path: root/map.js

//tool to update dataase: display markers and edit positions
//http://docs.jquery.com/Ajax/jQuery.getJSON#urldatacallback
//nb in google maps it says "DIT" in the middle of the provost's stables
/*
showPlaces(type)
showPlace(index)



*/
//------------------------------------------------------------------------globals
var http = getHTTPObject(); //old ajax method
var markers=[];
var markertypes=['Building','Parking','Entrances']; //--lat/lng based tables to create markers
var tables=[];
var tablenames=['AZ','Lecture_theatres','Pacr','Libraries','Loops','Enabled_toilets']; //--tables reference building table
var tablescreennames={'Lecture_theatres':"Lecture theatres",'Pacr':"Public access computer rooms",'Libraries':"Libraries",'Loops':"Hearing aid looops",'Enabled_toilets':"Enabled toilets"};
var icontypes=['Loops','Enabled_toilets'];
var places=[];
var placetypes=new Array('Lecture_theatres','Libraries','Pacr');
var screenplacetypes=new Array('Lecture theatres','Libraries','Public access computer rooms');
for (i=0;i<placetypes.length;i++) { 
	places[placetypes[i]]=[];
	places[placetypes[i]].screenname=screenplacetypes[i];
}
var popularplaces=[56,59,198];
var popularnames=["Old Library","Campanile","Samuel Beckett Theatre"];
var mainCampus=new G.LatLngBounds(new G.LatLng(53.34,-6.26),new G.LatLng(53.346,-6.2499));
var show_parking_warning=true;
var InfoWindow; //points to created infowindows

var directionsService;
var directionsDisplay;

var do_menu_flag = false;
//------------------------------------------------------------------------classes
function place(name,building,info) {
	//represents an entity that can appear in a menu
	this.name=name;
	this.building=building;
	this.info=info;
}
//------------------------------------------------------------------------startup
//NB alert doesn't work within a jquery callback but console.log does
function onLoad() {
	if(document.getElementById("map")) {
		var mapOptions = {
			center: STARTPOS,
			zoom: 17,
			mapTypeId: google.maps.MapTypeId.ROADMAP
		};
		map = new G.Map(document.getElementById("map"),mapOptions);
		directionsService = new G.DirectionsService();
		directionsDisplay = new G.DirectionsRenderer({Map:map});
		//load data via ajax - chaining other loading functions
		loadTables(tablenames); 
		
