CDC: 滚动显示文字的实现

//pDC由CView::OnDraw(CDC* pDC)得到;

//m_strTitle为要显示的文本内容;

CString strShow = m_strTitle;

if( m_bTimeReDraw )

{

nLeft ++;

//m_bTimeReDraw = FALSE;

}

//pDC->TextOut(m_rect.left - nLeft + m_rect.Width() /2 ,m_rect.top+ 2 ,strShow );

CDC oDCMemory; oDCMemory.CreateCompatibleDC( pDC );

CBitmap oBitmap; oBitmap.CreateCompatibleBitmap( pDC, m_rtClient.Width(),m_rtClient.Height());

oDCMemory.SelectObject( &oBitmap );

//CPen oPen;

//oPen.CreatePen(PS_SOLID,1,RGB(122,122,122));

//oDCMemory.SelectObject( &oPen );

//CBrush oBrush( RGB(0,122,122 ) );

//oDCMemory.SelectObject( &oBrush );

//oDCMemory.SetBkMode( TRANSPARENT );

//oDCMemory.SelectStockObject(SYSTEM_FIXED_FONT);

oDCMemory.FillSolidRect( oRectRow, clrBakLed );

oDCMemory.SetTextColor( RGB(255,0,0 ) );

CFont oFont; 

oFont.CreateFont(14, 0,0,0, FW_NORMAL, 0,0,0, DEFAULT_CHARSET,

OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY,

DEFAULT_PITCH | FF_DONTCARE, "宋体");

oDCMemory.SelectObject(&m_Font);

oDCMemory.TextOut( 0 + m_rect.Width(), 0, strShow );

//oDCMemory.TextOut( oSizeTxt.cx - nLeft, 0, strShow );

 

CSize oSizeTxt = oDCMemory.GetTextExtent( strShow );

CBrush oBrush( clrBakLed );

oDCMemory.SelectObject( &clrBakLed );

//oDCMemory.Rectangle( oSizeTxt.cx - nLeft + 1, 0, oSizeTxt.cx, oSizeTxt.cy );

if( nLeft > oSizeTxt.cx + m_rect.Width() - 1 )

nLeft = 0;

pDC->BitBlt( m_rect.left + 1, m_rect.top + 2, m_rect.Width() - 2, oSizeTxt.cy ,&oDCMemory, nLeft, 0, SRCCOPY );

if( m_bTimeReDraw )

{

m_bTimeReDraw = FALSE;

}