Type1フォントを使用したテキストレンダリング| C ++

レンダリングテキスト

テキストをレンダリングするために、レンダリングサブシステムでは、Glyphを描くためにAspose.font.rendering.iglyphoutlinePainterインターフェイスの実装が必要です。これは、次の手順を使用して実現できます。

  1. グラフィック描画目標のために、タイプSystem.drawing.drawing.draphicspathのオブジェクトを必要とするクラスGlyphoutlinePainterを作成して、iglyphoutlinePainterメソッドを実装します。実装は以下に示すように説明します。
 1For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-C
 2RenderingText::GlyphOutlinePainter::GlyphOutlinePainter(System::SharedPtr<System::Drawing::Drawing2D::GraphicsPath> path)
 3{
 4    _path = path;
 5}
 6
 7void RenderingText::GlyphOutlinePainter::MoveTo(System::SharedPtr<Aspose::Font::RenderingPath::MoveTo> moveTo)
 8{
 9    _path->CloseFigure();
10    _currentPoint.set_X((float)moveTo->get_X());
11    _currentPoint.set_Y((float)moveTo->get_Y());
12}
13
14void RenderingText::GlyphOutlinePainter::LineTo(System::SharedPtr<Aspose::Font::RenderingPath::LineTo> lineTo)
15{
16    float x = (float)lineTo->get_X();
17    float y = (float)lineTo->get_Y();
18    _path->AddLine(_currentPoint.get_X(), _currentPoint.get_Y(), x, y);
19    _currentPoint.set_X(x);
20    _currentPoint.set_Y(y);
21}
22
23void RenderingText::GlyphOutlinePainter::CurveTo(System::SharedPtr<Aspose::Font::RenderingPath::CurveTo> curveTo)
24{
25    float x3 = (float)curveTo->get_X3();
26    float y3 = (float)curveTo->get_Y3();
27    
28    _path->AddBezier(_currentPoint.get_X(), _currentPoint.get_Y(), (float)curveTo->get_X1(), (float)curveTo->get_Y1(), (float)curveTo->get_X2(), (float)curveTo->get_Y2(), x3, y3);
29    
30    _currentPoint.set_X(x3);
31    _currentPoint.set_Y(y3);
32}
33
34void RenderingText::GlyphOutlinePainter::ClosePath()
35{
36    _path->CloseFigure();
37}
38
39System::Object::shared_members_type Aspose::Font::Examples::WorkingWithType1Fonts::RenderingText::GlyphOutlinePainter::GetSharedMembers()
40{
41    auto result = System::Object::GetSharedMembers();
42    
43    result.Add("Aspose::Font::Examples::WorkingWithType1Fonts::RenderingText::GlyphOutlinePainter::_path", this->_path);
44    result.Add("Aspose::Font::Examples::WorkingWithType1Fonts::RenderingText::GlyphOutlinePainter::_currentPoint", this->_currentPoint);
45    
46    return result;
47}
  1. 指定されたテキストをsystem.drawing.bitmapオブジェクトに描画し、ディスクに結果のビットマップを保存します。これには、次の手順が含まれます。

「この戦略のための補助ステップ」

drawTextメソッドの実装は、以下に示すように。

 1For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-C
 2void RenderingText::DrawText(System::String text, System::SharedPtr<IFont> font, double fontSize, System::SharedPtr<System::Drawing::Brush> backgroundBrush, System::SharedPtr<System::Drawing::Brush> textBrush, System::String outFile)
 3{
 4    //Get glyph identifiers for every symbol in text line
 5    System::ArrayPtr<System::SharedPtr<GlyphId>> gids = System::MakeArray<System::SharedPtr<Aspose::Font::Glyphs::GlyphId>>(text.get_Length());
 6    for (int32_t i = 0; i < text.get_Length(); i++)
 7    {
 8        gids[i] = font->get_Encoding()->DecodeToGid(text[i]);
 9    }
10    // set common drawing settings
11    double dpi = 300;
12    
13    double resolutionCorrection = dpi / 72;
14    // 72 is font's internal dpi
15    // prepare output bitmap
16    System::SharedPtr<System::Drawing::Bitmap> outBitmap = System::MakeObject<System::Drawing::Bitmap>(960, 720);
17    outBitmap->SetResolution((float)dpi, (float)dpi);
18    System::SharedPtr<System::Drawing::Graphics> outGraphics = System::Drawing::Graphics::FromImage(outBitmap);
19    outGraphics->FillRectangle(backgroundBrush, 0, 0, outBitmap->get_Width(), outBitmap->get_Height());
20    outGraphics->set_SmoothingMode(System::Drawing::Drawing2D::SmoothingMode::HighQuality);
21    //declare coordinate variables and previous gid
22    System::SharedPtr<GlyphId> previousGid;
23    double glyphXCoordinate = 0;
24    double glyphYCoordinate = fontSize * resolutionCorrection;
25    //loop which paints every glyph in gids
26    
27    {
28        for (System::SharedPtr<GlyphId> gid : gids)
29        {
30            // if the font contains the gid
31            if (gid != nullptr)
32            {
33                System::SharedPtr<Glyph> glyph = font->get_GlyphAccessor()->GetGlyphById(gid);
34                if (glyph == nullptr)
35                {
36                    continue;
37                }
38                
39                // path that accepts drawing instructions
40                System::SharedPtr<System::Drawing::Drawing2D::GraphicsPath> path = System::MakeObject<System::Drawing::Drawing2D::GraphicsPath>();
41                
42                // Create IGlyphOutlinePainter implementation
43                System::SharedPtr<RenderingText::GlyphOutlinePainter> outlinePainter = System::MakeObject<RenderingText::GlyphOutlinePainter>(path);
44                
45                // Create the renderer
46                System::SharedPtr<Aspose::Font::Renderers::IGlyphRenderer> renderer = System::MakeObject<Aspose::Font::Renderers::GlyphOutlineRenderer>(outlinePainter);
47                
48                // get common glyph properties
49                double kerning = 0;
50                
51                // get kerning value
52                if (previousGid != nullptr)
53                {
54                    kerning = (font->get_Metrics()->GetKerningValue(previousGid, gid) / glyph->get_SourceResolution()) * fontSize * resolutionCorrection;
55                    kerning += FontWidthToImageWith(font->get_Metrics()->GetGlyphWidth(previousGid), glyph->get_SourceResolution(), fontSize);
56                }
57                
58                // glyph positioning - increase glyph X coordinate according to kerning distance
59                glyphXCoordinate += kerning;
60                
61                // Glyph placement matrix
62                System::SharedPtr<TransformationMatrix> glyphMatrix = System::MakeObject<TransformationMatrix>(System::MakeArray<double>({fontSize * resolutionCorrection, 0, 0, -fontSize * resolutionCorrection, glyphXCoordinate, glyphYCoordinate}));
63                
64                // render current glyph
65                renderer->RenderGlyph(font, gid, glyphMatrix);
66                // fill the path
67                path->set_FillMode(System::Drawing::Drawing2D::FillMode::Winding);
68                outGraphics->FillPath(textBrush, path);
69            }
70            //set current gid as previous to get correct kerning for next glyph
71            previousGid = gid;
72        }
73        
74    }
75    //Save results
76    outBitmap->Save(outFile);
77}
  1. 以下のコードサンプルに示すように、イメージ幅にフォント幅を計算するユーティリティメソッドを作成します。
1For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-C
2double RenderingText::FontWidthToImageWith(double width, int32_t fontSourceResulution, double fontSize, double dpi /* = 300*/)
3{
4    double resolutionCorrection = dpi / 72;
5    // 72 is font's internal dpi
6    return (width / fontSourceResulution) * fontSize * resolutionCorrection;
7}

レンダリングテキスト機能を呼び出します

上記の実装を使用するには、コンソールベースのアプリケーションの主な方法から次のサンプルコードを実行できます。

 1For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-C
 2System::String fileName = dataDir + u"courier.pfb";
 3//Font file name with full path
 4    
 5System::SharedPtr<FontDefinition> fd = System::MakeObject<FontDefinition>(Aspose::Font::FontType::Type1, System::MakeObject<FontFileDefinition>(u"pfb", System::MakeObject<FileSystemStreamSource>(fileName)));
 6System::SharedPtr<Type1Font> font = System::DynamicCast_noexcept<Aspose::Font::Type1::Type1Font>(Aspose::Font::Font::Open(fd));
 7    
 8    
 9DrawText(u"Hello world", font, 14, System::Drawing::Brushes::get_White(), System::Drawing::Brushes::get_Black(), dataDir + u"hello1_type1_out.jpg");
10DrawText(u"Hello world", font, 14, System::Drawing::Brushes::get_Yellow(), System::Drawing::Brushes::get_Red(), dataDir + u"hello2_type1_out.jpg");

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