// source --> https://www.homeliwood.com/wp-content/plugins/ulisting/assets/js/markerclusterer.js?ver=5.3.2 
/**
 * @name MarkerClustererPlus for Google Maps V3
 * @version 2.1.1 [November 4, 2013]
 * @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>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 display height (in pixels) of the cluster icon. Required.
 * @property {number} width The display width (in pixels) of the cluster icon. Required.
 * @property {Array} [anchorText] The position (in pixels) from the center of the cluster icon to
 *  where the text label is to be centered and drawn. The format is <code>[yoffset, xoffset]</code>
 *  where <code>yoffset</code> increases as you go down from center and <code>xoffset</code>
 *  increases to the right of center. The default is <code>[0, 0]</code>.
 * @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 of the top-left corner of the icon. 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 {string} [textDecoration="none"] The value of the CSS <code>text-decoration</code>
 *  property for the label text shown on the cluster icon.
 * @property {string} [fontWeight="bold"] The value of the CSS <code>font-weight</code>
 *  property for the label text shown on the cluster icon.
 * @property {string} [fontStyle="normal"] The value of the CSS <code>font-style</code>
 *  property for the label text shown on the cluster icon.
 * @property {string} [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. Note that the position <i>must</i> be specified in px units.
 */
/**
 * @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 img = "";
		// NOTE: values must be specified in px units
		var bp = this.backgroundPosition_.split(" ");
		var spriteH = parseInt(bp[0].trim(), 10);
		var spriteV = parseInt(bp[1].trim(), 10);
		var pos = this.getPosFromLatLng_(this.center_);
		this.div_.style.cssText = this.createCss(pos);
		img = "<img src='" + this.url_ + "' style='position: absolute; top: " + spriteV + "px; left: " + spriteH + "px; ";
		if (!this.cluster_.getMarkerClusterer().enableRetinaIcons_) {
			img += "clip: rect(" + (-1 * spriteV) + "px, " + ((-1 * spriteH) + this.width_) + "px, " +
				((-1 * spriteV) + this.height_) + "px, " + (-1 * spriteH) + "px);";
		}
		else {
			img += "width: " + this.width_ + "px;" + "height: " + this.height_ + "px;";
		}
		img += "'>";
		this.div_.innerHTML = img + "<div style='" +
			"position: absolute;" +
			"top: " + this.anchorText_[0] + "px;" +
			"left: " + this.anchorText_[1] + "px;" +
			"color: " + this.textColor_ + ";" +
			"font-size: " + this.textSize_ + "px;" +
			"font-family: " + this.fontFamily_ + ";" +
			"font-weight: " + this.fontWeight_ + ";" +
			"font-style: " + this.fontStyle_ + ";" +
			"text-decoration: " + this.textDecoration_ + ";" +
			"text-align: center;" +
			"width: " + this.width_ + "px;" +
			"line-height:" + this.height_ + "px;" +
			"'>" + (this.cluster_.hideLabel_ ? ' ' : this.sums_.text) + "</div>";
		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.anchorText_ = style.anchorText || [0, 0];
	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 = [];
	style.push("cursor: pointer;");
	style.push("position: absolute; top: " + pos.y + "px; left: " + pos.x + "px;");
	style.push("width: " + this.width_ + "px; height: " + this.height_ + "px;");
	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];
	pos.x = parseInt(pos.x, 10);
	pos.y = parseInt(pos.y, 10);
	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.hideLabel_ = mc.getHideLabel();
	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);
	}

	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) {
	for (var i = 0, n = this.markers_.length; i < n; 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 {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 {boolean} [enableRetinaIcons=false] Whether to allow the use of cluster icons that
 * have sizes that are some multiple (typically double) of their actual display size. Icons such
 * as these look better when viewed on high-resolution monitors such as Apple's Retina displays.
 * Note: if this property is <code>true</code>, sprites cannot be used as cluster icons.
 * @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.enableRetinaIcons_ = false;
	if (opt_options.enableRetinaIcons !== undefined) {
		this.enableRetinaIcons_ = opt_options.enableRetinaIcons;
	}
	this.hideLabel_ = false;
	if (opt_options.hideLabel !== undefined) {
		this.hideLabel_ = opt_options.hideLabel;
	}
	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>enableRetinaIcons</code> property.
 *
 * @return {boolean} True if enableRetinaIcons property is set.
 */
MarkerClusterer.prototype.getEnableRetinaIcons = function () {
	return this.enableRetinaIcons_;
};


