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NAME
     gftodvi - make proof sheets from generic font files

SYNOPSIS
     gftodvi [  -overflow-label-offset=real  ]  [  -verbose  ]  [
     gf_file_name ]

DESCRIPTION
     This manual page is not meant to be  exhaustive.   The  com-
     plete  documentation for this version of TeX can be found in
     the info file or manual Web2C: A TeX implementation.

     The gftodvi program converts a generic font (gf) file output
     by,  for  example, mf(1), to a device independent (DVI) file
     (that can then be typeset using the same software  that  has
     already been written for TeX). The characters in the gf file
     will appear one per page, with labels, titles,  and  annota-
     tions  as  specified  in Appendix H (Hardcopy Proofs) of The
     Metafontbook.

     gftodvi uses other fonts in addition to the main gf file.  A
     `gray' font is used to typeset the pixels that actually make
     up the character. (We wouldn't want all  the  pixels  to  be
     simply  black,  since  then  labels,  key  points, and other
     information would be lost.)  A `title' font is used for  the
     information  at  the top of the page. A `label' font is used
     for the labels on key points of the figure. A  `slant'  font
     is  used  to typeset diagonal lines, which otherwise have to
     be simulated  using  horizontal  and  vertical  rules.   The
     default  gray,  title,  and  label fonts are gray, cmr8, and
     cmtt10, respectively; there is no default slant font.

     To change the default fonts, you can give  special  commands
     in  your  Metafont  source file, or you can change the fonts
     online. An online dialog ensues if you end the  gf_file_name
     with a `/'. For example,
       gftodvi cmr10.300gf/
       Special font substitution: grayfont black
       OK; any more? grayfontarea /home/art/don/
       OK; any more? slantfont /home/fonts/slantimagen6
       OK; any more? <RET>
     will  use  /home/art/don/black  as  the  `gray'   font   and
     /home/fonts/slantimagen6  as  the  `slant'  font  (this name
     indicates a font for lines with slope 1/6 at the  resolution
     of an Imagen printer).

     The gf_file_name on the command line must be complete.  (The
     program  prompts  you for it if you don't give it.)  Because
     the resolution is part of the extension, it would  not  make
     sense  to  append a default extension as is done with TeX or
     DVI-reading software. The output file name defaults  to  the
     same  root as the gf file, with the dvi extension added. For
     example, the input file cmr10.2602gf would become cmr10.dvi.

OPTIONS
     The argument to -overflow-label-offset  specifies  the  dis-
     tance  from  the right edge of the character bounding box at
     which the overflow equations  (if  any)  are  typeset.   The
     value  is given in TeX points.  The default is a little over
     two inches.

     Without the  -verbose  option,  gftodvi  operates  silently.
     With it, a banner and progress report are printed on stdout.

ENVIRONMENT
     gftodvi looks for gf_file_name using the  environment  vari-
     able GFFONTS.  If that is not set, it uses the variable TEX-
     FONTS. If that is not set, it uses the system default.

     See tex(1) for the details of the searching.

FILES
     {gray.tfm,...}
          The default fonts.

     {gray.mf,...}
          The Metafont sources.

SEE ALSO
     tex(1), mf(1).
     Donald E. Knuth, The Metafontbook (Volume C of Computers and
     Typesetting), Addison-Wesley, 1986, ISBN 0-201-13445-4.
     Donald E. Knuth et al., Metafontware.

AUTHORS
     Donald E. Knuth wrote the program. It was published as  part
     of the Metafontware technical report, available from the TeX
     Users Group.  Paul Richards ported it to Unix.

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