exam6_6view.cpp

for study. very simple example.

// Exam6_6View.cpp : implementation of the CExam6_6View class
//

#include "stdafx.h"
#include "Exam6_6.h"

#include "Exam6_6Doc.h"
#include "Exam6_6View.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CExam6_6View

IMPLEMENT_DYNCREATE(CExam6_6View, CView)

BEGIN_MESSAGE_MAP(CExam6_6View, CView)
	//{{AFX_MSG_MAP(CExam6_6View)
	ON_WM_LBUTTONUP()
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CExam6_6View construction/destruction

CExam6_6View::CExam6_6View()
{
	// TODO: add construction code here

m_Drag=0;














}

CExam6_6View::~CExam6_6View()
{
}

BOOL CExam6_6View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CExam6_6View drawing

void CExam6_6View::OnDraw(CDC* pDC)
{
	CExam6_6Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CExam6_6View printing

BOOL CExam6_6View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CExam6_6View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CExam6_6View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CExam6_6View diagnostics

#ifdef _DEBUG
void CExam6_6View::AssertValid() const
{
	CView::AssertValid();
}

void CExam6_6View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CExam6_6Doc* CExam6_6View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CExam6_6Doc)));
	return (CExam6_6Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CExam6_6View message handlers

void CExam6_6View::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
if(m_Drag)
{	 
	 m_Drag=0;
	 ReleaseCapture();
	 ClipCursor(NULL);
}
	 


	CView::OnLButtonUp(nFlags, point);
}

void CExam6_6View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	 m_CurrentPoint=point;
	 m_OriginPoint=Point;
	 SetCapture();
	 m_Drag=1;
	 RECT rect;
	 GetClientRect(&rect);
     ClientToScreen(&rect);
     ClipCursor(&rect);
	CView::OnLButtonDown(nFlags, point);
}

void CExam6_6View::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_Drag)
	{
	
	CClientDC dc(this);
	CPen myPen;
	cPen *pOldPen;
	myPen.CreatePen(PS_SOLID,((CExam6_6App *)AfxGetApp())->m_myPenWidth,((CExam6_6App *)AfxGetApp())->m_myPenColor);
	dc.SetROP2(R2_NOTXORPEN);
	pOldPen=dc.SelectObject(&myPen);
	dc.MoveTo(m_OriginPoint);
	dc.LineTo(m_CurrentPoint);
	dc.MoveTo(m_OriginPoint);
	dc.LineTo(point);
	dc.SelectObject(pOldPen);
	m_CurrentPoint=point;
	
	
	
	
	}
















	CView::OnMouseMove(nFlags, point);
}