[fpc-pascal] Graphing library

Bernd Oppolzer bernd.oppolzer at t-online.de
Sun Nov 15 23:20:05 CET 2020


I don't know if this can help you, but in the 1980s I worked with a 
library called GKS (graphic kernel system)
which I used to build such graphics like the following example:

This programs that did this were written in Pascal at that time.

It still works today for me (the customer still uses this software),
although is it C today, and GKS is not available any more.
What I did: the original GKS calls are written to files (some sort of 
GKS metafile, but not the
original 1980s format), and then this file format is read by a C program 
which translates this (proprietary) format to HPGL. The HPGL files are 
either sent to
HP plotters or translated to PDF using public domain software; see the 
file above.
(GOUTHGPL was a Pascal program in the 1990s, too).

IMO, you could easily write the "GKS metafile format" with Pascal;
in fact, it is simply is a sort of logfile of the GKS calls.

Here is an old paper about the GKS system: 

The translator GOUTHGPL supports only a small subset of GKS; see again 
the example picture above.

If you are interested for more details, you could contact me offline.

Kind regards


Am 15.11.2020 um 09:33 schrieb Darius Blaszyk via fpc-pascal:
> Hi,
> I am looking for a simple to use non-visual graphing library to 
> produce x-y plots in a  raster file format (similar to how pyplot 
> works). Rather than developing something from scratch or writing a 
> wrapper to GNU plot (additional dependency), I was hoping something 
> like this already would exist that I could build upon.
> Thank you for any tips!
> Rgds, Darius
> _______________________________________________
> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
> https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freepascal.org/pipermail/fpc-pascal/attachments/20201115/75a6fddd/attachment.htm>

More information about the fpc-pascal mailing list