Glyphen und Metriken von TrueType-Schriftarten | Java

Rufen Sie Schriftmetriken ab

Schriftmetriken beziehen sich auf Informationen wie „Ascender“, „Descender“, „TypoAscender“, „TypoDescender“ und „UnitsPerEm“. Mit der Aspose.Font for Java-API können TTF-Schriftartendateien geöffnet und mithilfe des folgenden Beispielcodes die Schriftmetrikinformationen aus diesen gelesen werden.

 1// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-Java
 2String fileName = Utils.getDataDir() + "Montserrat-Regular.ttf"; //Font file name with full path
 3
 4      FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
 5      TtfFont font = (TtfFont) Font.open(fd);
 6
 7      String name = font.getFontName();
 8      System.out.println("Font name: " + name);
 9      System.out.println("Glyph count: " + font.getNumGlyphs());
10      String metrics = MessageFormat.format(
11          "Font metrics: ascender - {0}, descender - {1}, typo ascender = {2}, typo descender = {3}, UnitsPerEm = {4}",
12          font.getMetrics().getAscender(), font.getMetrics().getDescender(),
13          font.getMetrics().getTypoAscender(), font.getMetrics().getTypoDescender(), font.getMetrics().getUnitsPerEM());
14
15      System.out.println(metrics);
16      
17    //Get cmap unicode encoding table from font as object TtfCMapFormatBaseTable to access information about font glyph for symbol 'A'.
18      //Also check that font has object TtfGlyfTable (table 'glyf') to access glyph.
19      TtfCMapFormatBaseTable cmapTable = null;
20      if (font.getTtfTables().getCMapTable() != null)
21      {
22          cmapTable = font.getTtfTables().getCMapTable().findUnicodeTable();
23      }
24      if (cmapTable != null && font.getTtfTables().getGlyfTable() != null)
25      {
26      	System.out.println("Font cmap unicode table: PlatformID = " + cmapTable.getPlatformId() +
27      			", PlatformSpecificID = " + cmapTable.getPlatformSpecificId());
28
29          //Code for 'A' symbol
30          char unicode = (char)65;
31
32          //Glyph index for 'A'
33          long glIndex = cmapTable.getGlyphIndex(unicode);
34
35          if (glIndex != 0)
36          {
37              //Glyph for 'A'
38              Glyph glyph = font.getGlyphById(glIndex);
39              if (glyph != null)
40              {
41                  //Print glyph metrics
42              	System.out.println("Glyph metrics for 'A' symbol:");
43                  String bbox = MessageFormat.format(
44                      "Glyph BBox: Xmin = {0}, Xmax = {1}" + ", Ymin = {2}, Ymax = {3}",
45                      glyph.getGlyphBBox().getXMin(), glyph.getGlyphBBox().getXMax(),
46                      glyph.getGlyphBBox().getYMin(), glyph.getGlyphBBox().getYMax());
47                  System.out.println(bbox);
48                  System.out.println("Width:" + font.getMetrics().getGlyphWidth(new GlyphUInt32Id(glIndex)));
49              }
50          }
51      }

Erkennen Sie lateinische Symbole

Mit Aspose.Font für .API können Sie lateinische Symbole aus TrueType-Schriftdateien erkennen. Dies kann mit dem folgenden Beispielcode erreicht werden.

 1// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-Java
 2String fileName = Utils.getDataDir() + "Montserrat-Regular.ttf"; //Font file name with full path
 3
 4      FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
 5      TtfFont ttfFont = (TtfFont) Font.open(fd);
 6
 7      boolean latinText = true;
 8
 9
10      for (int code = 65; code < 123; code++)
11      {
12          GlyphId gid = ttfFont.getEncoding().decodeToGid(code);
13          if (gid == null || gid == GlyphUInt32Id.getNotDef())
14          {
15              latinText = false;
16          }
17      }
18
19      if (latinText)
20      {
21          System.out.println(MessageFormat.format("Font {0} supports latin symbols.", ttfFont.getFontName()));
22      }
23      else
24      {
25      	System.out.println(MessageFormat.format("Latin symbols are not supported by font {0}.", ttfFont.getFontName()));
26      }

Lizenzbeschränkungen extrahieren

Verwenden Sie die Aspose.Font for Java-API, um Lizenzbeschränkungen aus Schriftartdateien zu extrahieren. In Schriftarten können Lizenzinformationen in einem der folgenden Modi eingebettet sein.

Das folgende Codebeispiel zeigt, wie Sie ein Objekt Aspose.Font.Ttf.LicenseFlags verwenden, um Informationen zu Schriftartlizenzeinschränkungen (Flag fsType aus Tabelle OS/2) in praktischer Form abzurufen.

 1// For complete examples and data files, please go to https://github.com/aspose-font/Aspose.Font-for-Java
 2String fileName = Utils.getDataDir() + "Montserrat-Regular.ttf"; //Font file name with full path
 3
 4      FontDefinition fd = new FontDefinition(FontType.TTF, new FontFileDefinition("ttf", new FileSystemStreamSource(fileName)));
 5      TtfFont font = (TtfFont) Font.open(fd);
 6
 7      LicenseFlags licenseFlags = null;
 8      if (font.getTtfTables().getOs2Table() != null)
 9      {
10          licenseFlags = font.getTtfTables().getOs2Table().getLicenseFlags();
11      }
12
13      if (licenseFlags == null || licenseFlags.isFSTypeAbsent())
14      {
15          System.out.println(MessageFormat.format("Font {0} has no embedded license restrictions", font.getFontName()));
16      }
17      else
18      {
19          if (licenseFlags.isEditableEmbedding())
20          {
21          	System.out.println(MessageFormat.format("Font {0} may be embedded, and may be temporarily loaded on other systems.", font.getFontName())
22                  + " In addition, editing is permitted, including ability to format new text"
23                  + " using the embedded font, and changes may be saved.");
24          }
25          else if (licenseFlags.isInstallableEmbedding())
26          {
27          	System.out.println(MessageFormat.format("Font {0} may be embedded, and may be permanently installed", font.getFontName())
28                  + " for use on a remote systems, or for use by other users.");
29          }
30          else if (licenseFlags.isPreviewAndPrintEmbedding())
31          {
32          	System.out.println(MessageFormat.format("Font {0} may be embedded, and may be temporarily loaded", font.getFontName())
33                  + "  on other systems for purposes of viewing or printing the document.");
34          }
35          else if (licenseFlags.isRestrictedLicenseEmbedding())
36          {
37          	System.out.println(MessageFormat.format("Font {0} must not be modified, embedded or exchanged in any manner", font.getFontName())
38                  + " without first obtaining explicit permission of the legal owner.");
39          }
40      }
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