key_testview.cpp

这是一个VC++演示的小例子,比较简单,但还是很典型的,按S为方框,按C为椭圆,

// Key_testView.cpp : implementation of the CKey_testView class
//

#include "stdafx.h"
#include "Key_test.h"

#include "Key_testDoc.h"
#include "Key_testView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CKey_testView

IMPLEMENT_DYNCREATE(CKey_testView, CView)

BEGIN_MESSAGE_MAP(CKey_testView, CView)
	//{{AFX_MSG_MAP(CKey_testView)
	ON_WM_CHAR()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CKey_testView construction/destruction

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

}

CKey_testView::~CKey_testView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CKey_testView drawing

void CKey_testView::OnDraw(CDC* pDC)
{
	CKey_testDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
    CRect rect;
	GetClientRect(&rect);
	rect.top=rect.top+(rect.bottom-rect.top)*1/3;
	rect.left=rect.left+(rect.right-rect.left)*1/3;
	rect.bottom=rect.bottom*2/3;
	rect.right=rect.right*2/3;
	switch(m_nSharp)
	{
	case 1:
		pDC->Ellipse(rect); break;
	case 2:
		pDC->Rectangle(rect);break;
	}// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CKey_testView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CKey_testView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CKey_testView message handlers

void CKey_testView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{

	int nOldSharp=m_nSharp;
switch(nChar)
{
case 'c':
case'C':
	m_nSharp=1;break;
case's':
case'S':
	m_nSharp=2;break;
}
if(m_nSharp!=nOldSharp)	Invalidate();// TODO: Add your message handler code here and/or call default
	
	CView::OnChar(nChar, nRepCnt, nFlags);
}