maps.Marker>} markers The markers in the clusterer.
+ * @param {number} numStyles The number of styles available.
+ * @return {Object} A object properties: 'text' (string) and 'index' (number).
+ * @private
+ */
+MarkerClusterer.prototype.calculator_ = function(markers, numStyles) {
+ var index = 0;
+ var count = markers.length;
+ var dv = count;
+ while (dv !== 0) {
+ dv = parseInt(dv / 10, 10);
+ index++;
+ }
+
+ index = Math.min(index, numStyles);
+ return {
+ text: count,
+ index: index
+ };
+};
+
+
+/**
+ * Set the calculator function.
+ *
+ * @param {function(Array, number)} calculator The function to set as the
+ * calculator. The function should return a object properties:
+ * 'text' (string) and 'index' (number).
+ *
+ */
+MarkerClusterer.prototype.setCalculator = function(calculator) {
+ this.calculator_ = calculator;
+};
+
+
+/**
+ * Get the calculator function.
+ *
+ * @return {function(Array, number)} the calculator function.
+ */
+MarkerClusterer.prototype.getCalculator = function() {
+ return this.calculator_;
+};
+
+
+/**
+ * Add an array of markers to the clusterer.
+ *
+ * @param {Array.<google.maps.Marker>} markers The markers to add.
+ * @param {boolean=} opt_nodraw Whether to redraw the clusters.
+ */
+MarkerClusterer.prototype.addMarkers = function(markers, opt_nodraw) {
+ if (markers.length) {
+ for (var i = 0, marker; marker = markers[i]; i++) {
+ this.pushMarkerTo_(marker);
+ }
+ } else if (Object.keys(markers).length) {
+ for (var marker in markers) {
+ this.pushMarkerTo_(markers[marker]);
+ }
+ }
+ if (!opt_nodraw) {
+ this.redraw();
+ }
+};
+
+
+/**
+ * Pushes a marker to the clusterer.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ * @private
+ */
+MarkerClusterer.prototype.pushMarkerTo_ = function(marker) {
+ marker.isAdded = false;
+ if (marker['draggable']) {
+ // If the marker is draggable add a listener so we update the clusters on
+ // the drag end.
+ var that = this;
+ google.maps.event.addListener(marker, 'dragend', function() {
+ marker.isAdded = false;
+ that.repaint();
+ });
+ }
+ this.markers_.push(marker);
+};
+
+
+/**
+ * Adds a marker to the clusterer and redraws if needed.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ * @param {boolean=} opt_nodraw Whether to redraw the clusters.
+ */
+MarkerClusterer.prototype.addMarker = function(marker, opt_nodraw) {
+ this.pushMarkerTo_(marker);
+ if (!opt_nodraw) {
+ this.redraw();
+ }
+};
+
+
+/**
+ * Removes a marker and returns true if removed, false if not
+ *
+ * @param {google.maps.Marker} marker The marker to remove
+ * @return {boolean} Whether the marker was removed or not
+ * @private
+ */
+MarkerClusterer.prototype.removeMarker_ = function(marker) {
+ var index = -1;
+ if (this.markers_.indexOf) {
+ index = this.markers_.indexOf(marker);
+ } else {
+ for (var i = 0, m; m = this.markers_[i]; i++) {
+ if (m == marker) {
+ index = i;
+ break;
+ }
+ }
+ }
+
+ if (index == -1) {
+ // Marker is not in our list of markers.
+ return false;
+ }
+
+ marker.setMap(null);
+
+ this.markers_.splice(index, 1);
+
+ return true;
+};
+
+
+/**
+ * Remove a marker from the cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to remove.
+ * @param {boolean=} opt_nodraw Optional boolean to force no redraw.
+ * @return {boolean} True if the marker was removed.
+ */
+MarkerClusterer.prototype.removeMarker = function(marker, opt_nodraw) {
+ var removed = this.removeMarker_(marker);
+
+ if (!opt_nodraw && removed) {
+ this.resetViewport();
+ this.redraw();
+ return true;
+ } else {
+ return false;
+ }
+};
+
+
+/**
+ * Removes an array of markers from the cluster.
+ *
+ * @param {Array.<google.maps.Marker>} markers The markers to remove.
+ * @param {boolean=} opt_nodraw Optional boolean to force no redraw.
