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);
	}