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作者：刘涛 来源：天极开发 2007年10月16日
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| /////////////////// Picture object--encapsulates IPicture #pragma once #include <atlbase.h> class CPicture { public: CPicture(); ~CPicture(); // Load frm various sosurces BOOL Load(UINT nIDRes); BOOL Load(LPCTSTR pszPathName); BOOL Load(CFile& file); BOOL Load(CArchive& ar); BOOL Load(IStream* pstm); // render to device context BOOL Render(CDC* pDC, CRect rc=CRect(0,0,0,0), LPCRECT prcMFBounds=NULL) const; CSize GetImageSize(CDC* pDC=NULL) const; operator IPicture*() { return m_spIPicture; } void GetHIMETRICSize(OLE_XSIZE_HIMETRIC& cx, OLE_YSIZE_HIMETRIC& cy) const { cx = cy = 0; const_cast<CPicture*>(this)->m_hr = m_spIPicture->get_Width(&cx); ASSERT(SUCCEEDED(m_hr)); const_cast<CPicture*>(this)->m_hr = m_spIPicture->get_Height(&cy); ASSERT(SUCCEEDED(m_hr)); } void Free() { if (m_spIPicture) { m_spIPicture.Release(); } } protected: CComQIPtr<IPicture>m_spIPicture; // ATL smart pointer to IPicture HRESULT m_hr; // last error code }; /////////////////////////////////////////////////////////////// CPicture implementation #include "StdAfx.h" #include "Picture.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif CPicture::CPicture() {} CPicture::~CPicture() {} BOOL CPicture::Load(UINT nIDRes) // Load from resource. Looks for "IMAGE" type. { // find resource in resource file HINSTANCE hInst = AfxGetResourceHandle(); HRSRC hRsrc = ::FindResource(hInst,MAKEINTRESOURCE(nIDRes),"IMAGE"); // type if (!hRsrc) return FALSE; // load resource into memory DWORD len = SizeofResource(hInst, hRsrc); BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc); if (!lpRsrc) return FALSE; // create memory file and load it CMemFile file(lpRsrc, len); BOOL bRet = Load(file); FreeResource(hRsrc); GlobalFree(lpRsrc); return bRet; } BOOL CPicture::Load(LPCTSTR pszPathName) // Load from path name. { CFile file; if (!file.Open(pszPathName, CFile::modeRead|CFile::shareDenyWrite)) return FALSE; BOOL bRet = Load(file); file.Close(); return bRet; } BOOL CPicture::Load(CFile& file) // Load from CFile { CArchive ar(&file, CArchive::load | CArchive::bNoFlushOnDelete); return Load(ar); } ////// Load from archive--create stream and load from stream. BOOL CPicture::Load(CArchive& ar) { CArchiveStream arcstream(&ar); return Load((IStream*)&arcstream); } ////////////////// // Load from stream (IStream). This is the one that really does it: call // OleLoadPicture to do the work. BOOL CPicture::Load(IStream* pstm) { Free(); HRESULT hr = OleLoadPicture(pstm, 0, FALSE,IID_IPicture, (void**)&m_spIPicture); ASSERT(SUCCEEDED(hr) && m_spIPicture); return TRUE; } ////////////////// // Render to device context. Covert to HIMETRIC for IPicture. BOOL CPicture::Render(CDC* pDC, CRect rc, LPCRECT prcMFBounds) const { ASSERT(pDC); if (rc.IsRectNull()) { CSize sz = GetImageSize(pDC); rc.right = sz.cx; rc.bottom = sz.cy; } long hmWidth,hmHeight; // HIMETRIC units GetHIMETRICSize(hmWidth, hmHeight); m_spIPicture->Render(*pDC, rc.left, rc.top, rc.Width(), rc.Height(),0, hmHeight, hmWidth, -hmHeight, prcMFBounds); return TRUE; } ////////////////// // Get image size in pixels. Converts from HIMETRIC to device coords. CSize CPicture::GetImageSize(CDC* pDC) const { if (!m_spIPicture) return CSize(0,0); LONG hmWidth, hmHeight; // HIMETRIC units m_spIPicture->get_Width(&hmWidth); m_spIPicture->get_Height(&hmHeight); CSize sz(hmWidth,hmHeight); if (pDC==NULL) { CWindowDC dc(NULL); dc.HIMETRICtoDP(&sz); // convert to pixels } else { pDC->HIMETRICtoDP(&sz); } return sz; } ///////////////////////////////////// Picture view is a typical scroll view. #include "Doc.h" class CPictureView : public CScrollView { public: virtual ~CPictureView(); CPictureDoc* GetDocument() { return (CPictureDoc*)m_pDocument; } protected: BOOL m_rcImage; // rect to display image in UINT