--- /dev/null
+/*jslint browser: true, confusion: true, sloppy: true, vars: true, nomen: false, plusplus: false, indent: 2 */
+/*global window,google */
+
+/**
+ * @name MarkerClustererPlus for Google Maps V3
+ * @version 2.0.16 [October 18, 2012]
+ * @author Gary Little
+ * @fileoverview
+ * The library creates and manages per-zoom-level clusters for large amounts of markers.
+ * <p>
+ * This is an enhanced V3 implementation of the
+ * <a href="http://gmaps-utility-library-dev.googlecode.com/svn/tags/markerclusterer/"
+ * >V2 MarkerClusterer</a> by Xiaoxi Wu. It is based on the
+ * <a href="http://google-maps-utility-library-v3.googlecode.com/svn/tags/markerclusterer/"
+ * >V3 MarkerClusterer</a> port by Luke Mahe. MarkerClustererPlus was created by Gary Little.
+ * <p>
+ * v2.0 release: MarkerClustererPlus v2.0 is backward compatible with MarkerClusterer v1.0. It
+ * adds support for the <code>ignoreHidden</code>, <code>title</code>, <code>printable</code>,
+ * <code>batchSizeIE</code>, and <code>calculator</code> properties as well as support for
+ * four more events. It also allows greater control over the styling of the text that appears
+ * on the cluster marker. The documentation has been significantly improved and the overall
+ * code has been simplified and polished. Very large numbers of markers can now be managed
+ * without causing Javascript timeout errors on Internet Explorer. Note that the name of the
+ * <code>clusterclick</code> event has been deprecated. The new name is <code>click</code>,
+ * so please change your application code now.
+ */
+
+/**
+ * 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.
+ */
+
+
+/**
+ * @name ClusterIconStyle
+ * @class This class represents the object for values in the <code>styles</code> array passed
+ * to the {@link MarkerClusterer} constructor. The element in this array that is used to
+ * style the cluster icon is determined by calling the <code>calculator</code> function.
+ *
+ * @property {string} url The URL of the cluster icon image file. Required.
+ * @property {number} height The height (in pixels) of the cluster icon. Required.
+ * @property {number} width The width (in pixels) of the cluster icon. Required.
+ * @property {Array} [anchor] The anchor position (in pixels) of the label text to be shown on
+ * the cluster icon, relative to the top left corner of the icon.
+ * The format is <code>[yoffset, xoffset]</code>. The <code>yoffset</code> must be positive
+ * and less than <code>height</code> and the <code>xoffset</code> must be positive and less
+ * than <code>width</code>. The default is to anchor the label text so that it is centered
+ * on the icon.
+ * @property {Array} [anchorIcon] The anchor position (in pixels) of the cluster icon. This is the
+ * spot on the cluster icon that is to be aligned with the cluster position. The format is
+ * <code>[yoffset, xoffset]</code> where <code>yoffset</code> increases as you go down and
+ * <code>xoffset</code> increases to the right. The default anchor position is the center of the
+ * cluster icon.
+ * @property {string} [textColor="black"] The color of the label text shown on the
+ * cluster icon.
+ * @property {number} [textSize=11] The size (in pixels) of the label text shown on the
+ * cluster icon.
+ * @property {number} [textDecoration="none"] The value of the CSS <code>text-decoration</code>
+ * property for the label text shown on the cluster icon.
+ * @property {number} [fontWeight="bold"] The value of the CSS <code>font-weight</code>
+ * property for the label text shown on the cluster icon.
+ * @property {number} [fontStyle="normal"] The value of the CSS <code>font-style</code>
+ * property for the label text shown on the cluster icon.
+ * @property {number} [fontFamily="Arial,sans-serif"] The value of the CSS <code>font-family</code>
+ * property for the label text shown on the cluster icon.
+ * @property {string} [backgroundPosition="0 0"] The position of the cluster icon image
+ * within the image defined by <code>url</code>. The format is <code>"xpos ypos"</code>
+ * (the same format as for the CSS <code>background-position</code> property). You must set
+ * this property appropriately when the image defined by <code>url</code> represents a sprite
+ * containing multiple images.
+ */
+/**
+ * @name ClusterIconInfo
+ * @class This class is an object containing general information about a cluster icon. This is
+ * the object that a <code>calculator</code> function returns.
+ *
+ * @property {string} text The text of the label to be shown on the cluster icon.
+ * @property {number} index The index plus 1 of the element in the <code>styles</code>
+ * array to be used to style the cluster icon.
+ * @property {string} title The tooltip to display when the mouse moves over the cluster icon.
+ * If this value is <code>undefined</code> or <code>""</code>, <code>title</code> is set to the
+ * value of the <code>title</code> property passed to the MarkerClusterer.
+ */
+/**
+ * A cluster icon.
+ *
+ * @constructor
+ * @extends google.maps.OverlayView
+ * @param {Cluster} cluster The cluster with which the icon is to be associated.
+ * @param {Array} [styles] An array of {@link ClusterIconStyle} defining the cluster icons
+ * to use for various cluster sizes.
+ * @private
+ */
+function ClusterIcon(cluster, styles) {
+ cluster.getMarkerClusterer().extend(ClusterIcon, google.maps.OverlayView);
+
+ this.cluster_ = cluster;
+ this.className_ = cluster.getMarkerClusterer().getClusterClass();
+ this.styles_ = styles;
+ this.center_ = null;
+ this.div_ = null;
+ this.sums_ = null;
+ this.visible_ = false;
+
+ this.setMap(cluster.getMap()); // Note: this causes onAdd to be called
+}
+
+
+/**
+ * Adds the icon to the DOM.
+ */
+ClusterIcon.prototype.onAdd = function () {
+ var cClusterIcon = this;
+ var cMouseDownInCluster;
+ var cDraggingMapByCluster;
+
+ this.div_ = document.createElement("div");
+ this.div_.className = this.className_;
+ if (this.visible_) {
+ this.show();
+ }
+
+ this.getPanes().overlayMouseTarget.appendChild(this.div_);
+
+ // Fix for Issue 157
+ this.boundsChangedListener_ = google.maps.event.addListener(this.getMap(), "bounds_changed", function () {
+ cDraggingMapByCluster = cMouseDownInCluster;
+ });
+
+ google.maps.event.addDomListener(this.div_, "mousedown", function () {
+ cMouseDownInCluster = true;
+ cDraggingMapByCluster = false;
+ });
+
+ google.maps.event.addDomListener(this.div_, "click", function (e) {
+ cMouseDownInCluster = false;
+ if (!cDraggingMapByCluster) {
+ var theBounds;
+ var mz;
+ var mc = cClusterIcon.cluster_.getMarkerClusterer();
+ /**
+ * This event is fired when a cluster marker is clicked.
