[fpc-pascal] Graphing library

[Markus Greim]

Hello Bernd,


there is a bachelor thesis from Jörg Winkler, 2013 in the net (in German): 


"OpenGL-basierter logischer Gerätetreiber für ein Grafisches Kernsystem"
Entwicklung eines logischen GKS Gerätetreibers
auf der Basis von OpenGL


https://docplayer.org/20014258-Entwicklung-eines-logischen-gks-geraetetreibers-auf-der-basis-von-opengl.html


It includes the source code (in C) . Seems to be a GKS to OpenGL software. 


AFAIK the author is on GitHub, so may be you can ask him for some details or the source files: 
https://github.com/joergi-w

Kind Regards


Markus

--- original message ---
On November 15, 2020, 11:25 PM GMT+1 fpc-pascal at lists.freepascal.org wrote:



Hi, 


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: 

http://bernd-oppolzer.de/fdynsb.pdf

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 GOUTHPGL, 

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:
http://nsucgcourse.github.io/lectures/Lecture01/Materials/Graphical%20Kernel%20System.pdf

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

Bernd 




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





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