[Qgis-user] Selecting displaced symbols

[Neumann, Andreas]

Hi Nyall, 

Can you please estimate the time it takes to finish this old commit? I
think it would be really nice to have in QGIS 3. It always bothered me
(and my users) that we can't click on the displaced symbols. 

How about QGIS server? Could your improvement also benefit QGIS server?
In the Web-GIS it is particularly hard to understand for users, why they
can't pick on displaced symbols. 

Maybe we can find someone to finance this improvement. 

Thanks, 

Andreas 

On 2017-06-01 01:20, Nyall Dawson wrote:

> On 30 May 2017 at 19:11, Neumann, Andreas <a.neumann at carto.net> wrote: 
> 
>> Hi Martin,
>> 
>> As far as I know, picking is totally independent of the rendering. So the
>> "Info tool" doesn't know about the displacement renderer. I know it is not
>> ideal, but it is a technical limitation and there are no known workarounds.
> 
> Well - there's this half finished commit I wrote but never merged:
> https://github.com/nyalldawson/QGIS/commit/2405c9cc2c9d07bd0975d60ce36db5c5e8d8b612
> 
> I can't remember exactly why I didn't complete this. I think it was
> written during feature freeze once and I never got around to verifying
> that it didn't cause regressions in the rendering speed after freeze
> was lifted. From memory it worked well for info tool and rotate point
> symbol tool.
> 
> From the commit message:
> 
> "Register rendered point features into a spatial index so that we can
> later retrieve features by their actual rendered location.
> (The rendered location may be different in numerous circumstances, eg
> when using the displacement renderer, or when marker symbols
> have an offset set)
> This index could then be used to later retrieve the features for a
> specific canvas coordinate, for use eg in identify tool, rotate point
> symbols, etc."
> 
> Theoretically this could be cleaned up, finished off and tested, and
> then later extended to apply to selections also.
> 
> Nyall
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