+ * @name MarkerClusterer#click
+ * @param {Cluster} c The cluster that was clicked.
+ * @event
+ */
+ google.maps.event.trigger(mc, "click", cClusterIcon.cluster_);
+ google.maps.event.trigger(mc, "clusterclick", cClusterIcon.cluster_); // deprecated name
+
+ // The default click handler follows. Disable it by setting
+ // the zoomOnClick property to false.
+ if (mc.getZoomOnClick()) {
+ // Zoom into the cluster.
+ mz = mc.getMaxZoom();
+ theBounds = cClusterIcon.cluster_.getBounds();
+ mc.getMap().fitBounds(theBounds);
+ // There is a fix for Issue 170 here:
+ setTimeout(function () {
+ mc.getMap().fitBounds(theBounds);
+ // Don't zoom beyond the max zoom level
+ if (mz !== null && (mc.getMap().getZoom() > mz)) {
+ mc.getMap().setZoom(mz + 1);
+ }
+ }, 100);
+ }
+
+ // Prevent event propagation to the map:
+ e.cancelBubble = true;
+ if (e.stopPropagation) {
+ e.stopPropagation();
+ }
+ }
+ });
+
+ google.maps.event.addDomListener(this.div_, "mouseover", function () {
+ var mc = cClusterIcon.cluster_.getMarkerClusterer();
+ /**
+ * This event is fired when the mouse moves over a cluster marker.
+ * @name MarkerClusterer#mouseover
+ * @param {Cluster} c The cluster that the mouse moved over.
+ * @event
+ */
+ google.maps.event.trigger(mc, "mouseover", cClusterIcon.cluster_);
+ });
+
+ google.maps.event.addDomListener(this.div_, "mouseout", function () {
+ var mc = cClusterIcon.cluster_.getMarkerClusterer();
+ /**
+ * This event is fired when the mouse moves out of a cluster marker.
+ * @name MarkerClusterer#mouseout
+ * @param {Cluster} c The cluster that the mouse moved out of.
+ * @event
+ */
+ google.maps.event.trigger(mc, "mouseout", cClusterIcon.cluster_);
+ });
+};
+
+
+/**
+ * Removes the icon from the DOM.
+ */
+ClusterIcon.prototype.onRemove = function () {
+ if (this.div_ && this.div_.parentNode) {
+ this.hide();
+ google.maps.event.removeListener(this.boundsChangedListener_);
+ google.maps.event.clearInstanceListeners(this.div_);
+ this.div_.parentNode.removeChild(this.div_);
+ this.div_ = null;
+ }
+};
+
+
+/**
+ * Draws the icon.
+ */
+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";
+ }
+};
+
+
+/**
+ * Hides the icon.
+ */
+ClusterIcon.prototype.hide = function () {
+ if (this.div_) {
+ this.div_.style.display = "none";
+ }
+ this.visible_ = false;
+};
+
+
+/**
+ * Positions and shows the icon.
+ */
+ClusterIcon.prototype.show = function () {
+ if (this.div_) {
+ var pos = this.getPosFromLatLng_(this.center_);
+ this.div_.style.cssText = this.createCss(pos);
+ if (this.cluster_.printable_) {
+ // (Would like to use "width: inherit;" below, but doesn't work with MSIE)
+ this.div_.innerHTML = "<img src='" + this.url_ + "'><div style='position: absolute; top: 0px; left: 0px; width: " + this.width_ + "px;'>" + this.sums_.text + "</div>";
+ } else {
+ this.div_.innerHTML = this.sums_.text;
+ }
+ if (typeof this.sums_.title === "undefined" || this.sums_.title === "") {
+ this.div_.title = this.cluster_.getMarkerClusterer().getTitle();
+ } else {
+ this.div_.title = this.sums_.title;
+ }
+ this.div_.style.display = "";
+ }
+ this.visible_ = true;
+};
+
+
+/**
+ * Sets the icon styles to the appropriate element in the styles array.
+ *
+ * @param {ClusterIconInfo} sums The icon label text and styles index.
+ */
+ClusterIcon.prototype.useStyle = function (sums) {
+ this.sums_ = sums;
+ var index = Math.max(0, 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.anchor_ = style.anchor;
+ this.anchorIcon_ = style.anchorIcon || [parseInt(this.height_ / 2, 10), parseInt(this.width_ / 2, 10)];
+ this.textColor_ = style.textColor || "black";
+ this.textSize_ = style.textSize || 11;
+ this.textDecoration_ = style.textDecoration || "none";
+ this.fontWeight_ = style.fontWeight || "bold";
+ this.fontStyle_ = style.fontStyle || "normal";
+ this.fontFamily_ = style.fontFamily || "Arial,sans-serif";
+ this.backgroundPosition_ = style.backgroundPosition || "0 0";
+};
+
+
+/**
+ * Sets the position at which to center the icon.
+ *
+ * @param {google.maps.LatLng} center The latlng to set as the center.
+ */
+ClusterIcon.prototype.setCenter = function (center) {
+ this.center_ = center;
+};
+
+
+/**
+ * Creates the cssText style parameter based on the position of the icon.
+ *
+ * @param {google.maps.Point} pos The position of the icon.
+ * @return {string} The CSS style text.
+ */
+ClusterIcon.prototype.createCss = function (pos) {
+ var style = [];
+ if (!this.cluster_.printable_) {
+ style.push('background-image:url(' + this.url_ + ');');
+ style.push('background-position:' + this.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;');
+ }
+
+ style.push('cursor:pointer; top:' + pos.y + 'px; left:' +
+ pos.x + 'px; color:' + this.textColor_ + '; position:absolute; font-size:' +
+ this.textSize_ + 'px; font-family:' + this.fontFamily_ + '; font-weight:' +
+ this.fontWeight_ + '; font-style:' + this.fontStyle_ + '; text-decoration:' +
+ this.textDecoration_ + ';');
+
+ return style.join("");
+};
+
+
+/**
+ * Returns the position at which to place the DIV depending on the latlng.
+ *
+ * @param {google.maps.LatLng} latlng The position in latlng.
+ * @return {google.maps.Point} The position in pixels.