/**
 *  Sets the value of the <code>enableRetinaIcons</code> property.
 *
 *  @param {boolean} enableRetinaIcons The value of the enableRetinaIcons property.
 */
MarkerClusterer.prototype.setEnableRetinaIcons = function (enableRetinaIcons) {
	this.enableRetinaIcons_ = enableRetinaIcons;
};


/**
 * 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;
};

/**
 * Sets the value of the <code>hideLabel</code> property.
 *
 *  @param {boolean} printable The value of the hideLabel property.
 */
MarkerClusterer.prototype.setHideLabel = function (hideLabel) {
	this.hideLabel_ = hideLabel;
};

/**
 * Returns the value of the <code>hideLabel</code> property.
 *
 * @return {boolean} the value of the hideLabel property.
 */
MarkerClusterer.prototype.getHideLabel = function () {
	return this.hideLabel_;
};

/**
 * 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 key;
	for (key in markers) {
		if (markers.hasOwnProperty(key)) {
			this.pushMarkerTo_(markers[key]);
		}
	}
	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 and map.  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.
 * @param {boolean} [opt_noMapRemove] Set to <code>true</code> to prevent removal from map but still removing from cluster management
 * @return {boolean} True if the marker was removed from the clusterer.
 */
MarkerClusterer.prototype.removeMarker = function (marker, opt_nodraw, opt_noMapRemove) {
	var removeFromMap = true && !opt_noMapRemove;
	var removed = this.removeMarker_(marker,removeFromMap);

	if (!opt_nodraw && removed) {
		this.repaint();
	}

	return removed;
};


/**
 * Removes an array of markers from the cluster and map. 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.
 * @param {boolean} [opt_noMapRemove] Set to <code>true</code> to prevent removal from map but still removing from cluster management
 * @return {boolean} True if markers were removed from the clusterer.
 */
MarkerClusterer.prototype.removeMarkers = function (markers, opt_nodraw, opt_noMapRemove) {
	var i, r;
	var removed = false;
	var removeFromMap = true && !opt_noMapRemove;

	for (i = 0; i < markers.length; i++) {
		r = this.removeMarker_(markers[i],removeFromMap);
		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
 * @param {boolean} removeFromMap set to <code>true</code> to explicitly remove from map as well as cluster manangement
 * @return {boolean} Whether the marker was removed or not
 */
MarkerClusterer.prototype.removeMarker_ = function (marker,removeFromMap) {
	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;
	}

	if (removeFromMap){
		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);

		for (i = 0; i < this.clusters_.length; i++) {
			this.clusters_[i].updateIcon_();
		}
	}
};


/**
 * 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 = "/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];

if (typeof String.prototype.trim !== 'function') {
	/**
	 * IE hack since trim() doesn't exist in all browsers
	 * @return {string} The string with removed whitespace
	 */
	String.prototype.trim = function() {
		return this.replace(/^\s+|\s+$/g, '');
	};
};
// source --> https://www.homeliwood.com/wp-content/plugins/ulisting/assets/js/frontend/stm-google-map.js?ver=1.3.7 
/*----------------------------------  Stm google map -------------------------------*/
Vue.component('stm-google-map', {
	template: `<div v-bind:style='{ width: width, height: height}' v-bind:id='id'></div>`,
	props: {
		id:{
			default: 'stm-google-map-id'
		},
		width: {
			default: '100%'
		},
		map: {
			default: null,
		},
		height: {
			default: '400px'
		},
		zoom_control: {
			default: true,
		},
		screen: {
			default: true
		},
		type_id: {
			default: true,
		},
		view: {
			default: true,
		},
		zoom: {
			default: 10
		},
		center:{
			default:{lat: 0, lng: 0}
		},
		set_center:{
			default:false
		},
		markers:{
			default:null
		},
		marker:{
			default:null
		},
		open_marker:{
			default:"click"
		},
		close_marker:{
			default: null
		},
		bounds:{
			default:false
		},
		cluster:{
			default:false
		},
		open_map_by_hover: {
			default: 'yes',
		},
		polygon_data:{
			default:{
				is_update:false,
				paths: [],
				draggable: true,
				editable: true,
				strokeColor: '#FF0000',
				strokeOpacity: 0.8,
				strokeWeight: 2,
				fillColor: '#FF0000',
				fillOpacity: 0.35
			}
		}
	},
	data: function () {
		return {
			index: 0,
			google:null,
			fade: false,
			polygon:null,
			hasAccess: true,
			infoWindow: null,
			fullscreen: false,
			array_markers : [],
			mapInfoWindow: null,
			marker_cluster:null,
			setIntervalInitMap:null
		}
	},
	mounted: function () {
		var vm = this;
		this.setIntervalInitMap = setInterval(function() {
			if(googleApiLoad && vm.map == null) {
				vm.initMap();
				vm.handleHover();
				setTimeout(function () {
					vm.clickOutside();
				}, 1000);
			}
		}, 1000)
	},
	methods: {
		click(e) {
			this.$emit('click', e);
		},
		/* ------------- initMap ------------- */
		initMap() {
			var vm = this;
			window.clearInterval(this.setIntervalInitMap);
			this.map = new google.maps.Map(document.getElementById(this.id), {
				center: this.center,
				zoom: this.zoom,
				streetViewControl: this.view,
				mapTypeControl: this.type_id,
				zoomControl: this.zoom_control,
				fullscreenControl: this.screen,
			});

