/*
Call generic wms service for GoogleMaps v2
John Deck, UC Berkeley
Inspiration & Code from:
Mike Williams http://www.econym.demon.co.uk/googlemaps2/ V2 Reference & custommap code
Brian Flood http://www.spatialdatalogic.com/cs/blogs/brian_flood/archive/2005/07/11/39.aspx V1 WMS code
Kyle Mulka http://blog.kylemulka.com/?p=287 V1 WMS code modifications
http://search.cpan.org/src/RRWO/GPS-Lowrance-0.31/lib/Geo/Coordinates/MercatorMeters.pm
*/

var MAGIC_NUMBER=6356752.3142;
var DEG2RAD=0.0174532922519943;
var PI=3.14159267;
function dd2MercMetersLng(p_lng) {
return MAGIC_NUMBER*(p_lng*DEG2RAD);
}

function dd2MercMetersLat(p_lat) {
if (p_lat >= 85) p_lat=85;
if (p_lat <= -85) p_lat=-85;
return MAGIC_NUMBER*Math.log(Math.tan(((p_lat*DEG2RAD)+(PI/2)) /2));
}

CustomGetTileUrl=function(a,b,c) {
if (typeof(window['this.myStyles'])=="undefined")
{ 
	var ts = map.getCurrentMapType().getTileSize(); 
	
	this.myStyles="";
	var lULP = new GPoint(a.x*ts,(a.y+1)*ts);
	var lLRP = new GPoint((a.x+1)*ts,a.y*ts);
	var lUL = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lULP,b,c);
	var lLR = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lLRP,b,c);
}
// switch between Mercator and DD if merczoomlevel is set
if (this.myMercZoomLevel!=0 && map.getZoom() < this.myMercZoomLevel) 
{
	var lBbox=dd2MercMetersLng(lUL.x)+","+dd2MercMetersLat(lUL.y)+","+dd2MercMetersLng(lLR.x)+","+dd2MercMetersLat(lLR.y);
	var lSRS="EPSG:54004";
} 
else 
{
	//var lUL = G_NORMAL_MAP.getBounds().getNorthEast();
	//var lLR = G_NORMAL_MAP.getBounds().getSouthWest();
	var lBbox=lUL.x+","+lUL.y+","+lLR.x+","+lLR.y;
	var lSRS="EPSG:4326";
}

var lURL=this.myBaseURL;
lURL+="REQUEST=GetMap";
lURL+="&SERVICE=WMS";
lURL+="&VERSION=1.1.1";
lURL+="&LAYERS="+this.myLayers;
lURL+="&STYLES="+this.myStyles; 
lURL+="&FORMAT="+this.myFormat;
lURL+="&BGCOLOR=0xFFFFFF";
lURL+="&TRANSPARENT=TRUE";
lURL+="&SRS="+lSRS;
lURL+="&BBOX="+lBbox;
lURL+="&WIDTH=256";
lURL+="&HEIGHT=256";
lURL+="&reaspect=false";
//alert(lURL);
//document.getElementById("feedbackPane").innerHTML = lURL;
return lURL;
}