How to achieve this?? About zoomin/zoomout in CEditView or CEdit...
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I want to add ZoomIn/ZoomOut in my MFC Application, works on text and image, just like MSWORD, how can I get this??:confused::confused: thanks for your response:) -- modified at 22:50 Monday 17th April, 2006
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I want to add ZoomIn/ZoomOut in my MFC Application, works on text and image, just like MSWORD, how can I get this??:confused::confused: thanks for your response:) -- modified at 22:50 Monday 17th April, 2006
Here's a little to get you started. Start a new MFC/SDI app and plop this stuff in the appropriate locations. Set up menu/toolbar buttons for the zoomin/zoomout. Add some drawing code to your OnDraw and you should find that the drawing is fit_to_width in the view and it should be fit to width when printing. The rest is up to you. have fun... (Let me know if I missed something) /////////////////////////////////////////////// //Constants const int MAX_SCALE = 20; // The maximum scale factor //CDocument members... protected: CSize m_DocSize; CSize CYourDoc::GetDocSize() const { return m_DocSize; } CYourDoc::CYourDoc() { // TODO: add one-time construction code here m_DocSize=CSize(2000,2800); } //CScrollView members... protected: int m_Scale; CYourView::CYourView() { // TODO: add construction code here m_Scale=1; // Set scale factor 1:1 SetScrollSizes(MM_TEXT,CSize(0,0)); // Set arbitrary values } void CYourView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) { CScrollView::OnPrepareDC(pDC); // TODO: Add your specialized code here and/or call the base class // Set up the DC for the current scale factor int nExtentX; int nExtentY; CSize sizeDoc; CRect rectClient; // Allows the rectangle to include the bottom and rightmost logical unit // SetGraphicsMode(pDC->m_hDC,GM_ADVANCED); pDC->SetMapMode(MM_ISOTROPIC); // Allow scaling with aspect ratio preserved // Get pertinent rectangle data GetClientRect(&rectClient); sizeDoc=GetDocument()->GetDocSize(); sizeDoc.cy=(-sizeDoc.cy); // Y goes down as it increments pDC->SetWindowExt(sizeDoc); // Window extent is size of document // Calculate viewport extent nExtentX=(int)(GetScale()*rectClient.Width()); nExtentY=(int)((GetScale()*((nExtentX*sizeDoc.cy)/(sizeDoc.cx)))); // What kind of device context do we have? if (pDC->IsPrinting()==TRUE) { // Printer Context. Allow printing to edge of context. No scaling. Margins? pDC->SetViewportExt(pDC->GetDeviceCaps(HORZRES),-pDC->GetDeviceCaps(VERTRES)); } else { // Context is for screen pDC->SetViewportExt(nExtentX,nExtentY); } } int CYourView::GetScale() { return m_Scale; } void CYourView::SetScale(int nScaleFactor) { m_Scale=nScaleFactor; ResetScrollBars(); // Adjust scrollbars to new scale } void CYourView::OnUpdateViewZoomout(CCmdUI* pCmdUI) { // TODO: Add your command update UI handler code here if (GetScale()>=2) pCmdUI->Enable(TRUE); else pCmdUI->Enable(FALSE); } void CYourVie
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Here's a little to get you started. Start a new MFC/SDI app and plop this stuff in the appropriate locations. Set up menu/toolbar buttons for the zoomin/zoomout. Add some drawing code to your OnDraw and you should find that the drawing is fit_to_width in the view and it should be fit to width when printing. The rest is up to you. have fun... (Let me know if I missed something) /////////////////////////////////////////////// //Constants const int MAX_SCALE = 20; // The maximum scale factor //CDocument members... protected: CSize m_DocSize; CSize CYourDoc::GetDocSize() const { return m_DocSize; } CYourDoc::CYourDoc() { // TODO: add one-time construction code here m_DocSize=CSize(2000,2800); } //CScrollView members... protected: int m_Scale; CYourView::CYourView() { // TODO: add construction code here m_Scale=1; // Set scale factor 1:1 SetScrollSizes(MM_TEXT,CSize(0,0)); // Set arbitrary values } void CYourView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) { CScrollView::OnPrepareDC(pDC); // TODO: