// Clusterer.js - marker clustering routines for Google Maps apps
//
// Using these routines is very easy.
//
// 1) Load the routines into your code:
//
//        <script src="http://www.acme.com/javascript/Clusterer.js" type="text/javascript"></script>
//
// 2) Create a Clusterer object, passing it your map object:
//
//        var clusterer = new Clusterer( map );
//
// 3) Wherever you now do map.addOverlay( marker ), instead call
//    clusterer.AddMarker( marker, title ).  The title is just a
//    short descriptive string to use in the cluster info-boxes.
//
// 4) If you are doing any map.removeOverlay( marker ) calls, change those
//    to clusterer.RemoveMarker( marker ).
//
// That's it!  Everything else happens automatically.
//
//
// The current version of this code is always available at:
// http://www.acme.com/javascript/
//
//
// Copyright © 2005,2006 by Jef Poskanzer <jef@mail.acme.com>.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// For commentary on this license please see http://www.acme.com/license.html

// Constructor.
Clusterer = function ( map )
    {
    this.map                  = map;
    this.markers              = [];
    this.clusters             = [];
    this.timeout              = null;
    this.currentZoomLevel     = map.getZoom();
    this.maxVisibleMarkers    = Clusterer.defaultMaxVisibleMarkers;
    this.gridSize             = Clusterer.defaultGridSize;
    this.minMarkersPerCluster = Clusterer.defaultMinMarkersPerCluster;
    this.maxLinesPerInfoBox   = Clusterer.defaultMaxLinesPerInfoBox;
    this.icon                 = Clusterer.defaultIcon;

    GEvent.addListener( map, 'zoomend', Clusterer.MakeCaller( Clusterer.Display, this ) );
    GEvent.addListener( map, 'moveend', Clusterer.MakeCaller( Clusterer.Display, this ) );
    GEvent.addListener( map, 'infowindowclose', Clusterer.MakeCaller( Clusterer.PopDown, this ) );
    };

Clusterer.defaultMaxVisibleMarkers = 75;
Clusterer.defaultGridSize = 5;
Clusterer.defaultMinMarkersPerCluster = 5;
Clusterer.defaultMaxLinesPerInfoBox = 10;

/* ################################## */
// Determines if the user agent is MSIE 6. If it is, then displays the map icon images as .gif, else .png.
// Added by JYEAROUS on 3/17/2008
var UA = navigator.userAgent;
var fileType = ".png";

if (UA.indexOf("MSIE 6.0") > -1)
	fileType = ".gif";
/* ################################## */

Clusterer.defaultIcon = new GIcon();
Clusterer.defaultIcon.image = '../graphics/storelocator/ktlogo-trans' + fileType;
Clusterer.defaultIcon.iconSize = new GSize( 30, 27 );
Clusterer.defaultIcon.iconAnchor = new GPoint( 13, 34 );
Clusterer.defaultIcon.infoWindowAnchor = new GPoint( 13, 3 );

//Clusterer.defaultIcon.shadow = 'http://www.acme.com/resources/images/markers/shadow_large.PNG';
//Clusterer.defaultIcon.shadowSize = new GSize( 56, 51 );
//Clusterer.defaultIcon.infoShadowAnchor = new GPoint( 27, 37 );

// Call this to change the cluster icon.
Clusterer.prototype.SetIcon = function ( icon ){ this.icon = icon; };

// Changes the maximum number of visible markers before clustering kicks in.
Clusterer.prototype.SetMaxVisibleMarkers = function ( n ){ this.maxVisibleMarkers = n; };

// Sets the minumum number of markers for a cluster.
Clusterer.prototype.SetMinMarkersPerCluster = function ( n ){ this.minMarkersPerCluster = n; };

// Sets the maximum number of lines in an info box.
Clusterer.prototype.SetMaxLinesPerInfoBox = function ( n ){ this.maxLinesPerInfoBox = n; };

// Call this to add a marker.
Clusterer.prototype.AddMarker = function ( marker, title )
    {
      if ( marker.setMap != null )
			  marker.setMap( this.map );

      marker.title = title;
      marker.onMap = false;
      this.markers.push( marker );
      this.DisplayLater();
    };

// Call this to remove a marker.
Clusterer.prototype.RemoveMarker = function ( marker )
    {
      for ( var i = 0; i < this.markers.length; ++i )
			  if ( this.markers[i] == marker )
	      {
	      if ( marker.onMap )
				  this.map.removeOverlay( marker );

				  for ( var j = 0; j < this.clusters.length; ++j )
				  {
					  var cluster = this.clusters[j];
  					
					  if ( cluster != null )
					  {
						  for ( var k = 0; k < cluster.markers.length; ++k )
						  if ( cluster.markers[k] == marker )
						  {
							  cluster.markers[k] = null;
							  --cluster.markerCount;
							  break;
						  }
  		    
						  if ( cluster.markerCount == 0 )
						  {
							  this.ClearCluster( cluster );
							  this.clusters[j] = null;
						  }
						  else if ( cluster == this.poppedUpCluster )
							  Clusterer.RePop( this );
					  }
				  }
  	    
				  this.markers[i] = null;
				  break;
	      }
			  this.DisplayLater();
    };

