var DEG2RAD=0.0174532922519943;
var PI=3.14159267;


function GK4(x,y) {
  this.x = x; //Hochwert
  this.y = y; //Rechtswert
}

function LatLng2GK4(lat,lng)
{
  // lat = Breite, lon = Länge
  // sy = Zielsystemnummer (Meridiankennziffer)
  var e2 = 0.0067192188;
  var c = 6398786.849;
  var sy = 4;
  
  var bf = lat /  (180/PI);
  var g = 111120.61962 * lat - 15988.63853 * Math.sin(2*bf) + 16.72995 * Math.sin(4*bf) - 0.02178 * Math.sin(6*bf) + 0.00003 * Math.sin(8*bf);
  var co = Math.cos(bf);
  var g2 = e2 * (co * co);
  var g1 = c / Math.sqrt(1+g2);
  var t = Math.sin(bf) / Math.cos(bf); 
  var dl = lng - sy * 3;
  var fa = co * dl / (180/PI);
  var y = g + fa * fa * t * g1 / 2 + fa * fa * fa * fa * t * g1 * (5 - t * t + 9 * g2) / 24;
  var rm = fa * g1 + fa * fa * fa * g1 * (1 - t * t + g2) / 6 + fa * fa * fa * fa * fa * g1 * (5 - 18 * t * t * t * t * t * t) / 120;
  var x = rm + sy * 1000000 + 500000;
  return new GK4(x+110,y+100);
}

function myLatLng2GK4(lat,lng)
{
  // lat = Breite, lon = Länge
  var B = lat * DEG2RAD;
  var L = (lng-12.0) * DEG2RAD;

  // Bessel
  //var aa = 6377397.155;
  //var bb = 6356078.96282;

  // WGS-84
  var aa = 6378137.0;
  var bb = 6356752.31424;

  var eps = Math.sqrt(aa*aa-bb*bb);
  var e = eps/aa;

  var W = Math.sqrt(1.0 - e*e*Math.sin(B)*Math.sin(B));
  var N = aa/W;

  var x = N*Math.cos(B)*Math.cos(L);
  var y = N*Math.cos(B)*Math.sin(L);

  return new GK4(x,y + 4500000);
}

CustomGetTileUrl=function(a,b,c) {

  if(this.layers=="TK50" && (b<13)) {
    return "";
  }
  if(this.layers=="TK50" && (b>16)) {
    return "";
  }
  if(this.layers=="UK500" && (b<10)) {
    return "";
  }
  if(this.layers=="UK500" && (b>12)) {
    return "";
  }

  //Bbox LatLong
  if (typeof(window['this.myStyles'])=="undefined") this.myStyles="";
  var lULP = new GPoint(a.x*256,(a.y+1)*256);
  var lLRP = new GPoint((a.x+1)*256,a.y*256);
  var lUL = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lULP,b,c);
  var lLR = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lLRP,b,c);

  var cc = this.mymap.getCenter();

  //Rotationswinkel im Kartenzentrum ermitteln
  var gkcc = LatLng2GK4(cc.y,cc.x);
  var gkcc2 = LatLng2GK4(cc.y,cc.x+0.00001);
  var dx = gkcc2.x-gkcc.x;
  var dy = gkcc2.y-gkcc.y;
  var rot = Math.atan(dy/dx); 
  rot = rot - 0.5*DEG2RAD; // Korrektur 
  var COS_PHI=Math.cos(rot); 
  var SIN_PHI=Math.sin(rot);

  //BBox um Zentrum der Karte rotieren (Lageanpassung an Gauß-Krüger)
  var rx = (lUL.x - cc.x);
  var ry = (lUL.y - cc.y);
  lUL.x = COS_PHI*rx + SIN_PHI*ry + cc.x;
  lUL.y = - SIN_PHI*rx + COS_PHI*ry + cc.y;
  rx = (lLR.x - cc.x);
  ry = (lLR.y - cc.y);
  lLR.x = COS_PHI*rx + SIN_PHI*ry + cc.x;
  lLR.y = - SIN_PHI*rx + COS_PHI*ry + cc.y;

  //Bbox von LatLng nach GK4 transformieren
  var lUL_GK = LatLng2GK4(lUL.y, lUL.x);
  var lLR_GK = LatLng2GK4(lLR.y, lLR.x);
//  document.write(lUL.x+", "+lUL.y+" -> " + lUL_GK.x + ", " + lUL_GK.y + "<br>");
  var lBbox=lUL_GK.x+","+lUL_GK.y+","+lLR_GK.x+","+lLR_GK.y;
  
        if (this.transparent != "TRUE") {this.transparent = "FALSE"; }

	var lURL=this.baseurl;
	lURL+="&REQUEST=GetMap";
	lURL+="&SERVICE=WMS";
	lURL+="&VERSION=1.1.1";
	lURL+="&LAYERS="+this.layers;
	lURL+="&STYLES="+this.myStyles;
	lURL+="&FORMAT=image/png";
	lURL+="&BGCOLOR=0xFFFFFF";
	lURL+="&TRANSPARENT="+this.transparent;
	lURL+="&SRS=EPSG:31468";
	lURL+="&BBOX="+lBbox;
	lURL+="&reaspect=false";
        if (this.resample=="ON") {
	  lURL+="&WIDTH=512";
	  lURL+="&HEIGHT=512";
          lURL="http://www.waidlerwiki.de/resize.php?url=" + escape(lURL);
        } else {
	  lURL+="&WIDTH=256";
	  lURL+="&HEIGHT=256";
        }
	return lURL;
}

CustomGetTileUrlEPSG4326=function(a,b,c) {

  //Bbox LatLong
  if (typeof(window['this.myStyles'])=="undefined") this.myStyles="";
  var lULP = new GPoint(a.x*256,(a.y+1)*256);
  var lLRP = new GPoint((a.x+1)*256,a.y*256);
  var lUL = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lULP,b,c);
  var lLR = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lLRP,b,c);
  var lBbox=lUL.x+","+lUL.y+","+lLR.x+","+lLR.y;

        if (this.transparent != "TRUE") {this.transparent = "FALSE"; }

	var lURL=this.baseurl;
	lURL+="&REQUEST=GetMap";
	lURL+="&SERVICE=WMS";
	lURL+="&VERSION=1.1.1";
	lURL+="&LAYERS="+this.layers;
	lURL+="&STYLES="+this.myStyles;
	lURL+="&FORMAT=image/png";
	lURL+="&BGCOLOR=0xFFFFFF";
	lURL+="&TRANSPARENT="+this.transparent;
	lURL+="&SRS=EPSG:4326";
	lURL+="&BBOX="+lBbox;
	lURL+="&reaspect=false";
        if (this.resample=="ON") {
	  lURL+="&WIDTH=512";
	  lURL+="&HEIGHT=512";
          lURL="http://www.waidlerwiki.de/resize.php?url=" + escape(lURL);
        } else {
	  lURL+="&WIDTH=400";
	  lURL+="&HEIGHT=400";
        }
//        document.write(lURL + "<br/>");
	return lURL;
}

function customOpacity() { return this.myOpacity; }