XYPLOT for Linux and Windows may be extended with the use of
source code modules. The currently available
add-on modules
illustrate how the user may write his or her own
extensions to XYPLOT. A module consists of one or more
text files containing source code written in
kForth,
an implementation of the Forth programming language.
The files have the extension .4TH.
When XYPLOT is installed on a Linux system, each user
maintains his/her own set of modules. These are located
in the user's $HOME/.xyplot
directory and the directory may be reached by typing
xyplot.4th must be present
in this directory. All other modules are optional. In order
to make a new module be loaded when xyplot begins to execute,
the new module should be placed in this directory. Then, the
file xyplot.4th should be edited to include a
line such as:include mymodule.4thincluded near the bottom
of xyplot.4th. Simply add the include
statement after the includes for the standard modules.