	}
}
function loadTables(t) {
	t.forEach(function(table) {
		$.getJSON("./loadTable.php","table="+table,function(d) {
			$.each(d, function(idx,v) {
				tables[idx]=[];
				for (i in v) {
					tables[idx].push(v[i]);
				}
				if (DEBUG) console.log("loaded table "+Object.keys(tables).length+":"+idx+","+tables[idx].length+" items");
				if (Object.keys(tables).length==tablenames.length) loadMarkers(markertypes); 
			});
		});
	});
}
//how to know when everything is loaded via ajax and data can be processed
function loadMarkers(m) { //---------build customised markers from a database table
	m.forEach(function(marker) {
		$.getJSON("./loadTable.php","table="+marker,function(d) { 
			$.each(d, function(idx,v) {
				markers[idx]=[];
				for (i in v) {
					markers[idx][i]=makeMarker(v[i],idx);
					//console.log("making "+i+": "+
				}
				markers[idx].visible=false;
				if (DEBUG) console.log("loaded markers "+Object.keys(markers).length+":"+idx+","+markers[idx].length+" items");
				if (Object.keys(markers).length==markertypes.length) {
					prepareData();
					do_menuchoices();
					console.log("search:"+search_posted);
					if (search_posted!="") onsearch(search_posted);
				}
			});
		});
	});
}
function makeMarker(data,type) {
	if (DEBUG) console.log(type+":"+data['lat']+","+data['lng']); //alert doesn't work within a jquery callback but console.log does
	var m=new G.Marker({position:new G.LatLng(data['lat'],data['lng']),map:null,draggable:EDITABLE});
	m["type"]=type;
	for (j in data) m[j]=data[j];
	m.places=[];
	m.tabVisible=false;
	m.visible=false;
	if (EDITABLE){
		G.event.addListener(m,"dragend",setMarkerPosition);
		G.event.addListener(m,"click",displayMarkerInfo);
		if (type=="Building"&&m.google_coords==1) {
			m.setIcon(new G.MarkerImage("http://maps.google.com/mapfiles/marker_orange.png"));
		}
	}
	switch (type) {
		case "Parking":
			m.setIcon(new G.MarkerImage("img/marker_parking.png"));
			break;
		case 'Entrances':
			m.setIcon(new G.MarkerImage("img/marker_entrance.png"));
			break;
		case 'Loops':
			m.setIcon(new G.MarkerImage("img/marker_loop.png"));
			break;
		case 'Enabled_toilets':
			m.setIcon(new G.MarkerImage("img/marker_accessible_toilet.png"));
			break;
		case 'Ramps':
			m.setIcon(new G.MarkerImage("img/marker_ramp.png"));
			break;
		default:
			break;
	}
	m.setShadow(new G.MarkerImage("img/marker_shadow.png",new G.Size(30,30),new G.Point(0,0),new G.Point(6,29)));
	if (type=="Building") {
		m.sortPlaces=function() {m.places.sort(function(a,b) {if (a.name<b.name) return -1; else return 1; }); }
		m.show = function (tab){
			if (!this.visible) {
				this.dispphoto=httpexists("./photos/small/"+this.id+".jpg");
				if (this.places.length>1||this.description) { //multi-tab
					this.showtab = function() {
						purgeInfoWindow();
						InfoWindow=new InfoBubble({disableAnimation:true});
						InfoWindow.addTab('Building',this.getPlacesTab());
						InfoWindow.addTab('More',this.getInfoTab());
						InfoWindow.open(map,this);
						this.tabVisible=true;
					}
				} //single tab
				else {
					this.showtab = function() {
					purgeInfoWindow();
					InfoWindow=new InfoBubble({content:this.getPlacesTab(),disableAnimation:true});;
					InfoWindow.open(map,this);
					this.tabVisible=true;
					}
				}
				G.event.addListener(this,"click",this.showtab);
				this.setMap(map);
				var boundscheck=map.getBounds();
				if ((!boundscheck.contains(this.getPosition()))&&this.type=="Building") //only zoom to accomodate buildings
				{
					boundscheck.extend(this.getPosition());
					var newzoom = getZoomByBounds( map, boundscheck );
					map.setZoom(newzoom);
					map.setCenter(boundscheck.getCenter());
				