			this.map.addListener('click', function(e) {
				vm.click(e)
			});

			if(this.markers != null && this.markers.length)
				this.setMarkers();

			if(vm.polygon_data.paths.length) {
				vm.initPolygonMoveTo();
				vm.polygon = new google.maps.Polygon(vm.polygon_data);
				vm.polygon.setMap(vm.map);
				vm.polygonAddListener();
			}
			vm.$emit('change', vm.map);

			vm.infoWindow = new google.maps.InfoWindow({
				maxWidth: 200
			});
		},

		/* ------------- Marker ------------- */
		setMarkers() {
			if(!googleApiLoad)
				return;
			var vm = this;

			var bounds = null;
			if(vm.markers.length)
				bounds = new google.maps.LatLngBounds();

			var infoWindowContent = [];
			vm.mapInfoWindow = new google.maps.InfoWindow({
				maxWidth: 200
			});

			for (var i = 0; i < vm.markers.length; i++) {
				var newMarker = vm.markers[i];
				infoWindowContent[i] = newMarker.html;


				var marker = new google.maps.Marker({
					position: {lat: parseFloat(newMarker.lat), lng: parseFloat(newMarker.lng)},
					map: vm.map,
					icon: newMarker.icon
				});
				vm.array_markers.push(marker);
				var position = new google.maps.LatLng(newMarker.lat, newMarker.lng);
				bounds.extend(position);

				if(typeof stm_google_map_marker_infowindow != "undefined"){
					stm_google_map_marker_infowindow(vm.mapInfoWindow);
				}

				google.maps.event.addListener(marker, vm.open_marker, (function(marker,i){
					return function(){
						if(vm.infoWindow)
							vm.infoWindow.close();
						if(vm.markers[i].html) {
							vm.mapInfoWindow.setContent(vm.markers[i].html);
							vm.mapInfoWindow.open(vm.map, marker);
						}
					}
				})(marker,i));

				if(vm.close_marker) {
					google.maps.event.addListener(marker, vm.close_marker, (function(marker,i){
						return function(){
							vm.mapInfoWindow.close();
						}
					})(marker,i));
				}
			}
			//Center the map to fit all markers on the screen
			if(this.bounds){
				if(this.polygon_data.paths.length){
					bounds = this.get_polygon_bounds();
				}
				if(bounds != null)
					this.map.fitBounds(bounds);
			}

			if(this.cluster)
				this.markerCluster();

			var myoverlay = new google.maps.OverlayView();
			myoverlay.draw = function () {
				this.getPanes().markerLayer.id='marker_layer';
			};
			myoverlay.setMap(this.map);
		},
		clearMarker() {
			for (var i = 0; i < this.array_markers.length; i++) {
				this.array_markers[i].setMap(null);
			}
			if(this.cluster && this.array_markers.length)
				this.marker_cluster.removeMarkers(this.array_markers);
		},
		markerCluster() {
			this.marker_cluster = new MarkerClusterer(this.map, this.array_markers, {imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'});
		},

