Programming in Emacs Lisp
15.3 Need for Printed Axes
A graph needs printed axes, so you can orient yourself. For a do-once
project, it may be reasonable to draw the axes by hand using Emacs'
Picture mode; but a graph drawing function may be used more than once.
For this reason, I have written enhancements to the basic
print-graph-body function that automatically print labels for
the horizontal and vertical axes. Since the label printing functions
do not contain much new material, I have placed their description in
an appendix. See section A Graph with Labelled Axes.