// Declare some variables
var centreLat=0.0;
var centreLon=0.0;
var initialZoom=1;
var imageWraps=false; //SET THIS TO false TO PREVENT THE IMAGE WRAPPING AROUND
var map; //the GMap2 itself

/////////////////////
//Custom projection
/////////////////////
function CustomProjection(a,b){
this.imageDimension=65536;
this.pixelsPerLonDegree=[];
this.pixelOrigin=[];
this.tileBounds=[];
this.tileSize=256;
	this.isWrapped=b;
var b=this.tileSize;
var c=1;
for(var d=0;d<a;d++){
	  var e=b/2;
	  this.pixelsPerLonDegree.push(b/360);
	  this.pixelOrigin.push(new GPoint(e,e));
	  this.tileBounds.push(c);
	  b*=2;
	  c*=2
	}
}

CustomProjection.prototype=new GProjection();

CustomProjection.prototype.fromLatLngToPixel=function(latlng,zoom){
	var c=Math.round(this.pixelOrigin[zoom].x+latlng.lng()*this.pixelsPerLonDegree[zoom]);
	var d=Math.round(this.pixelOrigin[zoom].y+(-2*latlng.lat())*this.pixelsPerLonDegree[zoom]);
	return new GPoint(c,d)
};

CustomProjection.prototype.fromPixelToLatLng=function(pixel,zoom,unbounded){
	var d=(pixel.x-this.pixelOrigin[zoom].x)/this.pixelsPerLonDegree[zoom];
	var e=-0.5*(pixel.y-this.pixelOrigin[zoom].y)/this.pixelsPerLonDegree[zoom];
	return new GLatLng(e,d,unbounded)
};

CustomProjection.prototype.tileCheckRange=function(tile,zoom,tilesize){
	var tileBounds=this.tileBounds[zoom];
if (tile.y<0 || tile.y >= tileBounds) {return false;}
	if (this.isWrapped) {
	if (tile.x<0 || tile.x>=tileBounds) { 
		tile.x = tile.x%tileBounds; 
		if (tile.x < 0) {tile.x+=tileBounds} 
	}
}
else { 
		if (tile.x<0 || tile.x>=tileBounds) {return false;}
}  
return true;
}
  
CustomProjection.prototype.getWrapWidth=function(zoom) {
	return 999999; /* IMPORTANT keeps markers from wrapping */ //this.tileBounds[zoom]*this.tileSize;
}
	
	
////////////////////////////////////////////////////////////////////////////


function customGetTileURL(a,b) {
  //converts tile x,y into keyhole string

  var c=Math.pow(2,b);

	var d=a.x;
	var e=a.y;
	var f="t";
	for(var g=0;g<b;g++){
		c=c/2;
		if(e<c){
			if(d<c){f+="q"}
			else{f+="r";d-=c}
		}
		else{
			if(d<c){f+="t";e-=c}
			else{f+="s";d-=c;e-=c}
		}
	}
	return "http://web.pacific.edu/documents/marketing/campus-map/Images/MapUpdate082708/"+f+".jpg"
}


function getWindowHeight() {
	if (window.self&&self.innerHeight) {
		return self.innerHeight;
	}
	if (document.documentElement&&document.documentElement.clientHeight) {
		return document.documentElement.clientHeight;
	}
	return 0;
}

function resizeMapDiv() {
	//Resize the height of the div containing the map.
	//Do not call any map methods here as the resize is called before the map is created.
	var d=document.getElementById("map");
	var offsetTop=0;
	for (var elem=d; elem!=null; elem=elem.offsetParent) {
		offsetTop+=elem.offsetTop;
	}
	var height=getWindowHeight()-offsetTop-16;
	if (height>=0) {
		d.style.height=height+"px";
	}
}

function makeMap() 
{
	//resizeMapDiv();
	var copyright = new GCopyright(1,
						  new GLatLngBounds(new GLatLng(-90, -180),
											new GLatLng(90, 180)),
						  0,
						  " ");
	var copyrightCollection = new GCopyrightCollection("University of the Pacific");
	copyrightCollection.addCopyright(copyright);

	//create a custom picture layer
	var pic_tileLayers = [ new GTileLayer(copyrightCollection , 0, 17)];
	pic_tileLayers[0].getTileUrl = customGetTileURL;
	pic_tileLayers[0].isPng = function() { return false; };
	pic_tileLayers[0].getOpacity = function() { return 1.0; };
	var proj=new CustomProjection(5,imageWraps);
	var pic_customMap = new GMapType(pic_tileLayers, proj, "Pic",
		{maxResolution:4, minResolution:0, errorMessage:"Data not available"});


	//Now create the custom map. Would normally be G_NORMAL_MAP,G_SATELLITE_MAP,G_HYBRID_MAP
	map = new GMap2(document.getElementById("map"),{mapTypes:[pic_customMap]});
	map.addControl(new GLargeMapControl());
	map.addControl(new GMapTypeControl());
	//map.addControl(new GOverviewMapControl());
	map.enableDoubleClickZoom();
	map.enableContinuousZoom();
	map.enableScrollWheelZoom();
	mapcenter[0] = new GLatLng(centreLat, centreLon);
	mapcenter[1] = initialZoom;
	mapcenter[2] = pic_customMap;
	map.setCenter(mapcenter[0], mapcenter[1], mapcenter[2]);
}