MFC双缓存无闪烁画图

// OnPintView.cpp : COnPintView 类的实现 // #include "stdafx.h" #include "OnPint.h" #include "OnPintDoc.h" #include "OnPintView.h" #ifdef _DEBUG #define new DEBUG_NEW #endif // COnPintView IMPLEMENT_DYNCREATE(COnPintView, CView) BEGIN_MESSAGE_MAP(COnPintView, CView) // 标准打印命令 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_ERASEBKGND() ON_WM_TIMER() END_MESSAGE_MAP() // COnPintView 构造/析构 COnPintView::COnPintView() :m_nIndex(0) { // TODO: 在此处添加构造代码 } COnPintView::~COnPintView() { } BOOL COnPintView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: 在此处通过修改 // CREATESTRUCT cs 来修改窗口类或样式 return CView::PreCreateWindow(cs); } // COnPintView 绘制 void COnPintView::OnDraw(CDC* /*pDC*/) { COnPintDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; // TODO: 在此处为本机数据添加绘制代码 } // COnPintView 打印 BOOL COnPintView::OnPreparePrinting(CPrintInfo* pInfo) { // 默认准备 return DoPreparePrinting(pInfo); } void COnPintView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: 添加额外的打印前进行的初始化过程 } void COnPintView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: 添加打印后进行的清理过程 } // COnPintView 诊断 #ifdef _DEBUG void COnPintView::AssertValid() const { CView::AssertValid(); } void COnPintView::Dump(CDumpContext& dc) const { CView::Dump(dc); } COnPintDoc* COnPintView::GetDocument() const // 非调试版本是内联的 { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(COnPintDoc))); return (COnPintDoc*)m_pDocument; } #endif //_DEBUG // COnPintView 消息处理程序 BOOL COnPintView::OnEraseBkgnd(CDC* pDC) { // TODO: 在此添加消息处理程序代码和/或调用默认值 CBitmap bitmap; CRect rect; //GetClientRect(&rect); GetWindowRect(&rect); CDC dcMemory; dcMemory.CreateCompatibleDC(NULL); bitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height()); CBitmap* pOldBitmap = dcMemory.SelectObject(&bitmap); dcMemory.FillSolidRect(rect,RGB(255,255,255)); //画背景图在内存上 CBitmap btm; if(m_nIndex == 0) { btm.LoadBitmap(IDB_BITMAP1); } else { btm.LoadBitmap(IDB_BITMAP2); } GetClientRect(rect); BITMAP bm; CDC dcMem; VERIFY(btm.GetObject(sizeof(bm),(LPVOID)&bm)); dcMem.CreateCompatibleDC(pDC); CBitmap *pOldBMP =( CBitmap *)dcMem.SelectObject(&btm); dcMemory.BitBlt( (rect.right - bm.bmWidth)/2,(rect.bottom - bm.bmHeight)/2,bm.bmWidth,bm.bmHeight,&dcMem,0,0,SRCCOPY); dcMem.SelectObject(pOldBMP); dcMem.DeleteDC(); //显示在界面上 pDC->BitBlt(0, 0, rect.right, rect.bottom, &dcMemory,0, 0, SRCCOPY); dcMemory.SelectObject(pOldBitmap); dcMemory.DeleteDC(); bitmap.DeleteObject(); btm.DeleteObject(); //return CView::OnEraseBkgnd(pDC); return TRUE; } void COnPintView::OnTimer(UINT_PTR nIDEvent) { // TODO: 在此添加消息处理程序代码和/或调用默认值 if(nIDEvent == 101) { m_nIndex = abs(m_nIndex - 1); Invalidate(); } CView::OnTimer(nIDEvent); } void COnPintView::OnInitialUpdate() { CView::OnInitialUpdate(); SetTimer(101,1000,NULL); // TODO: 在此添加专用代码和/或调用基类 }