MFC消息映射机制的剖析 讲述如何运用ClassWizard

void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
 // TODO: Add your message handler code here and/or call default
 //MessageBox("clicked");
 m_bDraw=TRUE;
 m_ptOrigin=m_ptOld=point;
 CView::OnLButtonDown(nFlags, point);
}

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
 m_bDraw=FALSE;

    /*HDC hdc;
 hdc=::GetDC(m_hWnd);
 MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);
 LineTo(hdc,point.x,point.y);
 ::ReleaseDC(m_hWnd,hdc);*/

 /*CDC *pDC=GetDC();
 pDC->MoveTo(m_ptOrigin);
 pDC->LineTo(point);
 ReleaseDC(pDC);*/

 /*CClientDC dc(this);   //this改为GetParent()后 可在工具栏上绘画
 dc.MoveTo(m_ptOrigin);
 dc.LineTo(point);*/
 
 /*CWindowDC dc(this);    //this改为GetParent()后 可在工具栏上绘画或改为GetDesktopWindow可在屏幕上绘画
 dc.MoveTo(m_ptOrigin);
 dc.LineTo(point);*/
 
 /*CPen pen(PS_SOLID,5,RGB(120,255,0));    //画笔
 CClientDC dc(this);
 CPen *pOldPen=dc.SelectObject(&pen);
 dc.MoveTo(m_ptOrigin);
 dc.LineTo(point);
 dc.SelectObject(pOldPen);*/

 /*CBrush brush(RGB(100,100,100));     //画刷
 CClientDC dc(this);
 dc.FillRect(CRect(m_ptOrigin,point),&brush);*/

 /*CBitmap bitmap;
 bitmap.LoadBitmap(IDB_BITMAP1);      //位图
 CBrush brush(&bitmap);
 CClientDC dc(this);
 dc.FillRect(CRect(m_ptOrigin,point),&brush);*/

 /*CClientDC dc(this);        //透明画刷矩形
 CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
 CBrush *pOldBrush=dc.SelectObject(pBrush);
 dc.Rectangle(CRect(m_ptOrigin,point));
 dc.SelectObject(pOldBrush);*/

 CView::OnLButtonUp(nFlags, point);
}

void CDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
 // TODO: Add your message handler code here and/or call default
 CClientDC dc(this);
 CPen pen(PS_SOLID,1,RGB(255,0,0));
 CPen *pOldPen=dc.SelectObject(&pen);
 if(m_bDraw==TRUE)       
 {  
  /*dc.MoveTo(m_ptOrigin);     //画连续的线段
  dc.LineTo(point);
  m_ptOrigin=point;*/

  /*dc.MoveTo(m_ptOrigin);     //扇形
  dc.LineTo(m_ptOld);
  dc.MoveTo(m_ptOrigin);
  dc.MoveTo(point);
  m_ptOld=point;*/

  dc.MoveTo(m_ptOrigin);
  dc.LineTo(m_ptOld);
  dc.MoveTo(m_ptOld);       // 带边线的扇形
  dc.LineTo(point);
  m_ptOld=point;
  
 }
 dc.SelectObject(pOldPen);
 CView::OnMouseMove(nFlags, point);
}