Zoom(pt.x, pt.y, fZoomScale);
if(fZoomScale <= 0) return;  fZoomScale = max(fZoomScale, m_fZoomScaleMin);   POINT pt = { 0 }; if(bCenter) { T* pT = static_cast<T*>(this); RECT rc; ::GetClientRect(pT->m_hWnd, &rc); pt.x = rc.right / 2; pt.y = rc.bottom / 2; ViewDPtoLP(&pt); }   m_fZoomScale = fZoomScale; SIZE sizeAll = { 0 }; sizeAll.cx = (int)((float)m_sizeLogAll.cx * fZoomScale); sizeAll.cy = (int)((float)m_sizeLogAll.cy * fZoomScale);   CScrollImpl< T >::SetScrollSize(sizeAll);  if(bCenter) CenterOnLogicalPoint(pt);
	void Zoom(POINT pt, float fZoomScale)	{		Zoom(pt.x, pt.y, fZoomScale);	}