/* functions to implement smooth zoom with mouse wheel */
function exO(a){return Math.round(a)+"px"}

GMap.prototype.applyZoom = function(a)
{
	var b = this;
	var c = Math.floor(Math.log(b.viewSize.width) * Math.LOG2E - 2);
	var d = b.zoomLevel - a;
	if (d > c)
	{
		d = c;
	}
	else if (d < -c)
	{
		d = -c;
	}
	
	var e = Math.pow(2, d);
	b.div.style.zoom = e;
	var f = b.viewSize.width * b.centerScreen.x;
	var h = b.viewSize.height * b.centerScreen.y;
	b.div.style.left = exO((this._savedOffset.x - f) * e + f);
	b.div.style.top = exO((this._savedOffset.y - h) * e + h);
}

function clamp(i,a,b){return i<=a?a:i>=b?b:i}

GMap.prototype.smoothZoomTo = function(zoom_in)
{
	var a = this;
	
	if (!a._zoomInterval)
		a._targetZoom = a.getZoomLevel();
	
	a._targetZoom = clamp(a._targetZoom + (zoom_in ? 1 : -1), 0, 17);
	// it's not easy to do the nice zoom on browsers that don't support zoom
	if (a.div.style.zoom == undefined)
	{
		a.zoomTo(a._targetZoom);
		return;
	}
	
	if (a._zoomInterval)
		return;

	a._currentZoom = parseInt(a.getZoomLevel());
	a._savedOffset={"x" : a.div.offsetLeft, "y" : a.div.offsetTop};
	a.hideOverlays();

	this._zoomInterval = setInterval(function() {
		a._currentZoom += 0.3 * (a._targetZoom - a._currentZoom);
		
		if (Math.abs(a._targetZoom - a._currentZoom) < 0.05)
		{
			if (a._savedOffset)
			{
				a.div.style.left=exO(a._savedOffset.x);
				a.div.style.top=exO(a._savedOffset.y);
			}
			a.div.style.zoom = 1;
			a.showOverlays();
			a.zoomTo(a._targetZoom);
			a._savedOffset = null;
			window.clearInterval(a._zoomInterval);
			a._zoomInterval = null;
		}
		else
		{
			a.applyZoom(a._currentZoom);
		}
	}, 50);
}

// Hook the mouse wheel to zoom the map on Mozilla and Internet Explorer 6.0 browsers
function hookMouseWheelHandlers(d)
{
	try
	{
		if (document.body.addEventListener)
			d.addEventListener('DOMMouseScroll', function(oEvent) { zoom(oEvent, oEvent.detail * -40); }, false);
		else
			d.onmousewheel = function() { zoom(event, event.wheelDelta); return false; }
	} catch (ex) {}
}

function zoom(oEvent, scr)
{
	var zoom_in = true;
	
	if (scr >= 120)
		zoom_in = false;
	
	map.smoothZoomTo(zoom_in);
	if (oEvent.preventDefault)
		oEvent.preventDefault();
}
// END WHEEL FUNCTIONALITY //////////////////////////////////////////