m_iHowScale; // how to scale image CPictureView(); void GetImageRect(CRect& rc); void SetScrollSizes(); virtual void OnDraw(CDC* pDC); // overridden to draw this view virtual void OnInitialUpdate(); // called first time after construct // command/message handlers afx_msg void OnViewScale(UINT nID); afx_msg void OnUpdateViewScale(CCmdUI* pCmdUI); afx_msg BOOL OnEraseBkgnd(CDC* pDC); afx_msg void OnSize(UINT nType, int cx, int cy); DECLARE_DYNCREATE(CPictureView) DECLARE_MESSAGE_MAP() }; ////////////////////////////////////////////////////////////// CPictureView #include "StdAfx.h" #include "View.h" #include "resource.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif IMPLEMENT_DYNCREATE(CPictureView, CScrollView) BEGIN_MESSAGE_MAP(CPictureView, CScrollView) ON_WM_ERASEBKGND() ON_WM_SIZE() ON_COMMAND_RANGE(ID_VIEW_TOFIT, ID_VIEW100, OnViewScale) ON_UPDATE_COMMAND_UI_RANGE(ID_VIEW_TOFIT, ID_VIEW100, OnUpdateViewScale) END_MESSAGE_MAP() CPictureView::CPictureView() { m_iHowScale = ID_VIEW_TOFIT; } CPictureView::~CPictureView() {} void CPictureView::OnInitialUpdate() { SetScrollSizes(); } //////////////////// Set scroll sizes based on picture. Page size = client hieight/width; // line size = 1/10 of this. void CPictureView::SetScrollSizes() { CRect rcClient; GetClientRect(&rcClient); CRect rcImage; GetImageRect(rcImage); CSize szTotal = rcImage.Size(); CSize szPage = rcClient.Size(); CSize szLine = szPage; szLine.cx /= 10; szLine.cy /= 10; CScrollView::SetScrollSizes(MM_TEXT, szTotal, szPage, szLine); Invalidate(); } //////////////////// View was sized: readjust scroll sizes if I'm in "zoom to fit" mode void CPictureView::OnSize(UINT nType, int cx, int cy) { CScrollView::OnSize(nType, cx, cy); if (m_iHowScale==ID_VIEW_TOFIT) { SetScrollSizes(); } } ////////////////// // Erase the background. This is required in case the image is smaller than // the client area, to paint the extra background. Use clipping to avoid flicker. BOOL CPictureView::OnEraseBkgnd(CDC* pDC) { CPictureDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); // get client rectangle CRect rcClient; GetClientRect(&rcClient); CRect rc = rcClient; // get image rectangle CRect rcImage; GetImageRect(rcImage); rc = rcImage; CPoint pt = pDC->GetViewportOrg(); CSize sz = GetTotalSize(); // create clipping region CRgn clipRgn; clipRgn.CreateRectRgnIndirect(&rcClient); pDC->SelectClipRgn(&clipRgn); pDC->ExcludeClipRect(&rcImage); CBrush brush(RGB(0,0,0)); // black pDC->FillRect(&rcClient, &brush); pDC->SelectClipRgn(NULL); return TRUE; } ////////////////// // Draw the picture -- call CPicture to do it. void CPictureView::OnDraw(CDC* pDC) { CPictureDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); CPicture* ppic = pDoc->GetPicture(); ASSERT(ppic); if (*ppic) { CRect rc; GetImageRect(rc); ppic->Render(pDC,rc); } } ////////////////// // Get image rectangle, scaled for current zoom factor. void CPictureView::GetImageRect(CRect& rc) { CPictureDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); CPicture* ppic = pDoc->GetPicture(); ASSERT(ppic); if (!ppic || !*ppic) { rc.SetRect(0,0,0,0); } else if (m_iHowScale==ID_VIEW_TOFIT) { GetClientRect(&rc); } else { CSize sz = ppic->GetImageSize(); switch (m_iHowScale) { case ID_VIEW25: sz.cx >>= 2; sz.cy >>= 2; break; case ID_VIEW33: sz.cx /= 3; sz.cy /= 3; break; case ID_VIEW50: sz.cx >>= 1; sz.cy >>= 1; break; case ID_VIEW75: sz.cx = (sz.cx * 3)/4; sz.cy = (sz.cy * 3)/4; break; } rc.SetRect(0,0,sz.cx,sz.cy); } } ////////////////// // Handle zoom command. void CPictureView::OnViewScale(UINT nID) { if (m_iHowScale != nID) { m_iHowScale = nID; ScrollToPosition(CPoint(0,0)); OnInitialUpdate(); } } //////////// Update zoom menu -- check the whichever zoom factor I'm at now. void CPictureView::OnUpdateViewScale(CCmdUI* pCmdUI) { pCmdUI->SetCheck(pCmdUI->m_nID == m_iHowScale); } |
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