Thanks for the help. I shall modify the code and look at the example
too. I also decided to re-install. Shall report on results.
Cheers,
Heinz
On 09/04/2010 03:30 PM, David Boddie wrote:
On Sat Sep 4 08:00:06 BST 2010, Preisig, Heinz A wrote:
After upgrading Ubuntu 9.10 to 10.04 I encounter some problems with
running a graphics application I built last year. It uses the mechanisms
described in the example "elasticnodes". The two application represent a
graph, which when moving the nodes also update the location of the arcs.
In both cases the arcs are not updated. In fact the example does not
show the arcs when starting it. My application does show the arcs, but
it does not update. I dug for some hours in the code, but could not find
a problem. It seems it does not get into the "itemChange" method of the
"QGraphicsItem" class. Some manipulations resulted in abortion of the
task, which when running from within Eclipse did not produce an error
message. From the terminal I got an occasional segmentation fault.
I don't know why you are getting segmentation faults, but the problem with
the itemChange method is due to a change in behaviour in Qt 4.6. You now
need to call the item's setFlag method with the ItemSendsGeometryChanges
flag to get notifications when items move.
David
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Heinz A Preisig
Professor of Process Systems Engineering Private:
Øvre Bakklandet 62 B, 7013 Trondheim, Norway
Department of Chemical Engineering
Norwegian University of Science and Technology
N -- 7491 Trondheim, Norway Tel direct: +47 735 92807
Tel mob: +47 9754 1334
e-mail: heinz.prei...@chemeng.ntnu.no <mailto:heinz.prei...@chemeng.ntnu.no>
web: www.chemeng.ntnu.no\~preisig <http://www.chemeng.ntnu.no/%7Epreisig>
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