[Qgis-developer] On the fly simplication of point layers

[A Huarte]

I agree, It is not possible, or very costly, detect if a point has semi transparent symbol
Maybe, new Point layers should have the simplification disabled by default

Alvaro


>________________________________
> De: Tim Sutton <lists at linfiniti.com>
>Para: Mathieu Pellerin <nirvn.asia at gmail.com> 
>CC: QGIS Developer <qgis-developer at lists.osgeo.org>; A Huarte <ahuarte47 at yahoo.es> 
>Enviado: Martes 21 de enero de 2014 6:01
>Asunto: Re: [Qgis-developer] On the fly simplication of point layers
> 
>
>
>Hi
>Sent from my mobile 
>On 21 Jan 2014 3:10 AM, "Mathieu Pellerin" <nirvn.asia at gmail.com> wrote:
>>
>> Also, that logic can only be applied for fully opaque point symbols. As soon as you have a semi transparent symbol, the repetition of points over a same map pixel does matter and needs to be preserved.
>Agreed but in that case surely you would just disable simplification?
>Regards
>
>Tim 
>
>>
>> On 21 Jan 2014 07:46, "A Huarte" <ahuarte47 at yahoo.es> wrote:
>>>
>>> Ok, I will study it
>>>
>>>>
>>>> If you have time and inclination this would be great (note feature freeze starts in 4 days). A logical starting may be to only return one point per map pixel though I am not sure if you can push that kind of logic over to provider side very easily.
>>>>
>>>> Regards
>>>>
>>>> Tim
>>>>  
>>>>>
>>>>>
>>>>>
>>>>>> ________________________________
>>>>>> De: Tim Sutton <lists at linfiniti.com>
>>>>>> Para: A Huarte <ahuarte47 at yahoo.es> 
>>>>>> CC: qgis-developer <qgis-developer at lists.osgeo.org> 
>>>>>> Enviado: Lunes 20 de enero de 2014 22:57
>>>>>> Asunto: Re: [Qgis-developer] On the fly simplication of point layers
>>>>>>
>>>>>> Hi
>>>>>>
>>>>>>
>>>>>> On Mon, Jan 20, 2014 at 11:47 PM, A Huarte <ahuarte47 at yahoo.es> wrote:
>>>>>>>
>>>>>>> done:
>>>>>>> https://github.com/qgis/QGIS/pull/1093
>>>>>>>
>>>>>>> This patch hides the simplification rendering tab for point layers, now it is not supported (internally I am not trying to simplify point layers). Thanks Tim!
>>>>>>>
>>>>>>> About if there is a use case for point simplification, I know one, (gvSIG  + dielmo open lidar) use it for load extreme big point layers as LiDAR LAS files are.
>>>>>>>
>>>>>>> It know the code in java and I think easy migrate to QGIS. Basically, It ignore points by distance in a similar style as the current simplifier classes.
>>>>>>
>>>>>>
>>>>>> Sorry I see my original email was not very clear - I meant if there was a use case for point simplification as *currently implemented in master* - I fully agree that filtering proximal points would be a good performance booster, as would providing a point clustering capability. 
>>>>>>  
>>>>>>>
>>>>>>>
>>>>>>> If you think good for QGIS I think but I can imlement it
>>>>>>
>>>>>>
>>>>>> That would be great! Thanks for your pull request.
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> Tim
>>>>>>  
>>>>>>>
>>>>>>> .
>>>>>>> Alvaro
>>>>>>>
>>>>>>>> ________________________________
>>>>>>>> De: Tim Sutton <lists at linfiniti.com>
>>>>>>>> Para: qgis-developer <qgis-developer at lists.osgeo.org> 
>>>>>>>> Enviado: Lunes 20 de enero de 2014 21:29
>>>>>>>> Asunto: [Qgis-developer] On the fly simplication of point layers
>>>>>>>>
>>>>>>>> Ok I guess you can see where I am going to go with this email :-) Is there any point to allowing users to simplify point layers? Alvaro, can your remove the point rendering tab in layer properties (and I guess check internally that you are not trying to simplify point layers)? Or is there a use case for point simplification that I am not getting?
>>>>>>>>
>>>>>>>> Regards
>>>>>>>>
>>>>>>>> Tim
>>>>>>>>
>>>>>>>> -- 
>>>>>>>> Tim Sutton - QGIS Project Steering Committee Member
>>>>>>>> ==============================================
>>>>>>>> Please do not email me off-list with technical
>>>>>>>> support questions. Using the lists will gain
>>>>>>>> more exposure for your issues and the knowledge
>>>>>>>> surrounding your issue will be shared with all.
>>>>>>>>
>>>>>>>> Irc: timlinux on #qgis at freenode.net
>>>>>>>> ==============================================
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> Qgis-developer mailing list
>>>>>>>> Qgis-developer at lists.osgeo.org
>>>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>>>>>>
>>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> -- 
>>>>>> Tim Sutton - QGIS Project Steering Committee Member
>>>>>> ==============================================
>>>>>> Please do not email me off-list with technical
>>>>>> support questions. Using the lists will gain
>>>>>> more exposure for your issues and the knowledge
>>>>>> surrounding your issue will be shared with all.
>>>>>>
>>>>>> Irc: timlinux on #qgis at freenode.net
>>>>>> ==============================================
>>>>>>
>>>>>>
>>>>
>>>>
>>>>
>>>> -- 
>>>> Tim Sutton - QGIS Project Steering Committee Member
>>>> ==============================================
>>>> Please do not email me off-list with technical
>>>> support questions. Using the lists will gain
>>>> more exposure for your issues and the knowledge
>>>> surrounding your issue will be shared with all.
>>>>
>>>> Irc: timlinux on #qgis at freenode.net
>>>> ==============================================
>>>>
>>>>
>>>
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