[Qgis-developer] vector rendering improvement patch

[G. Allegri]

2013/10/23 A Huarte <ahuarte47 at yahoo.es>

> My simplification algorithm is a new method that uses the MapToPixel data
> of current QgsRenderContext to ignore in the drawing of geometry the
> "equal-pixel device points". It has no effect if the geometry is not far
> of current point of view of map.
>
> It does not uses the ST_Simplify() method (douglas-peucker algorithm)
> where the geometry is simplified for other "similar" geometry.
>

Oh, I see. So it's "transparent" to the user, he doesn't notice the
simplification, right?



>
>
>   ------------------------------
>  *De:* G. Allegri <giohappy at gmail.com>
> *Para:* A Huarte <ahuarte47 at yahoo.es>
> *CC:* qgis-developer <qgis-developer at lists.osgeo.org>
> *Enviado:* Miércoles 23 de octubre de 2013 8:46
> *Asunto:* Re: [Qgis-developer] vector rendering improvement patch
>
>
> > Ok Andreas, I'm going to make it configurable, will present a new option
> in the main properties form of the layer
> I suppose he meant to do not draw simplidied geometries during editing
> because it would obviously lead to produce unconsistent edits.
> giovanni
> >
> > About of simplification in "editmode". I think is not necessary disable
> it, the simplification runs only on the method of painting
> "QgsVectorLayer::draw", not when you retrieve a geometry to treat your
> information.
> >
> > Alvaro
> >
> >> ________________________________
> >> De: Andreas Neumann <a.neumann at carto.net>
> >> Para: qgis-developer at lists.osgeo.org
> >> Enviado: Martes 22 de octubre de 2013 14:03
> >> Asunto: Re: [Qgis-developer] vector rendering improvement patch
> >>
> >> Hi,
> >>
> >> Thank you for your work!
> >>
> >> Yes - I think it should be configurable. It should also automatically be
> >> turned off if a layer is in edit mode.
> >>
> >> Just my opinion,
> >> Andreas
> >>
> >> Am 22.10.2013 14:01, schrieb A Huarte:
> >> > Hello Vincent!
> >> > For now, it is not configurable, automatically applies to all vector
> layer to be painted.
> >> >
> >> > I think that the userneed not configure this, of course, if
> dev-community suggests, will be as you say! :-)
> >> >
> >> >
> >> >> Is it configurable in the interface for each layer independantly ?
> >It should probably be, as according to the style applied to the
> geometries, >the simplification could be something we want for some layers
> and not for >others. >A checkbox in the layer properties dialog could be
> interesting. >Then we would have to decide if we want it activated by
> default or not for >dataproviders supporting it. We could have a global
> option for that default >too. >Vincent
> >> >>
> >> >>
> >> >> _______________________________________________
> >> >> Qgis-developer mailing list
> >> >> Qgis-developer at lists.osgeo.org
> >> >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>
> >>
> >>
> >> _______________________________________________
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> >>
> >>
> >
> > _______________________________________________
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> > Qgis-developer at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-developer
>
>
>


-- 
Giovanni Allegri
http://about.me/giovanniallegri
blog: http://blog.spaziogis.it
GEO+ geomatica in Italia http://bit.ly/GEOplus
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