/*
 * wms-gs-1_0_1.js V1.1.9
 * 为GMap API v2实现调用WMS的方法
 */

var MAGIC_NUMBER = 6356752.3142;
var DEG2RAD = 0.0174532922519943;
var PI = 3.14159267;

var FORMAT_DEFAULT = "image/png";

var MERC_ZOOM_DEFAULT = 5;
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 (this.myMercZoomLevel == undefined) {
		this.myMercZoomLevel = MERC_ZOOM_DEFAULT;
	}

	if (this.myFormat == undefined) {
		this.myFormat = FORMAT_DEFAULT;
	}

	if (this.myMapname == undefined) {
		this.myMapname = "map";
	}
	
	if (this.myBgColor == undefined) {
		this.myBgColor = "0xFFFFFF";
	}
	
	if (this.myMapIsTrans == undefined) {
		this.myMapIsTrans = "TRUE";
	}
	
	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);
	
	eval("var lwz = "+ this.myMapname + ".getZoom()");
	if (this.myMercZoomLevel!=0 && lwz < this.myMercZoomLevel) {
		var lBbox=dd2MercMetersLng(lUL.x)+","+dd2MercMetersLat(lUL.y)+","+dd2MercMetersLng(lLR.x)+","+dd2MercMetersLat(lLR.y);
		var lSRS="EPSG:41001";
	} 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=1.1.1";
	//lURL+="&LAYERS="+this.myLayers;
	//lURL+="&STYLES="+this.myStyles; 
	lURL+="&FORMAT="+this.myFormat;
	lURL+="&BGCOLOR="+this.myBgColor;
	lURL+="&TRANSPARENT="+this.myMapIsTrans;
	lURL+="&SRS="+lSRS;
	lURL+="&BBOX="+lBbox;
	lURL+="&WIDTH=256";
	lURL+="&HEIGHT=256";
	//lURL+="&REASPECT=FALSE";
	lURL+="&LEVEL="+lwz;
	if (this.myMapRoadIsWide != undefined) {
		lURL+="&WIDE="+this.myMapRoadIsWide;
	}
	if (this.myMapIsAA != undefined) {
		lURL+="&AA="+this.myMapIsAA;
	}
	return lURL;
}

function customOpacity() {
	return this.myOpacity;
}