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));
}

var CustomGetTileUrl = function(a, b, c) {
    if (typeof (window['this.myMercZoomLevel']) == "undefined") this.myMercZoomLevel = 0;
    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);
    // switch between Mercator and DD if merczoomlevel is set
    if (this.myMercZoomLevel != 0 && map.getZoom() < this.myMercZoomLevel) {
        var lBbox = dd2MercMetersLng(lUL.lngDegrees) + "," + dd2MercMetersLat(lUL.latDegrees) + "," + dd2MercMetersLng(lLR.lngDegrees) + "," + dd2MercMetersLat(lLR.latDegrees);
        var lSRS = "EPSG:54004";
    } else {
        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=" + this.myVersion;
    lURL += "&LAYERS=" + this.myLayers;
    lURL += "&STYLES=" + this.myStyles;
    lURL += "&FORMAT=" + this.myFormat;
    lURL += "&BGCOLOR=" + this.myBgColor;
    lURL += "&TRANSPARENT=TRUE";
    lURL += "&SRS=" + lSRS;
    lURL += "&BBOX=" + lBbox;
    lURL += "&WIDTH=256";
    lURL += "&HEIGHT=256";
    lURL += "&reaspect=false";
    return lURL;
    ;
}

function createWMSSpec(wmsURL, gName, gShortName, zoomin, zoomout, wmsLayers, wmsStyles, wmsFormat, wmsVersion, wmsBgColor, wmsSrs) {
    var copy=new GCopyrightCollection("Mapa");
    copy.addCopyright(new GCopyright(1,new GLatLngBounds(new GLatLng(-90, -180),new GLatLng(90, 180)),0,"<a href=\"http://www.geoportal.gov.pl/\">www.geoportal.gov.pl</a>"));    
    
    var tile = new GTileLayer(copy, zoomin, zoomout);

    tile.myLayers = wmsLayers;
    tile.myStyles = (wmsStyles ? wmsStyles : "");
    ;
    tile.myFormat = (wmsFormat ? wmsFormat : "image/gif");
    ;
    tile.myVersion = (wmsVersion ? wmsVersion : "1.1.1");
    tile.myBgColor = (wmsBgColor ? wmsBgColor : "0xFFFFFF");
    tile.myBaseURL = wmsURL;
    tile.getTileUrl = CustomGetTileUrl;

    var layer = [tile];

    var mapType = new GMapType(layer, G_SATELLITE_MAP.getProjection(), gName, G_SATELLITE_MAP);

    return mapType;
}

/** Create transparent WMS overlay layer on standard GMap Spec. */
function createWMSOverlaySpec(gSpec, wmsSpec, gName, gShortName) {
    wmsSpec.getTileLayers()[0].getOpacity = function() {
        return 1.0;
    }
    var layers = [gSpec.getTileLayers()[0], wmsSpec.getTileLayers()[0]];
    return new GMapType(layers, gSpec.getProjection(), gShortName);

}