[Qgis-developer] vector rendering improvement patch

[A Huarte]

I think so, the user doesn't notice the simplification or I do not see why I have my glasses dirty :-)

You can see this previous discussion in....

https://github.com/qgis/QGIS/pull/927


regards


>________________________________
> 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 9:33
>Asunto: Re: [Qgis-developer] vector rendering improvement patch
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>2013/10/23 A Huarte <ahuarte47 at yahoo.es>
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>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.
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>>It does not uses the ST_Simplify() method (douglas-peucker algorithm) where the geometry is simplified for other "similar" geometry.
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>Oh, I see. So it's "transparent" to the user, he doesn't notice the simplification, right?
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>>>________________________________
>>> 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
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>>>> 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
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>>>> 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
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>>>>> ________________________________
>>>>> 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
>>>>> >>
>>>>> >>
>>>>> >> _______________________________________________
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>-- 
>Giovanni Allegri
>http://about.me/giovanniallegri
>blog: http://blog.spaziogis.it
>GEO+ geomatica in Italia http://bit.ly/GEOplus
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