[Qgis-developer] GEOS error Exception: IllegalArgumentException: Invalid number of points in LinearRing found 3 - must be 0 or >= 4

[Janneke van Dijk]

Hi Alvaro,
Thanks for explaining this!
greetings,
Janneke

On 15/05/2016 03:05, A Huarte wrote:
> Hi Janneke, you are right. The simplification process is executed just 
> when the original geometry is read from data source and it can create 
> invalid geometries. These invalid geometries will be used 
> in subsequent processes using geometry calculations.
>
> You can disable the simplification of a layer from its options menu -> 
> properties -> rendering -> uncheck the "simplify geometry" CheckBox. 
> Or you can disable the simplification by default from -> settings -> 
> options -> rendering -> uncheck the "Enable feature simplification by 
> default ..." CheckBox.
>
> This pull request moves the simplification just when the geometry is 
> rendered, the geometry remains unchanged from the data source in order 
> to avoid these problems.
>
> Kind regards
> Alvaro
>
>
> ------------------------------------------------------------------------
> *De:* Janneke van Dijk <janneke.qgis at gmail.com>
> *Para:* A Huarte <ahuarte47 at yahoo.es>; 
> "qgis-developer at lists.osgeo.org" <qgis-developer at lists.osgeo.org>
> *Enviado:* Sábado 14 de Mayo de 2016 20:30
> *Asunto:* Re: [Qgis-developer] GEOS error Exception: 
> IllegalArgumentException: Invalid number of points in LinearRing found 
> 3 - must be 0 or >= 4
>
> Hi Alvaro,
>
> How do I disable the on-the-fly simplification?
> Do I understand it correctly that the error causes problems with a 
> virtual field with a geometry calculation in it? Would that also be 
> solved by disabling on-the-fly simplification? Or should I avoid the 
> issues by not making it a virtual field - if I know that the polygons 
> won't be edited?
>
> Thanks for your insights,
> Janneke
>
> On 13/05/2016 11:08, A Huarte wrote:
> Hi, I think this pull https://github.com/qgis/QGIS/pull/2900 fixes the 
> error.
>
> But it is pending to merge, It needs to fix some tests to be accepted 
> finally.
> Meanwhile you can disable the on-the-fly simplification of the layer.
>
> Kind regards
> Alvaro
>
> ------------------------------------------------------------------------
> *De:* Janneke van Dijk <janneke.qgis at gmail.com> 
> <mailto:janneke.qgis at gmail.com>
> *Para:* qgis-developer at lists.osgeo.org 
> <mailto:qgis-developer at lists.osgeo.org>
> *Enviado:* Viernes 13 de Mayo de 2016 9:53
> *Asunto:* [Qgis-developer] GEOS error Exception: 
> IllegalArgumentException: Invalid number of points in LinearRing found 
> 3 - must be 0 or >= 4
>
> Dear list,
>
> Using QGIS 2.14.2 on Windows 7 I get the following error message when
> zooming out on a shapefile layer that has labels switched on:
>
> GEOS
> Exception: IllegalArgumentException: Invalid number of points in
> LinearRing found 3 - must be 0 or >= 4
>
> It seems to be an old bug (https://hub.qgis.org/issues/9375) that was
> fixed 2 years ago.
>
> It doesn't seem to cause any problems otherwise. Anyone else have this
> issue? Should I file a new bug report?
>
> Regards,
> Janneke
>
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