VC画线几个常见方法

转自http://www.cnblogs.com/tuncaysanli/archive/2009/11/14/1603093.html

首先，在VIEW类中增加一个私有的成员变量m_ptOrigin，再增加两个windows的消息响应，一个是WM_LBUTTONDOWN,一个是WM_LBUTTONUP.

1:利用HDC去画线;

2:利用CDC画线;

3:利用CClientDC画线;

4:利用CWindowDC画线;

5:利用Cpen画线;

代码如下(仅包含了WM_LBUTTONDOWN和WM_LBUTTONUP中的代码):

 1:  void CBlogView::OnLButtonDown(UINT nFlags, CPoint point) 

 2:  {

 3:  // TODO: Add your message handler code here and/or call default

 4:  m_ptOrigin=point;

 5:  CView::OnLButtonDown(nFlags, point);

 6:  }

 7:   

 8:  void CBlogView::OnLButtonUp(UINT nFlags, CPoint point) 

 9:  {

10:  // TODO: Add your message handler code here and/or call default

11:  /* HDC hdc;

12:  hdc=::GetDC(m_hWnd);

13:  MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);

14:  LineTo(hdc,point.x,point.y);

15:  ::ReleaseDC(m_hWnd,hdc);//利?用?SDK的?HDC画?线?

16:  */

17:  /* CDC *pDC=GetDC();

18:  pDC->MoveTo(m_ptOrigin);

19:  pDC->LineTo(point);

20:  ReleaseDC(pDC);//利?用?CDC画?线?

21:  */

22:  /* CClientDC dc(this);

23:  dc.MoveTo(m_ptOrigin);

24:  dc.LineTo(point);//利?用?CClientDC画?线?

25:  */

26:  /* CWindowDC dc(GetDesktopWindow());

27:  dc.MoveTo(m_ptOrigin);

28:  dc.LineTo(point);//利?用?CWindowDC画?线?。?

29:  */

30:  /* CPen pen(PS_SOLID,1,RGB(123,123,123));

31:  CClientDC dc(this);

32:  CPen *pOldPen=dc.SelectObject(&pen);

33:  dc.MoveTo(m_ptOrigin);

34:  dc.LineTo(point);

35:  dc.SelectObject(pOldPen);//用?Cpen去?画?线?

36:  */

37:  CView::OnLButtonUp(nFlags, point);

38:  }