+ */
+ClusterIcon.prototype.getPosFromLatLng_ = function (latlng) {
+ var pos = this.getProjection().fromLatLngToDivPixel(latlng);
+ pos.x -= this.anchorIcon_[1];
+ pos.y -= this.anchorIcon_[0];
+ return pos;
+};
+
+
+/**
+ * Creates a single cluster that manages a group of proximate markers.
+ * Used internally, do not call this constructor directly.
+ * @constructor
+ * @param {MarkerClusterer} mc The <code>MarkerClusterer</code> object with which this
+ * cluster is associated.
+ */
+function Cluster(mc) {
+ this.markerClusterer_ = mc;
+ this.map_ = mc.getMap();
+ this.gridSize_ = mc.getGridSize();
+ this.minClusterSize_ = mc.getMinimumClusterSize();
+ this.averageCenter_ = mc.getAverageCenter();
+ this.printable_ = mc.getPrintable();
+ this.markers_ = [];
+ this.center_ = null;
+ this.bounds_ = null;
+ this.clusterIcon_ = new ClusterIcon(this, mc.getStyles());
+}
+
+
+/**
+ * Returns the number of markers managed by the cluster. You can call this from
+ * a <code>click</code>, <code>mouseover</code>, or <code>mouseout</code> event handler
+ * for the <code>MarkerClusterer</code> object.
+ *
+ * @return {number} The number of markers in the cluster.
+ */
+Cluster.prototype.getSize = function () {
+ return this.markers_.length;
+};
+
+
+/**
+ * Returns the array of markers managed by the cluster. You can call this from
+ * a <code>click</code>, <code>mouseover</code>, or <code>mouseout</code> event handler
+ * for the <code>MarkerClusterer</code> object.
+ *
+ * @return {Array} The array of markers in the cluster.
+ */
+Cluster.prototype.getMarkers = function () {
+ return this.markers_;
+};
+
+
+/**
+ * Returns the center of the cluster. You can call this from
+ * a <code>click</code>, <code>mouseover</code>, or <code>mouseout</code> event handler
+ * for the <code>MarkerClusterer</code> object.
+ *
+ * @return {google.maps.LatLng} The center of the cluster.
+ */
+Cluster.prototype.getCenter = function () {
+ return this.center_;
+};
+
+
+/**
+ * Returns the map with which the cluster is associated.
+ *
+ * @return {google.maps.Map} The map.
+ * @ignore
+ */
+Cluster.prototype.getMap = function () {
+ return this.map_;
+};
+
+
+/**
+ * Returns the <code>MarkerClusterer</code> object with which the cluster is associated.
+ *
+ * @return {MarkerClusterer} The associated marker clusterer.
+ * @ignore
+ */
+Cluster.prototype.getMarkerClusterer = function () {
+ return this.markerClusterer_;
+};
+
+
+/**
+ * Returns the bounds of the cluster.
+ *
+ * @return {google.maps.LatLngBounds} the cluster bounds.
+ * @ignore
+ */
+Cluster.prototype.getBounds = function () {
+ var i;
+ var bounds = new google.maps.LatLngBounds(this.center_, this.center_);
+ var markers = this.getMarkers();
+ for (i = 0; i < markers.length; i++) {
+ bounds.extend(markers[i].getPosition());
+ }
+ return bounds;
+};
+
+
+/**
+ * Removes the cluster from the map.
+ *
+ * @ignore
+ */
+Cluster.prototype.remove = function () {
+ this.clusterIcon_.setMap(null);
+ this.markers_ = [];
+ delete this.markers_;
+};
+
+
+/**
+ * Adds a marker to the cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to be added.
+ * @return {boolean} True if the marker was added.
+ * @ignore
+ */
+Cluster.prototype.addMarker = function (marker) {
+ var i;
+ var mCount;
+ var mz;
+
+ 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);
+
+ mCount = this.markers_.length;
+ mz = this.markerClusterer_.getMaxZoom();
+ if (mz !== null && this.map_.getZoom() > mz) {
+ // Zoomed in past max zoom, so show the marker.
+ if (marker.getMap() !== this.map_) {
+ marker.setMap(this.map_);
+ }
+ } else if (mCount < this.minClusterSize_) {
+ // Min cluster size not reached so show the marker.
+ if (marker.getMap() !== this.map_) {
+ marker.setMap(this.map_);
+ }
+ } else if (mCount === this.minClusterSize_) {
+ // Hide the markers that were showing.
+ for (i = 0; i < mCount; i++) {
+ this.markers_[i].setMap(null);
+ }
+ } else {
+ marker.setMap(null);
+ }
+
+ this.updateIcon_();
+ return true;
+};
+
+
+/**
+ * Determines if a marker lies within the cluster's bounds.
+ *
+ * @param {google.maps.Marker} marker The marker to check.
+ * @return {boolean} True if the marker lies in the bounds.
+ * @ignore
+ */
+Cluster.prototype.isMarkerInClusterBounds = function (marker) {
+ return this.bounds_.contains(marker.getPosition());
+};
+
+
+/**
+ * Calculates the extended bounds of the cluster with the grid.
+ */
+Cluster.prototype.calculateBounds_ = function () {
+ var bounds = new google.maps.LatLngBounds(this.center_, this.center_);
+ this.bounds_ = this.markerClusterer_.getExtendedBounds(bounds);
+};
+
+
+/**
+ * Updates the cluster icon.
+ */
+Cluster.prototype.updateIcon_ = function () {
+ var mCount = this.markers_.length;
+ var mz = this.markerClusterer_.getMaxZoom();
+
+ if (mz !== null && this.map_.getZoom() > mz) {
+ this.clusterIcon_.hide();
+ return;
+ }
+
+ if (mCount < 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_.useStyle(sums);
+ this.clusterIcon_.show();
+};
+
+
+/**
+ * Determines if a marker has already been added to the cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to check.
+ * @return {boolean} True if the marker has already been added.
+ */
+Cluster.prototype.isMarkerAlreadyAdded_ = function (marker) {
+ var i;
+ if (this.markers_.indexOf) {
+ return this.markers_.indexOf(marker) !== -1;
+ } else {
+ for (i = 0; i < this.markers_.length; i++) {
+ if (marker === this.markers_[i]) {
+ return true;
+ }
+ }
+ }
+ return false;
+};
+
+
+/**
+ * @name MarkerClustererOptions
+ * @class This class represents the optional parameter passed to
+ * the {@link MarkerClusterer} constructor.
+ * @property {number} [gridSize=60] The grid size of a cluster in pixels. The grid is a square.
+ * @property {number} [maxZoom=null] The maximum zoom level at which clustering is enabled or
+ * <code>null</code> if clustering is to be enabled at all zoom levels.
