[fpc-pascal] Graphing library
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
(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.
Am 15.11.2020 um 09:33 schrieb Darius Blaszyk via fpc-pascal:
> 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
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