//--------------------------------------------------------------------------------
//	$Id: mouseposition_utm.js,v 1.6 2010/08/14 23:34:47 wolf Exp wolf $
//--------------------------------------------------------------------------------
//	Erklärung:	http://www.netzwolf.info/kartografie/openlayers/utm
//--------------------------------------------------------------------------------
//	Fragen, Wuensche, Bedenken, Anregungen?
//	<openlayers(%40)netzwolf.info>
//--------------------------------------------------------------------------------

OpenLayers.Control.MousePositionUTM = OpenLayers.Class (OpenLayers.Control.MousePosition, {
	formatOutput: function (lonLat) {
		if (lonLat.lat > 84.0) return "[Lattitude > 84&#176;N]";
		if (lonLat.lat <-80.0) return "[Lattitude < 80&#176;S]";
		lonLat.lon -= Math.floor(lonLat.lon/360+0.5)*360;

		//---------------------------------------------------------
		//	Bestimme Mittelmerdian
		//---------------------------------------------------------

		var zone = Math.floor (lonLat.lon/6.0) + 31;
		var meridian = zone*6 - 183;

		//---------------------------------------------------------
		//	Laenge relativ zum Mittelmeridian
		//	Uebergang auf Bogenmass
		//---------------------------------------------------------

		var rho = 180.0/3.14159265358979;
		var phi = lonLat.lat/rho;
		var lbd = (lonLat.lon-meridian)/rho;

		//---------------------------------------------------------
		//	Hilfswerte
		//	(Alle Konstanten fuer das WGS84-Ellipsoid)
		//---------------------------------------------------------

		var sin = Math.sin (phi);
		var cos = Math.cos (phi);
		var tan = Math.tan (phi);
		var c2  = cos*cos;
		var t2  = tan*tan;
		var l2  = lbd*lbd;
		var eta = 0.00673949674227643 * c2;
		var Vq  = 1 + eta;
		var V   = Math.sqrt(Vq);
		var N   = 6399593.62575849/V;

		//---------------------------------------------------------
		//	Konforme Transformation in Nord- und Ost-Wert
		//	.oO( you are not expected to understand this :-)
		//---------------------------------------------------------

        	var nv = 6367449.14582342 * phi + sin * cos *
				(((0.00403587903241357 * c2 - 0.709736085843171)
				* c2 + 135.398511127892) * c2 - 32144.4799350778)
				+ N * (0.5 * tan * c2 * l2 * (1 + 1/12 * (5+9*eta-t2)*c2*l2));;
        	var ev = N * cos * lbd * (1+ 1/6 * c2 * l2 * (Vq - t2 +0.05 * (5-18*t2+t2*t2) * c2 * l2));

		//---------------------------------------------------------
		//	Anzeige
		//---------------------------------------------------------

		return "UTM "+zone+
			"CDEFGHJKLMNPQRSTUVWXX".charAt((lonLat.lat+80)/8)+
			" "+ Math.round (0.9996*ev +   500000)+
			" "+ Math.round (0.9996*nv + 50000000).toString().substr(1);

       	},

	CLASS_NAME:"OpenLayers.Control.MousePositionUTM"

});

//--------------------------------------------------------------------------------
//	$Id: mouseposition_utm.js,v 1.6 2010/08/14 23:34:47 wolf Exp wolf $
//--------------------------------------------------------------------------------