+ * @property {boolean} [zoomOnClick=true] Whether to zoom the map when a cluster marker is
+ * clicked. You may want to set this to <code>false</code> if you have installed a handler
+ * for the <code>click</code> event and it deals with zooming on its own.
+ * @property {boolean} [averageCenter=false] Whether the position of a cluster marker should be
+ * the average position of all markers in the cluster. If set to <code>false</code>, the
+ * cluster marker is positioned at the location of the first marker added to the cluster.
+ * @property {number} [minimumClusterSize=2] The minimum number of markers needed in a cluster
+ * before the markers are hidden and a cluster marker appears.
+ * @property {boolean} [ignoreHidden=false] Whether to ignore hidden markers in clusters. You
+ * may want to set this to <code>true</code> to ensure that hidden markers are not included
+ * in the marker count that appears on a cluster marker (this count is the value of the
+ * <code>text</code> property of the result returned by the default <code>calculator</code>).
+ * If set to <code>true</code> and you change the visibility of a marker being clustered, be
+ * sure to also call <code>MarkerClusterer.repaint()</code>.
+ * @property {boolean} [printable=false] Whether to make the cluster icons printable. Do not
+ * set to <code>true</code> if the <code>url</code> fields in the <code>styles</code> array
+ * refer to image sprite files.
+ * @property {string} [title=""] The tooltip to display when the mouse moves over a cluster
+ * marker. (Alternatively, you can use a custom <code>calculator</code> function to specify a
+ * different tooltip for each cluster marker.)
+ * @property {function} [calculator=MarkerClusterer.CALCULATOR] The function used to determine
+ * the text to be displayed on a cluster marker and the index indicating which style to use
+ * for the cluster marker. The input parameters for the function are (1) the array of markers
+ * represented by a cluster marker and (2) the number of cluster icon styles. It returns a
+ * {@link ClusterIconInfo} object. The default <code>calculator</code> returns a
+ * <code>text</code> property which is the number of markers in the cluster and an
+ * <code>index</code> property which is one higher than the lowest integer such that
+ * <code>10^i</code> exceeds the number of markers in the cluster, or the size of the styles
+ * array, whichever is less. The <code>styles</code> array element used has an index of
+ * <code>index</code> minus 1. For example, the default <code>calculator</code> returns a
+ * <code>text</code> value of <code>"125"</code> and an <code>index</code> of <code>3</code>
+ * for a cluster icon representing 125 markers so the element used in the <code>styles</code>
+ * array is <code>2</code>. A <code>calculator</code> may also return a <code>title</code>
+ * property that contains the text of the tooltip to be used for the cluster marker. If
+ * <code>title</code> is not defined, the tooltip is set to the value of the <code>title</code>
+ * property for the MarkerClusterer.
+ * @property {string} [clusterClass="cluster"] The name of the CSS class defining general styles
+ * for the cluster markers. Use this class to define CSS styles that are not set up by the code
+ * that processes the <code>styles</code> array.
+ * @property {Array} [styles] An array of {@link ClusterIconStyle} elements defining the styles
+ * of the cluster markers to be used. The element to be used to style a given cluster marker
+ * is determined by the function defined by the <code>calculator</code> property.
+ * The default is an array of {@link ClusterIconStyle} elements whose properties are derived
+ * from the values for <code>imagePath</code>, <code>imageExtension</code>, and
+ * <code>imageSizes</code>.
+ * @property {number} [batchSize=MarkerClusterer.BATCH_SIZE] Set this property to the
+ * number of markers to be processed in a single batch when using a browser other than
+ * Internet Explorer (for Internet Explorer, use the batchSizeIE property instead).
+ * @property {number} [batchSizeIE=MarkerClusterer.BATCH_SIZE_IE] When Internet Explorer is
+ * being used, markers are processed in several batches with a small delay inserted between
+ * each batch in an attempt to avoid Javascript timeout errors. Set this property to the
+ * number of markers to be processed in a single batch; select as high a number as you can
+ * without causing a timeout error in the browser. This number might need to be as low as 100
+ * if 15,000 markers are being managed, for example.
+ * @property {string} [imagePath=MarkerClusterer.IMAGE_PATH]
+ * The full URL of the root name of the group of image files to use for cluster icons.
+ * The complete file name is of the form <code>imagePath</code>n.<code>imageExtension</code>
+ * where n is the image file number (1, 2, etc.).
+ * @property {string} [imageExtension=MarkerClusterer.IMAGE_EXTENSION]
+ * The extension name for the cluster icon image files (e.g., <code>"png"</code> or
+ * <code>"jpg"</code>).
+ * @property {Array} [imageSizes=MarkerClusterer.IMAGE_SIZES]
+ * An array of numbers containing the widths of the group of
+ * <code>imagePath</code>n.<code>imageExtension</code> image files.
+ * (The images are assumed to be square.)
+ */
+/**
+ * Creates a MarkerClusterer object with the options specified in {@link MarkerClustererOptions}.
+ * @constructor
+ * @extends google.maps.OverlayView
+ * @param {google.maps.Map} map The Google map to attach to.
+ * @param {Array.<google.maps.Marker>} [opt_markers] The markers to be added to the cluster.
+ * @param {MarkerClustererOptions} [opt_options] The optional parameters.
+ */
+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);
+
+ opt_markers = opt_markers || [];
+ opt_options = opt_options || {};
+
+ this.markers_ = [];
+ this.clusters_ = [];
+ this.listeners_ = [];
+ this.activeMap_ = null;
+ this.ready_ = false;
+
+ this.gridSize_ = opt_options.gridSize || 60;
+ this.minClusterSize_ = opt_options.minimumClusterSize || 2;
+ this.maxZoom_ = opt_options.maxZoom || null;
+ this.styles_ = opt_options.styles || [];
+ this.title_ = opt_options.title || "";
+ this.zoomOnClick_ = true;
+ if (opt_options.zoomOnClick !== undefined) {
+ this.zoomOnClick_ = opt_options.zoomOnClick;
+ }
+ this.averageCenter_ = false;
+ if (opt_options.averageCenter !== undefined) {
+ this.averageCenter_ = opt_options.averageCenter;
+ }
+ this.ignoreHidden_ = false;
+ if (opt_options.ignoreHidden !== undefined) {
+ this.ignoreHidden_ = opt_options.ignoreHidden;
+ }
+ this.printable_ = false;
+ if (opt_options.printable !== undefined) {
+ this.printable_ = opt_options.printable;
+ }
+ this.imagePath_ = opt_options.imagePath || MarkerClusterer.IMAGE_PATH;
+ this.imageExtension_ = opt_options.imageExtension || MarkerClusterer.IMAGE_EXTENSION;
+ this.imageSizes_ = opt_options.imageSizes || MarkerClusterer.IMAGE_SIZES;
+ this.calculator_ = opt_options.calculator || MarkerClusterer.CALCULATOR;
+ this.batchSize_ = opt_options.batchSize || MarkerClusterer.BATCH_SIZE;
+ this.batchSizeIE_ = opt_options.batchSizeIE || MarkerClusterer.BATCH_SIZE_IE;
+ this.clusterClass_ = opt_options.clusterClass || "cluster";
+
+ if (navigator.userAgent.toLowerCase().indexOf("msie") !== -1) {
+ // Try to avoid IE timeout when processing a huge number of markers:
+ this.batchSize_ = this.batchSizeIE_;
+ }
+
+ this.setupStyles_();
+
+ this.addMarkers(opt_markers, true);
+ this.setMap(map); // Note: this causes onAdd to be called
+}
+
+
+/**
+ * Implementation of the onAdd interface method.