				}
				this.visible=true;
			}
			if (tab) this.showtab();
		}
	}
	if (type=="Entrances") { //construct tabs
		m.show = function (tab){
			this.showtab = function() {
				purgeInfoWindow();
				InfoWindow=new InfoBubble({content:this.getEntranceTab(),disableAnimation:true});
				InfoWindow.open(map,this);
				this.tabVisible=true;
			}
			G.event.addListener(this,"click",this.showtab);
			this.setMap(map);
			var boundscheck=map.getBounds();
			if ((!boundscheck.contains(this.getPosition()))&&this.type=="Building") //only zoom to accomodate buildings
			{
				boundscheck.extend(this.getPosition());
				var newzoom = getZoomByBounds( map, boundscheck );
				if (newzoom<15) map.setMapType(G_NORMAL_MAP);
				map.setZoom(newzoom);
				map.setCenter(boundscheck.getCenter());
			}
			this.visible=true;
			if (tab) this.showtab();
		}
	}
	if (type=="Enabled_toilets") { //construct tabs
		m.show = function (tab){
			if (this.data !="") {
				this.showtab = function() {
					purgeInfoWindow();
					InfoWindow=new InfoBubble({content:this.getToiletTab(),disableAnimation:true});
					InfoWindow.open(map,this);
					this.tabVisible=true;
				}
			}
			G.event.addListener(this,"click",this.showtab);
			this.setMap(map);
			var boundscheck=map.getBounds();
			if ((!boundscheck.contains(this.getPosition()))&&this.type=="Building") //only zoom to accomodate buildings
			{
				boundscheck.extend(this.getPosition());
				var newzoom = getZoomByBounds( map, boundscheck );
				if (newzoom<15) map.setMapType(G_NORMAL_MAP);
				map.setZoom(newzoom);
				map.setCenter(boundscheck.getCenter());
			}
			this.visible=true;
			if (tab) this.showtab();
		}
	}
	if (type=="Loops"||type=="Parking") {
		m.show = function (tab){
			this.setMap(map);
			var boundscheck=map.getBounds();
			if ((!boundscheck.contains(this.getPosition()))&&this.type=="Building") //only zoom to accomodate buildings
			{
				boundscheck.extend(this.getPosition());
				var newzoom = getZoomByBounds( map, boundscheck );
				if (newzoom<15) map.setMapType(G_NORMAL_MAP);
				map.setZoom(newzoom);
				map.setCenter(boundscheck.getCenter());
			}
			this.visible=true;
		}
	}
	m.hide = function() { 
		if (!(this.type=="Loops"||this.type=="Parking")) {
			G.event.clearListeners(this,"click");
		}
		if (this.tabVisible) {
			purgeInfoWindow();
			this.tabVisible=false;
		}
		this.visible=false;
		this.setMap(null); 
	}
	m.getPlacesTab=getPlacesTab;
	m.getInfoTab=getInfoTab;
	m.getEntranceTab=getEntranceTab;
	m.getToiletTab=getToiletTab;
	return m;
}
//----------------------------------------------------------------------------------functions to populate tabs called from marker
function getPlacesTab() {
	var popup="<div id='map_building'><h4>"+this.name+"</h4>";
	popup+="<div id='map_building_inner'>";
	if (this.dispphoto) {
			popup+="<div id='map_building_photo'>";
			popup+="<a href='javascript:shadowbox("+this.id+")'><img src='./photos/small/"+this.id+".jpg' style='display:block'; width='40%'; height='40%'></a>"; 
			popup+="</div>";
		}
	if (this.opening_hours) {
		popup+="<div id='map_building_opening_hours'>";
		popup +='<h5>Building Opening Hours:</h5>';
		popup +='<div>'+this.opening_hours+"</div>";
		popup+="</div>";
	}
	if ((this.accessibility)||(this.accessibility_url)) {
		popup+="<div id='map_building_access'>";
		if (this.accessibility) {
			popup+="<h5>Accessibility: </h5><div>"+this.accessibility+" ";
			if (this.accessibility_url) popup+="(<a href='http://www.tcd.ie/disability/accessibility/Building-check/"+this.accessibility_url+"'>more&nbsp;info</a>)</div>";
		
		}
		else if (this.accessibility_url) popup+="<div><a href='http://www.tcd.ie/disability/accessibility/Building-check/"+this.accessibility_url+"'>Accessibility&nbsp;info</a></div>";
		popup+="</div>";
	}
	popup+="</div>";
	
	popup+="<div id='map_building_permalink'>";
	var linkname;
	linkname=this.name;
	popup+="<a href='map.php?q="+urlencode(linkname)+"' >Permalink</a>";
	lat=this.getPosition().lat();
	lng=this.getPosition().lng();
	
	if (!mainCampus.contains(this.getPosition())) {
		bd='"'+urlencode(this.name)+'"';
		popup+="    <a href='javascript:directions("+lat+","+lng+","+bd+")'>Directions</a> ";
	}
	popup+="</div>";

	return popup;
}
function getInfoTab() {
	popup="";
	popup+="<div id='map_info'>";
	popup+="<div id='map_info_inner'><bd>"; //<div id='map_popup_inner'>";
	var placeoffset=0;
	if (this.places.length-placeoffset) {
		popup+="<h4>Also in this building</h4><ul>";
		for (i=0;i<this.places.length;i++) {
			if (this.places[i].name) {
				if (this.places[i].info.match(/^\s*http/)) {
					popup +="<li><a href='"+this.places[i].info+"'>"+this.places[i].name+"</a></li>";
				}
				else {
					popup +="<li>"+this.places[i].name+"</li>";
				}
			}
		}
		popup+="</ul>";
	}
	if (this.description)  popup+="<h4>Info</h4>"+this.description;
	popup+="</bd></div></div>";
	return popup;
}
function getToiletTab() {
	popup="";
	popup+="<div id='map_toilettab'>";
	popup+="<div id='map_toilettab_inner'><bd>"; 
	popup+="<h4>Enabled toilet</h4>"
	popup+="<br>"+this.data;
	popup+="</bd></div></div>";
	return popup;
}
function getEntranceTab() {
	popup="";
	popup+="<div id='map_entrancetab'>";
	popup+="<div id='map_entrancetab_inner'><bd>"; 
	popup+="<h4>Entrance</h4>"
	popup+="<br> "+this.data;
	popup+="</bd></div></div>"; 
	return popup;
}
//----------------------------------------------------------------------------------Setting up data structures while loading
function prepareData() {
	//create markers for ref tables
	for (i in icontypes) {
		markers[icontypes[i]]=[];
		for (t in tables[icontypes[i]]) {
			//console.log("building  "+tables[icontypes[i]][t].building+":"+markers["Building"][tables[icontypes[i]][t].building].name);
			tables[icontypes[i]][t].lat=markers["Building"][tables[icontypes[i]][t].building].lat;
			tables[icontypes[i]][t].lng=markers["Building"][tables[icontypes[i]][t].building].lng;
			tables[icontypes[i]][t].id=tables[icontypes[i]][t].building;
			markers[icontypes[i]].push(makeMarker(tables[icontypes[i]][t],icontypes[i]));
		}

