It is fascinating for me that, twenty years after the
very first versions of GCLC and with many related tools
that apeared in the meanwhile, there is still a steady
and wide need for the tool GCLC. With thousands of GCLC
users worldwide, with many books, journal articles, and theses
illustrated with the help of GCLC, and with many courses
on different levels that are taught using GCLC, I am encouraged
to get back to maintaining GCLC and adding new features
after several quiet years.
The first big news is that there is a completely new
release (GCLC 2015) including (finally) a GUI version of
GCLC for Linux! New features hopefully soon.
Predrag Janičić [home page]
November 2015


GCLC (from "Geometry Constructions > LaTeX
Converter") is a tool for visualizing geometry, and for producing mathematical
illustrations.
Its main purposes are:
 producing digital mathematical illustrations of high quality;
 use in teaching geometry;
 use in studying geometry and as a research tool.
The basic idea behind GCLC is that constructions are formal procedures,
rather than drawings. Thus, in GCLC, producing mathematical illustrations
is based on "describing figures" rather than on "drawing figures".
Created figures, of course, can be displayed and can be exported
to LaTeX and other formats.
Although GCLC was initially built as a tool for producing LaTeX
figures from descriptions of geometric constructions, now it is much
more than that. It provides easytouse support for many isometric
transformations, conics, parametric curves, dealing with expressions,
flow control, automated theorem proving, etc.
There versions for Windows and for Linux.
There are command line versions and versions with graphical
user interfaces (that provide a range of additional functionalities).
GCLC had several releases since 1996. It has thousands of users wordwide
and it has been used for producing digital illustrations for a number of
books, journal articles, theses, and in a number of highschool and university
courses worldwide.

 Freely available;
 Support for a range of elementary and compound constructions,
and isometric transformations;
 Support for symbolic expressions, second order curves, parametric
curves, flow control, userdefined functions, etc;
 Userfriendly interface, interactive work, animations, tracing
points, "watch window" ("geometry calculator"), and other tools;
 Support for drawing trees and graphs;
 Builtin automated theorem provers, capable of proving many
complex theorems;
 Simple, easy to use, small in size;
 Export of high quality figures into LaTeX (simple LaTeX format,
PSTricks format, TikZ format), EPS (Encapsualted PostScript), SVG
(Scalable Vector Graphics), bitmap, PNG, JPG format;
 Command line and version with graphical user interface both for
Windows and Linux;
 Import from JavaView JVX format.

Latest release:
 Linux:
GCLC 2015 (beta)  command line version (gclc), GUI version (GCLC), manual, sample files, etc. (available since Nov 1, 2015)
 Windows:
GCLC 2015 (beta)  command line version (gclc.exe), GUI version (GCLC.exe), manual, sample files, etc. (available since Nov 1, 2015)
Also available:
The original address of this page is:
www.matf.bg.ac.rs/~janicic/gclc (mirrored versions are not always uptodate)
GCLC is available also from EMIS (The European Mathematical Information Service) servers:
http://www.emis.de/misc/software/gclc/.

GCLC is being developed by Predrag
Janičić (Faculty of Mathematics, University of Belgrade) and, in some parts,
by Predrag Janičić and his coauthors:

Ivan Trajković (University of Belgrade, Serbia)  coauthor of the graphical
interface for WinGCLC (2003);

Pedro Quaresma (University of Coimbra, Portugal) 
coauthor of the theorem prover based on the area method;

Goran Predović (University of Belgrade, Serbia)  the main author of
the theorem provers based on the Wu's methods and on the
Groebner bases method;

Luka Tomašević (University of Belgrade, Serbia) 
the main author of the support for graph drawing;

Konrad Polthier and Klaus Hildebrandt (Technical University,
Berlin, Germany)  coauthors of the JavaView to GCLC converter).

Pedro Quaresma (University of Coimbra,
Portugal), Jelena Tomašević (University of Belgrade, Serbia), Milena
VujoševićJaničić (University of Belgrade, Serbia)  coauthors of the support for
XML.

 If you use GCLC package, please let me know by sending an email to
(Predrag Janicic);
I will put you on the GCLC mailing list and inform you about new releases of GCLC.
 Please send me your comments and suggestions to
. Your
feedback would be very much appreciated and would help in improving the
future releases of GCLC.
 If you used GCLC for producing figures for your
book or a paper, I would be happy to hear about that.
 Please send me your GCLC gems and I will put them on this page.


This software is protected by the Creative Commons licence CC BYND:
AttributionNoDerivatives 4.0 International.
This license allows for redistribution, commercial and noncommercial,
as long as it is passed along unchanged and in whole, with credit to the author.
 You may install and run this untouched software without any restrictions.
 All output of this software is your property. You are free to use it in
teaching, studying, research, and in producing digital illustrations.
 THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 (c) Predrag Janicic 19962015