+ */
+MarkerClusterer.prototype.removeMarkers = function(markers, opt_nodraw) {
+ // create a local copy of markers if required
+ // (removeMarker_ modifies the getMarkers() array in place)
+ var markersCopy = markers === this.getMarkers() ? markers.slice() : markers;
+ var removed = false;
+
+ for (var i = 0, marker; marker = markersCopy[i]; i++) {
+ var r = this.removeMarker_(marker);
+ removed = removed || r;
+ }
+
+ if (!opt_nodraw && removed) {
+ this.resetViewport();
+ this.redraw();
+ return true;
+ }
+};
+
+
+/**
+ * Sets the clusterer's ready state.
+ *
+ * @param {boolean} ready The state.
+ * @private
+ */
+MarkerClusterer.prototype.setReady_ = function(ready) {
+ if (!this.ready_) {
+ this.ready_ = ready;
+ this.createClusters_();
+ }
+};
+
+
+/**
+ * Returns the number of clusters in the clusterer.
+ *
+ * @return {number} The number of clusters.
+ */
+MarkerClusterer.prototype.getTotalClusters = function() {
+ return this.clusters_.length;
+};
+
+
+/**
+ * Returns the google map that the clusterer is associated with.
+ *
+ * @return {google.maps.Map} The map.
+ */
+MarkerClusterer.prototype.getMap = function() {
+ return this.map_;
+};
+
+
+/**
+ * Sets the google map that the clusterer is associated with.
+ *
+ * @param {google.maps.Map} map The map.
+ */
+MarkerClusterer.prototype.setMap = function(map) {
+ this.map_ = map;
+};
+
+
+/**
+ * Returns the size of the grid.
+ *
+ * @return {number} The grid size.
+ */
+MarkerClusterer.prototype.getGridSize = function() {
+ return this.gridSize_;
+};
+
+
+/**
+ * Sets the size of the grid.
+ *
+ * @param {number} size The grid size.
+ */
+MarkerClusterer.prototype.setGridSize = function(size) {
+ this.gridSize_ = size;
+};
+
+
+/**
+ * Returns the min cluster size.
+ *
+ * @return {number} The grid size.
+ */
+MarkerClusterer.prototype.getMinClusterSize = function() {
+ return this.minClusterSize_;
+};
+
+/**
+ * Sets the min cluster size.
+ *
+ * @param {number} size The grid size.
+ */
+MarkerClusterer.prototype.setMinClusterSize = function(size) {
+ this.minClusterSize_ = size;
+};
+
+
+/**
+ * Extends a bounds object by the grid size.
+ *
+ * @param {google.maps.LatLngBounds} bounds The bounds to extend.
+ * @return {google.maps.LatLngBounds} The extended bounds.
+ */
+MarkerClusterer.prototype.getExtendedBounds = function(bounds) {
+ var projection = this.getProjection();
+
+ // Turn the bounds into latlng.
+ var tr = new google.maps.LatLng(bounds.getNorthEast().lat(),
+ bounds.getNorthEast().lng());
+ var bl = new google.maps.LatLng(bounds.getSouthWest().lat(),
+ bounds.getSouthWest().lng());
+
+ // Convert the points to pixels and the extend out by the grid size.
+ var trPix = projection.fromLatLngToDivPixel(tr);
+ trPix.x += this.gridSize_;
+ trPix.y -= this.gridSize_;
+
+ var blPix = projection.fromLatLngToDivPixel(bl);
+ blPix.x -= this.gridSize_;
+ blPix.y += this.gridSize_;
+
+ // Convert the pixel points back to LatLng
+ var ne = projection.fromDivPixelToLatLng(trPix);
+ var sw = projection.fromDivPixelToLatLng(blPix);
+
+ // Extend the bounds to contain the new bounds.
+ bounds.extend(ne);
+ bounds.extend(sw);
+
+ return bounds;
+};
+
+
+/**
+ * Determins if a marker is contained in a bounds.
+ *
+ * @param {google.maps.Marker} marker The marker to check.
+ * @param {google.maps.LatLngBounds} bounds The bounds to check against.
+ * @return {boolean} True if the marker is in the bounds.
+ * @private
+ */
+MarkerClusterer.prototype.isMarkerInBounds_ = function(marker, bounds) {
+ return bounds.contains(marker.getPosition());
+};
+
+
+/**
+ * Clears all clusters and markers from the clusterer.
