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.h頭文件 
  
 #pragma once 
  
 class CCrossDrawer 
 { 
 public: 
 	CCrossDrawer(void); 
 	~CCrossDrawer(void); 
  
 	void Restart(); 
  
 	void OnMouseMove(UINT nFlag, CPoint pt, CView* pView); 
 	void Render(CDC* pDC); 
  
 	void AddLine(CString strText); 
 	void ClearTexts(); 
  
 protected: 
 	CPoint m_ptPre;		// 鼠標(biāo)點(diǎn) 
 	CRect m_rectClient;	// 客戶區(qū)區(qū)域矩形 
  
 	UINT m_nTextHeight;	// 文字總高度 
 	UINT m_nTextWidth;	// 文字總寬度 
 	CPoint m_ptTextPos;	// 文字的輸出位置 
  
 public: 
 	COLORREF m_clrLine;	// 十字線顏色 
 	int m_nDstX;	// 文字邊框到鼠標(biāo)的橫向距離 
 	int m_nDstY;	// 文字邊框到鼠標(biāo)的縱向距離 
 	int m_nExtText;	// 文字到文字邊框的距離 
 	std::vector <CString> m_Texts;	// 文字提示信息 
 }; 
  
  
 

.cpp實(shí)現(xiàn)文件#include "StdAfx.h"#include ".\crossdrawer.h"CCrossDrawer::CCrossDrawer(void):m_ptPre(-999,-999),m_ptTextPos(-999,-999){    m_clrLine = RGB(0,0,0);    m_nDstX = 8;    m_nDstY = 16;    m_nExtText = 3;    m_nTextHeight = m_nTextWidth = 0;    CString strInit = _T("文字提示信息......第01行");    m_Texts.push_back(strInit);    strInit.Format(_T("文字提示信息......第02行"));    m_Texts.push_back(strInit);    strInit.Format(_T("文字提示信息......第XXX行"));    m_Texts.push_back(strInit);}CCrossDrawer::~CCrossDrawer(void){}void CCrossDrawer::OnMouseMove( UINT nFlag, CPoint pt, CView* pView ){    pView->GetClientRect(&m_rectClient);    CClientDC dc(pView);    pView->OnPrepareDC(&dc);    dc.DPtoLP(&m_rectClient);    m_rectClient.NormalizeRect();    m_ptPre = pt;    dc.DPtoLP(&m_ptPre);    // 計(jì)算文字的寬高    // 找到最長(zhǎng)字符串的下標(biāo)    int nMaxIndex = 0;    int nLines = m_Texts.size();    for (UINT i = 0; i < nLines; i++)    {        if (m_Texts[nMaxIndex].GetLength() < m_Texts[i].GetLength())            nMaxIndex = i;    }    // 選入字體    LOGFONT logfont = { -18,0,0,0,400,0,0,0,134,3,2,1,2, _T("宋體") };    //logfont.lfHeight = Sim2DHelper::FontSizeToLP(&dc, logfont.lfHeight);    CSize szHeight(0, logfont.lfHeight);    dc.DPtoLP(&szHeight);    logfont.lfHeight = szHeight.cy;    CFont font;        font.CreateFontIndirect(&logfont);    CFont* pOldFont = dc.SelectObject(&font);    CSize szTextExtent;    if (!m_Texts.empty()) szTextExtent = dc.GetTextExtent(m_Texts[nMaxIndex]);    else szTextExtent = dc.GetTextExtent(_T(""));    m_nTextWidth = szTextExtent.cx;    m_nTextHeight = szTextExtent.cy*nLines;    // 計(jì)算文字輸出位置    CSize sizeOffset(m_nDstX, m_nDstY);    dc.DPtoLP(&sizeOffset);    sizeOffset.cy *= -1;    m_ptTextPos.x = m_ptPre.x + sizeOffset.cx;    m_ptTextPos.y = m_ptTextPos.y = m_ptPre.y + sizeOffset.cy;    if ( (LONG)(m_ptPre.x + sizeOffset.cx + m_nTextWidth) >= m_rectClient.right)    {        m_ptTextPos.x = m_ptPre.x - sizeOffset.cx - m_nTextWidth;    }    if ((LONG)(m_ptPre.x - sizeOffset.cx - m_nTextWidth) <= m_rectClient.left )    {        m_ptTextPos.x = m_ptPre.x + sizeOffset.cx;    }    if ((LONG)(m_ptPre.y + sizeOffset.cy - m_nTextHeight) <= m_rectClient.top)    {        m_ptTextPos.y = m_ptPre.y - sizeOffset.cy + m_nTextHeight;    }    if ((LONG)(m_ptPre.y - sizeOffset.cy + m_nTextHeight) >= m_rectClient.bottom)    {        m_ptTextPos.y = m_ptPre.y + sizeOffset.cy;    }    pView->Invalidate(FALSE);}void CCrossDrawer::Restart(){    m_ptPre.SetPoint(-999,-999);}void CCrossDrawer::Render( CDC* pDC ){    if (m_ptPre.x != -999)    {        CPen pen(PS_DOT, 0, m_clrLine);        CPen* pOldpen = pDC->SelectObject(&pen);        pDC->MoveTo(CPoint(m_ptPre.x, m_rectClient.top));        pDC->LineTo(CPoint(m_ptPre.x, m_rectClient.bottom));        pDC->MoveTo(CPoint(m_rectClient.left, m_ptPre.y));        pDC->LineTo(CPoint(m_rectClient.right, m_ptPre.y));        pDC->SelectObject(pOldpen);        if (!m_Texts.empty())        {            // 以下繪制文字提示框            //// 計(jì)算文字左上角            //CSize sizeOffset(m_nDstX, m_nDstY);            //pDC->DPtoLP(&sizeOffset);    sizeOffset.cy *= -1;            //CPoint m_ptTextPos = m_ptPre + sizeOffset;            // 計(jì)算文本矩形框并繪制            // 找到最長(zhǎng)字符串的下標(biāo)            int nMaxIndex = 0;            int nLines = m_Texts.size();            for (UINT i = 0; i < nLines; i++)            {                if (m_Texts[nMaxIndex].GetLength() < m_Texts[i].GetLength())                    nMaxIndex = i;            }            // 選入字體            LOGFONT logfont = { -13,0,0,0,400,0,0,0,134,3,2,1,2, _T("宋體") };            //logfont.lfHeight = Sim2DHelper::FontSizeToLP(pDC, logfont.lfHeight);            CSize szHeight(0, logfont.lfHeight);            pDC->DPtoLP(&szHeight);            logfont.lfHeight = szHeight.cy;            CFont font;        font.CreateFontIndirect(&logfont);            CFont* pOldFont = pDC->SelectObject(&font);            // 計(jì)算矩形            CSize szTextExtent = pDC->GetTextExtent(m_Texts[nMaxIndex]);            CRect rtTexts(m_ptTextPos.x, m_ptTextPos.y, m_ptTextPos.x + szTextExtent.cx, m_ptTextPos.y - szTextExtent.cy*nLines);            rtTexts.NormalizeRect();            CSize szDstText(m_nExtText, m_nExtText);    pDC->DPtoLP(&szDstText);            rtTexts.InflateRect(szDstText);            CBrush brh(RGB(238,245,201));            CBrush* pOldBrh = pDC->SelectObject(&brh);            pDC->Rectangle(rtTexts);            pDC->SelectObject(pOldBrh);            // 繪制文字信息            int nOldBkMode = pDC->SetBkMode(TRANSPARENT);            for (UINT i = 0; i < nLines; i++)            {                pDC->TextOut(m_ptTextPos.x, m_ptTextPos.y - i*szTextExtent.cy, m_Texts[i]);            }            pDC->SetBkMode(nOldBkMode);            pDC->SelectObject(pOldFont);        }    }}void CCrossDrawer::AddLine( CString strText ){    if (strText.GetLength() < 4)        return;    m_Texts.push_back(strText);}void CCrossDrawer::ClearTexts(){    m_Texts.clear();}