用VC制作带有滚动字幕的软件封面
用VC制作带有滚动字幕的软件封面 软件启动时,常常需要自下而上循环滚动显示一些诸如软件名称、功能、版本、用户名、研制单位等信息的文字,在用户按任意键或点击鼠标键后,立即结束演示进入程序主界面。本文在VC中通过向工程中添加Splash screen组件,然后扩展CSplashWnd类方便地实现了这一功能。设计步骤如下: 1.创建一个名为test的SDI工程; 2.向工程中添加Splash screen组件,即添加CSplashWnd类; 3.导入软件封面的位图资源,标识号为IDB_SPLASH; 4.向CSplashWnd类中添加函数DrawText,在软件封面中显示文字。代码如下: void CSplashWnd::DrawText(CDC *pDC, int x, int y, int nAlign, CString sFontName, int nFONTSIZE0,COLORREF crTextColor, CString sText) { //pDC:内存dc,x,y:文字位置,nAlign:对齐方式 //sFont:字体,nFONTSIZE0:字号,crTextColor:文字颜色,sText:正文 LOGFONT lf;//字体 lf.lfStrikeOut=0;//删除线 lf.lfCharSet = DEFAULT_CHARSET ;//字符集 lf.lfEscapement =0;//角度 lf.lfItalic = 0 ;//倾斜 lf.lfUnderline = 0 ;//下划线 lf.lfHeight = nFONTSIZE0 ;//字号 strcpy(lf.lfFaceName,sFaceName.GetBuffer(sFontName.GetLength())); CFont font ; font.CreateFontIndirect(&lf); CFont *pOldFont = (CFont *)pDC->SelectObject(&font); UINT oldAlign,uAlign ; switch(nAlign) { case 0: uAlign = TA_LEFT TA_TOP ; break; case 1: uAlign = TA_CENTER TA_TOP; break; case 2: uAlign = TA_RIGHT TA_TOP ; break; default: uAlign = TA_LEFT TA_TOP ; break; } oldAlign = pDC->SetTextAlign(uAlign); int oldMode = pDC->SetBkMode(TRANSPARENT); int oldColor = pDC->SetTextColor(crTextColor) ; pDC->TextOut(x,y,sText);pDC->SetTextColor(oldColor) ; pDC->SetTextAlign(oldAlign); pDC->SetBkMode(oldMode); pDC->SelectObject(pOldFont); font.DeleteObject(); } 5. 给CSplashWnd类中添加以下变量,并在构造函数中加入初始化代码; class CSplashWnd : public CWnd {public: CDC m_dcText,m_dcImage;//显示dc的兼容内存dc CBitmap* m_pBitmap;//位图对象指针 CBitmap* m_pOldBitmapText,*m_pOldBitmap;//跟踪内存dc中的原位图 CRgn m_rgn;//用于生成矩形区域 CRect m_TextRect ;//显示文字的矩形区域 int m_nCurPos ;//文字当前位置 } CSplashWnd::CSplashWnd() { m_nCurPos = 50 ; } 6.设置显示文字的矩形区域。 BOOL CSplashWnd::Create(CWnd* pParentWnd /*= NULL*/) { m_TextRect.CopyRect(&CRect(50,100,500,300)); } 7.添加 WM_PAINT消息处理函数,调用CSplashWnd::DrawText显示文字。 void CSplashWnd::OnPaint() { CPaintDC dc(this); BITMAP bm; m_bitmap.GetBitmap(&bm); static BOOL bFirst = TRUE;//指示是否第一次绘制窗口 if(bFirst) { if (!m_dcImage.CreateCompatibleDC(&dc)) return; m_pOldBitmap = m_dcImage.SelectObject(&m_bitmap); if (!m_dcText.CreateCompatibleDC(&dc)) return; m_pBitmap = new CBitmap ; int nBitCount = m_dcText.GetDeviceCaps(BITSPIXEL); m_pBitmap->CreateBitmap(bm.bmWidth,bm.bmHeight,1,nBitCount,NULL); m_pOldBitmapText = m_dcText.SelectObject(m_pBitmap); m_rgn.CreateRectRgn(m_TextRect.left,m_TextRect.top, m_TextRect.right,m_TextRect.bottom); bFirst = FALSE; } m_dcText.SelectClipRgn(NULL); m_dcText.BitBlt(0, 0, bm.bmWidth, bm.bmHeight,&m_dcImage, 0, 0, SRCCOPY); m_dcText.SelectClipRgn(&m_rgn); int nBasex = m_TextRect.left ; int nBasey = m_TextRect.bottom-m_nCurPos; int nMidx = m_TextRect.left + m_TextRect.Width()/2 ; DrawText(&m_dcText,nMidx,nBasey, 1, "楷体_GB2312",20, RGB(0,0,255) ,"研制单位"); DrawText(&m_dcText,nMidx,nBasey+30, 1, "楷体_GB2312",15, RGB(0,255,255) ,"武警指挥学院模拟中心"); dc.BitBlt(0, 0, bm.bmWidth, bm.bmHeight,&m_dcText, 0,0, SRCCOPY); } 8.改变文字垂向位置,出现循环滚动效果: void CSplashWnd::OnTimer(UINT nIDEvent) { m_nCurPos++; if( m_nCurPos>300 ) //循环 { m_nCurPos = 0 ; } Invalidate(TRUE); } 9. 演示软件封面时,隐藏主框架窗口: BOOL CTestApp::InitInstance() { m_pMainWnd->ShowWindow(SW_HIDE); m_pMainWnd->UpdateWindow(); } 10.按任意键或点击鼠标键结束封面演示: LRESULT CSplashWnd::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) { if (c_pSplashWnd) { if (message == WM_KEYDOWN message == WM_SYSKEYDOWN message == WM_LBUTTONDOWN message == WM_RBUTTONDOWN message == WM_MBUTTONDOWN message == WM_NCLBUTTONDOWN message == WM_NCRBUTTONDOWN message == WM_NCMBUTTONDOWN) { c_pSplashWnd->HideSplashScreen(); AfxGetMainWnd()->ShowWindow(SW_MAXIMIZE); return TRUE; } } return CWnd::WindowProc(message, wParam, lParam); } 11.封面窗口销毁后,释放有关对象: void CSplashWnd::PostNcDestroy() { m_dcImage.SelectObject(m_pOldBitmap); m_dcText.SelectClipRgn(NULL); m_dcText.SelectObject(m_pOldBitmapText); m_bitmap.DeleteObject(); m_rgn.DeleteObject(); delete this; } 文中程序在Windows9、Visual C++ 6.0下运行通过。 |
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