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5.5 GFtoDVI: Character proofs of fonts

GFtoDVI makes "proof sheets" from a GF bitmap file as output by, for
example, Metafont (*note Metafont::).  This is an indispensable aid for
font designers or Metafont hackers.  Synopsis:

     gftodvi [OPTION]... GFNAME[gf]

   The font GFNAME is searched for in the usual places (*note
(kpathsea)Glyph lookup::).  To see all the relevant paths, set the
environment variable 'KPATHSEA_DEBUG' to '-1' before running the

   The suffix 'gf' is supplied if not already present.  This suffix is
not an extension, no '.' precedes it; for instance, 'cmr10.600gf'.

   The output filename is the basename of GFNAME extended with '.dvi',
e.g., 'gftodvi /wherever/foo.600gf' creates './foo.dvi'.

   The characters from GFNAME appear one per page in the DVI output,
with labels, titles, and annotations, as specified in Appendix H
(Hardcopy Proofs) of 'The Metafontbook'.

   GFtoDVI uses several fonts besides GFNAME itself:

   * "gray font" (default 'gray'): for the pixels that actually make up
     the character.  Simply using black is not right, since then labels,
     key points, and other information could not be shown.

   * "title font" (default 'cmr8'): for the header information at the
     top of each output page.

   * "label font" (default 'cmtt10'): for the labels on key points of
     the figure.

   * "slant font" (no default): for diagonal lines, which are otherwise
     simulated using horizontal and vertical rules.

   To change the default fonts, you must use 'special' commands in your
Metafont source file, typically via commands like 'slantfont slantlj4'.
There is no default slant font since no one printer is suitable as a
default.  You can make your own by copying one of the existing files,
such as '.../fonts/source/public/misc/' and then running 'mf'
on it.

   For testing purposes, you may it useful to run 'mf-nowin rtest' (hit
RETURN when it stops) to get a 'gf' file of a thorn glyph.  Or use 'mf'
instead of 'mf-nowin' to have the glyph(s) displayed on the screen.
After that, 'gftodvi rtest.2602gf' should produce 'rtest.dvi', which you
process as usual.

   The program accepts the following option, as well as the standard
'-verbose', '-help', and '-version' (*note Common options::):

     Typeset the so-called overflow labels, if any, POINTS TeX points
     from the right edge of the character bounding box.  The default is
     a little over two inches (ten million scaled points, to be
     precise).  Overflow equations are used to locate coordinates when
     their actual position is too crowded with other information.

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