Visual C++ 2008入门经典 源代码及习题答案

// SketcherView.cpp : implementation of the CSketcherView class // #include "stdafx.h" #include "Sketcher.h" #include "SketcherDoc.h" #include "Elements.h" #include "SketcherView.h" #include "ChildFrm.h" #include "ScaleDialog.h" #include "TextDialog.h" #include "PrintData.h" #include <cmath> #ifdef _DEBUG #define new DEBUG_NEW #endif // CSketcherView IMPLEMENT_DYNCREATE(CSketcherView, CScrollView) BEGIN_MESSAGE_MAP(CSketcherView, CScrollView) // 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) ON_WM_LBUTTONUP() ON_WM_LBUTTONDOWN() ON_WM_MOUSEMOVE() ON_WM_CONTEXTMENU() ON_COMMAND(ID_ELEMENT_MOVE, &CSketcherView::OnElementMove) ON_COMMAND(ID_ELEMENT_DELETE, &CSketcherView::OnElementDelete) ON_WM_RBUTTONDOWN() ON_COMMAND(ID_ELEMENT_SENDTOBACK, &CSketcherView::OnElementSendtoback) ON_COMMAND(ID_VIEW_SCALE, &CSketcherView::OnViewScale) END_MESSAGE_MAP() // CSketcherView construction/destruction CSketcherView::CSketcherView() : m_FirstPoint(0,0) , m_SecondPoint(0,0) , m_pTempElement(NULL) , m_pSelected(NULL) , m_MoveMode(FALSE) , m_CursorPos(CPoint(0,0)) , m_FirstPos(CPoint(0,0)) ,m_Scale(1) { SetScrollSizes(MM_TEXT, CSize(0,0)); // Set arbitrary scrollers } CSketcherView::~CSketcherView() { } BOOL CSketcherView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } // CSketcherView drawing void CSketcherView::OnDraw(CDC* pDC) { CSketcherDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if(!pDoc) return; POSITION aPos = pDoc->GetListHeadPosition(); CElement* pElement = 0; // Store for an element pointer while(aPos) // Loop while aPos is not null { pElement = pDoc->GetNext(aPos); // Get the current element pointer // If the element is visible... if(pDC->RectVisible(pElement->GetBoundRect())) pElement->Draw(pDC, m_pSelected);// ...draw it } } // CSketcherView printing BOOL CSketcherView::OnPreparePrinting(CPrintInfo* pInfo) { pInfo->m_lpUserData = new CPrintData; // Create a print data object CSketcherDoc* pDoc = GetDocument(); // Get a document pointer // Get the whole document area CRect DocExtent = pDoc->GetDocExtent(); // Save the reference point for the whole document ((CPrintData*)(pInfo->m_lpUserData))->m_DocRefPoint = CPoint(DocExtent.left, DocExtent.bottom); // Get the name of the document file and save it ((CPrintData*)(pInfo->m_lpUserData))->m_DocTitle = pDoc->GetTitle(); // Calculate how many printed page widths of 600 units are required // to accommodate the width of the document ((CPrintData*)(pInfo->m_lpUserData))->m_nWidths = static_cast<UINT>(ceil((static_cast<double>(DocExtent.Width()))/600.0)); // Calculate how many printed page lengths of 900 units are required // to accommodate the document length ((CPrintData*)(pInfo->m_lpUserData))->m_nLengths = static_cast<UINT>(ceil((static_cast<double>(DocExtent.Height()))/900.0)); // Set the first page number as 1 and // set the last page number as the total number of pages pInfo->SetMinPage(1); pInfo->SetMaxPage((static_cast<CPrintData*>(pInfo->m_lpUserData))->m_nWidths * (static_cast<CPrintData*>(pInfo->m_lpUserData))->m_nLengths); return DoPreparePrinting(pInfo); } void CSketcherView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add extra initialization before printing } void CSketcherView::OnEndPrinting(CDC* pDC, CPrintInfo* pInfo) { // Delete our print data object delete static_cast<CPrintData*>(pInfo->m_lpUserData); } // CSketcherView diagnostics #ifdef _DEBUG void CSketcherView::AssertValid() const { CView::AssertValid(); } void CSketcherView::Dump(CDumpContext& dc) const { CView::Dump(dc); } CSketcherDoc* CSketcherView::GetDocument() const // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CSketcherDoc))); return (CSketcherDoc*)m_pDocument; } #endif //_DEBUG // CSketcherView message handlers void CSketcherView::OnLButtonUp(UINT nFlags, CPoint point) { if(this == GetCapture()) ReleaseCapture(); // Stop capturing mouse messages // If there is an element, add it to the document if(m_pTempElement) { GetDocument()->AddElement(m_pTempElement); GetDocument()->UpdateAllViews(0,0,m_pTempElement); // Tell all the views m_pTempElement = 0; // Reset the element pointer } } void CSketcherView::OnLButtonDown(UINT nFlags, CPoint point) { CClientDC aDC(this); // Create a device context OnPrepareDC(&aDC); // Get origin adjusted aDC.DPtoLP(&point); // convert point to Logical // In moving mode, so drop the element if(m_MoveMode) { m_MoveMode = FALSE; // Kill move mode m_pSelected = 0; // De-select element GetDocument()->UpdateAllViews(0); // Redraw all the views GetDocument()->SetModifiedFlag(); // Set the modified flag } else { CSketcherDoc* pDoc = GetDocument();// Get a document pointer if(pDoc->GetElementType() == TEXT) { CTextDialog aDlg; if(aDlg.DoModal() == IDOK) { // Exit OK so create a text element CFont aFont; aFont.CreatePointFont(100, _T("")); CFont* pOldFont = aDC.SelectObject(&aFont); CSketcherDoc* pDoc = GetDocument(); CSize TextExtent = aDC.GetTextExtent(aDlg.m_TextString); // Get bottom right of text rectangle - MM_LOENGLISH CPoint BottomRt(point.x+TextExtent.cx, point.y-TextExtent.cy); CText* pTextElement = new CText(point, BottomRt, aDlg.m_TextString, pDoc->GetElementColor()); // Add the element to the document pDoc->AddElement(pTextElement); // Get all views updated pDoc->UpdateAllViews(0,0,pTextElement); aDC.SelectObject(pOldFont); } return; } m_FirstPoint = point; // Record the cursor position SetCapture(); // Capture subsequent mouse messages } } void CSketcherView::OnMouseMove(UINT nFlags, CPoint point) { // Define a Device Context object for the view CClientDC aDC(this); // DC is for this view OnPrepareDC(&aDC); // Get origin adjusted // If we are in move mode, move the selected element and return if(m_MoveMode) { aDC.DPtoLP(&point); // Convert to logical coordinatess MoveElement(aDC, point); // Move the element return; } aDC.SetROP2(R2_NOTXORPEN); // Set the drawing mode if((nFlags&MK_LBUTTON) && (this==GetCapture())) { aDC.DPtoLP(&point); // convert point to Logical m_SecondPoint = point; // Save the current cursor position if(m_pTempElement) { if(CURVE == GetDocument()->GetElementType()) // Is it a curve? { // We are drawing a curve // so add a segment to the existing curve static_cast<CCurve*>(m_pTempElement)->AddSegment(m_SecondPoint); m_pTempElement->Draw(&aDC); // Now draw it return; // We are done } aDC.SetROP2(R2_NOTXORPEN); // Set drawing mode // Redraw the old element so it disappears from the view m_pTempElement->Draw(&aDC); delete m_pTempElement; // Delete the old element m_pTempElement = 0;