		/* ------------- Polygon ------------- */
		polygonAddListener:function(){
			google.maps.event.addListener(this.polygon.getPath(), "insert_at", this.polygonInsertPath);
			google.maps.event.addListener(this.polygon.getPath(), "remove_at", this.polygonRemovePath);
			google.maps.event.addListener(this.polygon.getPath(), "set_at", this.getPolygonCoords);
		},
		polygonInsertPath(){
			this.$emit('set-polygon', this.polygon);
		},
		polygonRemovePath(){
			this.$emit('set-polygon', this.polygon);
		},
		getPolygonCoords() {
			this.polygon_data.is_update = false;
			this.$emit('set-polygon', this.polygon);
		},
		get_polygon_bounds: function(){
			var vm = this;
			if(this.polygon_data.paths.length){
				var bounds = new google.maps.LatLngBounds();
				this.polygon_data.paths.forEach(function(item) {
					var position = new google.maps.LatLng(item.lat, item.lng);
					bounds.extend(position);
				})
			}
			return bounds;
		},
		initPolygonMoveTo: function(latLng){
			var vm = this;
			if (!google.maps.Polygon.prototype.getBounds) {
				google.maps.Polygon.prototype.getBounds = function(latLng) {
					var bounds = new google.maps.LatLngBounds();
					var paths = this.getPaths();
					var path;

					for (var p = 0; p < paths.getLength(); p++) {
						path = paths.getAt(p);
						for (var i = 0; i < path.getLength(); i++) {
							bounds.extend(path.getAt(i));
						}
					}
					return bounds;
				};
			}

			if (!google.maps.Polygon.prototype.moveTo) {
				google.maps.Polygon.prototype.moveTo = function(latLng) {
					// our vars
					var boundsCenter = this.getBounds().getCenter(), // center of the polygonbounds
						paths = this.getPaths(), // paths that make up the polygon
						newPoints =[], // array on which we'll store our new points
						newPaths = []; // array containing the new paths that make up the polygon

					// geodesic enabled: we need to recalculate every point relatively
					if (this.geodesic) {

						// loop all the points of the original path and calculate the bearing + distance of that point relative to the center of the shape
						for (var p = 0; p < paths.getLength(); p++) {
							path = paths.getAt(p);
							newPoints.push([]);

							for (var i = 0; i < path.getLength(); i++) {
								newPoints[newPoints.length-1].push({
									heading: google.maps.geometry.spherical.computeHeading(boundsCenter, path.getAt(i)),
									distance: google.maps.geometry.spherical.computeDistanceBetween(boundsCenter, path.getAt(i))
								});
							}
						}

						// now that we have the "relative" points, rebuild the shapes on the new location around the new center
						for (var j = 0, jl = newPoints.length; j < jl; j++) {
							var shapeCoords = [],
								relativePoint = newPoints[j];
							for (var k = 0, kl = relativePoint.length; k < kl; k++) {
								shapeCoords.push(google.maps.geometry.spherical.computeOffset(
									latLng,
									relativePoint[k].distance,
									relativePoint[k].heading
								));
							}
							newPaths.push(shapeCoords);
						}

					}

					// geodesic not enabled: adjust the coordinates pixelwise
					else {

						var latlngToPoint = function(map, latlng){
							var normalizedPoint = map.getProjection().fromLatLngToPoint(latlng); // returns x,y normalized to 0~255
							var scale = Math.pow(2, map.getZoom());
							var pixelCoordinate = new google.maps.Point(normalizedPoint.x * scale, normalizedPoint.y * scale);
							return pixelCoordinate;
						};
						var pointToLatlng = function(map, point){
							var scale = Math.pow(2, map.getZoom());
							var normalizedPoint = new google.maps.Point(point.x / scale, point.y / scale);
							var latlng = map.getProjection().fromPointToLatLng(normalizedPoint);
							return latlng;
						};

						// calc the pixel position of the bounds and the new latLng
						var boundsCenterPx = latlngToPoint(this.map, boundsCenter),
							latLngPx = latlngToPoint(this.map, latLng);

						// calc the pixel difference between the bounds and the new latLng
						var dLatPx = (boundsCenterPx.y - latLngPx.y) * (-1),
							dLngPx = (boundsCenterPx.x - latLngPx.x) * (-1);