Clusterer.prototype.DisplayLater = function ()
    {
	    if ( this.timeout != null )
				clearTimeout( this.timeout );
				
	    this.timeout = setTimeout( Clusterer.MakeCaller( Clusterer.Display, this ), 50 );
    };

Clusterer.Display = function ( clusterer )
    {
			/* ################################## */
			// Determines if the user agent is MSIE 6. If it is, then displays the map icon images as .gif, else .png.
			// Added by JYEAROUS on 3/17/2008
			var UA = navigator.userAgent;
			var fileType = ".png";
			
			if (UA.indexOf("MSIE 6.0") > -1)
				fileType = ".gif";
			/* ################################## */
		
	    var i, j, marker, cluster;
			clearTimeout( clusterer.timeout );
	    var newZoomLevel = clusterer.map.getZoom();
	    
			if ( newZoomLevel != clusterer.currentZoomLevel )
			{
				// When the zoom level changes, we have to remove all the clusters.
				for ( i = 0; i < clusterer.clusters.length; ++i )
					if ( clusterer.clusters[i] != null )
					{
						clusterer.ClearCluster( clusterer.clusters[i] );
						clusterer.clusters[i] = null;
					}
				
				clusterer.clusters.length = 0;
				clusterer.currentZoomLevel = newZoomLevel;
			}

			// Get the current bounds of the visible area.
			var bounds = clusterer.map.getBounds();

			// Expand the bounds a little, so things look smoother when scrolling by small amounts.
			var sw = bounds.getSouthWest();
			var ne = bounds.getNorthEast();
			var dx = ne.lng() - sw.lng();
			var dy = ne.lat() - sw.lat();
			
			if ( dx < 300 && dy < 150 )
			{
				dx *= 0.10;
				dy *= 0.10;
				bounds = new GLatLngBounds(new GLatLng( sw.lat() - dy, sw.lng() - dx ), new GLatLng( ne.lat() + dy, ne.lng() + dx ) );
			}

      // Partition the markers into visible and non-visible lists.
      var visibleMarkers = [];
      var nonvisibleMarkers = [];
      
      for ( i = 0; i < clusterer.markers.length; ++i )
	    {
	      marker = clusterer.markers[i];
	      
	      if ( marker != null )
	        if ( bounds.contains( marker.getPoint() ) )
		        visibleMarkers.push( marker );
	        else
		        nonvisibleMarkers.push( marker );
	    }

      // Take down the non-visible markers.
      for ( i = 0; i < nonvisibleMarkers.length; ++i )
	    {
	      marker = nonvisibleMarkers[i];
	    
	      if ( marker.onMap )
	      {
	        clusterer.map.removeOverlay( marker );
	        marker.onMap = false;
	      }
	    }

      // Take down the non-visible clusters.
      for ( i = 0; i < clusterer.clusters.length; ++i )
	    {
	      cluster = clusterer.clusters[i];
	    
	      if ( cluster != null && ! bounds.contains( cluster.marker.getPoint() ) && cluster.onMap )
	      {
	        clusterer.map.removeOverlay( cluster.marker );
	        cluster.onMap = false;
	      }
	    }

      // Clustering!  This is some complicated stuff.  We have three goals
      // here.  One, limit the number of markers & clusters displayed, so the
      // maps code doesn't slow to a crawl.  Two, when possible keep existing
      // clusters instead of replacing them with new ones, so that the app pans
      // better.  And three, of course, be CPU and memory efficient.
      if ( visibleMarkers.length > clusterer.maxVisibleMarkers )
	    {
	      // Add to the list of clusters by splitting up the current bounds into a grid.
	      var latRange = bounds.getNorthEast().lat() - bounds.getSouthWest().lat();
	      var latInc = latRange / clusterer.gridSize;
	      var lngInc = latInc / Math.cos( ( bounds.getNorthEast().lat() + bounds.getSouthWest().lat() ) / 2.0 * Math.PI / 180.0 );
  	
	      for ( var lat = bounds.getSouthWest().lat(); lat <= bounds.getNorthEast().lat(); lat += latInc )
	        for ( var lng = bounds.getSouthWest().lng(); lng <= bounds.getNorthEast().lng(); lng += lngInc )
		      {
		        cluster = new Object();
		        cluster.clusterer = clusterer;
		        cluster.bounds = new GLatLngBounds( new GLatLng( lat, lng ), new GLatLng( lat + latInc, lng + lngInc ) );
		        cluster.markers = [];
		        cluster.markerCount = 0;
		        cluster.onMap = false;
		        cluster.marker = null;
		        clusterer.clusters.push( cluster );
		      }