+ */
+MarkerClusterer.prototype.clearMarkers = function() {
+ this.resetViewport(true);
+
+ // Set the markers a empty array.
+ this.markers_ = [];
+};
+
+
+/**
+ * Clears all existing clusters and recreates them.
+ * @param {boolean} opt_hide To also hide the marker.
+ */
+MarkerClusterer.prototype.resetViewport = function(opt_hide) {
+ // Remove all the clusters
+ for (var i = 0, cluster; cluster = this.clusters_[i]; i++) {
+ cluster.remove();
+ }
+
+ // Reset the markers to not be added and to be invisible.
+ for (var i = 0, marker; marker = this.markers_[i]; i++) {
+ marker.isAdded = false;
+ if (opt_hide) {
+ marker.setMap(null);
+ }
+ }
+
+ this.clusters_ = [];
+};
+
+/**
+ *
+ */
+MarkerClusterer.prototype.repaint = function() {
+ var oldClusters = this.clusters_.slice();
+ this.clusters_.length = 0;
+ this.resetViewport();
+ this.redraw();
+
+ // Remove the old clusters.
+ // Do it in a timeout so the other clusters have been drawn first.
+ window.setTimeout(function() {
+ for (var i = 0, cluster; cluster = oldClusters[i]; i++) {
+ cluster.remove();
+ }
+ }, 0);
+};
+
+
+/**
+ * Redraws the clusters.
+ */
+MarkerClusterer.prototype.redraw = function() {
+ this.createClusters_();
+};
+
+
+/**
+ * Calculates the distance between two latlng locations in km.
+ * @see http://www.movable-type.co.uk/scripts/latlong.html
+ *
+ * @param {google.maps.LatLng} p1 The first lat lng point.
+ * @param {google.maps.LatLng} p2 The second lat lng point.
+ * @return {number} The distance between the two points in km.
+ * @private
+*/
+MarkerClusterer.prototype.distanceBetweenPoints_ = function(p1, p2) {
+ if (!p1 || !p2) {
+ return 0;
+ }
+
+ var R = 6371; // Radius of the Earth in km
+ var dLat = (p2.lat() - p1.lat()) * Math.PI / 180;
+ var dLon = (p2.lng() - p1.lng()) * Math.PI / 180;
+ var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+ Math.cos(p1.lat() * Math.PI / 180) * Math.cos(p2.lat() * Math.PI / 180) *
+ Math.sin(dLon / 2) * Math.sin(dLon / 2);
+ var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+ var d = R * c;
+ return d;
+};
+
+
+/**
+ * Add a marker to a cluster, or creates a new cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ * @private
+ */
+MarkerClusterer.prototype.addToClosestCluster_ = function(marker) {
+ var distance = 40000; // Some large number
+ var clusterToAddTo = null;
+ var pos = marker.getPosition();
+ for (var i = 0, cluster; cluster = this.clusters_[i]; i++) {
+ var center = cluster.getCenter();
+ if (center) {
+ var d = this.distanceBetweenPoints_(center, marker.getPosition());
+ if (d < distance) {
+ distance = d;
+ clusterToAddTo = cluster;
+ }
+ }
+ }
+
+ if (clusterToAddTo && clusterToAddTo.isMarkerInClusterBounds(marker)) {
+ clusterToAddTo.addMarker(marker);
+ } else {
+ var cluster = new Cluster(this);
+ cluster.addMarker(marker);
+ this.clusters_.push(cluster);
+ }
+};
+
+
+/**
+ * Creates the clusters.
+ *
+ * @private
+ */
+MarkerClusterer.prototype.createClusters_ = function() {
+ if (!this.ready_) {
+ return;
+ }
+
+ // Get our current map view bounds.
+ // Create a new bounds object so we don't affect the map.
+ var mapBounds = new google.maps.LatLngBounds(this.map_.getBounds().getSouthWest(),
+ this.map_.getBounds().getNorthEast());
+ var bounds = this.getExtendedBounds(mapBounds);
+
+ for (var i = 0, marker; marker = this.markers_[i]; i++) {
+ if (!marker.isAdded && this.isMarkerInBounds_(marker, bounds)) {
+ this.addToClosestCluster_(marker);
+ }
+ }
+};
+
+
+/**
+ * A cluster that contains markers.
