// Creates a marker at the given point
function createMarker(point, lat, lon, image, spec_id, species, citation) 
{
	var marker = new GMarker(point);
	var new_html = '<div width="150" style="font-size:10px;width:150px;">'
	new_html += '<b>Species:</b> <em>' + species + '</em> ' + citation + '<br />';
	if(spec_id != null){ new_html += '<b>Specimen No.:</b> ' + spec_id + '<br />'; }
	new_html += '<b>Lat:</b> ' + lat +' ';
	new_html += '<b>Long:</b> ' + lon +'<br />';
	if(image != null) { new_html += '<img src="http://www.barcodingbirds.org/image_code/phpThumb.php?src=http://'+image+'&w=75" border="0" alt="Image of ' + species + '" />'; }
	new_html += '</div>';
	GEvent.addListener(marker, "click", function() {
	marker.openInfoWindowHtml(new_html);
	});
	return marker;
}

function google_map_load()
{

	if (GBrowserIsCompatible()) 
  {
	//Create new instance of Google Map
	var map = new GMap2(document.getElementById("google_map"));
	//Add small controls, up/down/left/right, zoom in/zoom out
	map.addControl(new GSmallMapControl());
	//Add random center for map
	map.setCenter(new GLatLng(0, 0), 0);
	//Set the map to Hybrid mode
	var x=map.getMapTypes();
	map.setMapType(x[2]);
	
	//create new instance of boundary markers
	var bounds = new GLatLngBounds();
	
	var col_num = 0;
	
	//Download the XML file that contains the relevant point markers for an overlay
	GDownloadUrl(siteroot + "map_markers/campaign/1/id/506", function(data, responseCode) {
	  var xml = GXml.parse(data);
	  var markers = xml.documentElement.getElementsByTagName("marker");
	  //Loop through the markes and create overlay points and set the boundary zone
	  for (var i = 0; i < markers.length; i++) {
		var bold_lat = parseFloat(markers[i].getAttribute("lat"));
		var bold_lon = parseFloat(markers[i].getAttribute("lng"));
		var species = markers[i].getAttribute("name");
		var citation = markers[i].getAttribute("citation");
		var spec_id =markers[i].getAttribute("spec_id");
		var bold_img = markers[i].getAttribute("pic");
		var point = new GLatLng(bold_lat,bold_lon);
		var marker = createMarker(point, bold_lat, bold_lon, bold_img, spec_id, species, citation);
		map.addOverlay(marker);
		bounds.extend(point);
		var zoom_lvl = map.getBoundsZoomLevel(bounds);
		if(zoom_lvl > 5){ zoom_lvl = 5; }
		map.setZoom(zoom_lvl);
		var clat = (bounds.getNorthEast().lat() + bounds.getSouthWest().lat()) /2;
		var clng = (bounds.getNorthEast().lng() + bounds.getSouthWest().lng()) /2;
		map.setCenter(new GLatLng(clat,clng));
		col_num++;
		$('col_num').innerHTML = col_num;
	  }
	});	
  }
}

Behaviour.addLoadEvent(google_map_load);