|Because GraphiC supports variable output page sizes, GraphiC needs
to know how to map the internal pixel coordinate system to your output
device. You are free to specify this scaling, but we recommend that
it match the plot length of an L printer dump that you specified
when you ran EQUIP (in DOS) or set your printer defaults (GUI environments).
If you make any other choice, the sizes on your printer output will not
match the specifications in your program. You may call PixPerUnit()
instead of PlotLength() to specify the scaling in terms of pixels
This function must be called before page()
or the scaling will not be correct.