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CPen pen(PS_SOLID, 2, RGB(0, 0, 0));
CClientDC dc(this);
CRect rtClient;
GetClientRect(&rtClient);
dc.SelectObject(&pen);
dc.SetMapMode(MM_ANISOTROPIC);
dc.SetViewportExt(rtClient.Width(), rtClient.Height());
dc.SetWindowExt(500, 500);
dc.MoveTo(0, 0);
dc.LineTo(100, 100);