3.1.3.9. Tfm¶

This module handles TeX Font Metric.

The class PyDvi.Tfm handles the font’s metric. To get a PyDvi.Tfm instance for a particular font use the static method PyDvi.TfmParser.TfmParser.parse(). For example use this code for the font “cmr10”:

tfm = TfmParser.parse('cmr10', '/usr/share/texmf/fonts/tfm/public/cm/cmr10.tfm')

The number of characters in the font can be obtained using the function len():

>>> len(tfm)
128

Each character’s metric is stored in a TfmChar instance that can be accessed using the char code as index on the Tfm class instance. For example to get the metric of the character “A” use:

tfm[ord('A')]

class PyDvi.Font.Tfm.Tfm(font_name, filename, smallest_character_code, largest_character_code, checksum, design_font_size, character_coding_scheme, family)[source]¶

Bases: object

This class encapsulates a TeX Font Metric for a font.

Public attributes:

font_name

font’s name

filename

”.tfm” filename

smallest_character_code

smallest character code of the font

largest_character_code

largest character code of the font

checksum

checksum of the tfm file

design_font_size

design font size

character_coding_scheme

character coding scheme

family

font’s family

slant

spacing

space_stretch

space_shrink

x_height

quad

extra_space

In addition for Math font, the following public attributes are available:

um1

num2

num3

denom1

denom2

sup1

sup2

sup3

sub1

sub2

supdrop

subdrop

delim1

delim2

axis_height

default_rule_thickness

big_op_spacing

The number of characters can be queried using len(). The TfmChar instance for a character code char_code can be set or get using the operator [].

add_lig_kern(obj)[source]¶

Add a ligature/kern program obj.

get_lig_kern_program(i)[source]¶

Return the ligature/kern program at index i.

print_summary()[source]¶

set_font_parameters(parameters)[source]¶

Set the font parameters.

set_math_extension_parameters(parameters)[source]¶

Set the math extension parameters.

set_math_symbols_parameters(parameters)[source]¶

Set the math symbols parameters.

class PyDvi.Font.Tfm.TfmChar(tfm, char_code, width, height, depth, italic_correction, lig_kern_program_index=None, next_larger_char=None)[source]¶

Bases: object

This class encapsulates a TeX Font Metric for a Glyph.

Public attributes:

char_code

width

height

depth

italic_correction

chr()[source]¶

Return the character string from its char code if it is printable.

get_lig_kern_program()[source]¶

Get the ligature/kern program of the character.

next_larger_tfm_char()[source]¶

Return the TfmChar instance for the next larger char if it exists else return None.

print_summary()[source]¶

printable = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'¶

List of the printable characters.

scaled_depth(scale_factor)[source]¶

Return the scaled depth by scale_factor.

scaled_dimensions(scale_factor)[source]¶

Return the 3-tuple made of the scaled width, height and depth by scale_factor.

scaled_height(scale_factor)[source]¶

Return the scaled height by scale_factor.

scaled_width(scale_factor)[source]¶

Return the scaled width by scale_factor.

class PyDvi.Font.Tfm.TfmExtensibleChar(tfm, char_code, width, height, depth, italic_correction, extensible_recipe, lig_kern_program_index=None, next_larger_char=None)[source]¶

Bases: PyDvi.Font.Tfm.TfmChar

This class encapsulates a TeX Font Metric for an extensible Glyph.

Public attributes:

top

mid

bot

rep

class PyDvi.Font.Tfm.TfmKern(tfm, index, stop, next_char, kern)[source]¶

Bases: PyDvi.Font.Tfm.TfmLigKern

This class represents a Kerning Program Instruction.

Public Attributes:

next_char

next character

kern

kerning value

class PyDvi.Font.Tfm.TfmLigature(tfm, index, stop, next_char, ligature_char_code, number_of_chars_to_pass_over, current_char_is_deleted, next_char_is_deleted)[source]¶

Bases: PyDvi.Font.Tfm.TfmLigKern

This class represents a Ligature Program Instruction.

Public Attributes:

next_char

next character

ligature_char_code

ligature character code

current_char_is_deleted

the current characters must be deleted of the stream

next_char_is_deleted

the next characters must be deleted of the stream

number_of_chars_to_pass_over

number of characters to pass over