[Qgis-developer] QGIS+NX [was: X11 crash and clipping code]
tutey at o2.pl
Tue Apr 1 15:19:58 EDT 2008
Gary Sherman pisze:
> Has anybody made changes to the clipping code found in
> src/core/qgsclipper.* ?
> This issue (URL below) has a remarkable resemblance to the X11 bug that
> we were plagued with until clipping was instituted:
As nobody replies I thought it won't hurt if I add my 0.02 USD, though
maybe not strictly related.
Using QGIS via NX (FreeNX) I have reproducible session shutdowns. They
happen only with QGIS and only with particular vector data, that consist
of many polygons with numerous vertices (eg. like raster to vector output).
I asked about the possible culprit on FreeNX ML  to not much avail,
but by the way I learned that a similar issue has already been reported
to NoMachine co. few months ago . They have recently fixed the issue
, though the fix has not yet been released by NoMachine nor FreeNX AFAIK.
My problem with QGIS & FreeNX in detail:
1. Establish an NX connection in *MODEM/ISDN/ADSL or WAN* mode (LAN mode
will not expose the problem).
2. Start QGIS on the server.
3. Settings > Options > Rendering > Fix problems with incorectly filled
4. Load a specific shapefile into QGIS, like this one  (1.6MB).
5. The NX session shuts down when rendering in QGIS starts.
I can reconnect soon after, but redrawing the particular shapefile makes
the session shut down again.
I'm using the "Fix problems with incorectly filled
polygons" becuase otherwise various display artifacts happen when using
QGIS via NX: invisible polygon of the measure area tool, invisible line
of the measure length tool, the backdrop map gets erased in the vicinity
of vertex being currently dragged when digitizing etc. However with "Fix
problems with incorectly filled polygons" I don't have crashes with any
vector data, in any NX connection mode. It seems NX and QGIS don't like
I wonder if my NX problems and the X server crash you mention might have
something in common.
I will soon check how the sample dataset mentioned on the Launchpad
interacts with NX+QGIS.
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