С помощью GetClientRect вывести текст в центре окна (MFC)

#include "stdafx.h"
#include "Lab1.h"
 
#include "Lab1Doc.h"
#include "Lab1View.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
 
 
// CLab1View
 
IMPLEMENT_DYNCREATE(CLab1View, CView)
 
BEGIN_MESSAGE_MAP(CLab1View, CView)
    // Standard printing commands
    ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CView::OnFilePrintPreview)
END_MESSAGE_MAP()
 
// CLab1View construction/destruction
 
CLab1View::CLab1View()
{
    // TODO: add construction code here
 
}
 
CLab1View::~CLab1View()
{
}
 
BOOL CLab1View::PreCreateWindow(CREATESTRUCT& cs)
{
    // TODO: Modify the Window class or styles here by modifying
    //  the CREATESTRUCT cs
 
    return CView::PreCreateWindow(cs);
}
 
// CLab1View drawing
 
void CLab1View::OnDraw(CDC* pDC)
{
double x,y,a;
double G;
x=1;
y=2;
a=3;
CString chisl=_T("Значение выражения G=((x+3a+y)/2x)4-x/(x+3a-y) ");
CString chisl2;
chisl2.Format(_T("при x=%.2f, y=%.2f, a=%.2f "),x,y,a);
CLab1Doc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
 
G=((x+3*a+y)/2*x)*4-x/(x+3*a-y);
 
pDC->TextOut(0,0, chisl);
CString G_str;
G_str.Format(_T("G =%.3f"),G);
pDC->TextOut(0, 0, chisl);
pDC->TextOut(0, 20, chisl2);
pDC->TextOut(0, 40, G_str);
if (!pDC)
return;
}
// CLab1View printing
 
BOOL CLab1View::OnPreparePrinting(CPrintInfo* pInfo)
{
    // default preparation
    return DoPreparePrinting(pInfo);
}
 
void CLab1View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
    // TODO: add extra initialization before printing
}
 
void CLab1View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
    // TODO: add cleanup after printing
}
 
 
// CLab1View diagnostics
 
#ifdef _DEBUG
void CLab1View::AssertValid() const
{
    CView::AssertValid();
}
 
void CLab1View::Dump(CDumpContext& dc) const
{
    CView::Dump(dc);
}
 
CLab1Doc* CLab1View::GetDocument() const // non-debug version is inline
{
    ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CLab1Doc)));
    return (CLab1Doc*)m_pDocument;
}
#endif //_DEBUG