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int cxPage = pDC->GetDeviceCaps (HORZRES);
int cyPage = pDC->GetDeviceCaps (VERTRES);
pDC->SetMapMode (MM_ISOTROPIC) ;
pDC->SetWindowExt ( 1000, 1000) ;
pDC->SetViewportExt (cxPage / 2, -cyPage / 2) ;
pDC->SetViewportOrg (cxPage / 2, cyPage / 2) ;
……
CWnd *qWnd = GetDlgItem(Pic2);
qWnd->Invalidate();
qWnd->UpdateWindow();
CDC* pDC2 = qWnd->GetDC();
//pDC2->SetBkMode(TRANSPARENT);
//pDC2->SelectObject(&font);
CPen *pPenBlue = new CPen(); //创建画笔对象
pPenBlue ->CreatePen(PS_SOLID, 1, RGB(0, 0, 255)); //red
CGdiObject *pOldPen = pDC2 ->SelectObject(pPenBlue);
pDC2->SelectObject(pPenBlue);
pDC2->MoveTo(-700,-500);
pDC2->LineTo(400,400);
pDC2 ->SelectObject(pOldPen);
delete pPenBlue;
ReleaseDC(pDC2);