This is a PostScript program to generate optical encoder wheels that can be printed on a laser printer. Unlike similar programs, it is extremely flexible, and has many features, such as automatic text scaling and page filling.
To use, open the file in a text editor and edit the parameters in the configuration area. Then, open it in a postscript viewer/interpreter (such as ghostview, acrobat distiller, ps2pdf, etc.) and print your encoders to a transparency.