小编use*_*994的帖子

我正在使用GDI +绘制文本.我最近注意到,当DPI更改时,此文本会自动缩放.有没有办法使GDI +文本绘图独立于DPI？例如,我想绘制最多20像素的文本,无论DPI如何.可能吗？这该怎么做？

下面是一个示例代码.我想绘制具有常量大小的第一个文本,无论DPI如何,第二个文本通常:

    case WM_PAINT:
    {
        inherited::WndProc(message);

        Canvas->Brush->Style = bsSolid;
        Canvas->Brush->Color = clWhite;
        Canvas->FillRect(ClientRect);

        // get GDI+ graphics from canvas
        Gdiplus::Graphics graphics(Canvas->Handle);

        // set text rendering hint
        graphics.SetTextRenderingHint(Gdiplus::TextRenderingHintSystemDefault);

        std::auto_ptr<Gdiplus::Font>         pFont(new Gdiplus::Font(Canvas->Handle, Font->Handle));
        std::auto_ptr<Gdiplus::SolidBrush>   pBrush(new Gdiplus::SolidBrush(Gdiplus::Color(255, 0, 0, 0)));
        std::auto_ptr<Gdiplus::StringFormat> pFormat(new Gdiplus::StringFormat());

        Gdiplus::FontFamily fontFamily;
        pFont->GetFamily(&fontFamily);

        std::auto_ptr<Gdiplus::Font> pFont2(new Gdiplus::Font(&fontFamily, pFont->GetSize(),
                pFont->GetStyle(), Gdiplus::UnitPixel));
        Gdiplus::Unit test = pFont->GetUnit();
        Gdiplus::Unit test2 = pFont2->GetUnit();

        pFormat->SetAlignment(Gdiplus::StringAlignmentNear);
        pFormat->SetLineAlignment(Gdiplus::StringAlignmentNear);

        Gdiplus::StringFormatFlags flags = Gdiplus::StringFormatFlagsBypassGDI;
        //flags = (Gdiplus::StringFormatFlags)(flags | Gdiplus::StringFormatFlagsDirectionRightToLeft);
        //flags = (Gdiplus::StringFormatFlags)(flags | Gdiplus::StringFormatFlagsDirectionVertical);
        //flags = (Gdiplus::StringFormatFlags)(flags | Gdiplus::StringFormatFlagsNoWrap); …