+ * @ignore
+ */
+MarkerClusterer.prototype.onAdd = function () {
+ var cMarkerClusterer = this;
+
+ this.activeMap_ = this.getMap();
+ this.ready_ = true;
+
+ this.repaint();
+
+ // Add the map event listeners
+ this.listeners_ = [
+ google.maps.event.addListener(this.getMap(), "zoom_changed", function () {
+ cMarkerClusterer.resetViewport_(false);
+ // Workaround for this Google bug: when map is at level 0 and "-" of
+ // zoom slider is clicked, a "zoom_changed" event is fired even though
+ // the map doesn't zoom out any further. In this situation, no "idle"
+ // event is triggered so the cluster markers that have been removed
+ // do not get redrawn. Same goes for a zoom in at maxZoom.
+ if (this.getZoom() === (this.get("minZoom") || 0) || this.getZoom() === this.get("maxZoom")) {
+ google.maps.event.trigger(this, "idle");
+ }
+ }),
+ google.maps.event.addListener(this.getMap(), "idle", function () {
+ cMarkerClusterer.redraw_();
+ })
+ ];
+};
+
+
+/**
+ * Implementation of the onRemove interface method.
+ * Removes map event listeners and all cluster icons from the DOM.
+ * All managed markers are also put back on the map.
+ * @ignore
+ */
+MarkerClusterer.prototype.onRemove = function () {
+ var i;
+
+ // Put all the managed markers back on the map:
+ for (i = 0; i < this.markers_.length; i++) {
+ if (this.markers_[i].getMap() !== this.activeMap_) {
+ this.markers_[i].setMap(this.activeMap_);
+ }
+ }
+
+ // Remove all clusters:
+ for (i = 0; i < this.clusters_.length; i++) {
+ this.clusters_[i].remove();
+ }
+ this.clusters_ = [];
+
+ // Remove map event listeners:
+ for (i = 0; i < this.listeners_.length; i++) {
+ google.maps.event.removeListener(this.listeners_[i]);
+ }
+ this.listeners_ = [];
+
+ this.activeMap_ = null;
+ this.ready_ = false;
+};
+
+
+/**
+ * Implementation of the draw interface method.
+ * @ignore
+ */
+MarkerClusterer.prototype.draw = function () {};
+
+
+/**
+ * Sets up the styles object.
+ */
+MarkerClusterer.prototype.setupStyles_ = function () {
+ var i, size;
+ if (this.styles_.length > 0) {
+ return;
+ }
+
+ for (i = 0; i < this.imageSizes_.length; i++) {
+ size = this.imageSizes_[i];
+ this.styles_.push({
+ url: this.imagePath_ + (i + 1) + "." + this.imageExtension_,
+ height: size,
+ width: size
+ });
+ }
+};
+
+
+/**
+ * Fits the map to the bounds of the markers managed by the clusterer.
+ */
+MarkerClusterer.prototype.fitMapToMarkers = function () {
+ var i;
+ var markers = this.getMarkers();
+ var bounds = new google.maps.LatLngBounds();
+ for (i = 0; i < markers.length; i++) {
+ bounds.extend(markers[i].getPosition());
+ }
+
+ this.getMap().fitBounds(bounds);
+};
+
+
+/**
+ * Returns the value of the <code>gridSize</code> property.
+ *
+ * @return {number} The grid size.
+ */
+MarkerClusterer.prototype.getGridSize = function () {
+ return this.gridSize_;
+};
+
+
+/**
+ * Sets the value of the <code>gridSize</code> property.
+ *
+ * @param {number} gridSize The grid size.
+ */
+MarkerClusterer.prototype.setGridSize = function (gridSize) {
+ this.gridSize_ = gridSize;
+};
+
+
+/**
+ * Returns the value of the <code>minimumClusterSize</code> property.
+ *
+ * @return {number} The minimum cluster size.
+ */
+MarkerClusterer.prototype.getMinimumClusterSize = function () {
+ return this.minClusterSize_;
+};
+
+/**
+ * Sets the value of the <code>minimumClusterSize</code> property.
+ *
+ * @param {number} minimumClusterSize The minimum cluster size.
+ */
+MarkerClusterer.prototype.setMinimumClusterSize = function (minimumClusterSize) {
+ this.minClusterSize_ = minimumClusterSize;
+};
+
+
+/**
+ * Returns the value of the <code>maxZoom</code> property.
+ *
+ * @return {number} The maximum zoom level.
+ */
+MarkerClusterer.prototype.getMaxZoom = function () {
+ return this.maxZoom_;
+};
+
+
+/**
+ * Sets the value of the <code>maxZoom</code> property.
+ *
+ * @param {number} maxZoom The maximum zoom level.
+ */
+MarkerClusterer.prototype.setMaxZoom = function (maxZoom) {
+ this.maxZoom_ = maxZoom;
+};
+
+
+/**
+ * Returns the value of the <code>styles</code> property.
+ *
+ * @return {Array} The array of styles defining the cluster markers to be used.
+ */
+MarkerClusterer.prototype.getStyles = function () {
+ return this.styles_;
+};
+
+
+/**
+ * Sets the value of the <code>styles</code> property.
+ *
+ * @param {Array.<ClusterIconStyle>} styles The array of styles to use.
+ */
+MarkerClusterer.prototype.setStyles = function (styles) {
+ this.styles_ = styles;
+};
+
+
+/**
+ * Returns the value of the <code>title</code> property.
