Mail Archives: geda-user/2012/12/07/12:14:40

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Subject: Re: [geda-user] Router fun with rubberbands
From: Stefan Salewski <mail AT ssalewski DOT de>
To: geda-user AT delorie DOT com
In-Reply-To: <k9sr8u$29l$>
References: <1354748372 DOT 3386 DOT 3 DOT camel AT AMD64X2> <k9sr8u$29l$1 AT ger DOT gmane DOT org>
Date: Fri, 07 Dec 2012 18:10:05 +0100
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On Fri, 2012-12-07 at 14:34 +0100, Kai-Martin Knaak wrote:
> Stefan Salewski wrote:
> > I just fixed some trivial bugs of my toy router and put some pictures on
> > my page:
> >
> Cool.
> Just curious: Is there any reltion to the topo router project that was 
> started during Google summer of code?
> I hope, your project is going fly!
> ---<)kaimartin(>---

There are only some indirect relations to Anthony's router:

-- I was impressed by his pictures
-- I use GTS library for delaunay triangulation as he did

Thats all -- I looked some hours at his code, but I was only able to
understand very small portions. The main problem for me was, that I was
not able to see relations between his code and the papers. He made much
use of functions of the GTS library, while I use that library only for
the initial delaunay triangulation. Indeed, it was my impression that he
followed not very close the papers and the PhD thesis of Tal Dayan. I
think that Anthony is a very smart person and he has coded much of his
own ideas. One problem is that low level C language makes it really very
difficult to develop and debug such type of router.

Currently I am investigating switching from GTS library to CGAL. GTS is
plain C, so it was easy for me to code a Ruby interface for the Delaunay
part. But GTS mailing list is inactive since May 2012 -- my subscription
failed, and the original authors is not really interested. GTS is ok for
me, I do only need the initial constrained delaunay triangulation,
exactly the neighbor vertices for each vertex. But I think I will have a
look at CGAL in the next weeks, its a large C++ library. Bindings to
other languages are not really well supported, there is some basic
support for Java and Python. I read that CGAL makes use of templates,
which makes it difficult to build bindings which support all the
functionality. I don't know enough about C++ to build direct bindings
(Java and Python uses SWIG for the bindings), but with some plain C glue
code it should be possible.

I hope there is nothing wrong with the CGAL license, seems to be dual
GPL and commercial. That should be OK, but there is a strange fork
project site available:
Maybe it is only a mirror with GPL license, I have to investigate that.

Best regards

Stefan Salewski

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