+ *
+ * @param {MarkerClusterer} markerClusterer The markerclusterer that this
+ * cluster is associated with.
+ * @constructor
+ * @ignore
+ */
+function Cluster(markerClusterer) {
+ this.markerClusterer_ = markerClusterer;
+ this.map_ = markerClusterer.getMap();
+ this.gridSize_ = markerClusterer.getGridSize();
+ this.minClusterSize_ = markerClusterer.getMinClusterSize();
+ this.averageCenter_ = markerClusterer.isAverageCenter();
+ this.center_ = null;
+ this.markers_ = [];
+ this.bounds_ = null;
+ this.clusterIcon_ = new ClusterIcon(this, markerClusterer.getStyles(),
+ markerClusterer.getGridSize());
+}
+
+/**
+ * Determins if a marker is already added to the cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to check.
+ * @return {boolean} True if the marker is already added.
+ */
+Cluster.prototype.isMarkerAlreadyAdded = function(marker) {
+ if (this.markers_.indexOf) {
+ return this.markers_.indexOf(marker) != -1;
+ } else {
+ for (var i = 0, m; m = this.markers_[i]; i++) {
+ if (m == marker) {
+ return true;
+ }
+ }
+ }
+ return false;
+};
+
+
+/**
+ * Add a marker the cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ * @return {boolean} True if the marker was added.
+ */
+Cluster.prototype.addMarker = function(marker) {
+ if (this.isMarkerAlreadyAdded(marker)) {
+ return false;
+ }
+
+ if (!this.center_) {
+ this.center_ = marker.getPosition();
+ this.calculateBounds_();
+ } else {
+ if (this.averageCenter_) {
+ var l = this.markers_.length + 1;
+ var lat = (this.center_.lat() * (l-1) + marker.getPosition().lat()) / l;
+ var lng = (this.center_.lng() * (l-1) + marker.getPosition().lng()) / l;
+ this.center_ = new google.maps.LatLng(lat, lng);
+ this.calculateBounds_();
+ }
+ }
+
+ marker.isAdded = true;
+ this.markers_.push(marker);
+
+ var len = this.markers_.length;
+ if (len < this.minClusterSize_ && marker.getMap() != this.map_) {
+ // Min cluster size not reached so show the marker.
+ marker.setMap(this.map_);
+ }
+
+ if (len == this.minClusterSize_) {
+ // Hide the markers that were showing.
+ for (var i = 0; i < len; i++) {
+ this.markers_[i].setMap(null);
+ }
+ }
+
+ if (len >= this.minClusterSize_) {
+ marker.setMap(null);
+ }
+
+ this.updateIcon();
+ return true;
+};
+
+
+/**
+ * Returns the marker clusterer that the cluster is associated with.
+ *
+ * @return {MarkerClusterer} The associated marker clusterer.
+ */
+Cluster.prototype.getMarkerClusterer = function() {
+ return this.markerClusterer_;
+};
+
+
+/**
+ * Returns the bounds of the cluster.
+ *
+ * @return {google.maps.LatLngBounds} the cluster bounds.
+ */
+Cluster.prototype.getBounds = function() {
+ var bounds = new google.maps.LatLngBounds(this.center_, this.center_);
+ var markers = this.getMarkers();
+ for (var i = 0, marker; marker = markers[i]; i++) {
+ bounds.extend(marker.getPosition());
+ }
+ return bounds;
+};
+
+
+/**
+ * Removes the cluster
+ */
+Cluster.prototype.remove = function() {
+ this.clusterIcon_.remove();
+ this.markers_.length = 0;
+ delete this.markers_;
+};
+
+
+/**
+ * Returns the number of markers in the cluster.
+ *
+ * @return {number} The number of markers in the cluster.
+ */
+Cluster.prototype.getSize = function() {
+ return this.markers_.length;
+};
+
+
+/**
+ * Returns a list of the markers in the cluster.
+ *
+ * @return {Array.<google.maps.Marker>} The markers in the cluster.
+ */
+Cluster.prototype.getMarkers = function() {
+ return this.markers_;
+};
+
+
+/**
+ * Returns the center of the cluster.
+ *
+ * @return {google.maps.LatLng} The cluster center.
+ */
+Cluster.prototype.getCenter = function() {
+ return this.center_;
+};
+
+
+/**
+ * Calculated the extended bounds of the cluster with the grid.
