fdm is a bit of eye candy for the X Window System. Little lines wiggle around, follow each other, bounce through mazes, and leave pretty trails.
To see what fdm can do, run it a few times without any command line arguments. Each time you run it, it chooses randomly from among several pre-defined modes. You can make it do many other things as well, if you take the time to read the documentation.
Documentation: The file manual.txt is the manual. The file fdmkeys.unix gives a sort of flowchart of all the keys you can use.
It's easy to use fdm with xscreensaver. Just tell xscreensaver to invoke fdm with the "-root" option. Also, fdm.c may be included with xscreensaver in the future.
The yarandom and usleep files are taken from the xscreensaver-3.33 package, to which this notice applies:
xscreensaver, Copyright (c) 1997, 1998 by Jamie Zawinski <jwz@jwz.org> Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.
I'd appreciate any comments. Or just send me a note to let me know you use the program. I'd love to hear from you!
-Tyler Pierce <tyler@alumni.brown.edu>