It is possible to have whitespace between a command line option and its parameter.
The dvi file generated by grodvi can be printed by any correctly-written dvi driver. The troff drawing primitives are implemented using the tpic version~2 specials. If the driver does not support these, the \D commands will not produce any output.
There is an additional drawing command available:
The groff command \X'anything' is translated into the same command in the dvi file as would be produced by \special{anything} in TeX; anything may not contain a newline.
For inclusion of EPS image files, -Tdvi loads pspic.tmac automatically, providing the PSPIC macro. Please check groff_tmac(5) for a detailed description.
Font files for grodvi can be created from tfm files using tfmtodit(1). The font description file should contain the following additional commands: u+2n
These are automatically generated by tfmtodit.
The default color for \m and \M is black. Currently, the drawing color for \D commands is always black, and fill color values are translated to gray.
In troff the \N escape sequence can be used to access characters by their position in the corresponding tfm file; all characters in the tfm file can be accessed this way.
By design, the DVI format doesn't care about physical dimensions of the output medium. Instead, grodvi emits the equivalent to TeX's \special{papersize=width,length} on the first page; dvips (and possibly other DVI drivers) then sets the page size accordingly. If either the page width or length is not positive, no papersize special is output.
There are also the following fonts which are not members of a family:
Special fonts are MI (cmmi10), S (cmsy10), EX (cmex10), SC (cmtex10, only for CW), and, perhaps surprisingly, TR, TI, and CW, due to the different font encodings of text fonts. For italic fonts, CWI is used instead of CW.
Finally, the symbol fonts of the American Mathematical Society are available as special fonts SA (msam10) and SB (msbm10). These two fonts are not mounted by default.
Using the option -mec (which loads the file ec.tmac) provides the EC and TC fonts. The design of the EC family is very similar to that of the CM fonts; additionally, they give a much better coverage of groff symbols. Note that ec.tmac must be called before any language-specific files; it doesn't take care of hcode values.
When using the -d option with boxed tables, vertical and horizontal lines can sometimes protrude by one pixel. This is a consequence of the way TeX requires that the heights and widths of rules be rounded.
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