	      // Put all the unclustered visible markers into a cluster - the first one it fits in, which favors pre-existing clusters.
	      for ( i = 0; i < visibleMarkers.length; ++i )
	      {
	        marker = visibleMarkers[i];
  	    
	        if ( marker != null && ! marker.inCluster )
		      {
		        for ( j = 0; j < clusterer.clusters.length; ++j )
		        {
		          cluster = clusterer.clusters[j];
		          if ( cluster != null && cluster.bounds.contains( marker.getPoint() ) )
			        {
			          cluster.markers.push( marker );
			          ++cluster.markerCount;
			          marker.inCluster = true;
			        }
		        }
		      }
	      }

	      // Get rid of any clusters containing only a few markers.
	      for ( i = 0; i < clusterer.clusters.length; ++i )
	        if ( clusterer.clusters[i] != null && clusterer.clusters[i].markerCount < clusterer.minMarkersPerCluster )
		      {
		        clusterer.ClearCluster( clusterer.clusters[i] );
		        clusterer.clusters[i] = null;
		      }

	      // Shrink the clusters list.
	      for ( i = clusterer.clusters.length - 1; i >= 0; --i )
	        if ( clusterer.clusters[i] != null )
		        break;
	        else
		        --clusterer.clusters.length;

	      // Ok, we have our clusters. Go thru the markers in each cluster and remove them from the map if they are currently up.
	      for ( i = 0; i < clusterer.clusters.length; ++i )
	      {
	        cluster = clusterer.clusters[i];
  	        
	        if ( cluster != null )
		      {
		        for ( j = 0; j < cluster.markers.length; ++j )
		        {
		          marker = cluster.markers[j];
  		        
		          if ( marker != null && marker.onMap )
			        {
			          clusterer.map.removeOverlay( marker );
			          marker.onMap = false;
			        }
		        }
		      }
	      }

	      // Now make cluster-markers for any clusters that need one.
	      for ( i = 0; i < clusterer.clusters.length; ++i )
	      {
	        cluster = clusterer.clusters[i];
  	        
	        if ( cluster != null && cluster.marker == null )
		      {
		        // Figure out the average coordinates of the markers in this cluster.
		        var xTotal = 0.0, yTotal = 0.0;
  		    
		        for ( j = 0; j < cluster.markers.length; ++j )
		        {
		          marker = cluster.markers[j];
	            var imageURL = marker.getIcon().image;
	            
	            switch (imageURL)
	            {
	              case "../graphics/storelocator/iconkslogo-trans" + fileType:
	                var cIcon = new GIcon();
	                cIcon.image = "../graphics/storelocator/kslogo-trans" + fileType;
	                cIcon.iconSize = new GSize( 30, 27 );
                  cIcon.iconAnchor = new GPoint( 13, 34 );
                  cIcon.infoWindowAnchor = new GPoint( 13, 3 );
                  clusterer.icon = cIcon;
                  break;
                case "../graphics/storelocator/icontoplogo-trans" + fileType:
                  var cIcon = new GIcon();
	                cIcon.image = "../graphics/storelocator/toplogo-trans" + fileType;
	                cIcon.iconSize = new GSize( 30, 27 );
                  cIcon.iconAnchor = new GPoint( 13, 34 );
                  cIcon.infoWindowAnchor = new GPoint( 13, 3 );
                  clusterer.icon = cIcon;
                  break;
                default:
                  clusterer.icon = Clusterer.defaultIcon;
              }
  		        
		          if ( marker != null )
			        {
			          xTotal += ( + marker.getPoint().lng() );
			          yTotal += ( + marker.getPoint().lat() );
			        }
		        }
  		      
		        var location = new GLatLng( yTotal / cluster.markerCount, xTotal / cluster.markerCount );
		        marker = new GMarker( location, { icon: clusterer.icon } );
		        cluster.marker = marker;
		        GEvent.addListener( marker, 'click', Clusterer.MakeCaller( Clusterer.PopUp, cluster ) );
		      }
	      }
	    } //end This is complicated stuff!

      // Display the visible markers not already up and not in clusters.
      for ( i = 0; i < visibleMarkers.length; ++i )
	    {
	      marker = visibleMarkers[i];
  	
	      if ( marker != null && ! marker.onMap && ! marker.inCluster )
	      {
	        clusterer.map.addOverlay( marker );
  	      
	        if ( marker.addedToMap != null )
		        marker.addedToMap();
  		      
	        marker.onMap = true;
	      }
	    }

      // Display the visible clusters not already up.
      for ( i = 0; i < clusterer.clusters.length; ++i )
	    {
	      cluster = clusterer.clusters[i];
  	    
	      if ( cluster != null && ! cluster.onMap && bounds.contains( cluster.marker.getPoint() ) )
	      {
	        clusterer.map.addOverlay( cluster.marker );
	        cluster.onMap = true;
	      }
	    }

      // In case a cluster is currently popped-up, re-pop to get any new markers into the infobox.
      Clusterer.RePop( clusterer );
    };

Clusterer.PopUp = function ( cluster )
    {
      var clusterer = cluster.clusterer;
      var html = '<table width="300">';
      var n = 0;
    
      for ( var i = 0; i < cluster.markers.length; ++i )
	    {
	      var marker = cluster.markers[i];
	    
	      if ( marker != null )
	      {
	        ++n;
	        html += '<tr><td>';
	        
	        if ( marker.getIcon().smallImage != null )
		        html += '<img src="' + marker.getIcon().smallImage + '">';
	        else
		        html += '<img src="' + marker.getIcon().image + '" width="' + ( marker.getIcon().iconSize.width / 2 ) + '" height="' + ( marker.getIcon().iconSize.height / 2 ) + '">';
		        
	        html += '</td><td>' + marker.title + '</td></tr>';
	        
	        if ( n == clusterer.maxLinesPerInfoBox - 1 && cluster.markerCount > clusterer.maxLinesPerInfoBox  )
		      {
		        html += '<tr><td colspan="2">...and ' + ( cluster.markerCount - n ) + ' more</td></tr>';
		        break;
		      }
	      }
	    }
	    
      html += '</table>';
      clusterer.map.closeInfoWindow();
      cluster.marker.openInfoWindowHtml( html );
      clusterer.poppedUpCluster = cluster;
    };

Clusterer.RePop = function ( clusterer )
    {
      if ( clusterer.poppedUpCluster != null )
	      Clusterer.PopUp( clusterer.poppedUpCluster );
    };

Clusterer.PopDown = function ( clusterer ) { clusterer.poppedUpCluster = null; };

Clusterer.prototype.ClearCluster = function ( cluster )
    {
      var i, marker;

      for ( i = 0; i < cluster.markers.length; ++i )
	      if ( cluster.markers[i] != null )
	      {
	        cluster.markers[i].inCluster = false;
	        cluster.markers[i] = null;
	      }
	      
        cluster.markers.length = 0;
        cluster.markerCount = 0;
    
        if ( cluster == this.poppedUpCluster )
	        this.map.closeInfoWindow();
    
        if ( cluster.onMap )
	      {
	        this.map.removeOverlay( cluster.marker );
	        cluster.onMap = false;
	      }
    };

// This returns a function closure that calls the given routine with the specified arg.
Clusterer.MakeCaller = function ( func, arg ) { return function () { func( arg ); }; };

// Augment GMarker so it handles markers that have been created but not yet addOverlayed.
GMarker.prototype.setMap = function ( map ) { this.map = map; };

GMarker.prototype.addedToMap = function () { this.map = null; };

GMarker.prototype.origOpenInfoWindow = GMarker.prototype.openInfoWindow;
GMarker.prototype.openInfoWindow = function ( node, opts )
    {
      if ( this.map != null )
	      return this.map.openInfoWindow( this.getPoint(), node, opts );
      else
	      return this.origOpenInfoWindow( node, opts );
    };

GMarker.prototype.origOpenInfoWindowHtml = GMarker.prototype.openInfoWindowHtml;
GMarker.prototype.openInfoWindowHtml = function ( html, opts )
    {
      if ( this.map != null )
	      return this.map.openInfoWindowHtml( this.getPoint(), html, opts );
      else
	      return this.origOpenInfoWindowHtml( html, opts );
    };

GMarker.prototype.origOpenInfoWindowTabs = GMarker.prototype.openInfoWindowTabs;
GMarker.prototype.openInfoWindowTabs = function ( tabNodes, opts )
    {
      if ( this.map != null )
	      return this.map.openInfoWindowTabs( this.getPoint(), tabNodes, opts );
      else
	      return this.origOpenInfoWindowTabs( tabNodes, opts );
    };

GMarker.prototype.origOpenInfoWindowTabsHtml = GMarker.prototype.openInfoWindowTabsHtml;
GMarker.prototype.openInfoWindowTabsHtml = function ( tabHtmls, opts )
    {
      if ( this.map != null )
	      return this.map.openInfoWindowTabsHtml( this.getPoint(), tabHtmls, opts );
      else
	      return this.origOpenInfoWindowTabsHtml( tabHtmls, opts );
    };

GMarker.prototype.origShowMapBlowup = GMarker.prototype.showMapBlowup;
GMarker.prototype.showMapBlowup = function ( opts )
    {
      if ( this.map != null )
	      return this.map.showMapBlowup( this.getPoint(), opts );
      else
	      return this.origShowMapBlowup( opts );
    };