[Qgis-user] QGIS hanging and bad shapefile export

[Marco Hugentobler]

Hi Gavin

Do you have the possibility to try a current svn version? I think this is 
fixed. The problem is actually not QGIS itself but some slow coordinate 
clipping code in the Qt library.

So in current svn version, QGIS does its own coordinate clipping also on 
windows (it used to do it only on X11 until now).

The problem remains for the print composer, because there QGIS cannot guess 
what pixel coordinate the logical graphics scene coordinates are mapped to. 
Together with Andreas and Jürgen, we are preparing a solution for this.

Regards,
Marco

Am Mittwoch, 9. September 2009 11.33:41 schrieb Gavin Fleming:
> I'm continuing this thread as the problem seems related:
>
> QGIS hangs on zooming close into polygon layers. We experience the
> problem on 2 PCs running Win XP. QGIS has been doing this for several
> versions, including now 1.2. The number of zooms or the extent of the
> zoom might vary but every time it hangs (or takes and EXTREMELY long
> time to zoom) when zoomed in close. This makes it extremely frustrating
> if not impossible to do detailed work such as editing. And it happens
> with shapefiles and PostGIS layers.
>
> The problem does not present in QGIS 1.0.0 on Ubuntu. Seeing Marco's
> answer below to a similar problem (zooming to a selected table record)
> it seems like the common factor might be XP.
>
> This should be tested and fixed on XP as it is still widely used,
> especially on systems with ArcGIS as ArcGIS (9.2 at least) doesn't run
> on Vista, so this bug could a major impact on QGIs acceptance for people
> running dual or transition environments.
>
> Gavin Fleming
>
> Also posted at
> http://forum.qgis.org/viewtopic.php?f=2&t=4936&p=8628#p8628
>
> -----Original Message-----
> From: Marco Pasetti [mailto:marcopstt at gmail.com]
> Sent: 2008 September 10 11:36
> To: Gavin Fleming; qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] QGIS hanging and bad shapefile export
>
> Hi Gavin,
>
> >Two problems have been occurring regularly in QGIS (0.11 on XP)
> >
> >Open attribute table, select one or more records, click 'Zoom to
>
> selected
>
> >records' - QGIS hangs.
>
> I tested it on my notebook running Windows Vista Home Premium (where the
>
> releases of QGIS and GRASS for MS-Windows are built and packaged).
>
> After loading a shapefile I quickly zoomed on selected records from the
> attribute table; no bugs reported.
> I tested the same thing loading a GRASS vector layer: same result, no
> problem at all.
>
> I guess it's a specific XP problem, but, at the moment, I don't have an
> XP
> machine to test on.
>
> >Export as shapefile (PostGIS layer): ArcGIS does not recognise the
>
> extent
>
> >of the shapefile and will not draw it, though attributes are
>
> accessible. If
>
> >you then export it as a shapefile again >from within ArcGIS, the output
> >
> >shapefile is fixed and draws fine. Is this a PostGIS / shapelib / QGIS
> >problem? What's the fix?
>
> I'm afraid, I don't have ArcGIS (nor any ESRI product, actually).
>
> Regards,
>
> Marco
>
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-- 
Dr. Marco Hugentobler
HUGIS - GIS programming and consulting
Honrainweg 5
CH-8038 Zürich
marco at hugis.net
http://homepage.hispeed.ch/hugis/