+ *
+ * @private
+ */
+Cluster.prototype.calculateBounds_ = function() {
+ var bounds = new google.maps.LatLngBounds(this.center_, this.center_);
+ this.bounds_ = this.markerClusterer_.getExtendedBounds(bounds);
+};
+
+
+/**
+ * Determines if a marker lies in the clusters bounds.
+ *
+ * @param {google.maps.Marker} marker The marker to check.
+ * @return {boolean} True if the marker lies in the bounds.
+ */
+Cluster.prototype.isMarkerInClusterBounds = function(marker) {
+ return this.bounds_.contains(marker.getPosition());
+};
+
+
+/**
+ * Returns the map that the cluster is associated with.
+ *
+ * @return {google.maps.Map} The map.
+ */
+Cluster.prototype.getMap = function() {
+ return this.map_;
+};
+
+
+/**
+ * Updates the cluster icon
+ */
+Cluster.prototype.updateIcon = function() {
+ var zoom = this.map_.getZoom();
+ var mz = this.markerClusterer_.getMaxZoom();
+
+ if (mz && zoom > mz) {
+ // The zoom is greater than our max zoom so show all the markers in cluster.
+ for (var i = 0, marker; marker = this.markers_[i]; i++) {
+ marker.setMap(this.map_);
+ }
+ return;
+ }
+
+ if (this.markers_.length < this.minClusterSize_) {
+ // Min cluster size not yet reached.
+ this.clusterIcon_.hide();
+ return;
+ }
+
+ var numStyles = this.markerClusterer_.getStyles().length;
+ var sums = this.markerClusterer_.getCalculator()(this.markers_, numStyles);
+ this.clusterIcon_.setCenter(this.center_);
+ this.clusterIcon_.setSums(sums);
+ this.clusterIcon_.show();
+};
+
+
+/**
+ * A cluster icon
+ *
+ * @param {Cluster} cluster The cluster to be associated with.
+ * @param {Object} styles An object that has style properties:
+ * 'url': (string) The image url.
+ * 'height': (number) The image height.
+ * 'width': (number) The image width.
+ * 'anchor': (Array) The anchor position of the label text.
+ * 'textColor': (string) The text color.
+ * 'textSize': (number) The text size.
+ * 'backgroundPosition: (string) The background postition x, y.
+ * @param {number=} opt_padding Optional padding to apply to the cluster icon.
+ * @constructor
+ * @extends google.maps.OverlayView
+ * @ignore
+ */
+function ClusterIcon(cluster, styles, opt_padding) {
+ cluster.getMarkerClusterer().extend(ClusterIcon, google.maps.OverlayView);
+
+ this.styles_ = styles;
+ this.padding_ = opt_padding || 0;
+ this.cluster_ = cluster;
+ this.center_ = null;
+ this.map_ = cluster.getMap();
+ this.div_ = null;
+ this.sums_ = null;
+ this.visible_ = false;
+
+ this.setMap(this.map_);
+}
+
+
+/**
+ * Triggers the clusterclick event and zoom's if the option is set.
+ */
+ClusterIcon.prototype.triggerClusterClick = function() {
+ var markerClusterer = this.cluster_.getMarkerClusterer();
+
+ // Trigger the clusterclick event.
+ google.maps.event.trigger(markerClusterer, 'clusterclick', this.cluster_);
+
+ if (markerClusterer.isZoomOnClick()) {
+ // Zoom into the cluster.
+ this.map_.fitBounds(this.cluster_.getBounds());
+ }
+};
+
+
+/**
+ * Adding the cluster icon to the dom.
+ * @ignore
+ */
+ClusterIcon.prototype.onAdd = function() {
+ this.div_ = document.createElement('DIV');
+ if (this.visible_) {
+ var pos = this.getPosFromLatLng_(this.center_);
+ this.div_.style.cssText = this.createCss(pos);
+ this.div_.innerHTML = this.sums_.text;
+ }
+
+ var panes = this.getPanes();
+ panes.overlayMouseTarget.appendChild(this.div_);
+
+ var that = this;
+ google.maps.event.addDomListener(this.div_, 'click', function() {
+ that.triggerClusterClick();
+ });
+};
+
+
+/**
+ * Returns the position to place the div dending on the latlng.
