ActiveState!

ActivePerl Documentation
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 Font::AFM - Interface to Adobe Font Metrics files


NAME

Font::AFM - Interface to Adobe Font Metrics files


SUPPORTED PLATFORMS

  • Linux
  • Solaris
  • Windows

SYNOPSIS

 use Font::AFM;
 $h = new Font::AFM "Helvetica";
 $copyright = $h->Notice;
 $w = $h->Wx->{"aring"};
 $w = $h->stringwidth("Gisle", 10);
 $h->dump;  # for debugging


DESCRIPTION

This module implements the Font::AFM class. Objects of this class are initialised from an AFM-file and allows you to obtain information about the font and the metrics of the various glyphs in the font.

All measurements in AFM files are given in terms of units equal to 1/1000 of the scale factor of the font being used. To compute actual sizes in a document, these amounts should be multiplied by (scale factor of font)/1000.

The following methods are available:

$afm = Font::AFM->new($fontname)
Object constructor. Takes the name of the font as argument. It will croak if the font can not be found.

$afm->latin1_wx_table()
Returns a 256 element array, where each element contains the width of the corresponding character in the iso-8859-1 character set.

$afm->stringwidth($string, [$fontsize])
Returns the width of the string passed as argument. The string is assumed to be encoded in the iso-8859-1 character set. A second argument can be used to scale the width according to the font size.

$afm->FontName
The name of the font as presented to the PostScript language findfont operator, for instance ``Times-Roman''.

$afm->FullName
Unique, human-readable name for an individual font, for instance ``Times Roman''.

$afm->FamilyName
Human-readable name for a group of fonts that are stylistic variants of a single design. All fonts that are member of such a group should have exactly the same FamilyName. Example of a family name is ``Times''.

$afm->Weight
Human-readable name for the weight, or ``boldness'', attribute of a font. Exampes are Roman, Bold, Light.

$afm->ItalicAngle
Angle in degrees counterclockwise from the vertical of the dominant vertical strokes of the font.

$afm->IsFixedPitch
If the value is true, it indicated that the font is a fixed-pitch (monospaced) font.

$afm->FontBBox
A string of four numbers giving the lower-left x, lower-left y, upper-right x, and upper-right y of the font bounding box. The font bounding box is the smallest rectangle enclosing the shape that would result if all the characters of the font were placed with their origins coincident, and then painted.

$afm->UnderlinePosition
Recommended distance from the baseline for positioning underline stokes. This number is the y coordinate of the center of the stroke.

$afm->UnderlineThickness
Recommended stroke width for underlining.

$afm->Version
Version number of the font.

$afm->Notice
Trademark or copyright notice, if applicable.

$afm->Comment
Comments found in the AFM file.

$afm->EncodingScheme
The name of the standard encoding scheme for the font. Most Adobe fonts use the AdobeStandardEncoding. Special fonts might state FontSpecific.

$afm->CapHeight
Usually the y-value of the top of the capital H.

$afm->XHeight
Typically the y-value of the top of the lowercase x.

$afm->Ascender
Typically the y-value of the top of the lowercase d.

$afm->Descender
Typically the y-value of the bottom of the lowercase p.

$afm->Wx
Returns a hash table that maps from glyph names to the width of that glyph.

$afm->BBox
Returns a hash table that maps from glyph names to bounding box information. The bounding box consist of 4 numbers: llx, lly, urx, ury.

$afm->dump
Dumps the content of the Font::AFM object to STDOUT. Might sometimes be useful for debugging.

The AFM specification can be found at:

   ftp://ftp.adobe.com/pub/adobe/DeveloperSupport/TechNotes/PSfiles/5004.AFM_Spec.ps


ENVIRONMENT

METRICS
Contains the path to seach for AFM-files. Format is as for the PATH environment variable. The default path built into this library is:
 /usr/lib/afm:/usr/local/lib/afm:/usr/openwin/lib/fonts/afm/:.


BUGS

Kerning data and composite character data is not yet parsed. Ligature data is not parsed.


COPYRIGHT

Copyright 1995-1998 Gisle Aas. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

 Font::AFM - Interface to Adobe Font Metrics files