用双缓冲处理文字

2007-11-21 02:28:22 86 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Winform纵向文字标签终极解决方案：告别文字重叠与擦除残留本文深入探讨了Winform中纵向文字标签的终极解决方案，解决了文字重叠与擦除残留等常见问题。通过System.Drawing.Graphics和双缓冲技术，实现了高效的纵向文本渲染，特别适用于C#开发中的复杂UI需求。文章详细介绍了工业级架构设计、像素级清理算法和性能优化技巧，为开发者提供了一套完整的实现方案。阅读详情

用双缓冲处理文字 .
我在内存缓冲中输出文字,
MemDC.TextOut(0,46,stemp);
但是最后显示不出来?

但是我在内存缓冲中画线就可以.
MemDC.MoveTo(0,0);
MemDC.LineTo(60,60);

我想在内存缓冲中写文字, 然后利用选取不同的区域,实现文字被切割的样子.
代码如下:
int nWidth,nHeight;
nWidth = 120;
nHeight = 120;

CFont m_fntArial;
CFont* pOldFont;
BOOL bSuccess;
BOOL bUnderline;
BOOL bItalic;

bUnderline = FALSE;
bItalic = FALSE;
RECT ScrollRect;

PAINTSTRUCT ps;
CDC* pDc = this-> BeginPaint(&ps);
pDc-> SetBkMode(TRANSPARENT);

CDC MemDC;
CPen NewPen, *pOldPen;
NewPen.CreatePen(PS_SOLID, 2, BLUE);

CString stemp;

//pDc-> SelectObject(m_pBrush[m_nBrushColor]);

CBrush bBrush(BLACK);
CBitmap MemBitmap;
MemDC.CreateCompatibleDC(NULL);
MemBitmap.CreateCompatibleBitmap(pDc,100,60);
CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);
pOldPen = MemDC.SelectObject(&NewPen);

bSuccess = m_fntArial.CreateFont(NORMAL_TEXT_HEIGHT, 0, 0, 0,
FW_THIN, bItalic, bUnderline, 0,
ANSI_CHARSET,
OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,
PROOF_QUALITY,
VARIABLE_PITCH ¦ 0x04 ¦ FF_DONTCARE,
(LPSTR) "Arial ");
MemDC.SetTextColor(NORMAL_TEXT_COLOR);
pOldFont = MemDC.SelectObject(&m_fntArial);

if (m_nPosition == 0)
{
if (m_nCurrLine < LINECOUNT)
{
ScrollRect.bottom = 15;
ScrollRect.left = 0;
ScrollRect.right = 100;
ScrollRect.top =0;
stemp = pArrCredit[m_nCurrLine];
MemDC.FillRect(&ScrollRect,&bBrush);
MemDC.DrawText((const char *)pArrCredit[m_nCurrLine],stemp.GetLength(),&ScrollRect,DT_TOP ¦DT_CENTER ¦
DT_NOPREFIX ¦ DT_SINGLELINE);
}

if ((m_nCurrLine + 1) < LINECOUNT)
{
ScrollRect.top = 16;
ScrollRect.bottom = 30;
stemp = pArrCredit[m_nCurrLine+1];
MemDC.FillRect(&ScrollRect,&bBrush);
MemDC.DrawText((const char *)pArrCredit[m_nCurrLine + 1],stemp.GetLength(),&ScrollRect,DT_TOP ¦DT_CENTER ¦
DT_NOPREFIX ¦ DT_SINGLELINE);
}

if ((m_nCurrLine + 2) < LINECOUNT)
{
ScrollRect.top = 31;
ScrollRect.bottom = 45;
stemp = pArrCredit[m_nCurrLine+2];
MemDC.FillRect(&ScrollRect,&bBrush);
MemDC.DrawText((const char *)pArrCredit[m_nCurrLine + 2],stemp.GetLength(),&ScrollRect,DT_TOP ¦DT_CENTER ¦
DT_NOPREFIX ¦ DT_SINGLELINE);
}

if ((m_nCurrLine + 3) < LINECOUNT)
{
ScrollRect.top = 46;
ScrollRect.bottom = 60;
stemp = pArrCredit[m_nCurrLine+3];
MemDC.FillRect(&ScrollRect,&bBrush);
MemDC.DrawText((const char *)pArrCredit[m_nCurrLine + 3],stemp.GetLength(),&ScrollRect,DT_TOP ¦DT_CENTER ¦
DT_NOPREFIX ¦ DT_SINGLELINE);
}

MemDC.SelectObject(pOldFont);
m_nPosition++;
}

ScrollRect.bottom = 15;
ScrollRect.left = 0;
ScrollRect.right = 100;
ScrollRect.top =0;
pDc-> FillRect(&ScrollRect,&bBrush);

ScrollRect.top = 20;
ScrollRect.bottom = 35;
pDc-> FillRect(&ScrollRect,&bBrush);

ScrollRect.top = 40;
ScrollRect.bottom = 55;
pDc-> FillRect(&ScrollRect,&bBrush);

pDc-> BitBlt(0,0,100,15,&MemDC,0,m_nPosition,SRCCOPY);
pDc-> BitBlt(0,20,100,15,&MemDC,0,m_nPosition+15,SRCCOPY);
pDc-> BitBlt(0,40,100,15,&MemDC,0,m_nPosition+30,SRCCOPY);

MemBitmap.DeleteObject();
MemDC.SelectObject(pOldPen);
MemDC.DeleteDC();

this-> EndPaint(&ps);

CDialog::OnPaint();

或者大家有没有什么别的好的实现方法啊？

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