+++ /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];