+ *
+ * @return {string} The content of the title text.
+ */
+MarkerClusterer.prototype.getTitle = function () {
+ return this.title_;
+};
+
+
+/**
+ * Sets the value of the <code>title</code> property.
+ *
+ * @param {string} title The value of the title property.
+ */
+MarkerClusterer.prototype.setTitle = function (title) {
+ this.title_ = title;
+};
+
+
+/**
+ * Returns the value of the <code>zoomOnClick</code> property.
+ *
+ * @return {boolean} True if zoomOnClick property is set.
+ */
+MarkerClusterer.prototype.getZoomOnClick = function () {
+ return this.zoomOnClick_;
+};
+
+
+/**
+ * Sets the value of the <code>zoomOnClick</code> property.
+ *
+ * @param {boolean} zoomOnClick The value of the zoomOnClick property.
+ */
+MarkerClusterer.prototype.setZoomOnClick = function (zoomOnClick) {
+ this.zoomOnClick_ = zoomOnClick;
+};
+
+
+/**
+ * Returns the value of the <code>averageCenter</code> property.
+ *
+ * @return {boolean} True if averageCenter property is set.
+ */
+MarkerClusterer.prototype.getAverageCenter = function () {
+ return this.averageCenter_;
+};
+
+
+/**
+ * Sets the value of the <code>averageCenter</code> property.
+ *
+ * @param {boolean} averageCenter The value of the averageCenter property.
+ */
+MarkerClusterer.prototype.setAverageCenter = function (averageCenter) {
+ this.averageCenter_ = averageCenter;
+};
+
+
+/**
+ * Returns the value of the <code>ignoreHidden</code> property.
+ *
+ * @return {boolean} True if ignoreHidden property is set.
+ */
+MarkerClusterer.prototype.getIgnoreHidden = function () {
+ return this.ignoreHidden_;
+};
+
+
+/**
+ * Sets the value of the <code>ignoreHidden</code> property.
+ *
+ * @param {boolean} ignoreHidden The value of the ignoreHidden property.
+ */
+MarkerClusterer.prototype.setIgnoreHidden = function (ignoreHidden) {
+ this.ignoreHidden_ = ignoreHidden;
+};
+
+
+/**
+ * Returns the value of the <code>imageExtension</code> property.
+ *
+ * @return {string} The value of the imageExtension property.
+ */
+MarkerClusterer.prototype.getImageExtension = function () {
+ return this.imageExtension_;
+};
+
+
+/**
+ * Sets the value of the <code>imageExtension</code> property.
+ *
+ * @param {string} imageExtension The value of the imageExtension property.
+ */
+MarkerClusterer.prototype.setImageExtension = function (imageExtension) {
+ this.imageExtension_ = imageExtension;
+};
+
+
+/**
+ * Returns the value of the <code>imagePath</code> property.
+ *
+ * @return {string} The value of the imagePath property.
+ */
+MarkerClusterer.prototype.getImagePath = function () {
+ return this.imagePath_;
+};
+
+
+/**
+ * Sets the value of the <code>imagePath</code> property.
+ *
+ * @param {string} imagePath The value of the imagePath property.
+ */
+MarkerClusterer.prototype.setImagePath = function (imagePath) {
+ this.imagePath_ = imagePath;
+};
+
+
+/**
+ * Returns the value of the <code>imageSizes</code> property.
+ *
+ * @return {Array} The value of the imageSizes property.
+ */
+MarkerClusterer.prototype.getImageSizes = function () {
+ return this.imageSizes_;
+};
+
+
+/**
+ * Sets the value of the <code>imageSizes</code> property.
+ *
+ * @param {Array} imageSizes The value of the imageSizes property.
+ */
+MarkerClusterer.prototype.setImageSizes = function (imageSizes) {
+ this.imageSizes_ = imageSizes;
+};
+
+
+/**
+ * Returns the value of the <code>calculator</code> property.
+ *
+ * @return {function} the value of the calculator property.
+ */
+MarkerClusterer.prototype.getCalculator = function () {
+ return this.calculator_;
+};
+
+
+/**
+ * Sets the value of the <code>calculator</code> property.
+ *
+ * @param {function(Array.<google.maps.Marker>, number)} calculator The value
+ * of the calculator property.
+ */
+MarkerClusterer.prototype.setCalculator = function (calculator) {
+ this.calculator_ = calculator;
+};
+
+
+/**
+ * Returns the value of the <code>printable</code> property.
+ *
+ * @return {boolean} the value of the printable property.
+ */
+MarkerClusterer.prototype.getPrintable = function () {
+ return this.printable_;
+};
+
+
+/**
+ * Sets the value of the <code>printable</code> property.
+ *
+ * @param {boolean} printable The value of the printable property.
+ */
+MarkerClusterer.prototype.setPrintable = function (printable) {
+ this.printable_ = printable;
+};
+
+
+/**
+ * Returns the value of the <code>batchSizeIE</code> property.
+ *
+ * @return {number} the value of the batchSizeIE property.
+ */
+MarkerClusterer.prototype.getBatchSizeIE = function () {
+ return this.batchSizeIE_;
+};
+
+
+/**
+ * Sets the value of the <code>batchSizeIE</code> property.
+ *
+ * @param {number} batchSizeIE The value of the batchSizeIE property.
+ */
+MarkerClusterer.prototype.setBatchSizeIE = function (batchSizeIE) {
+ this.batchSizeIE_ = batchSizeIE;
+};
+
+
+/**
+ * Returns the value of the <code>clusterClass</code> property.
+ *
+ * @return {string} the value of the clusterClass property.
+ */
+MarkerClusterer.prototype.getClusterClass = function () {
+ return this.clusterClass_;
+};
+
+
+/**
+ * Sets the value of the <code>clusterClass</code> property.
+ *
+ * @param {string} clusterClass The value of the clusterClass property.
+ */
+MarkerClusterer.prototype.setClusterClass = function (clusterClass) {
+ this.clusterClass_ = clusterClass;
+};
+
+
+/**
+ * Returns the array of markers managed by the clusterer.
+ *
+ * @return {Array} The array of markers managed by the clusterer.
+ */
+MarkerClusterer.prototype.getMarkers = function () {
+ return this.markers_;
+};
+
+
+/**
+ * Returns the number of markers managed by the clusterer.
+ *
+ * @return {number} The number of markers.
+ */
+MarkerClusterer.prototype.getTotalMarkers = function () {
+ return this.markers_.length;
+};
+
+
+/**
+ * Returns the current array of clusters formed by the clusterer.
