/contrib/groff/src/preproc/grn/README
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- This is grn from the Berkeley ditroff distribution. It has no
- AT&T code and is therefore freely distributable.
- Tim Theisen <tim@cs.wisc.edu>
- =====================================================================
- This is the modified code for the groff. It uses the different
- devxxx format that is ascii rather than binary as in the
- Berkeley distribution. Since groff does not have the \Ds option
- for line drawing (dotted, dashed, etc.), this version includes
- the routines for drawing curves and arcs, so it does not use the
- \D~, \Da nor \Dc. Although also included in here is a routine
- for drawing the optional gremlin style curves, it is not used
- because the gremlin editor uses the conventional spline
- algorithm. The Berkeley grn has the choice of different
- stipples. Here, only different shades of gray will be painted
- depending on the gremlin file. It is possible to upgrade this at
- a later time. (Daniel Senderowicz <daniel@synchrods.com> 12/28/99)
- =====================================================================
- Gremlin produces three types of curves: B-Splines, interpolated
- curves and Bezier. As the original Berkeley grn, now groff grn
- will honor B-Splines and interpolated curves. Bezier curves will
- be printed as B-Splines. (Daniel Senderowicz <daniel@synchrods.com>
- 10/04/02)
- =====================================================================
- It has been further modified by Werner Lemberg <wl@gnu.org> to fit
- better into the groff package.
- . Replaced Makefile with Makefile.sub.
- . Removed dev.h since it is unused.
- . Renamed grn.1 to grn.man; this man page has been extensively
- revised.
- . Used error() and fatal() from libgroff for all source files.
- . Renamed *.c to *.cpp; updates as needed for C++ (prototypes, proper
- casts, standard header files etc). Heavy formatting.
- . main.cpp:
- Using groff's default values instead of DEVDIR, DEFAULTDEV, PRINTER,
- TYPESETTER, and GREMLIB.
- `res' is now an integer.
- Added `-C' command flag (for compatibility mode) as with other
- preprocessors.
- Added `-F' and `-v' option (similar to troff).
- Renamed `-L' option to `-M' for consistence.
- Removed `-P' option.
- Using font::load_desc() for scanning DESC files.
- Removed SYSV-specific code.
- Using macro_path.open_file() for getting gremlin graphic files.
- Added usage().