CRectTracker类（即俗称的橡皮筋）的使用

// trackvw.cpp : implementation of the CTrackerView class // // This is a part of the Microsoft Foundation Classes C++ library. // Copyright (C) 1992-1998 Microsoft Corporation // All rights reserved. // // This source code is only intended as a supplement to the // Microsoft Foundation Classes Reference and related // electronic documentation provided with the library. // See these sources for detailed information regarding the // Microsoft Foundation Classes product. #include "stdafx.h" #include "trackapp.h" #include "trackdoc.h" #include "trackvw.h" #include "dialogs.h" #ifdef _DEBUG #undef THIS_FILE static char BASED_CODE THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CTrackerView IMPLEMENT_DYNCREATE(CTrackerView, CView) BEGIN_MESSAGE_MAP(CTrackerView, CView) //{{AFX_MSG_MAP(CTrackerView) ON_WM_LBUTTONDOWN() ON_WM_SETCURSOR() ON_COMMAND(ID_VIEW_SETHANDLESIZE, OnViewSethandlesize) ON_COMMAND(ID_VIEW_SETMINIMUMSIZE, OnViewSetminimumsize) //}}AFX_MSG_MAP // Standard printing commands ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview) END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CTrackerView construction/destruction CTrackerView::CTrackerView() { // TODO: add construction code here } CTrackerView::~CTrackerView() { } ///////////////////////////////////////////////////////////////////////////// // CTrackerView drawing static void SetNormalRect(CRect& rect, int left, int top, int width, int height) { // set it rect.left = left; rect.top = top; rect.right = left + width; rect.bottom = top + height; // normalize it int nTemp; if (rect.left > rect.right) { nTemp = rect.left; rect.left = rect.right; rect.right = nTemp; } if (rect.top > rect.bottom) { nTemp = rect.top; rect.top = rect.bottom; rect.bottom = nTemp; } } void CTrackerView::OnDraw(CDC* pDC) { CTrackerDoc* pDoc = GetDocument(); CBrush* pOldBrush = NULL; TRY { // draw inside in various colors CBrush brush1, brush2; CRect rect; int nWidth = pDoc->m_tracker.m_rect.Width(); int nHeight = pDoc->m_tracker.m_rect.Height(); int nSgnX = nWidth != 0 ? nWidth / abs(nWidth) : 1; int nSgnY = nHeight != 0 ? nHeight / abs(nHeight) : 1; pDC->SetTextAlign(TA_CENTER); pDC->SetBkMode(TRANSPARENT); int nCenterX, nCenterY; TEXTMETRIC tm; pDC->GetTextMetrics(&tm); brush1.CreateSolidBrush(RGB(255, 0, 0)); pOldBrush = pDC->SelectObject(&brush1); SetNormalRect(rect, pDoc->m_tracker.m_rect.left, pDoc->m_tracker.m_rect.top, nWidth/2, nHeight/2); pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY); nCenterX = rect.left + rect.Width()/2; nCenterY = rect.top + rect.Height()/2 - tm.tmHeight/2; pDC->ExtTextOut(nCenterX, nCenterY, ETO_CLIPPED, rect, _T("1"), 1, NULL); brush2.CreateSolidBrush(RGB(0, 255, 0)); pDC->SelectObject(&brush2); brush1.DeleteObject(); SetNormalRect(rect, pDoc->m_tracker.m_rect.left+nWidth/2, pDoc->m_tracker.m_rect.top, (nWidth+nSgnX)/2, nHeight/2); pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY); nCenterX = rect.left + rect.Width()/2; nCenterY = rect.top + rect.Height()/2 - tm.tmHeight/2; pDC->ExtTextOut(nCenterX, nCenterY, ETO_CLIPPED, rect, _T("2"), 1, NULL); brush1.CreateSolidBrush(RGB(0, 0, 255)); pDC->SelectObject(&brush1); brush2.DeleteObject(); SetNormalRect(rect, pDoc->m_tracker.m_rect.left, pDoc->m_tracker.m_rect.top+nHeight/2, nWidth/2, (nHeight+nSgnY)/2); pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY); nCenterX = rect.left + rect.Width()/2; nCenterY = rect.top + rect.Height()/2 - tm.tmHeight/2; pDC->ExtTextOut(nCenterX, nCenterY, ETO_CLIPPED, rect, _T("3"), 