						// adjust all paths
						for (var p = 0; p < paths.getLength(); p++) {
							path = paths.getAt(p);
							newPaths.push([]);
							for (var i = 0; i < path.getLength(); i++) {
								var pixels = latlngToPoint(this.map, path.getAt(i));
								pixels.x += dLngPx;
								pixels.y += dLatPx;
								newPaths[newPaths.length-1].push(pointToLatlng(this.map, pixels));
							}
						}

					}

					// Update the path of the Polygon to the new path
					this.setPaths(newPaths);

					// Return the polygon itself so we can chain
					return this;

				};
			}
		},

		changeMapType: function(e,type){
			let vm = this;
			let types = {
				"hybrid": "HYBRID",
				"roadmap": "ROADMAP",
				"terrain": "TERRAIN",
				"satellite": "SATELLITE",
			};
			let selected_type = types[type];
			let selected = document.querySelectorAll('.selected-map-type')[0];

			if(selected) selected.classList.remove('selected-map-type');
			e.target.classList.add("selected-map-type");
			vm.map.setMapTypeId(google.maps.MapTypeId[selected_type]);
		},
		clickOutside: function(){
			let vm = this;

			window.addEventListener('click', function (e) {
				let typeBtn = document.querySelector('.stm-view');
				if(e.target !== typeBtn){
					vm.fade = false;
				}
			})
		},

		openFullScreen: function(e){
			let vm = this;
			vm.fullscreen = !vm.fullscreen;
			google.maps.event.addListenerOnce(vm.map, 'idle', function () {
				setTimeout(function () {
					google.maps.event.trigger(vm.map, 'resize');
				}, 600);
			});
		},

		mapPagination: function(value){
			let vm = this;
			let max = vm.array_markers.length;

			value = parseInt(value);
			vm.index += value;

			if(vm.index < 0) vm.index = max - 1;
			if(vm.index >= max) vm.index = 0;
			let index;

			if(vm.mapInfoWindow)
				vm.mapInfoWindow.close();

			for(let i = 0 ; i < max; i++){
				if(vm.index === i){
					index = i;
					if( vm.markers[i].html ) {
						vm.map.setCenter(new google.maps.LatLng(vm.markers[i].lat, vm.markers[i].lng))
						vm.map.setZoom(13);
						vm.infoWindow.setContent(vm.markers[i].html);
						vm.infoWindow.open(vm.map, vm.array_markers[i]);
					}
				}
			}
		},

		changeZoom: function(value, type){
			let vm = this;
			value = parseInt(value);
			let zoom = parseInt(vm.map.getZoom());

			if( !(zoom === 0 || zoom === 20) ){
				zoom += value;
				vm.map.setZoom(zoom);
				return true;
			}

			if((zoom === 20 && type === 'minus') || (zoom === 0 && type === 'plus')){
				zoom += value;
				vm.map.setZoom(zoom);
				return true;
			}
		},


		handleHover: function () {
			let vm = this;
			if(vm.open_map_by_hover === 'no') return;

			let inventories = document.querySelectorAll('.inventory-thumbnail-box');

			if(inventories.length === 0){
				inventories = document.querySelectorAll('.ulisting-thumbnail-box');
			}

			for(let j = 0; j < inventories.length; j++){
				inventories[j].addEventListener('mouseover', function () {
					let id = inventories[j].getAttribute('data-id');

					for (let i = 0; i < vm.markers.length; i++) {

						if(vm.infoWindow)
							vm.infoWindow.close();

						if(vm.mapInfoWindow)
							vm.mapInfoWindow.close();

						if(parseInt(vm.markers[i].id) === parseInt(id)){
							if( vm.markers[i].html ) {
								vm.map.setCenter(new google.maps.LatLng(vm.markers[i].lat, vm.markers[i].lng))
								vm.map.setZoom(13);
								setTimeout(function () {
									vm.infoWindow.setContent(vm.markers[i].html);
									vm.infoWindow.open(vm.map, vm.array_markers[i]);
								}, 200);
							}
						}
					}

				});

				inventories[j].addEventListener('mouseleave', function () {
					setTimeout(function () {
						vm.infoWindow.close()
					}, 200);
				})
			}
		},
	},
	watch: {
		markers: {
			handler(val){
				this.clearMarker();
				this.array_markers = [];
				this.setMarkers();
				this.handleHover();
				this.index = 0;
			},
			deep: true
		},
		center: {
			handler(val){
				if(this.map != null && this.set_center){
					val.lat = parseFloat(val.lat) ? parseFloat(val.lat) : 0;
					val.lng = parseFloat(val.lng) ? parseFloat(val.lng) : 0;
					this.map.setCenter(new google.maps.LatLng(val.lat, val.lng));
					if(this.polygon){
						this.polygon.moveTo(new google.maps.LatLng(val.lat, val.lng))
						this.polygonAddListener();
					}
				}

