www.gusucode.com > VC 实现图像局部放大 > VC 实现图像局部放大/gusucode/ZoomPartView.cpp
//Download by http://www.NewXing.com // 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 = 45; 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) { pDC->BitBlt(mrect.left,mrect.top,dd,dd, m_pdcMem,mrect.left,mrect.top,mana); } pDC->StretchBlt(drect.left,drect.top, drect.Width(),drect.Height(),m_pdcMem,srect.left, srect.top,srect.Width(),srect.Height(),SRCCOPY); 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 > 5)//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); }