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From: Peter Gerwinski
Subject: graphic
Date: 22 Jun 2000, 18:48:00

Hello, Nathalie and everyone!

> I just wonder if it is possible to plot some graphs with pascal?
> If the answer is yes, how it works?

You can use the GRX graphics library from GNU Pascal.
I just uploaded a new GRX snapshot - see:

    http://www.gnu.de/software/GRX/

The included units `pascal/grx20.pas' and `pascal/bgi/bgi2grx.pas'
(the latter one being a clone of Borland's "Graph") will need some
tweaking to work with current versions of GPC.  Be welcome to ask
on this list if you have problems with them.  I hope that we will
have the possibility to include up-to-date versions of these units
in the GPC distribution in the future.-

> And if not, how can I use my output files to easily generate graphs?

If your graphs are graphs of mathematical functions, I recommend
to output a table of values like this

    0.0       0.00
    0.1       0.01
    0.2       0.04
    0.3       0.09
    0.4       0.16
    0.5       0.25
    ...       ...

with a command like:

    WriteLn (x : 7 : 1, f (x) : 11 : 2)

This simple format is understood by many plotting programs such
as Gnuplot.  (Although the name "Gnuplot" is not coming from the
GNU project, it is listed under http://www.gnu.org/software/.:-)

Hope this helps,

    Peter

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