[jfreechart-dev] [ jfreechart-Patches-2430837 ] Contour plot try out

[SourceForge.net <no...@so...>]

Patches item #2430837, was opened at 2008-12-15 11:36
Message generated for change (Comment added) made by mungady
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=315494&aid=2430837&group_id=15494

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Julien Blaize (jblaize_78)
Assigned to: David Gilbert (mungady)
Summary: Contour plot try out

Initial Comment:
Hello i have used and adapted fortran algorithm for computing contour layout. 
see http://www.crm.umontreal.ca/Galerie/ContourPlotApplet_Eng.html for original project.

i have reworked it and created a dataset and a Renderer for JFreeChart.
you have full sources in jar file and you can launch the jar file to see an example.
(you must have jcommon-1.0.14.jar jfreechart-1.0.11.jar in the same dir) 

i added two screenshot for those who don't want to download launch the test application.

The code is very, very low on comment for the part that does the computation.
All in all it seems to work correctly and provide a nice alternative to scatter plot for large data.

Any comments is welcome.

Julien Blaize


----------------------------------------------------------------------

>Comment By: David Gilbert (mungady)
Date: 2008-12-19 11:08

Message:
I have a copy of the Snyder article now, I just needed to pay US$10 to ACM
and I have the Fortran code too.  There's no mention of the licence, but I
will start by reading the details of the algorithm to see if I can
understand how it works.

Regards,

Dave

----------------------------------------------------------------------

Comment By: Julien Blaize (jblaize_78)
Date: 2008-12-19 10:35

Message:
Hi Dave,

I understand your concerns about the licence. I don't know what could be
the licence for the java code from the applet page (montreal). I am not
legal expert and cannot give you advice on this, maybe i should have think
of this before posting.
Anyway i think the original fortran code by Snyder is in a book and was
written at a time where GPL didn't even exists ... (i have found the
fortran code also on the net but can't remenber where)
Your idea to contact mactech and know the licence for the content of the
article seems the best option.

Maybe i can let you do it ? as my english writing is poor... (i am french
and wasn't listening enought in english classes)

Regards.

----------------------------------------------------------------------

Comment By: David Gilbert (mungady)
Date: 2008-12-19 10:06

Message:
Hi Julien,

Nice work, this shows a lot of promise!  My first question, though, is:
what is the licence of the original code that you've derived it from?  I
found the link to the MacTech article:

http://www.mactech.com/articles/mactech/Vol.13/13.09/ContourPlottinginJava/

...but it doesn't mention any licence explicitly.  I'll try to get hold of
the ACM article, if it doesn't cost too much, and see what it mentions
regarding copyright and licence terms.  In the worst case, we could
reimplement the algorithm from scratch.

Sorry to get straight into licence questions, but it is necessary to take
some care to ensure that the code going into JFreeChart can be freely
licensed under the terms of the GNU Lesser General Public Licence.

Best regards,

Dave Gilbert
JFreeChart Project Leader

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=315494&aid=2430837&group_id=15494