• the Graffy editor by Durst CAD is a commercialization of the original HP Piglet editor.
  • Hershey Fonts (used for Piglet vector font descriptions) PS: I have piglet versions for most of the Hershey font families. They are not in the default distribution, but I am happy to provide them upon request. If we came up with a good way to specify multiple kinds of fonts in piglet (currently, only a single note or text is allowed), then it might make sense to provide multiple typefaces.
  • xfig, a popular X11 drawing editor
  • GNU Readline Library provides a command line history and editor for Piglet.
  • XV - an interactive image manipulation program for X11 handy for viewing Piglet's .ppm screen dumps and converting them to other formats.
  • gawk(1), awk(1) , mawk(1) the ./man/makemans script calls awk(1) to build the Piglet man/html pages. Awk(1) is a very useful scripting language that is basically interpreted C with lots of nice features like built in regular expressions and associative arrays. You can use either gnu awk (the link above) or traditional AT&T awk, or the mawk(1) variant. Whichever you decide to use, make a sym-link to the name awk or change the name of the executable in the "makemans" script. Most modern linux distros will have awk available.
  • valgrind(1), Valgrind is a GPL'd system for debugging and profiling Linux programs. Valgrind can automatically detect many memory management and threading bugs, avoiding hours of frustrating bug-hunting, making your programs more stable. You can also perform detailed profiling to help speed up your programs. I've used the valgrind tools to profile Piglet's memory usage to hunt down memory leaks.
  • Books

    I have found the following books very helpful in writing Piglet:
  • Interactive Computer Graphics, 2nd Edition, Newman and Sproull, Mcgraw-Hill, 1973. (code and discussion of hierarchical data structures).
  • Graphic Gems, Andrew S. Glassner, Academic Press, 1990. (basic matrix algorithms).
  • Fundamentals of Interactive Computer Graphics, J.D.Foley and A. Van Dam, Addison Wesley, 1982. (example code for 2/3-d graphic editors including clipping algorithms).
  • Postscript Language Reference Manual, 2nd Edition, Adobe Systems, Incorporated, Addison-Wesley Publishing Company, 1990. (used in postscript display code for PLOT command).
  • Xlib Reference Manual, Volumes I and II , Edited by Adrian Nye, O'Reilly & Associates, Inc., 1998. (All X11 interaction in Piglet is written directly in Xlib).
  • The C Programming Language, Kernighan and Ritchie.

  • Rick Walker (rick_walker AT omnisterra DOT com)