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 [rs]D commands will not produce any output.

There is an additional drawing command available:

[rs]D'R dh dv'

Draw a rule (solid black rectangle), with one corner at the current position, and the diagonally opposite corner at the current position +(dh,dv). Afterwards the current position will be at the opposite corner. This produces a rule in the dvi file and so can be printed even with a driver that does not support the tpic specials unlike the other [rs]D commands.

The groff command [rs]X'anything' is translated into the same command in the dvi file as would be produced by [rs]special{anything} in TeX; anything may not contain a newline.

For inclusion of EPS image files, grodvi loads pspic.tmac automatically, providing the PSPIC macro. Please check grops (1) for a detailed description of this macro.

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

internalname name The name of the tfm file (without the .tfm extension) is name.

checksum n

The checksum in the tfm file is n.

designsize n

The designsize in the tfm file is n.

These are automatically generated by tfmtodit.

The default color for [rs]m and [rs]M is black. Currently, the drawing color for [rs]D commands is always black, and fill color values are translated to gray.

In troff the [rs]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.

-d

Do not use tpic specials to implement drawing commands. Horizontal and vertical lines will be implemented by rules. Other drawing commands will be ignored.

-v

Print the version number.

-wn

Set the default line thickness to n thousandths of an em. If this option isn't specified, the line thickness defaults to 0.04~em.

-Fdir

Prepend directory dir/devname to the search path for font and device description files; name is the name of the device, usually dvi.

TR

CM Roman (cmr10)

TI

CM Text Italic (cmti10)

TB

CM Bold Extended Roman (cmbx10)

TBI

CM Bold Extended Text Italic (cmbxti10)

HR

CM Sans Serif (cmss10)

HI

CM Slanted Sans Serif (cmssi10)

HB

CM Sans Serif Bold Extended (cmssbx10)

HBI

CM Slanted Sans Serif Bold Extended (cmssbxo10)

There are also the following fonts which are not members of a family:

CW

CM Typewriter Text (cmtt10)

CWI

CM Italic Typewriter Text (cmitt10)

Special fonts are MI (cmmi10), S (cmsy10), EX (cmex10), 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 (loading the file ec.tmac) EC and TC fonts are used. 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.

/usr/share/groff/1.18.1.1/font/devdvi/DESC

Device description file.

/usr/share/groff/1.18.1.1/font/devdvi/F

Font description file for font F.

/usr/share/groff/1.18.1.1/tmac/dvi.tmac

Macros for use with grodvi.

/usr/share/groff/1.18.1.1/tmac/ec.tmac

Macros to switch to EC fonts.

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.