使用CPen类绘制指定直线

// lessonMyLineView.cpp : implementation of the ClessonMyLineView class
//

#include "stdafx.h"
// SHARED_HANDLERS can be defined in an ATL project implementing preview, thumbnail
// and search filter handlers and allows sharing of document code with that project.
#ifndef SHARED_HANDLERS
#include "lessonMyLine.h"
#endif

#include "lessonMyLineDoc.h"
#include "lessonMyLineView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// ClessonMyLineView

IMPLEMENT_DYNCREATE(ClessonMyLineView, CView)

  BEGIN_MESSAGE_MAP(ClessonMyLineView, CView)
    // Standard printing commands
    ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_PREVIEW, &ClessonMyLineView::OnFilePrintPreview)
    ON_WM_CONTEXTMENU()
    ON_WM_RBUTTONUP()
    ON_WM_LBUTTONDOWN()
    ON_WM_LBUTTONUP()
  END_MESSAGE_MAP()

  // ClessonMyLineView construction/destruction

  ClessonMyLineView::ClessonMyLineView()
    : m_point(0)
  {
    // TODO: add construction code here

  }

  ClessonMyLineView::~ClessonMyLineView()
  {
  }

  BOOL ClessonMyLineView::PreCreateWindow(CREATESTRUCT& cs)
  {
    // TODO: Modify the Window class or styles here by modifying
    //  the CREATESTRUCT cs

    return CView::PreCreateWindow(cs);
  }

  // ClessonMyLineView drawing

  void ClessonMyLineView::OnDraw(CDC* /*pDC*/)
  {
    ClessonMyLineDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    if (!pDoc)
      return;

    // TODO: add draw code for native data here
  }


  // ClessonMyLineView printing


  void ClessonMyLineView::OnFilePrintPreview()
  {
#ifndef SHARED_HANDLERS
    AFXPrintPreview(this);
#endif
  }

  BOOL ClessonMyLineView::OnPreparePrinting(CPrintInfo* pInfo)
  {
    // default preparation
    return DoPreparePrinting(pInfo);
  }

  void ClessonMyLineView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
  {
    // TODO: add extra initialization before printing
  }

  void ClessonMyLineView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
  {
    // TODO: add cleanup after printing
  }

  void ClessonMyLineView::OnRButtonUp(UINT /* nFlags */, CPoint point)
  {
    ClientToScreen(&point);
    OnContextMenu(this, point);
  }

  void ClessonMyLineView::OnContextMenu(CWnd* /* pWnd */, CPoint point)
  {
#ifndef SHARED_HANDLERS
    theApp.GetContextMenuManager()->ShowPopupMenu(IDR_POPUP_EDIT, point.x, point.y, this, TRUE);
#endif
  }


  // ClessonMyLineView diagnostics

#ifdef _DEBUG
  void ClessonMyLineView::AssertValid() const
  {
    CView::AssertValid();
  }

  void ClessonMyLineView::Dump(CDumpContext& dc) const
  {
    CView::Dump(dc);
  }

  ClessonMyLineDoc* ClessonMyLineView::GetDocument() const // non-debug version is inline
  {
    ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(ClessonMyLineDoc)));
    return (ClessonMyLineDoc*)m_pDocument;
  }
#endif //_DEBUG


  // ClessonMyLineView message handlers


  void ClessonMyLineView::OnLButtonDown(UINT nFlags, CPoint point)
  {
    // TODO: Add your message handler code here and/or call default
    m_point=point;
    CView::OnLButtonDown(nFlags, point);
  }


  void ClessonMyLineView::OnLButtonUp(UINT nFlags, CPoint point)
  {
    // TODO: Add your message handler code here and/or call default
    /*   //111111111111使用MFC的CDC实现绘画
    CDC *pcdc=GetDC();
    pcdc->MoveTo(m_point);
    pcdc->LineTo(point);
    ReleaseDC(pcdc);
    */
    /*  //22222222222222222222使用MFC的CClentDC实现绘画
    CClientDC ccdc(this);
    ccdc.MoveTo(m_point);
    ccdc.LineTo(point);
    */
    /*   //333333333333333333
    //使用MFC的CWindowDC实现
    //注意此时不区分客户区和功能区
    //CWindowDC cwdc(GetParent()); 
    CWindowDC cwdc(this);
    cwdc.MoveTo(m_point);
    cwdc.LineTo(point);    
    */
    CPen pen(PS_DASH,1,RGB(255,0,0));
    //CPen pen(PS_SOLID,RGB(255,0,0));
    CClientDC ccdc(this);
    CPen *pOpen=ccdc.SelectObject(&pen);

    ccdc.MoveTo(m_point);
    ccdc.LineTo(point);

    ccdc.SelectObject(pOpen);
    CView::OnLButtonUp(nFlags, point);
  }