			},
			deep: true
		},
		polygon_data: {
			handler(val){
				var vm = this;

				if(val.is_update && val.paths.length){
					this.polygon_data.is_update = false;

					if(!vm.polygon && vm.polygon_data.paths.length){
						vm.initPolygonMoveTo();
						vm.polygon = new google.maps.Polygon(vm.polygon_data);
					}
					this.polygon.setPaths(val.paths)
					this.polygon.setMap(vm.map);
					if(vm.center.lat != 0 && vm.center.lng != 0 )
						this.polygon.moveTo(new google.maps.LatLng(vm.center.lat, vm.center.lng))
					this.polygonAddListener();

				}
				if(vm.polygon && val.paths.length == 0)
					this.polygon.setMap(null);
			},
			deep: true
		}

	},
});

/*----------------------------------  Stm google autocomplete -------------------------------*/
Vue.component('stm-google-autocomplete', {
	props: {
		id:{
			default: 'stm-google-map-autocomplete'
		},
		value:{
			default: ''
		},
		placeholder:{
			default: 'Enter a location'
		}
	},
	data: function () {
		return {
			place: null,
			address: null,
			autocomplete: null,
			setIntervalInitMap:null,
		}
	},
	mounted: function () {
		var vm = this;
		this.setIntervalInitMap = setInterval(function() {
			if(googleApiLoad && vm.autocomplete == null) {
				vm.init();
			}
		},1000)
	},
	methods: {
		updateValue() {
			this.$emit('place-changed', this.value);
		},
		init:function() {
			var vm = this;
			window.clearInterval(this.setIntervalInitMap);
			this.autocomplete = new google.maps.places.Autocomplete(document.getElementById(this.id));
			this.autocomplete.addListener('place_changed', function() {
				var postal_code = "";
				vm.place = vm.autocomplete.getPlace();
				if (!vm.place.geometry) {
					window.alert("No details available for input: '" + vm.place.name + "'");
					return;
				}
				if (vm.place.address_components) {
					vm.value.address = [
						(vm.place.address_components[0] && vm.place.address_components[0].short_name || ''),
						(vm.place.address_components[1] && vm.place.address_components[1].short_name || ''),
						(vm.place.address_components[2] && vm.place.address_components[2].short_name || '')
					].join(' ');
				}

				for(var i=0;i < vm.place.address_components.length; i++){
					for(var k=0; k < vm.place.address_components[i].types.length; k++){
						if(vm.place.address_components[i].types[k] == "postal_code"){
							postal_code = vm.place.address_components[i].short_name;
						}
					}
				}

				vm.value.latitude = vm.place.geometry.location.lat();
				vm.value.longitude = vm.place.geometry.location.lng();
				vm.value.postal_code = postal_code;
				vm.updateValue();
			})
		},
	}
});
// source --> https://www.homeliwood.com/wp-content/plugins/ulisting/assets/js/frontend/open-street-map.js?ver=1.3.7 
Vue.component('open-street-map', {
    template: `<div v-bind:style='{"z-index" : index, width: width, height: height}' v-bind:id='id' ></div>`,

    props: {
        id: {
            default: 'stm-open-street-map'
        },
        width: {
            default: '100%'
        },
        height: {
            default: '400px'
        },
        zoom: {
            default: 10
        },
        callback_change: {
            default: null,
        },
        center: {
            default: {lat: 0, lng: 0}
        },
        set_center: {
            default: false
        },
        markers: {
            default: null
        },
        marker: {
            default: null
        },
        open_marker: {
            default: "click"
        },
        close_marker: {
            default: null
        },
        bounds: {
            default: false
        },
        cluster: {
            default: false
        },
        access_token: {
            default: '',
        },
        zoom_control: {
            default: true,
        },

        index: {
            default: 1,
        },
        map: {
            default: null,
        },
        open_map_by_hover: {
            default: 'yes',
        },
    },

    data: function () {
        return {
            index: 0,
            location: {
                address: '',
                lng: '',
                lat: '',
            },
            innerWidth: 0,
            osmMarkers: [],
            osm_bounds: null,
            fullscreen: false,
            hasAccess: false,
            array_markers: [],
            marker_cluster: null,
            setIntervalInitMap: null,

