Question

我的应用程序中有一些代码用于选择字体。它以可视方式显示当前字体的样本：

代码就在这里：

a.reshape(3,3,9,9).transpose((0,2,1,3)).reshape(27,27)

#array([[  0,   1,   2,   3,   4,   5,   6,   7,   8,  81,  82,  83,  84,
#         85,  86,  87,  88,  89, 162, 163, 164, 165, 166, 167, 168, 169,
#        170],
#       [  9,  10,  11,  12,  13,  14,  15,  16,  17,  90,  91,  92,  93,
#         94,  95,  96,  97,  98, 171, 172, 173, 174, 175, 176, 177, 178,
#        179],
#  ... 
#       [558, 559, 560, 561, 562, 563, 564, 565, 566, 639, 640, 641, 642,
#        643, 644, 645, 646, 647, 720, 721, 722, 723, 724, 725, 726, 727,
#        728]])

现在，我有其他代码显示标准void CExportSettingsDlg::OnPaint() { CPaintDC dc( this ); // device context for painting // This will draw the sample text for us using the current font DrawSampleText( &dc ); // Do not call CDialog::OnPaint() for painting messages } void CExportSettingsDlg::DrawSampleText(CDC *pDC) { CDC dcMem; CPen *pOldPen; CBrush *pOldBrush; CBitmap *pBmpOld; CFont *pOldFont, fntSample; LOGFONT lfSampleFont; int nFontHeightPixels, iBackModeOld; COLORREF crTextColourOld; CString strSample; ASSERT( pDC != NULL ); ASSERT( m_plfCurrentFont != NULL ); if( pDC != NULL && m_plfCurrentFont != NULL ) { strSample.LoadString( IDS_STR_SAMPLE ); dcMem.CreateCompatibleDC( NULL ); // Select our gdi stuff into dc pBmpOld = (CBitmap*)dcMem.SelectObject( &m_bmpSample ); pOldPen = (CPen*)dcMem.SelectStockObject( BLACK_PEN ); pOldBrush = (CBrush*)dcMem.SelectStockObject( WHITE_BRUSH ); // Create the font fntSample.CreateFontIndirect( m_plfCurrentFont ); // Get it back out so that we can adjust the font size correctly fntSample.GetLogFont( &lfSampleFont ); // Font height in pixels nFontHeightPixels = theApp.GetFontHeightPixels(lfSampleFont.lfHeight, &dcMem); // Update font lfSampleFont.lfHeight = nFontHeightPixels; fntSample.DeleteObject(); fntSample.CreateFontIndirect( &lfSampleFont ); // Erase display (will draw white rectangle with black border) dcMem.Rectangle( m_rctSampleMem ); // Select our font and colour values and modes pOldFont = (CFont*)dcMem.SelectObject( &fntSample ); crTextColourOld = dcMem.SetTextColor( m_crCurrentFontColour ); iBackModeOld = dcMem.SetBkMode( TRANSPARENT ); // Display the text dcMem.DrawText( strSample, m_rctSampleText, DT_SINGLELINE|DT_VCENTER|DT_CENTER ); // Blast main memory dc to display pDC->BitBlt( m_rctSample.left, m_rctSample.top, m_rctSample.Width(), m_rctSample.Height(), &dcMem, 0, 0, SRCCOPY ); // Restore old font and colour values and modes dcMem.SelectObject( pOldFont ); dcMem.SetTextColor( crTextColourOld ); dcMem.SetBkMode( iBackModeOld ); dcMem.SelectObject( pBmpOld ); dcMem.SelectObject( pOldPen ); dcMem.SelectObject( pOldBrush ); // Release memory dcMem.DeleteDC(); fntSample.DeleteObject(); // brushes and pens don't need deleting as they are stock objects } }，用户还可以在其中设置字体颜色：

