myview.cpp

VC面向对象的学习教程

// MyView.cpp : implementation of the CMyView class
//

#include "stdafx.h"
#include "My.h"

#include "MyDoc.h"
#include "MyView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMyView

IMPLEMENT_DYNCREATE(CMyView, CView)

BEGIN_MESSAGE_MAP(CMyView, CView)
	//{{AFX_MSG_MAP(CMyView)
	ON_COMMAND(ID_BESTFIT, OnBestFit)
	ON_COMMAND(ID_SHRINK, OnShrink)
	ON_COMMAND(ID_ZOOMOUT, OnZoomOut)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyView construction/destruction

CMyView::CMyView()
{
	// TODO: add construction code here
	// 载入位图资源，读位图信息
	BITMAP BM;
	m_Bitmap.LoadBitmap(IDB_BITMAP1);
	m_Bitmap.GetBitmap(&BM);
	m_nWidth	= BM.bmWidth;
	m_nHeight	= BM.bmHeight;
	m_fTimes	= 1.0;
}

CMyView::~CMyView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMyView drawing

// 响应绘制窗口客户区消息
void CMyView::OnDraw(CDC* pDC)
{
	CMyDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	// 显示位图
	CDC MemDC;
	MemDC.CreateCompatibleDC(NULL);
	MemDC.SelectObject(&m_Bitmap);
	pDC->StretchBlt(0, 0, (int)(m_nWidth*m_fTimes),
						(int)(m_nHeight*m_fTimes),
					 &MemDC, 0, 0, m_nWidth, m_nHeight, SRCCOPY);
}

/////////////////////////////////////////////////////////////////////////////
// CMyView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMyView message handlers
	// 原样显示
void CMyView::OnBestFit() 
{
	// TODO: Add your command handler code here
	m_fTimes = 1.0;
	Invalidate();	
}

	// 缩小图像
void CMyView::OnShrink() 
{
	// TODO: Add your command handler code here
	m_fTimes = 0.5;
	Invalidate();
}

	// 放大图像
void CMyView::OnZoomOut() 
{
	// TODO: Add your command handler code here
	m_fTimes = 2.0;
	Invalidate();	
}