Graph Drawing

Development Platform:
Visual C++

MyDrawView.cpp：Code Content
							// MyDrawView.cpp : implementation of the CMyDrawView class
//
#include "stdafx.h"
#include "MyDraw.h"
#include "MyDrawDoc.h"
#include "MyDrawView.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CMyDrawView
IMPLEMENT_DYNCREATE(CMyDrawView, CView)
BEGIN_MESSAGE_MAP(CMyDrawView, CView)
	//{{AFX_MSG_MAP(CMyDrawView)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	//}}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()
/////////////////////////////////////////////////////////////////////////////
// CMyDrawView construction/destruction
CMyDrawView::CMyDrawView()
{
	// TODO: add construction code here
	m_bDragging=false;
	m_hCross=AfxGetApp()->LoadStandardCursor(IDC_CROSS);
}
CMyDrawView::~CMyDrawView()
{
}
BOOL CMyDrawView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs
	return CView::PreCreateWindow(cs);
}
/////////////////////////////////////////////////////////////////////////////
// CMyDrawView drawing
void CMyDrawView::OnDraw(CDC* pDC)
{
	CMyDrawDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}
/////////////////////////////////////////////////////////////////////////////
// CMyDrawView printing
BOOL CMyDrawView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}
void CMyDrawView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}
void CMyDrawView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}
/////////////////////////////////////////////////////////////////////////////
// CMyDrawView diagnostics
#ifdef _DEBUG
void CMyDrawView::AssertValid() const
{
	CView::AssertValid();
}
void CMyDrawView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}
CMyDrawDoc* CMyDrawView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMyDrawDoc)));
	return (CMyDrawDoc*)m_pDocument;
}
#endif //_DEBUG
/////////////////////////////////////////////////////////////////////////////
// CMyDrawView message handlers
void CMyDrawView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	SetCapture();
	::SetCursor(m_hCross);
	m_ptOrigin=point;
	m_bDragging=TRUE;
	
	CView::OnLButtonDown(nFlags, point);
}
void CMyDrawView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_bDragging)
	{
		CClientDC dc(this);
		dc.MoveTo(m_ptOrigin);
		dc.LineTo(point);
		m_ptOrigin=point;
	}
	
	CView::OnMouseMove(nFlags, point);
}
void CMyDrawView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_bDragging)
	{
		m_bDragging=false;
		ReleaseCapture();
	}
	CView::OnLButtonUp(nFlags, point);
}

						