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怎樣實現動畫背景旗幟

編輯：vc教程

以下代碼是關於用類CmdiMainClIEnt來顯示動畫背景旗幟的一個例子。原理是很簡單的，我們只需要一系列連續的位圖，並且讓它連續顯示。在這個例子中你可以用鼠標的右鍵來開始/停止這個動畫，如果點左鍵的話，就可以顯示一個子窗口，來保持動畫是繼續。為了你的方便，你可以把代碼直接從浏覽器中拷貝下去，並且插到你的代碼中就行了。以下是代碼：

#include "stdafx.h"
#include "banner.h"
#include "mainfrm.h"

#include "resource.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMdiMainClIEnt

CMdiMainClient::CMdiMainClient(): m_sizeClIEnt(0, 0)

{
VERIFY(m_bmpBackGround.LoadBitmap(IDB_BCKGRD));
ASSERT(m_bmpBackGround.GetSafeHandle());

VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP0));
ASSERT(m_bmpBackGround2.GetSafeHandle());

BmpLoaded = 1;
StopRotation = FALSE;
}

CMdiMainClient::~CMdiMainClIEnt()
{
if (m_bmpBackGround.GetSafeHandle())
m_bmpBackGround.DeleteObject();

if (m_bmpBackGround2.GetSafeHandle())
m_bmpBackGround2.DeleteObject();
}

BEGIN_MESSAGE_MAP(CMdiMainClIEnt, CWnd)
//{{AFX_MSG_MAP(CMdiMainClIEnt)
// NOTE - the ClassWizard will add and remove mapping Macros here.
ON_WM_TIMER()ON_WM_ERASEBKGND()ON_WM_RBUTTONDOWN()ON_WM_LBUTTONDOWN()ON_WM_SIZE
()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMdiMainClIEnt message handlers
BOOL CMdiMainClIEnt::OnEraseBkgnd(CDC *pDC)
{
// Erase only the area needed
CRect rect;
GetClIEntRect(&rect);

SetTimer(0, 300, NULL);

// Place the bitmap
BITMAP bm;
CDC dcMem;

BITMAP bm2;
CDC dcMem2;

VERIFY(m_bmpBackGround.GetObject(sizeof(bm), (LPVOID) &bm));
dcMem.CreateCompatibleDC(NULL);
CBitmap *pbmpOld = (CBitmap*)dcMem.SelectObject(&m_bmpBackGround);
ASSERT(pbmpOld);
// Display red background
pDC->StretchBlt(0, 0, rect.right, rect.bottom, &dcMem, 0, 0, bm.bmWidth,
bm.bmHeight, SRCCOPY);

VERIFY(m_bmpBackGround2.GetObject(sizeof(bm2), (LPVOID) &bm2));
dcMem2.CreateCompatibleDC(NULL);
dcMem2.SelectObject(&m_bmpBackGround2);
// Display picture background
pDC->StretchBlt(200, 100, 400, 200, &dcMem2, 0, 0, bm2.bmWidth, bm2.bmHeight,
SRCCOPY);

// Display Instructions
pDC->SetBkColor(RGB(255, 0, 0));
pDC->SetTextColor(RGB(192, 192, 192));
pDC->TextOut(480, 500, "Mouse Right Click to Stop/Start Special Effects");
pDC->TextOut(480, 515, "Mouse Left-Click to Show Child Window");

// CleanUp
dcMem.SelectObject(pbmpOld);

return TRUE;
}

////////////////////////////////////////////////////////////////////
//
void CMdiMainClIEnt::OnSize(UINT nType, int cx, int cy)
{
Default();
// if the app is just starting up, save the window
// dimensions and get out

if ((m_sizeClient.cx == 0) && (m_sizeClIEnt.cy == 0))
{
m_sizeClIEnt.cx = cx;
m_sizeClIEnt.cy = cy;

return ;
}

// if the size hasn't changed, break and pass to default

if ((m_sizeClient.cx == cx) && (m_sizeClIEnt.cy == cy))
{
return ;
}

// window size has changed so save new dimensions and force
// entire background to redraw, including icon backgrounds

m_sizeClIEnt.cx = cx;
m_sizeClIEnt.cy = cy;

RedrawWindow(NULL, NULL, RDW_INVALIDATE | RDW_ERASE | RDW_ERASENOW |
RDW_ALLCHILDREN);

return ;
}

void CMdiMainClIEnt::OnTimer(UINT nIDEvent)
{
DisplayNextLogoFrame();
CWnd::OnTimer(nIDEvent);
}

void CMdiMainClIEnt::DisplayNextLogoFrame()
{
CRect rect;
GetClIEntRect(&rect);

BITMAP bm2;
CDC dcMem2;

CDC *pDC = GetDC();

if (!StopRotation)
{
    // Select next logo frame to be displayed
    switch (BmpLoaded)
    {
      case 1:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP1));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 2:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP2));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 3:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP3));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 4:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP4));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 5:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP5));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 6:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP6));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 7:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP7));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 8:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP8));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;
      case 9:
        if (m_bmpBackGround2.GetSafeHandle())
          m_bmpBackGround2.DeleteObject();
        VERIFY(m_bmpBackGround2.LoadBitmap(IDB_BITMAP9));
        ASSERT(m_bmpBackGround2.GetSafeHandle());
        break;

    }
    // Change Bitmap index
    if (BmpLoaded == 9)
      BmpLoaded = 0;
    else
      BmpLoaded++;
}

VERIFY(m_bmpBackGround2.GetObject(sizeof(bm2), (LPVOID) &bm2));
dcMem2.CreateCompatibleDC(NULL);
dcMem2.SelectObject(&m_bmpBackGround2);
pDC->StretchBlt(200, 100, 400, 200, &dcMem2, 0, 0, bm2.bmWidth, bm2.bmHeight,
SRCCOPY);

ReleaseDC(pDC);
}

void CMdiMainClIEnt::OnRButtonDown(UINT nFlags, CPoint point)
{
if (StopRotation)
StopRotation = FALSE;
else
StopRotation = TRUE;

CWnd::OnRButtonDown(nFlags, point);
}

void CMdiMainClIEnt::OnLButtonDown(UINT nFlags, CPoint point)
{
m_Hide_Logo = TRUE;
KillTimer(0);

// Display Application
((CBannerApp*)AfxGetApp())->pDocTemplate->OpenDocumentFile(NULL);

CWnd::OnLButtonDown(nFlags, point);
}

// MdiMainClIEnt.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CMdiMainClIEnt window

extern BOOL m_Hide_Logo;

class CMdiMainClIEnt: public CWnd
{
// Construction
public:
CMdiMainClIEnt();

    // Attributes
protected:
    CBitmap m_bmpBackGround2;
    CBitmap m_bmpBackGround;

    int BmpLoaded;
public:
    BOOL StopRotation;
    CSize m_sizeClIEnt;

    // Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CMdiMainClIEnt)
    //}}AFX_VIRTUAL

    // Implementation
public:
    void Display_Blank_Bitmap();
    void DisplayNextLogoFrame();
    virtual ~CMdiMainClIEnt();
    // Generated message map functions
protected:
    //{{AFX_MSG(CMdiMainClIEnt)
    // NOTE - the ClassWizard will add and remove member functions here.
    afx_msg BOOL OnEraseBkgnd(CDC *pDC);
    afx_msg void OnSize(UINT nType, int cx, int cy);
    afx_msg void OnTimer(UINT nIDEvent);
    afx_msg void OnRButtonDown(UINT nFlags, CPoint point);
    afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};