+ *
+ * @return {Array} The array of clusters formed by the clusterer.
+ */
+MarkerClusterer.prototype.getClusters = function () {
+ return this.clusters_;
+};
+
+
+/**
+ * Returns the number of clusters formed by the clusterer.
+ *
+ * @return {number} The number of clusters formed by the clusterer.
+ */
+MarkerClusterer.prototype.getTotalClusters = function () {
+ return this.clusters_.length;
+};
+
+
+/**
+ * Adds a marker to the clusterer. The clusters are redrawn unless
+ * <code>opt_nodraw</code> is set to <code>true</code>.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ * @param {boolean} [opt_nodraw] Set to <code>true</code> to prevent redrawing.
+ */
+MarkerClusterer.prototype.addMarker = function (marker, opt_nodraw) {
+ this.pushMarkerTo_(marker);
+ if (!opt_nodraw) {
+ this.redraw_();
+ }
+};
+
+
+/**
+ * Adds an array of markers to the clusterer. The clusters are redrawn unless
+ * <code>opt_nodraw</code> is set to <code>true</code>.
+ *
+ * @param {Array.<google.maps.Marker>} markers The markers to add.
+ * @param {boolean} [opt_nodraw] Set to <code>true</code> to prevent redrawing.
+ */
+MarkerClusterer.prototype.addMarkers = function (markers, opt_nodraw) {
+ var i;
+ for (i = 0; i < markers.length; i++) {
+ this.pushMarkerTo_(markers[i]);
+ }
+ if (!opt_nodraw) {
+ this.redraw_();
+ }
+};
+
+
+/**
+ * Pushes a marker to the clusterer.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ */
+MarkerClusterer.prototype.pushMarkerTo_ = function (marker) {
+ // If the marker is draggable add a listener so we can update the clusters on the dragend:
+ if (marker.getDraggable()) {
+ var cMarkerClusterer = this;
+ google.maps.event.addListener(marker, "dragend", function () {
+ if (cMarkerClusterer.ready_) {
+ this.isAdded = false;
+ cMarkerClusterer.repaint();
+ }
+ });
+ }
+ marker.isAdded = false;
+ this.markers_.push(marker);
+};
+
+
+/**
+ * Removes a marker from the cluster. The clusters are redrawn unless
+ * <code>opt_nodraw</code> is set to <code>true</code>. Returns <code>true</code> if the
+ * marker was removed from the clusterer.
+ *
+ * @param {google.maps.Marker} marker The marker to remove.
+ * @param {boolean} [opt_nodraw] Set to <code>true</code> to prevent redrawing.
+ * @return {boolean} True if the marker was removed from the clusterer.
+ */
+MarkerClusterer.prototype.removeMarker = function (marker, opt_nodraw) {
+ var removed = this.removeMarker_(marker);
+
+ if (!opt_nodraw && removed) {
+ this.repaint();
+ }
+
+ return removed;
+};
+
+
+/**
+ * Removes an array of markers from the cluster. The clusters are redrawn unless
+ * <code>opt_nodraw</code> is set to <code>true</code>. Returns <code>true</code> if markers
+ * were removed from the clusterer.
+ *
+ * @param {Array.<google.maps.Marker>} markers The markers to remove.
+ * @param {boolean} [opt_nodraw] Set to <code>true</code> to prevent redrawing.
+ * @return {boolean} True if markers were removed from the clusterer.
+ */
+MarkerClusterer.prototype.removeMarkers = function (markers, opt_nodraw) {
+ var i, r;
+ var removed = false;
+
+ for (i = 0; i < markers.length; i++) {
+ r = this.removeMarker_(markers[i]);
+ removed = removed || r;
+ }
+
+ if (!opt_nodraw && removed) {
+ this.repaint();
+ }
+
+ return removed;
+};
+
+
+/**
+ * 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
+ */
+MarkerClusterer.prototype.removeMarker_ = function (marker) {
+ var i;
+ var index = -1;
+ if (this.markers_.indexOf) {
+ index = this.markers_.indexOf(marker);
+ } else {
+ for (i = 0; i < this.markers_.length; i++) {
+ if (marker === this.markers_[i]) {
+ index = i;
+ break;
+ }
+ }
+ }
+
+ if (index === -1) {
+ // Marker is not in our list of markers, so do nothing:
+ return false;
+ }
+
+ marker.setMap(null);
+ this.markers_.splice(index, 1); // Remove the marker from the list of managed markers
+ return true;
+};
+
+
+/**
+ * Removes all clusters and markers from the map and also removes all markers
+ * managed by the clusterer.
+ */
+MarkerClusterer.prototype.clearMarkers = function () {
+ this.resetViewport_(true);
+ this.markers_ = [];
+};
+
+
+/**
+ * Recalculates and redraws all the marker clusters from scratch.
+ * Call this after changing any properties.
+ */
+MarkerClusterer.prototype.repaint = function () {
+ var oldClusters = this.clusters_.slice();
+ this.clusters_ = [];
+ this.resetViewport_(false);
+ this.redraw_();
+
+ // Remove the old clusters.
+ // Do it in a timeout to prevent blinking effect.
+ setTimeout(function () {
+ var i;
+ for (i = 0; i < oldClusters.length; i++) {
+ oldClusters[i].remove();
+ }
+ }, 0);
+};
+
+
+/**
+ * Returns the current bounds extended by the grid size.
+ *
+ * @param {google.maps.LatLngBounds} bounds The bounds to extend.
+ * @return {google.maps.LatLngBounds} The extended bounds.
+ * @ignore
+ */
+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;
+};
+
+
+/**
+ * Redraws all the clusters.
+ */
+MarkerClusterer.prototype.redraw_ = function () {
+ this.createClusters_(0);
+};
+
+
+/**
+ * Removes all clusters from the map. The markers are also removed from the map
+ * if <code>opt_hide</code> is set to <code>true</code>.
+ *
+ * @param {boolean} [opt_hide] Set to <code>true</code> to also remove the markers
+ * from the map.
+ */
+MarkerClusterer.prototype.resetViewport_ = function (opt_hide) {
+ var i, marker;
+ // Remove all the clusters
+ for (i = 0; i < this.clusters_.length; i++) {
+ this.clusters_[i].remove();
+ }
+ this.clusters_ = [];
+
+ // Reset the markers to not be added and to be removed from the map.
