[Qgis-developer] CGAL in QGIS ?

Michaël Douchin michael.douchin at laposte.net
Wed Jan 30 09:50:41 EST 2008

Impressive indeed
For example, try (under windows) the demo of alpha shape (which we can 
use to find concave hull of a set of points :

I had the idea looking the pyrol tools plugin under OpenJump which 
provide delaunay triangulation, iso lines, terrain modeling, etc.
(see : http://openjump.org/wiki/show/Plugins)

I think native function under qgis will be a big step (for those who do 
not want to create grass vector layers from existing ones)
In the same direction, I "almost" finished a simple convex hull plugin 
for qgis (using the python bindings).

I also posted before to ask the list about intersection functionnality 
under qgis, and I think it is "simple" to develop a layer intersection 
plugin too. My pbm : too many ideas and few time  :-)

For the CGAL implementation under qgis, I think it is above my skill now 
(I tried to use the python binding in a console, import successfully the 
dll, but could not see how to use the functions :-(


Tim Sutton a écrit :
> Hi
> Wow! That lib looks really impressive. Once QGIS 1.0 is out the way we
> can start to look more seriously at creating these types of functions
> in the core of QGIS.
> Regards
> Tim
> 2008/1/30, Michaël Douchin <michael.douchin at laposte.net>:
>> Hi all,
>> After a deep research, I found the projetct CGAL, wich provides
>> geometrical algorithm : voronoi diagram, convex hull, triangulation, etc.
>> http://www.cgal.org/
>> They provide python bindings too ( http://cgal-python.gforge.inria.fr/ )
>> Do you think this could be used in qgis ? Or do you think the grass
>> tools a sufficent ?
>> Kimaidou
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