[Qgis-developer] About feature simplification rendering

[roy roy]

Thank you very mutch Nathan and Alvaro!
Now it's more clear to me, I think this
is very important:

If you have a postgis layer with $area expressions, you only can use 
local simplification

Il 03/06/2016 12:28, A Huarte ha scritto:
> Hi, a few days ago a related pull was merged:
>
> https://github.com/qgis/QGIS/pull/2900
>
> As Nathan said, the simplification only runs in rendering tasks, but 
> before this pull, the original geometry readed from a data source 
> could be simplified when the "simplify" flag is defined in the 
> QgsFeatureRequest used by a FeatureIterator.
>
> Now the geometries never are simplified, the simplification runs using 
> its WKB representation just before it is drawn.
>
> Alvaro
>
> ------------------------------------------------------------------------
> *De:* Nathan Woodrow <madmanwoo at gmail.com>
> *Para:* roy roy <royroge at outlook.com>
> *CC:* qgis-developer <qgis-developer at lists.osgeo.org>
> *Enviado:* Viernes 3 de junio de 2016 12:11
> *Asunto:* Re: [Qgis-developer] About feature simplification rendering
>
> Hey Roy,
>
> Simplification is only for display reasons. Editing will return the 
> full geometry or else that would be bad.
>
> - Nathan
>
> On Fri, Jun 3, 2016 at 8:04 PM, roy roy <royroge at outlook.com 
> <mailto:royroge at outlook.com>> wrote:
>
>     Hi, i've searched in the docs and the web and cannot find
>     this info, just because i'd like to be sure:
>
>     Can the use of feature simplification (Option Rendering) affect
>     in any way my geoprocessing workflow (e.g. using clip, difference
>     etc...)?
>     i ran some test and it seems it does not, i.e. geoprocessing
>     results are
>     not affected by feature simplification option (as it should be I
>     think)
>     Am I correct?
>
>     Thanks, Roy.
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