+ for (i = 0; i < this.markers_.length; i++) {
+ marker = this.markers_[i];
+ marker.isAdded = false;
+ if (opt_hide) {
+ marker.setMap(null);
+ }
+ }
+};
+
+
+/**
+ * Calculates the distance between two latlng locations in km.
+ *
+ * @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.
+ * @see http://www.movable-type.co.uk/scripts/latlong.html
+*/
+MarkerClusterer.prototype.distanceBetweenPoints_ = function (p1, p2) {
+ 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;
+};
+
+
+/**
+ * Determines 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.
+ */
+MarkerClusterer.prototype.isMarkerInBounds_ = function (marker, bounds) {
+ return bounds.contains(marker.getPosition());
+};
+
+
+/**
+ * Adds a marker to a cluster, or creates a new cluster.
+ *
+ * @param {google.maps.Marker} marker The marker to add.
+ */
+MarkerClusterer.prototype.addToClosestCluster_ = function (marker) {
+ var i, d, cluster, center;
+ var distance = 40000; // Some large number
+ var clusterToAddTo = null;
+ for (i = 0; i < this.clusters_.length; i++) {
+ cluster = this.clusters_[i];
+ center = cluster.getCenter();
+ if (center) {
+ d = this.distanceBetweenPoints_(center, marker.getPosition());
+ if (d < distance) {
+ distance = d;
+ clusterToAddTo = cluster;
+ }
+ }
+ }
+
+ if (clusterToAddTo && clusterToAddTo.isMarkerInClusterBounds(marker)) {
+ clusterToAddTo.addMarker(marker);
+ } else {
+ cluster = new Cluster(this);
+ cluster.addMarker(marker);
+ this.clusters_.push(cluster);
+ }
+};
+
+
+/**
+ * Creates the clusters. This is done in batches to avoid timeout errors
+ * in some browsers when there is a huge number of markers.
+ *
+ * @param {number} iFirst The index of the first marker in the batch of
+ * markers to be added to clusters.
+ */
+MarkerClusterer.prototype.createClusters_ = function (iFirst) {
+ var i, marker;
+ var mapBounds;
+ var cMarkerClusterer = this;
+ if (!this.ready_) {
+ return;
+ }
+
+ // Cancel previous batch processing if we're working on the first batch:
+ if (iFirst === 0) {
+ /**
+ * This event is fired when the <code>MarkerClusterer</code> begins
+ * clustering markers.
+ * @name MarkerClusterer#clusteringbegin
+ * @param {MarkerClusterer} mc The MarkerClusterer whose markers are being clustered.
+ * @event
+ */
+ google.maps.event.trigger(this, "clusteringbegin", this);
+
+ if (typeof this.timerRefStatic !== "undefined") {
+ clearTimeout(this.timerRefStatic);
+ delete this.timerRefStatic;
+ }
+ }
+
+ // Get our current map view bounds.
+ // Create a new bounds object so we don't affect the map.
+ //
+ // See Comments 9 & 11 on Issue 3651 relating to this workaround for a Google Maps bug:
+ if (this.getMap().getZoom() > 3) {
+ mapBounds = new google.maps.LatLngBounds(this.getMap().getBounds().getSouthWest(),
+ this.getMap().getBounds().getNorthEast());
+ } else {
+ mapBounds = new google.maps.LatLngBounds(new google.maps.LatLng(85.02070771743472, -178.48388434375), new google.maps.LatLng(-85.08136444384544, 178.00048865625));
+ }
+ var bounds = this.getExtendedBounds(mapBounds);
+
+ var iLast = Math.min(iFirst + this.batchSize_, this.markers_.length);
+
+ for (i = iFirst; i < iLast; i++) {
+ marker = this.markers_[i];
+ if (!marker.isAdded && this.isMarkerInBounds_(marker, bounds)) {
+ if (!this.ignoreHidden_ || (this.ignoreHidden_ && marker.getVisible())) {
+ this.addToClosestCluster_(marker);
+ }
+ }
+ }
+
+ if (iLast < this.markers_.length) {
+ this.timerRefStatic = setTimeout(function () {
+ cMarkerClusterer.createClusters_(iLast);
+ }, 0);
+ } else {
+ delete this.timerRefStatic;
+
+ /**
+ * This event is fired when the <code>MarkerClusterer</code> stops
+ * clustering markers.
+ * @name MarkerClusterer#clusteringend
+ * @param {MarkerClusterer} mc The MarkerClusterer whose markers are being clustered.
+ * @event
+ */
+ google.maps.event.trigger(this, "clusteringend", this);
+ }
+};
+
+
+/**
+ * Extends an object's prototype by another's.
+ *
+ * @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) {
+ var property;
+ for (property in object.prototype) {
+ this.prototype[property] = object.prototype[property];
+ }
+ return this;
+ }).apply(obj1, [obj2]);
+};
+
+
+/**
+ * The default function for determining the label text and style
+ * for a cluster icon.
+ *
+ * @param {Array.<google.maps.Marker>} markers The array of markers represented by the cluster.
+ * @param {number} numStyles The number of marker styles available.
+ * @return {ClusterIconInfo} The information resource for the cluster.
+ * @constant
+ * @ignore
+ */
+MarkerClusterer.CALCULATOR = function (markers, numStyles) {
+ var index = 0;
+ var title = "";
+ var count = markers.length.toString();
+
+ var dv = count;
+ while (dv !== 0) {
+ dv = parseInt(dv / 10, 10);
+ index++;
+ }
+
+ index = Math.min(index, numStyles);
+ return {
+ text: count,
+ index: index,
+ title: title
+ };
+};
+
+
+/**
+ * The number of markers to process in one batch.
+ *
+ * @type {number}
+ * @constant
+ */
+MarkerClusterer.BATCH_SIZE = 2000;
+
+
+/**
+ * The number of markers to process in one batch (IE only).
+ *
+ * @type {number}
+ * @constant
+ */
+MarkerClusterer.BATCH_SIZE_IE = 500;
+
+
+/**
+ * The default root name for the marker cluster images.
+ *
+ * @type {string}
+ * @constant
+ */
+MarkerClusterer.IMAGE_PATH = "http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus/images/m";
+
+
+/**
+ * The default extension name for the marker cluster images.
+ *
+ * @type {string}
+ * @constant
+ */
+MarkerClusterer.IMAGE_EXTENSION = "png";
+
+
+/**
+ * The default array of sizes for the marker cluster images.
+ *
+ * @type {Array.<number>}
+ * @constant
+ */
+MarkerClusterer.IMAGE_SIZES = [53, 56, 66, 78, 90];
git://git.onelab.eu / myslice.git / blobdiff