        }
    },

    mounted() {
        let vm = this;
        setTimeout(function () {
            vm.renderMap();
            vm.handleResize();
            vm.disableOSMScroll();
        }, 100)
    },

    methods: {
        renderMap: function () {
            let vm = this;
            vm.map = L.map(vm.id, {
                zoom: 10,
                zoomControl: vm.zoom_control,
                center: L.latLng(vm.center.lat, vm.center.lng),
            });

            vm.map.addLayer(vm.getLayer());


            if (vm.markers != null && vm.markers.length) {
                vm.setMarkers();
            }

            vm.$emit('change', vm.map);
            vm.hasAccess = true;
        },

        setMarkers: function () {
            let vm = this;
            vm.osmMarkers = [];
            vm.handleHover();
            setTimeout(function () {
                vm.map.invalidateSize();
            }, 1000);

            if (!vm.markers.length)
                return;

            if (vm.bounds) {
                let bounds = null;
                vm.marker_cluster = L.markerClusterGroup({
                    iconCreateFunction: function (osm_cluster) {
                        return L.divIcon({html: '<div class="uListing-leaflet-cluster">' + osm_cluster.getChildCount() + '</div>'});
                    },
                });

                for (let i = 0; i < vm.markers.length; i++) {
                    let propertyMarker = '';
                    let osmMarker = vm.markers[i];
                    let markerCenter = L.latLng(osmMarker.lat, osmMarker.lng);

                    if (osmMarker.icon.url !== false) {
                        let markerImage = {
                            iconUrl: osmMarker.icon.url,
                            iconSize: [40, 40],
                            iconAnchor: [20, 50],
                            popupAnchor: [1, -50]
                        };

                        let markerOptions = {
                            riseOnHover: true
                        };

                        markerOptions.icon = L.icon(markerImage);
                        propertyMarker = L.marker(markerCenter, markerOptions);
                    } else {
                        propertyMarker = L.marker(markerCenter);
                    }

                    let position = L.latLng(osmMarker.lat, osmMarker.lng);
                    bounds = L.latLngBounds(position);

                    vm.marker_cluster.addLayer(propertyMarker);

                    vm.array_markers.push(propertyMarker);
                    if (vm.osm_bounds !== null) {
                        vm.osm_bounds.extend(propertyMarker.getLatLng());
                    } else {
                        vm.osm_bounds = L.latLngBounds(propertyMarker.getLatLng(), propertyMarker.getLatLng());
                    }

                    propertyMarker.bindPopup(osmMarker.html).on(vm.open_marker, function (e) {
                        let px = vm.map.project(e.target._popup._latlng);
                        px.y -= e.target._popup._container.clientHeight / 2;
                        vm.map.panTo(vm.map.unproject(px), {animate: true});
                        vm.map.invalidateSize();
                    });

                    vm.osmMarkers.push(osmMarker);
                }

                vm.map.addLayer(vm.marker_cluster);

                if (vm.osm_bounds.isValid()) {
                    if (vm.array_markers.length === 1) {
                        let markerCenter = vm.array_markers[0].getLatLng();
                        vm.map.setView(new L.LatLng(markerCenter.lat, markerCenter.lng), 10);
                    } else {
                        vm.map.fitBounds(vm.osm_bounds);
                    }
                }
            } else {

                let osmMarker = vm.markers[0];
                let markerCenter = L.latLng(osmMarker.lat, osmMarker.lng);
                let markerImage = {
                    iconUrl: osmMarker.icon.url,
                    iconSize: [40, 40],
                    iconAnchor: [20, 50],
                    popupAnchor: [1, -50]
                };

                let markerOptions = {
                    riseOnHover: true
                };

                markerOptions.icon = L.icon(markerImage);
                L.marker(markerCenter, markerOptions).addTo(vm.map);
            }

        },

        clearMarker: function () {
            if (this.cluster && this.array_markers.length)
                this.map.removeLayer(this.marker_cluster);

            for (let i = 0; i < this.array_markers.length; i++) {
                this.map.removeLayer(this.array_markers[i]);
            }

