在新建的MFC单文档文件中,选择类视图,在其中选择视图类,定义一个新的点类型变量myPoint,并在视图类构造函数中初始化为零。在鼠标单击按下事件内将当前点赋给myPoint,在抬起事件中,实现画矩形。
// lessonMyBrushView.cpp : implementation of the ClessonMyBrushView class // #include "stdafx.h" // SHARED_HANDLERS can be defined in an ATL project implementing preview, thumbnail // and search filter handlers and allows sharing of document code with that project. #ifndef SHARED_HANDLERS #include "lessonMyBrush.h" #endif #include "lessonMyBrushDoc.h" #include "lessonMyBrushView.h" #ifdef _DEBUG #define new DEBUG_NEW #endif // ClessonMyBrushView IMPLEMENT_DYNCREATE(ClessonMyBrushView, CView) BEGIN_MESSAGE_MAP(ClessonMyBrushView, CView) // Standard printing commands ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_PREVIEW, &ClessonMyBrushView::OnFilePrintPreview) ON_WM_CONTEXTMENU() ON_WM_RBUTTONUP() ON_WM_LBUTTONUP() ON_WM_LBUTTONDOWN() END_MESSAGE_MAP() // ClessonMyBrushView construction/destruction ClessonMyBrushView::ClessonMyBrushView() : myPoint(0) { // TODO: add construction code here } ClessonMyBrushView::~ClessonMyBrushView() { } BOOL ClessonMyBrushView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } // ClessonMyBrushView drawing void ClessonMyBrushView::OnDraw(CDC* /*pDC*/) { ClessonMyBrushDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; // TODO: add draw code for native data here } // ClessonMyBrushView printing void ClessonMyBrushView::OnFilePrintPreview() { #ifndef SHARED_HANDLERS AFXPrintPreview(this); #endif } BOOL ClessonMyBrushView::OnPreparePrinting(CPrintInfo* pInfo) { // default preparation return DoPreparePrinting(pInfo); } void ClessonMyBrushView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add extra initialization before printing } void ClessonMyBrushView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add cleanup after printing } void ClessonMyBrushView::OnRButtonUp(UINT /* nFlags */, CPoint point) { ClientToScreen(&point); OnContextMenu(this, point); } void ClessonMyBrushView::OnContextMenu(CWnd* /* pWnd */, CPoint point) { #ifndef SHARED_HANDLERS theApp.GetContextMenuManager()->ShowPopupMenu(IDR_POPUP_EDIT, point.x, point.y, this, TRUE); #endif } // ClessonMyBrushView diagnostics #ifdef _DEBUG void ClessonMyBrushView::AssertValid() const { CView::AssertValid(); } void ClessonMyBrushView::Dump(CDumpContext& dc) const { CView::Dump(dc); } ClessonMyBrushDoc* ClessonMyBrushView::GetDocument() const // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(ClessonMyBrushDoc))); return (ClessonMyBrushDoc*)m_pDocument; } #endif //_DEBUG // ClessonMyBrushView message handlers void ClessonMyBrushView::OnLButtonUp(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default //CBitmap bitmap; CBrush brush(RGB(255,0,0)); CClientDC ccdc(this); ccdc.FillRect(CRect(myPoint,point),&brush); CView::OnLButtonUp(nFlags, point); } void ClessonMyBrushView::OnLButtonDown(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default myPoint=point; CView::OnLButtonDown(nFlags, point); }