[Community] Shapely is_empty fails on Linux

[Patrick Hartling]

We have run into a strange problem with the is_empty property on Shapely
goemetry objects failing on Linux. We are using r1485 from the Shapely 1.2
branch with GEOS 3.1.1 and Python 2.6.2 on 64-bit Ubuntu Linux 9.04. The
code below demonstrates the problem:

import shapely.geometry
assert shapely.geometry.Point(1,1).is_empty == False

The assertion fails on Linux, but it behaves correctly on Windows and on
64-bit Mac OS X 10.6. I verified that using GEOS directly in a C++ test
program works. It seems like this could be a ctypes problem since the
Shapely code is the same in these cases. Has anyone else encountered this or
similar misbehavior between platforms?

Thanks in advance for any insight on this issue.

 -Patrick


-- 
Patrick L. Hartling
Senior Software Engineer, Priority 5
http://www.priority5.com/

The information transmitted in this communication is intended only for
the person or entity to which it is addressed and contains proprietary
material. Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited. If you
received this in error, please destroy any copies, contact the sender
and delete the material from any computer.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 252 bytes
Desc: OpenPGP digital signature
URL: <http://lists.gispython.org/pipermail/community/attachments/20100121/722ab95a/attachment.pgp>