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

[Tim Sutton]

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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