		markers[icontypes[i]].visible=false;
	}
	//process Building and AZ tables
	//create AZ -- is causing problems now for some reason WHERE THERE ARE NO ITEMS
	for (var i=0;i<26;i++) {
		tables[String.fromCharCode(i+65)]=[];
		tables[String.fromCharCode(i+65)].screenname=String.fromCharCode(i+65);
	}
	//Create alphabetical lists of places including exceptions
	for (var i=0;i<tables["AZ"].length;i++)
	{
		if (tables["AZ"][i].info=="") tables["AZ"][i].info=tables["AZ"][i].name;
		
		 var j=0;
		 var startlet=0;
		 
		 while (tables["AZ"][i].name.charCodeAt(j) <64) j++; //find 1st non-number
		 
		 startlet=tables["AZ"][i].name.charCodeAt(j) -65; 
		 if (startlet>25) startlet-=32; //select small letters (which shouldn't even be there)
		 
		 if ((startlet==96)||(startlet==128)) startlet=0; //catch Á
		 if (startlet==104) startlet=4; //catch É
		 if (startlet==108) startlet=8; //catch Í
		 
		 //find array number of building index as buildingindex number can be non-consecutive
		 var bb=tables["AZ"][i].building;
		 for (j in markers['Building'])
		 {
		 	if (markers['Building'][j].id==bb) {
				numplaces=tables[String.fromCharCode(startlet+65)].length;
				tables[String.fromCharCode(startlet+65)].push(tables["AZ"][i]); //add reference to place
				tables[String.fromCharCode(startlet+65)][numplaces].building=j; //resolve reference to building array
				tables[String.fromCharCode(startlet+65)][numplaces].index=i; //resolve reference to AZ array
				markers['Building'][j].places.push(tables["AZ"][i]);
			}
		 }
		 
		 if (tables["AZ"][i].name.slice(0,3)=="St.")
		 {
			 startlet=tables["AZ"][i].name.charCodeAt(4) -65;
			 if (startlet>25) startlet-=32; //select small letters
			 //we know its doesn't start with ÁÉÍ
			 for (j in markers['Building'])
			 {
				if (markers['Building'][j].id==bb) {
					numplaces=tables[String.fromCharCode(startlet+65)].length;
					tables[String.fromCharCode(startlet+65)].push(tables["AZ"][i]); //add reference to place
					tables[String.fromCharCode(startlet+65)][numplaces].building=j; //resolve reference to building array
					markers['Building'][j].places.push(tables["AZ"][i]);
				}
			 }
		 }
	}
	//add buildings
	for (i in markers['Building'])
	{
		if (markers['Building'][i].name) { //trap added 'visible' property
			var j=0;
			 var startlet=0;
			 
			 while (markers['Building'][i].name.charCodeAt(j) <64) j++; //find 1st non-number
			 
			 startlet=markers['Building'][i].name.charCodeAt(j) -65; 
			 if (startlet>25) startlet-=32; //select small letters (which shouldn't even be there)
			 
			 if ((startlet==96)||(startlet==128)) startlet=0; //catch Á
			 if (startlet==104) startlet=4; //catch É
			 if (startlet==108) startlet=8; //catch Í
			 
			 numplaces=tables[String.fromCharCode(startlet+65)].length;
			 tables[String.fromCharCode(startlet+65)].push(new place(markers['Building'][i].name,i,markers['Building'][i].info));
			 tables[String.fromCharCode(startlet+65)][numplaces].building=i; //resolve reference to building array
		}
					
