www.pudn.com > ZImage.rar > ZoomPartView.cpp

// ZoomPartView.cpp : implementation of the CZoomPartView class 
// 
 
#include "stdafx.h" 
#include "ZoomPart.h" 
 
#include "ZoomPartDoc.h" 
#include "ZoomPartView.h" 
#include "MainFrm.h" 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CZoomPartView 
 
IMPLEMENT_DYNCREATE(CZoomPartView, CView) 
 
BEGIN_MESSAGE_MAP(CZoomPartView, CView) 
	//{{AFX_MSG_MAP(CZoomPartView) 
	ON_WM_MOUSEMOVE() 
	ON_WM_LBUTTONDOWN() 
	ON_WM_RBUTTONDOWN() 
	//}}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() 
 
///////////////////////////////////////////////////////////////////////////// 
// CZoomPartView construction/destruction 
 
CZoomPartView::CZoomPartView() 
{ 
	// TODO: add construction code here 
	m_pdcMem = new CDC; 
	m_pBitmap = new CBitmap; 
	recover = true; 
	s = 30; d = 30; 
	mana = SRCCOPY; 
 
} 
 
CZoomPartView::~CZoomPartView() 
{ 
	delete m_pdcMem; 
	delete m_pBitmap; 
} 
 
BOOL CZoomPartView::PreCreateWindow(CREATESTRUCT& cs) 
{ 
	// TODO: Modify the Window class or styles here by modifying 
	//  the CREATESTRUCT cs 
 
	return CView::PreCreateWindow(cs); 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// CZoomPartView drawing 
 
void CZoomPartView::OnDraw(CDC* pDC) 
{ 
	CZoomPartDoc* pDoc = GetDocument(); 
	ASSERT_VALID(pDoc); 
	// TODO: add draw code for native data here 
 
	//声明判断是否load位图的静态标志 
	static bool load; 
	//按原来大小显示位图 
	if (!load) { 
		BITMAP bm; 
		load = !load; 
		m_pBitmap->LoadBitmap(IDB_BITMAP1); 
		m_pdcMem->CreateCompatibleDC(pDC); 
		m_pdcMem->SelectObject(m_pBitmap); 
		m_pBitmap->GetObject(sizeof(bm),&bm); 
		m_sizeSource.cx = bm.bmWidth; 
		m_sizeSource.cy = bm.bmHeight; 
		m_sizeDest = m_sizeSource; 
		pDC->StretchBlt(0,0,m_sizeSource.cx,m_sizeSource.cy, 
			m_pdcMem,0,0,m_sizeSource.cx,m_sizeSource.cy,mana); 
	} 
	else { 
		pDC->StretchBlt(0,0,m_sizeSource.cx,m_sizeSource.cy, 
			m_pdcMem,0,0,m_sizeSource.cx,m_sizeSource.cy,mana); 
} 
 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// CZoomPartView printing 
 
BOOL CZoomPartView::OnPreparePrinting(CPrintInfo* pInfo) 
{ 
	// default preparation 
	return DoPreparePrinting(pInfo); 
} 
 
void CZoomPartView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) 
{ 
	// TODO: add extra initialization before printing 
} 
 
void CZoomPartView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) 
{ 
	// TODO: add cleanup after printing 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// CZoomPartView diagnostics 
 
#ifdef _DEBUG 
void CZoomPartView::AssertValid() const 
{ 
	CView::AssertValid(); 
} 
 
void CZoomPartView::Dump(CDumpContext& dc) const 
{ 
	CView::Dump(dc); 
} 
 
CZoomPartDoc* CZoomPartView::GetDocument() // non-debug version is inline 
{ 
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CZoomPartDoc))); 
	return (CZoomPartDoc*)m_pDocument; 
} 
#endif //_DEBUG 
 
///////////////////////////////////////////////////////////////////////////// 
// CZoomPartView message handlers 
 
void CZoomPartView::OnMouseMove(UINT nFlags, CPoint point)  
{ 
	//计算要放大的局部矩形的源图像位置和目标位置 
	CString cord; 
	int dd; 
    CRect srect,drect,mrect; 
	srect.left = point.x - s; 
	srect.top = point.y - s; 
	srect.right = point.x + s; 
	srect.bottom = point.y + s; 
	 
	drect.left = point.x - d; 
	drect.top = point.y - d; 
	drect.right = point.x + d; 
	drect.bottom = point.y + d; 
	 
	mrect.left = oldx - d; 
	mrect.top = oldy - d; 
	mrect.right = oldx + d; 
	mrect.bottom = oldy + d; 
	dd = 2*d; 
	CDC * pDC = GetDC(); 
	OnPrepareDC(pDC); 
	//放大图像 
	if (recover) 
	{ 
		//从源位图中截取要放大的部分。 
		pDC->BitBlt(mrect.left,mrect.top,dd,dd, 
			m_pdcMem,mrect.left,mrect.top,mana); 
	} 
	//把从源位图中截取的部分放大、COPY回原图。 
	pDC->StretchBlt(drect.left,drect.top, 
		drect.Width(),drect.Height(),m_pdcMem,srect.left, 
		srect.top,srect.Width(),srect.Height(),mana); 
	oldx = point.x; oldy = point.y; 
	ReleaseDC(pDC); 
	 
	recover = true; 
 
	CView::OnMouseMove(nFlags, point); 
} 
 
void CZoomPartView::OnLButtonDown(UINT nFlags, CPoint point)  
{ 
	//如果鼠标位置不在位图上，则还原位图大小显示 
	CRect rc(0,0,m_sizeSource.cx,m_sizeSource.cy); 
	if(!rc.PtInRect(point)) 
	{ 
		Invalidate(); 
	} 
	else if (d > 10)//如果放大倍数大于5，就继续减小放大倍数，然后进行放大显示 
	{ 
		CDC * pDC = GetDC(); 
		pDC->StretchBlt(oldx - d,oldy - d,2*d, 
			2*d,m_pdcMem,oldx - d,oldy - d,2*d,2*d,mana); 
		d -= 10; 
		ReleaseDC(pDC); 
		CZoomPartView::OnMouseMove(nFlags, point); 
	}  
	CView::OnLButtonDown(nFlags, point); 
} 
 
void CZoomPartView::OnRButtonDown(UINT nFlags, CPoint point)  
{ 
	//如果鼠标位置不在位图上，则还原位图大小显示 
	CRect rc(0,0,m_sizeSource.cx,m_sizeSource.cy); 
	if(!rc.PtInRect(point)) 
	{ 
		Invalidate(); 
	} 
	else if (d <150)//如果放大倍数小于150，就继续增加放大倍数，然后进行放大显示 
	{  
		d += 10; 
		CZoomPartView::OnMouseMove(nFlags, point);  
	}  
	CView::OnRButtonDown(nFlags, point); 
}