+ *
+ * @param {google.maps.LatLng} latlng The position in latlng.
+ * @return {google.maps.Point} The position in pixels.
+ * @private
+ */
+ClusterIcon.prototype.getPosFromLatLng_ = function(latlng) {
+ var pos = this.getProjection().fromLatLngToDivPixel(latlng);
+ pos.x -= parseInt(this.width_ / 2, 10);
+ pos.y -= parseInt(this.height_ / 2, 10);
+ return pos;
+};
+
+
+/**
+ * Draw the icon.
+ * @ignore
+ */
+ClusterIcon.prototype.draw = function() {
+ if (this.visible_) {
+ var pos = this.getPosFromLatLng_(this.center_);
+ this.div_.style.top = pos.y + 'px';
+ this.div_.style.left = pos.x + 'px';
+ }
+};
+
+
+/**
+ * Hide the icon.
+ */
+ClusterIcon.prototype.hide = function() {
+ if (this.div_) {
+ this.div_.style.display = 'none';
+ }
+ this.visible_ = false;
+};
+
+
+/**
+ * Position and show the icon.
+ */
+ClusterIcon.prototype.show = function() {
+ if (this.div_) {
+ var pos = this.getPosFromLatLng_(this.center_);
+ this.div_.style.cssText = this.createCss(pos);
+ this.div_.style.display = '';
+ }
+ this.visible_ = true;
+};
+
+
+/**
+ * Remove the icon from the map
+ */
+ClusterIcon.prototype.remove = function() {
+ this.setMap(null);
+};
+
+
+/**
+ * Implementation of the onRemove interface.
+ * @ignore
+ */
+ClusterIcon.prototype.onRemove = function() {
+ if (this.div_ && this.div_.parentNode) {
+ this.hide();
+ this.div_.parentNode.removeChild(this.div_);
+ this.div_ = null;
+ }
+};
+
+
+/**
+ * Set the sums of the icon.
+ *
+ * @param {Object} sums The sums containing:
+ * 'text': (string) The text to display in the icon.
+ * 'index': (number) The style index of the icon.
+ */
+ClusterIcon.prototype.setSums = function(sums) {
+ this.sums_ = sums;
+ this.text_ = sums.text;
+ this.index_ = sums.index;
+ if (this.div_) {
+ this.div_.innerHTML = sums.text;
+ }
+
+ this.useStyle();
+};
+
+
+/**
+ * Sets the icon to the the styles.
+ */
+ClusterIcon.prototype.useStyle = function() {
+ var index = Math.max(0, this.sums_.index - 1);
+ index = Math.min(this.styles_.length - 1, index);
+ var style = this.styles_[index];
+ this.url_ = style['url'];
+ this.height_ = style['height'];
+ this.width_ = style['width'];
+ this.textColor_ = style['textColor'];
+ this.anchor_ = style['anchor'];
+ this.textSize_ = style['textSize'];
+ this.backgroundPosition_ = style['backgroundPosition'];
+};
+
+
+/**
+ * Sets the center of the icon.
+ *
+ * @param {google.maps.LatLng} center The latlng to set as the center.
+ */
+ClusterIcon.prototype.setCenter = function(center) {
+ this.center_ = center;
+};
+
+
+/**
+ * Create the css text based on the position of the icon.
+ *
+ * @param {google.maps.Point} pos The position.
+ * @return {string} The css style text.
+ */
+ClusterIcon.prototype.createCss = function(pos) {
+ var style = [];
+ style.push('background-image:url(' + this.url_ + ');');
+ var backgroundPosition = this.backgroundPosition_ ? this.backgroundPosition_ : '0 0';
+ style.push('background-position:' + backgroundPosition + ';');
+
+ if (typeof this.anchor_ === 'object') {
+ if (typeof this.anchor_[0] === 'number' && this.anchor_[0] > 0 &&
+ this.anchor_[0] < this.height_) {
+ style.push('height:' + (this.height_ - this.anchor_[0]) +
+ 'px; padding-top:' + this.anchor_[0] + 'px;');
+ } else {
+ style.push('height:' + this.height_ + 'px; line-height:' + this.height_ +
+ 'px;');
+ }
+ if (typeof this.anchor_[1] === 'number' && this.anchor_[1] > 0 &&
+ this.anchor_[1] < this.width_) {
+ style.push('width:' + (this.width_ - this.anchor_[1]) +
+ 'px; padding-left:' + this.anchor_[1] + 'px;');
+ } else {
+ style.push('width:' + this.width_ + 'px; text-align:center;');
+ }
+ } else {
+ style.push('height:' + this.height_ + 'px; line-height:' +
+ this.height_ + 'px; width:' + this.width_ + 'px; text-align:center;');
+ }
+
+ var txtColor = this.textColor_ ? this.textColor_ : 'black';
+ var txtSize = this.textSize_ ? this.textSize_ : 11;
+
+ style.push('cursor:pointer; top:' + pos.y + 'px; left:' +
+ pos.x + 'px; color:' + txtColor + '; position:absolute; font-size:' +
+ txtSize + 'px; font-family:Arial,sans-serif; font-weight:bold');
+ return style.join('');
+};
+
+
+// Export Symbols for Closure
+// If you are not going to compile with closure then you can remove the
+// code below.