        },

        getLayer: function () {
            let vm = this;
            let tLayer = null;

            if (vm.access_token !== '') {
                tLayer = L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=' + vm.access_token, {
                        attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
                        maxZoom: 18,
                        id: 'mapbox.streets',
                        accessToken: 'your.mapbox.access.token'
                    }
                );
            } else {
                tLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
                    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
                });
            }

            return tLayer;
        },

        disableOSMScroll: function () {
            let vm = this;
            vm.innerWidth = window.innerWidth;
            if (1025 > vm.innerWidth) {
                vm.map.scrollWheelZoom.disable();
            }
        },

        handleResize: function () {
            let vm = this;
            if (window.addEventListener) {
                window.addEventListener('resize', function () {
                    vm.disableOSMScroll();
                }, true);
            }
        },

        handleHover: function () {
            let vm = this;

            if(vm.open_map_by_hover === 'no') return;

            let timeOut = 300;
            let removeTime = 500;
            let timeOutZoom = 200;
            let inventories = document.querySelectorAll('.inventory-thumbnail-box');

            if (inventories.length === 0) {
                timeOut = 500;
                removeTime = 800;
                timeOutZoom = 300;
                inventories = document.querySelectorAll('.ulisting-thumbnail-box');
            }

            for (let i = 0; i < inventories.length; i++) {

                inventories[i].addEventListener('mouseover', function () {
                    let id = inventories[i].getAttribute('data-id');

                    for (let j = 0; j < vm.osmMarkers.length; j++) {
                        if (parseInt(vm.osmMarkers[j].id) === parseInt(id)) {

                            let px = vm.map.project({lat: vm.osmMarkers[j].lat, lng: vm.osmMarkers[j].lng});
                            px.y -= 50;
                            vm.map.panTo(vm.map.unproject(px), {animate: true});

                            setTimeout(function () {
                                vm.map.setZoom(13);
                                setTimeout(function () {
                                    vm.array_markers[j].openPopup();
                                }, timeOut);
                                vm.map.invalidateSize();
                            }, timeOutZoom);

                        } else {
                            vm.array_markers[j].closePopup();
                        }
                    }
                });

                inventories[i].addEventListener('mouseleave', function () {
                    setTimeout(function () {
                        for (let j = 0; j < vm.osmMarkers.length; j++) {
                            vm.array_markers[j].closePopup();
                        }
                    }, removeTime)
                });
            }
        },

        mapPagination: function (value) {

            let vm = this;
            let timeOut = 400;
            let zoomTimeout = 200;
            let max = vm.osmMarkers.length;
            let inventories = document.querySelectorAll('.inventory-thumbnail-box');

            vm.index += parseInt(value);

            if(inventories.length === 0){
                timeOut = 500;
                zoomTimeout = 300;
            }

            if(vm.index < 0) vm.index = max - 1;
            if(vm.index >= max) vm.index = 0;

            for(let i = 0 ; i < max; i++){
                if(vm.index === i) {

                    let px = vm.map.project({lat: vm.osmMarkers[i].lat, lng: vm.osmMarkers[i].lng});
                    px.y -= 50;
                    vm.map.panTo(vm.map.unproject(px), {animate: true});

                    setTimeout(function () {
                        vm.map.setZoom(13);
                        setTimeout(function () {
                            vm.array_markers[i].openPopup();
                            vm.map.invalidateSize();
                        }, timeOut)
                    }, zoomTimeout);

                }else{
                    vm.array_markers[i].closePopup();
                }
            }
        },

        changeZoom: function (value, type) {
            let vm = this;
            value = parseInt(value);
            let zoom = vm.map.getZoom();
            zoom = parseInt(zoom);

            if (!(zoom === 0 || zoom === 20)) {
                zoom += value;
                vm.map.setZoom(zoom);
                return true;
            }

            if ((zoom === 20 && type === 'minus') || (zoom === 0 && type === 'plus')) {
                zoom += value;
                vm.map.setZoom(zoom);
                return true;
            }
        },

        openFullScreen: function () {
            let vm = this;
            vm.fullscreen = !vm.fullscreen;

            vm.map.invalidateSize();
            setTimeout(function () {
                vm.map.invalidateSize();
            }, 500);
        },
    },

    watch: {
        markers: {
            handler(val) {
                this.clearMarker();
                this.array_markers = [];
                this.setMarkers();
            },
            deep: true
        },
    }

});