画笔

void CGdi1View::OnDraw(CDC* pDC)
{
 CGdi1Doc* pDoc = GetDocument();
 ASSERT_VALID(pDoc);
 //graphics graphics(pDC->m_hDC);//注意不要写错。我查了半天 汗
 Graphics graphics(pDC->m_hDC);
    Pen newpen(Color(255,0,0),3);
 newpen.SetWidth(10);//设置画笔宽度
 graphics.DrawLine(&newpen,20,10,200,100);
 // TODO: add draw code for native data here
}