+window['MarkerClusterer'] = MarkerClusterer;
+MarkerClusterer.prototype['addMarker'] = MarkerClusterer.prototype.addMarker;
+MarkerClusterer.prototype['addMarkers'] = MarkerClusterer.prototype.addMarkers;
+MarkerClusterer.prototype['clearMarkers'] =
+ MarkerClusterer.prototype.clearMarkers;
+MarkerClusterer.prototype['fitMapToMarkers'] =
+ MarkerClusterer.prototype.fitMapToMarkers;
+MarkerClusterer.prototype['getCalculator'] =
+ MarkerClusterer.prototype.getCalculator;
+MarkerClusterer.prototype['getGridSize'] =
+ MarkerClusterer.prototype.getGridSize;
+MarkerClusterer.prototype['getExtendedBounds'] =
+ MarkerClusterer.prototype.getExtendedBounds;
+MarkerClusterer.prototype['getMap'] = MarkerClusterer.prototype.getMap;
+MarkerClusterer.prototype['getMarkers'] = MarkerClusterer.prototype.getMarkers;
+MarkerClusterer.prototype['getMaxZoom'] = MarkerClusterer.prototype.getMaxZoom;
+MarkerClusterer.prototype['getStyles'] = MarkerClusterer.prototype.getStyles;
+MarkerClusterer.prototype['getTotalClusters'] =
+ MarkerClusterer.prototype.getTotalClusters;
+MarkerClusterer.prototype['getTotalMarkers'] =
+ MarkerClusterer.prototype.getTotalMarkers;
+MarkerClusterer.prototype['redraw'] = MarkerClusterer.prototype.redraw;
+MarkerClusterer.prototype['removeMarker'] =
+ MarkerClusterer.prototype.removeMarker;
+MarkerClusterer.prototype['removeMarkers'] =
+ MarkerClusterer.prototype.removeMarkers;
+MarkerClusterer.prototype['resetViewport'] =
+ MarkerClusterer.prototype.resetViewport;
+MarkerClusterer.prototype['repaint'] =
+ MarkerClusterer.prototype.repaint;
+MarkerClusterer.prototype['setCalculator'] =
+ MarkerClusterer.prototype.setCalculator;
+MarkerClusterer.prototype['setGridSize'] =
+ MarkerClusterer.prototype.setGridSize;
+MarkerClusterer.prototype['setMaxZoom'] =
+ MarkerClusterer.prototype.setMaxZoom;
+MarkerClusterer.prototype['onAdd'] = MarkerClusterer.prototype.onAdd;
+MarkerClusterer.prototype['draw'] = MarkerClusterer.prototype.draw;
+
+Cluster.prototype['getCenter'] = Cluster.prototype.getCenter;
+Cluster.prototype['getSize'] = Cluster.prototype.getSize;
+Cluster.prototype['getMarkers'] = Cluster.prototype.getMarkers;
+
+ClusterIcon.prototype['onAdd'] = ClusterIcon.prototype.onAdd;
+ClusterIcon.prototype['draw'] = ClusterIcon.prototype.draw;
+ClusterIcon.prototype['onRemove'] = ClusterIcon.prototype.onRemove;
+
+Object.keys = Object.keys || function(o) {
+ var result = [];
+ for(var name in o) {
+ if (o.hasOwnProperty(name))
+ result.push(name);
+ }
+ return result;
+};
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