	}
	//sort results alphabetically
	for (i=0;i<26;i++) {
		letter=String.fromCharCode(i+65);
		tables[letter].sort(function(a,b) { if (a.name<b.name) return -1; else return 1;});
	}
	//resolve other tables references
	places.forEach(function(placetable) {
		for (j=0;j<placetable.length;j++) {
			for (k=0; k<markers['Building'].length;k++)
			if (placetable[j].building==markers['Building'][k].num) {
				placetable[j].building=k; //resolve reference to building array
				break;
			}
		}
		placetable.sort(function(a,b) {if (a.name<b.name) return -1; else return 1; });
		
	});
	//create html popups
	for (i in markers['Building']) {
		if (markers['Building'][i].name) {
			markers['Building'][i].sortPlaces();
		}
	}
	for (t in tables) tables[t].screenname=tablescreennames[t];
}
function do_menuchoices() {
	var menu="<ul>";
	for (var i=0;i<26;i++) {
		letter=String.fromCharCode(i+65);
		menu+="<li><a href='javascript:do_menu(\""+letter+"\");'>"+letter+" </a></li>"; 
	}
	menu+="</ul>";
	document.getElementById("searchoptions").innerHTML=menu;
	//action='map.php' 
	menu="<form id='form' method='POST' action='javascript:void(0);' onsubmit='quicklink(this.childNodes[0].childNodes[1]);return false'><div><label for='quicklinks'>Quicklinks: </label><select name='quicklinks' id='quicklinks'><option selected='selected'>Search for lectures, libraries, pacr...</option>";
	for (i=0;i<placetypes.length;i++) menu+="<option value='"+placetypes[i]+"'>"+screenplacetypes[i]+"</option>";
	menu+="</select> <input type='submit' value='Go' /></form>";
	document.getElementById("quicklinkswrap").innerHTML=menu;
}
//----------------------------------------------------------------------------------Editing markers while authoring
function setMarkerPosition() {
	if (this.type=="Building") {
		$.ajax({ 
			url:"setMarkerPos.php",
			data: "table="+this.type+"&id="+this.id+"&lat="+this.getPosition().lat()+"&lng="+this.getPosition().lng()+"&google_coords=1"
		});
		this.setIcon(new G.MarkerImage("http://maps.google.com/mapfiles/marker_orange.png") );
	}
	else {
		$.ajax({ 
			url:"setMarkerPos.php",
			data: "table="+this.type+"&id="+this.id+"&lat="+this.getPosition().lat()+"&lng="+this.getPosition().lng()
		});
	}
}
function displayMarkerInfo(){
	if (this.type=="Building")  document.getElementById("info").innerHTML=this.id+": "+this.name;
	else document.getElementById("info").innerHTML=this.id;
}
//----------------------------------------------------------------------------------Interaction handlers
function shadowbox(n) {
	Shadowbox.open({content:"./photos/"+n+".jpg",player: "img",title:markers['Building'][n].name});
}
function onsearch(query) {
	tables["search"]=[];
	var foundbuildings=new Array();
	fb=0;
	for (var i=0;i<26;i++) {
		//console.log("checking "+String.fromCharCode(i+65));
		for (j in tables[String.fromCharCode(i+65)]) {
			
			
			if (tables[String.fromCharCode(i+65)][j]!=undefined) {
			//console.log("checking "+j+": "+tables[String.fromCharCode(i+65)][j].name);
				
				if ("name" in tables[String.fromCharCode(i+65)][j]) {
					if (tables[String.fromCharCode(i+65)][j].name.toLowerCase().indexOf(query.toLowerCase())>-1) {
						tables["search"].push(tables[String.fromCharCode(i+65)][j]);
						if (foundbuildings[tables[String.fromCharCode(i+65)][j].building]!="1") fb++;
						foundbuildings[tables[String.fromCharCode(i+65)][j].building]="1";
					}
				}
				