正如您所看到的，在此对话框中，它使用字体样本的透明背景，以便显示白色文本。但公平地说，由于我正在使用皮肤，它会出现更多。

在我的窗口我使用的是白色背景。所以你看到了我的问题。就是这样。您无法看到它。：）

没有变得复杂，并且考虑到我是色盲（红色/绿色）的事实，我们可以使用一种简单的技术来始终确保 my 样本中的样本背景总是适合给定正在呈现的字体的颜色？

谢谢。

Answer 1

根据指示我另一个问题的评论，我能够解决这个问题：

void CExportSettingsDlg::DrawSampleText(CDC *pDC)
{
    CDC         dcMem;
    CPen        *pOldPen;
    CBrush      *pOldBrush;
    CBitmap     *pBmpOld;
    CFont       *pOldFont, fntSample;
    LOGFONT     lfSampleFont;
    int         nFontHeightPixels, iBackModeOld;
    COLORREF    crTextColourOld;
    CString     strSample;

    ASSERT( pDC != NULL );
    ASSERT( m_plfCurrentFont != NULL );
    if( pDC != NULL && m_plfCurrentFont != NULL )
    {
        strSample.LoadString( IDS_STR_SAMPLE );

        dcMem.CreateCompatibleDC( NULL );

        // Select our gdi stuff into dc
        pBmpOld = (CBitmap*)dcMem.SelectObject( &m_bmpSample );
        pOldPen = (CPen*)dcMem.SelectStockObject( BLACK_PEN );
        //pOldBrush = (CBrush*)dcMem.SelectStockObject( WHITE_BRUSH );
        CBrush brBackground;
        double dLumi = (0.2126 * GetRValue(m_crCurrentFontColour))
            + (0.7152*GetGValue(m_crCurrentFontColour)) + (0.0722*GetBValue(m_crCurrentFontColour));
        if (dLumi <= 0.5)
            brBackground.CreateSolidBrush(PALETTERGB(255, 255, 255));
        else
            brBackground.CreateSolidBrush(PALETTERGB(0, 0, 0));
        pOldBrush = (CBrush*)dcMem.SelectObject(&brBackground);

        // Create the font
        fntSample.CreateFontIndirect( m_plfCurrentFont );

        // Get it back out so that we can adjust the font size correctly
        fntSample.GetLogFont( &lfSampleFont );

        // Font height in pixels
        nFontHeightPixels = theApp.GetFontHeightPixels(lfSampleFont.lfHeight, &dcMem);

        // Update font
        lfSampleFont.lfHeight = nFontHeightPixels;
        fntSample.DeleteObject();
        fntSample.CreateFontIndirect( &lfSampleFont );

        // Erase display  (will draw  a white rectangle with black border)
        dcMem.Rectangle( m_rctSampleMem );

        // Select our font and colour values and modes
        pOldFont = (CFont*)dcMem.SelectObject( &fntSample );
        crTextColourOld = dcMem.SetTextColor( m_crCurrentFontColour );
        iBackModeOld = dcMem.SetBkMode( TRANSPARENT );

        // Display the text
        dcMem.DrawText( strSample, m_rctSampleText, DT_SINGLELINE|DT_VCENTER|DT_CENTER );

        // Blast main memory dc to display
        pDC->BitBlt( m_rctSample.left, m_rctSample.top,
            m_rctSample.Width(), m_rctSample.Height(),
            &dcMem, 0, 0, SRCCOPY );

        // Restore old font and colour values and modes
        dcMem.SelectObject( pOldFont );
        dcMem.SetTextColor( crTextColourOld );
        dcMem.SetBkMode( iBackModeOld );
        dcMem.SelectObject( pBmpOld );
        dcMem.SelectObject( pOldPen );
        dcMem.SelectObject( pOldBrush );

        // Release memory
        dcMem.DeleteDC();
        fntSample.DeleteObject();
        // brushes and pens don't need deleting as they are stock objects
        brBackground.DeleteObject();
    }
}

更改字体背景以便可以看到文本

1 个答案: