truetype字体的字形和指标| .NET

获取字体指标

字体指标包含诸如ascender，‘descender，typoAscender，typodescender`和’unitsperem’之类的信息。 适用于 .NET 的 Aspose.Font API可以使用以下示例代码从TRUETYPE字体文件中读取字体指标信息。

// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path

FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
TtfFont font = Aspose.Font.Font.Open(fd) as TtfFont;

string name = font.FontName;
Console.WriteLine("Font name: " + name);
Console.WriteLine("Glyph count: " + font.NumGlyphs);
string metrics = string.Format(
    "Font metrics: ascender - {0}, descender - {1}, typo ascender = {2}, typo descender = {3}, UnitsPerEm = {4}",
    font.Metrics.Ascender, font.Metrics.Descender,
    font.Metrics.TypoAscender, font.Metrics.TypoDescender, font.Metrics.UnitsPerEM);

Console.WriteLine(metrics);

//Get cmap unicode encoding table from font as object TtfCMapFormatBaseTable to access information about font glyph for symbol 'A'.
//Also check that font has object TtfGlyfTable (table 'glyf') to access glyph.
Aspose.Font.TtfCMapFormats.TtfCMapFormatBaseTable cmapTable = null;
if (font.TtfTables.CMapTable != null)
{
    cmapTable = font.TtfTables.CMapTable.FindUnicodeTable();
}
if (cmapTable != null && font.TtfTables.GlyfTable != null)
{
    Console.WriteLine("Font cmap unicode table: PlatformID = " + cmapTable.PlatformId + ", PlatformSpecificID = " + cmapTable.PlatformSpecificId);

    //Code for 'A' symbol
    char unicode = (char)65;

    //Glyph index for 'A'
    uint glIndex = cmapTable.GetGlyphIndex(unicode);

    if (glIndex != 0)
    {
        //Glyph for 'A'
        Glyph glyph = font.GetGlyphById(glIndex);
        if (glyph != null)
        {
            //Print glyph metrics
            Console.WriteLine("Glyph metrics for 'A' symbol:");
            string bbox = string.Format(
                "Glyph BBox: Xmin = {0}, Xmax = {1}" + ", Ymin = {2}, Ymax = {3}",
                glyph.GlyphBBox.XMin, glyph.GlyphBBox.XMax,
                glyph.GlyphBBox.YMin, glyph.GlyphBBox.YMax);
            Console.WriteLine(bbox);
            Console.WriteLine("Width:" + font.Metrics.GetGlyphWidth(new GlyphUInt32Id(glIndex)));
        }
    }
}

检测拉丁符号

适用于 .NET 的 Aspose.Font可让您从truetype字体文件中检测拉丁符号。这可以使用以下示例代码来实现。

• 使用fontfiledefinition加载字体文件
• 使用DecodeTogid()方法解码滑翔机

// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path

FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
TtfFont ttfFont = Aspose.Font.Font.Open(fd) as TtfFont;

bool latinText = true;


for (uint code = 65; code < 123; code++)
{
    GlyphId gid = ttfFont.Encoding.DecodeToGid(code);
    if (gid == null || gid == GlyphUInt32Id.NotDefId)
    {
        latinText = false;
    }
}

if (latinText)
{
    Console.WriteLine(string.Format("Font {0} supports latin symbols.", ttfFont.FontName));
}
else
{
    Console.WriteLine(string.Format("Latin symbols are not supported by font {0}.", ttfFont.FontName));
}

提取许可限制

使用适用于 .NET 的 Aspose.Font api从字体文件中提取许可限制。字体可以在以下模式之一中具有嵌入其中的许可信息。

• ``可编辑嵌入’-字体可能被嵌入，并且可以暂时加载到其他系统上。此外，允许编辑，包括使用嵌入式字体格式化新文本的能力，并且可以保存更改。
• 可嵌入的“可安装嵌入” - 可以嵌入字体，并且可以永久安装在远程系统上，也可以被其他用户使用。
• “预览和打印嵌入” - 字体可以嵌入，并且可以暂时加载到其他系统上，以查看或打印文档。
• 不得以任何方式修改，嵌入或交换“限制嵌入” - 未经首先获得法律所有者的明确许可。

以下代码示例显示了如何以方便的形式使用对象aspose.font.ttf.licenseflags以获取有关字体许可限制(来自表OS/2的FLAG FSTYPE)的信息。

// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-.NET
string dataDir = RunExamples.GetDataDir_Data();
//Font to check
string fileName = dataDir + "Montserrat-Regular.ttf"; //Font file name with full path

FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
TtfFont font = Aspose.Font.Font.Open(fd) as TtfFont;
LicenseFlags licenseFlags = null;
if (font.TtfTables.Os2Table != null)
{
    licenseFlags = font.TtfTables.Os2Table.GetLicenseFlags();
}

if (licenseFlags == null || licenseFlags.FSTypeAbsent)
{
    Console.WriteLine(string.Format("Font {0} has no embedded license restrictions", font.FontName));
}
else
{
    if (licenseFlags.IsEditableEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} may be embedded, and may be temporarily loaded on other systems.", font.FontName)
            + " In addition, editing is permitted, including ability to format new text"
            + " using the embedded font, and changes may be saved.");
    }
    else if (licenseFlags.IsInstallableEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} may be embedded, and may be permanently installed", font.FontName)
            + " for use on a remote systems, or for use by other users.");
    }
    else if (licenseFlags.IsPreviewAndPrintEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} may be embedded, and may be temporarily loaded", font.FontName)
            + "  on other systems for purposes of viewing or printing the document.");
    }
    else if (licenseFlags.IsRestrictedLicenseEmbedding)
    {
        Console.WriteLine(
            string.Format("Font {0} must not be modified, embedded or exchanged in any manner", font.FontName)
            + " without first obtaining explicit permission of the legal owner.");
    }
}