			}
			
		}
	}
	//auto-open if 1 search result
	if (fb==1) {
		clearmarkers();
		markers["Building"][tables["search"][0].building].show(true,tables["search"][0]);
	}
	tables["search"].screenname=query;
	tables["search"].sort(function(a,b) {if (a.name<b.name) return -1; else return 1; });
	do_menu("search");
}
function show_markers(type) {
	if (DEBUG) console.log("showing "+type);
	if (!markers[type].visible) {
		for(i in markers[type]) {
			if (markers[type][i].id) {
				markers[type][i].show();
			}
		}
	}
	else {
		for(i in markers[type]) {
			if (markers[type][i].id) {
				markers[type][i].hide();
			}
		}
	}

	markers[type].visible=!markers[type].visible;
}
function show_place(type,index) {
	show_building(tables[type][index].building);
}
function show_building(index) { //funnel through here
	markers['Building'][index].show(true);
}
function quicklink(owner) {
	name=owner.options[owner.selectedIndex].value;
	for (i=1;i<markertypes.length;i++) if (name==markertypes[i]) show_markers(name);
	for (i=0;i<placetypes.length;i++) if (name==placetypes[i]) do_menu(name);
	resize_map_and_results();
}
function do_menu(type) {
	var title="<h1>"+tables[type].length+" results for ";
	if (type.length==1) title+="letter ";
	if (tables[type].screenname) {
		title+=tables[type].screenname;
	}
	else {
		title+=type;
	}
	title+="</h1>";
	if (DEBUG) console.log("doing menu: "+type);
	if (DEBUG) console.log(tables[type].length+" items");
	if(document.getElementById("searchresulttitle")) {
		document.getElementById("searchresulttitle").innerHTML=title;
		var content="<ul>";
		for(var i=0;i<tables[type].length;i++) {
			content+="<li><a href='javascript:show_place(\""+type+"\","+i+"); '>"+tables[type][i].name+"</a></li>";
		}
		content+="</ul>";
		document.getElementById("searchresults").innerHTML=content;
		if(do_menu_flag) {
			resize_map_and_results();
		}
		else {
			do_menu_flag = true;
		}
		if (DEBUG) alert(content);
	}
}
function purgeInfoWindow() {
	if (InfoWindow) {
		//console.log("closing infowindow");
		InfoWindow.close();
		InfoWindow=undefined;
	}
}
function clearmarkers() {
	for (i in markers) { 
		for (j in markers[i]) {
			if (markers[i][j].name) markers[i][j].hide;
		}
	}
}
function directions(lat,lng,place){
	document.getElementById("searchresulttitle").innerHTML="<h1>From Trinity College to "+place+"</h1>";
	document.getElementById("searchresults").innerHTML="";
	var request = {
            origin:new G.LatLng(53.3445,-6.259),
            destination:new G.LatLng(lat,lng),
            travelMode: google.maps.DirectionsTravelMode.DRIVING
        };
	directionsDisplay.setPanel(document.getElementById("searchresults"));
	directionsService.route(request, function(response, status) {
          if (status == G.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
          }
        });
}
//----------------------------------------------------------------------------------misc utils, legacy ajax stuff to bypass TCD fuzzy filename filter
//Equivalent of getBoundsZoomLevel() in gmaps api 3
/**
* Returns the zoom level at which the given rectangular region fits in the map view. 
* The zoom level is computed for the currently selected map type. 
* @param {google.maps.Map} map
* @param {google.maps.LatLngBounds} bounds 
* @return {Number} zoom level
**/
function getZoomByBounds( map, bounds ){
  var MAX_ZOOM = map.mapTypes.get( map.getMapTypeId() ).maxZoom || 21 ;
  var MIN_ZOOM = map.mapTypes.get( map.getMapTypeId() ).minZoom || 0 ;

  var ne= map.getProjection().fromLatLngToPoint( bounds.getNorthEast() );
  var sw= map.getProjection().fromLatLngToPoint( bounds.getSouthWest() ); 

  var worldCoordWidth = Math.abs(ne.x-sw.x);
  var worldCoordHeight = Math.abs(ne.y-sw.y);

  //Fit padding in pixels 
  var FIT_PAD = 40;

  for( var zoom = MAX_ZOOM; zoom >= MIN_ZOOM; --zoom ){ 
      if( worldCoordWidth*(1<<zoom)+2*FIT_PAD < $(map.getDiv()).width() && 
          worldCoordHeight*(1<<zoom)+2*FIT_PAD < $(map.getDiv()).height() )
          return zoom;
  }
  return 0;
}
function urlencode (string) {
       string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }
 
        return escape(utftext);
}
function httpexists(url) {
	exists=false;
	http.open("GET",'httpexists-proxy.php?httpexistsurl=' + url, false);
	//http.open("GET", url, false);
	http.send(null);
	if (http.status == 200) {
		exists=true;
	}
	return exists;
}
function getHTTPObject() {
  var xmlhttp;
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}