void Zoom(int x, int y, float fZoomScale)
void Zoom(float fZoomScale, bool bCenter = true)
	void Zoom(int x, int y, float fZoomScale)	{		if(fZoomScale <= 0)			return;		fZoomScale = max(fZoomScale, m_fZoomScaleMin);		POINT pt = { x, y };		if(!PtInDevRect(pt))			return;		ViewDPtoLP(&pt);		Zoom(fZoomScale, FALSE);		CenterOnLogicalPoint(pt);	}