1, NULL); brush2.CreateSolidBrush(RGB(192, 192, 192)); pDC->SelectObject(&brush2); brush1.DeleteObject(); SetNormalRect(rect, pDoc->m_tracker.m_rect.left+nWidth/2, pDoc->m_tracker.m_rect.top+nHeight/2, (nWidth+nSgnX)/2, (nHeight+nSgnY)/2); pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY); nCenterX = rect.left + rect.Width()/2; nCenterY = rect.top + rect.Height()/2 - tm.tmHeight/2; pDC->ExtTextOut(nCenterX, nCenterY, ETO_CLIPPED, rect, _T("4"), 1, NULL); // cleanup DC if (pOldBrush != NULL) pDC->SelectObject(pOldBrush); brush2.DeleteObject(); // draw tracker on outside pDoc->m_tracker.Draw(pDC); } CATCH_ALL(e) { if (pOldBrush != NULL) pDC->SelectObject(pOldBrush); } END_CATCH_ALL } ///////////////////////////////////////////////////////////////////////////// // CTrackerView printing BOOL CTrackerView::OnPreparePrinting(CPrintInfo* pInfo) { // default preparation return DoPreparePrinting(pInfo); } void CTrackerView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add extra initialization before printing } void CTrackerView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add cleanup after printing } ///////////////////////////////////////////////////////////////////////////// // CTrackerView diagnostics #ifdef _DEBUG void CTrackerView::AssertValid() const { CView::AssertValid(); } void CTrackerView::Dump(CDumpContext& dc) const { CView::Dump(dc); } CTrackerDoc* CTrackerView::GetDocument() // non-debug version is inline { return STATIC_DOWNCAST(CTrackerDoc, m_pDocument); } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CTrackerView update void CTrackerView::OnUpdate(CView* /*pSender*/, LPARAM lHint, CObject* /*pHint*/) { if (lHint == 0) { CRect rectTrue; CTrackerDoc* pDoc = GetDocument(); pDoc->m_tracker.GetTrueRect(&rectTrue); InvalidateRect(rectTrue); } else { InvalidateRect((CRect*)lHint); } } ///////////////////////////////////////////////////////////////////////////// // CTrackerView message handlers void CTrackerView::OnLButtonDown(UINT nFlags, CPoint point) { CTrackerDoc* pDoc = GetDocument(); CRect rectSave; pDoc->m_tracker.GetTrueRect(rectSave); if (pDoc->m_tracker.HitTest(point) < 0) { // just to demonstrate CRectTracker::TrackRubberBand CRectTracker tracker; if (tracker.TrackRubberBand(this, point, pDoc->m_bAllowInvert)) { MessageBeep(0); // beep indicates TRUE // see if rubber band intersects with the doc's tracker CRect rectT; tracker.m_rect.NormalizeRect(); // so intersect rect works if (rectT.IntersectRect(tracker.m_rect, pDoc->m_tracker.m_rect)) { // if so, put resize handles on it (ie. select it) if (pDoc->m_tracker.m_nStyle & CRectTracker::resizeInside) { // swap from resize inside to resize outside for effect pDoc->m_tracker.m_nStyle &= ~CRectTracker::resizeInside; pDoc->m_tracker.m_nStyle |= CRectTracker::resizeOutside; } else { // just use inside resize handles on first time pDoc->m_tracker.m_nStyle &= ~CRectTracker::resizeOutside; pDoc->m_tracker.m_nStyle |= CRectTracker::resizeInside; } pDoc->SetModifiedFlag(); pDoc->UpdateAllViews(NULL, (LPARAM)(LPCRECT)rectSave); pDoc->UpdateAllViews(NULL); } } } else if (pDoc->m_tracker.Track(this, point, pDoc->m_bAllowInvert)) { // normal tracking action, when tracker is "hit" pDoc->SetModifiedFlag(); pDoc->UpdateAllViews(NULL, (LPARAM)(LPCRECT)rectSave); pDoc->UpdateAllViews(NULL); } CView::OnLButtonDown(nFlags, point); } BOOL CTrackerView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) { // forward to tracker CTrackerDoc* pDoc = GetDocument(); if (pWnd == this && pDoc->m_tracker.SetCursor(this, nHitTest)) return TRUE; ret