CPen pen(PS_DOT,5,RGB(0,255,0));
CClientDC dc(this);
CPen *pOldPen=dc.SelectObject(&pen);
dc.MoveTo(PrePoint);
dc.LineTo(CurPoint);
CClientDC dc(this);
CPen *pOldPen=dc.SelectObject(&pen);
dc.MoveTo(PrePoint);
dc.LineTo(CurPoint);
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