Add your specialized code here and/or call the base class // Set up the DC for the current scale factor int nExtentX; int nExtentY; CSize sizeDoc; CRect rectClient; // Allows the rectangle to include the bottom and rightmost logical unit // SetGraphicsMode(pDC->m_hDC,GM_ADVANCED); pDC->SetMapMode(MM_ISOTROPIC); // Allow scaling with aspect ratio preserved // Get pertinent rectangle data GetClientRect(&rectClient); sizeDoc=GetDocument()->GetDocSize(); sizeDoc.cy=(-sizeDoc.cy); // Y goes down as it increments pDC->SetWindowExt(sizeDoc); // Window extent is size of document // Calculate viewport extent nExtentX=(int)(GetScale()*rectClient.Width()); nExtentY=(int)((GetScale()*((nExtentX*sizeDoc.cy)/(sizeDoc.cx)))); // What kind of device context do we have? if (pDC->IsPrinting()==TRUE) { // Printer Context. Allow printing to edge of context. No scaling. Margins? pDC->SetViewportExt(pDC->GetDeviceCaps(HORZRES),-pDC->GetDeviceCaps(VERTRES)); } else { // Context is for screen pDC->SetViewportExt(nExtentX,nExtentY); } } int CYourView::GetScale() { return m_Scale; } void CYourView::SetScale(int nScaleFactor) { m_Scale=nScaleFactor; ResetScrollBars(); // Adjust scrollbars to new scale } void CYourView::OnUpdateViewZoomout(CCmdUI* pCmdUI) { // TODO: Add your command update UI handler code here if (GetScale()>=2) pCmdUI->Enable(TRUE); else pCmdUI->Enable(FALSE); } void CYourVie
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Here's a little to get you started. Start a new MFC/SDI app and plop this stuff in the appropriate locations. Set up menu/toolbar buttons for the zoomin/zoomout. Add some drawing code to your OnDraw and you should find that the drawing is fit_to_width in the view and it should be fit to width when printing. The rest is up to you. have fun... (Let me know if I missed something) /////////////////////////////////////////////// //Constants const int MAX_SCALE = 20; // The maximum scale factor //CDocument members... protected: CSize m_DocSize; CSize CYourDoc::GetDocSize() const { return m_DocSize; } CYourDoc::CYourDoc() { // TODO: add one-time construction code here m_DocSize=CSize(2000,2800); } //CScrollView members... protected: int m_Scale; CYourView::CYourView() { // TODO: add construction code here m_Scale=1; // Set scale factor 1:1 SetScrollSizes(MM_TEXT,CSize(0,0)); // Set arbitrary values } void CYourView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) { CScrollView::OnPrepareDC(pDC); // TODO: Add your specialized code here and/or call the base class // Set up the DC for the current scale factor int nExtentX; int nExtentY; CSize sizeDoc; CRect rectClient; // Allows the rectangle to include the bottom and rightmost logical unit // SetGraphicsMode(pDC->m_hDC,GM_ADVANCED); pDC->SetMapMode(MM_ISOTROPIC); // Allow scaling with aspect ratio preserved // Get pertinent rectangle data GetClientRect(&rectClient); sizeDoc=GetDocument()->GetDocSize(); sizeDoc.cy=(-sizeDoc.cy); // Y goes down as it increments pDC->SetWindowExt(sizeDoc); // Window extent is size of document // Calculate viewport extent nExtentX=(int)(GetScale()*rectClient.Width()); nExtentY=(int)((GetScale()*((nExtentX*sizeDoc.cy)/(sizeDoc.cx)))); // What kind of device context do we have? if (pDC->IsPrinting()==TRUE) { // Printer Context. Allow printing to edge of context. No scaling. Margins? pDC->SetViewportExt(pDC->GetDeviceCaps(HORZRES),-pDC->GetDeviceCaps(VERTRES)); } else { // Context is for screen pDC->SetViewportExt(nExtentX,nExtentY); } } int CYourView::GetScale() { return m_Scale; } void CYourView::SetScale(int nScaleFactor) { m_Scale=nScaleFactor; ResetScrollBars(); // Adjust scrollbars to new scale } void CYourView::OnUpdateViewZoomout(CCmdUI* pCmdUI) { // TODO: Add your command update UI handler code here if (GetScale()>=2) pCmdUI->Enable(TRUE); else pCmdUI->Enable(FALSE); } void CYourVie
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I get it! firt time I failed because I used Textout function without creating a CFont. bob16972,thank you very much!!