Glyphes et mesures des polices TrueType | Java

Obtenir les métriques de police

Les métriques de police font référence à des informations telles que « Ascender », « Descender », « TypoAscender », « TypoDescender » et « UnitsPerEm ». L’API Aspose.Font for Java peut être utilisée pour ouvrir les fichiers de polices TTF et lire les informations Font Metrics à partir de ceux-ci à l’aide de l’exemple de code suivant.

 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      }

Détecter les symboles latins

Aspose.Font pour .API vous permet de détecter les symboles latins à partir des fichiers de polices TrueType. Ceci peut être réalisé en utilisant l’exemple de code suivant .

 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      }

Extraire les restrictions de licence

Utilisez l’API Aspose.Font for Java pour extraire les restrictions de licence des fichiers de polices. Les polices peuvent contenir des informations de licence intégrées dans l’un des modes suivants .

L’exemple de code suivant montre comment utiliser un objet Aspose.Font.Ttf.LicenseFlags pour obtenir des informations sur les restrictions de licence de police (drapeau fsType de la table OS/2) sous une forme pratique.

 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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