imagezoominview.cpp

visual c++数字图像与图形处理中的光盘内容

// ImageZoomInView.cpp : implementation of the CImageZoomInView class
//

#include "stdafx.h"
#include "ImageZoomIn.h"

#include "ImageZoomInDoc.h"
#include "ImageZoomInView.h"

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

#include "BorderRect.h"

/////////////////////////////////////////////////////////////////////////////
// CImageZoomInView

IMPLEMENT_DYNCREATE(CImageZoomInView,  CView)

BEGIN_MESSAGE_MAP(CImageZoomInView,  CView)
	//{{AFX_MSG_MAP(CImageZoomInView)
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CImageZoomInView construction/destruction

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

}

CImageZoomInView::~CImageZoomInView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CImageZoomInView drawing

void CImageZoomInView::OnDraw(CDC* pDC)
{

	BeginWaitCursor();
	CDC memDC;
	memDC.CreateCompatibleDC(pDC);
	CBitmap* pOldBitmap = memDC.SelectObject(&m_bitmap);
	
	CRect clientRect;
	GetClientRect(&clientRect);

	int cx = clientRect.Width();
	int cy = clientRect.Height();

	pDC->BitBlt(0, 0, cx, cy, &memDC, 0, 0, SRCCOPY);	
	memDC.SelectObject(pOldBitmap);
	EndWaitCursor();
	
	ZoomInto(pDC);

}

/////////////////////////////////////////////////////////////////////////////
// CImageZoomInView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CImageZoomInView message handlers

int CImageZoomInView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// TODO: Add your specialized creation code here
	//打开文件
	CDib* pBackDib = new CDib("back.bmp");

	if (!pBackDib->IsValid())
		MessageBox("文件打开出错", "文件 \"back.bmp\"", 
			MB_OK | MB_ICONEXCLAMATION);

	//
	CClientDC dc(this);

	m_bitmap.CreateCompatibleBitmap(&dc, 800, 600);

	CDC memDC;
	memDC.CreateCompatibleDC(&dc);

	CBitmap* pOldBitmap = memDC.SelectObject(&m_bitmap);
	CBrush* pBrush = new CBrush(RGB(255, 255, 255));
	CRect rect(0, 0, 800, 600);
	memDC.FillRect(rect, pBrush);

	//绘制背景位图
	if (pBackDib)
	{
		BYTE* pBackDibData = pBackDib->GetDibData();
		LPBITMAPINFO pBackBmpInfo = pBackDib->GetBmpInfo();
		int nWidth = (int)pBackDib->GetWidth();
		int nHeight = (int)pBackDib->GetHeight();
		StretchDIBits(memDC.m_hDC,  0,  0,  nWidth,  nHeight, 
			0,  0,  nWidth,  nHeight,  pBackDibData,  pBackBmpInfo, 
			DIB_RGB_COLORS,  SRCCOPY);
	}
	memDC.SelectObject(pOldBitmap);
	delete pBrush;	
	ReleaseDC(&dc);

	if (pBackDib)
	{
		delete pBackDib;
		pBackDib = NULL;
	}
	
	return 0;
}

void CImageZoomInView::Delay(DWORD ms)
{
	DWORD time = GetTickCount();
	do{;}while((GetTickCount() - time) < ms);
}

void CImageZoomInView::ZoomInto(CDC *pDC)
{
	CImageZoomInDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here

	//第一步, 获取在文档中已经打开的位图

	//获取外部DIB信息
	CDib* pDib = pDoc->m_pDib;
	if(!pDib)return;
	BYTE* pDibData = pDib->GetDibData();
	LPBITMAPINFO pBmpInfo = pDib->GetBmpInfo();

	int nWidth = (int)pDib->GetWidth();
	int nHeight = (int)pDib->GetHeight();

	//第二步, 绘制一个嵌入矩形框
	CRect clientRect;
	GetClientRect(&clientRect);

	//左上角点
	int cx = clientRect.Width();
	int cy = clientRect.Height();

	cx = (cx - nWidth) / 2;
	cy = (cy - nHeight) / 2;

	//绘制一个内嵌框
	CBorderRect br(cx - 2, cy - 2, nWidth + 4, nHeight + 4);
	br.Draw(pDC, FALSE);

	//第三步, 推进图像

	//绘制坐标步长, 
	int nStepX, nStepY;

	//求出宽度和高度的最大者
	if(nWidth >= nHeight)
	{
		nStepX = 10;
		nStepY = (int)(10.0f * ((float)nHeight / (float)nWidth) + 0.5f);
	}
	else
	{
		nStepY = 10;
		nStepX = (int)(10.0f * ((float)nWidth / (float)nHeight) + 0.5f);
	}

	//这里只实现从中央向四周推进的效果

	//图像中心坐标
	int nCenterX = cx + (nWidth / 2);
	int nCenterY = cy + (nHeight / 2);

	//
	
	//如果图像为8, 4, 2位颜色位图
	if(pDib->GetRGBQuad())
	{
		//实现逻辑调色盘
		HPALETTE hPalette = pDib->CreateBitmapPalette();
        HPALETTE hOldPalette = ::SelectPalette(pDC->m_hDC,  hPalette,  FALSE);
        ::RealizePalette(pDC->m_hDC);

		//绘制
		for(int x = nStepX,  y = nStepY; x < nWidth / 2;x += nStepX,  y += nStepY)
		{
			StretchDIBits(pDC->m_hDC, (nCenterX - x), (nCenterY - y), (x + x), (y + y), 
								0, 0, nWidth, nHeight, 
								pDibData, pBmpInfo, DIB_RGB_COLORS,  SRCCOPY);
			Delay(25);
		}

		StretchDIBits(pDC->m_hDC, cx, cy, nWidth, nHeight, 
							0, 0, nWidth, nHeight, 
							pDibData, pBmpInfo, DIB_RGB_COLORS,  SRCCOPY);
		//释放
        ::SelectPalette(pDC->m_hDC,  hOldPalette,  FALSE);
        ::DeleteObject(hPalette);
	}
	else
	{
		for(int x = nStepX,  y = nStepY; x < nWidth / 2;x += nStepX,  y += nStepY)
		{
			StretchDIBits(pDC->m_hDC, (nCenterX - x), (nCenterY - y), (x + x), (y + y), 
								0, 0, nWidth, nHeight, 
								pDibData, pBmpInfo, DIB_RGB_COLORS,  SRCCOPY);
			Delay(25);
		}

		StretchDIBits(pDC->m_hDC, cx, cy, nWidth, nHeight, 
							0, 0, nWidth, nHeight, 
							pDibData, pBmpInfo, DIB_RGB_COLORS,  SRCCOPY);

	}

}