[Qgis-developer] $scale vs. @map_scale variable - Inconsistency between Desktop and Server

[Nyall Dawson]

On 11 Oct 2016 6:12 PM, "Neumann, Andreas" <a.neumann at carto.net> wrote:
>
> Hi Nyall,
>
> Thank you - this explains it. I wasn't aware that QGIS server uses an old
map renderer. I did not even know that different map renderers exist. But
this has nothing to do with the old vs. the new symbology - right? Because
QGIS Server seems to work just fine with the new symbology and labeling.
>
> So much work to do around QGIS 3.x / QGIS Server, etc. ...

Yes, it still uses the pre-multithreaded renderer. There's a work in
progress PR here fixing it:

https://github.com/qgis/QGIS/pull/3129

Nyall

>
> Andreas
>
> On 2016-10-11 10:05, Nyall Dawson wrote:
>>
>>
>>
>> On 11 Oct 2016 5:59 PM, "Neumann, Andreas" <a.neumann at carto.net> wrote:
>> >
>> > Hi,
>> >
>> > I noticed that $scale and @map_scale exist in parallel, but are not
consistently behaving between QGIS Desktop and QGIS server.
>> >
>> > $scale: works fine on both Desktop and Server, but expression preview
in QGIS Desktop fails.
>> >
>> > @map_scale: works fine on QGIS Desktop and also in expression preview,
but fails on QGIS Server.
>>
>> Hi Andreas,
>>
>> Server doesn't have access to any of the map settings related variables,
like the scale, rotation, extent, etc. (This is why 25d ordering is messed
up in server).
>>
>> Server needs to be ported away from the old map renderer before this can
be fixed.
>>
>> Nyall
>> >
>> > Context: expression to calculate letter spacing in a label for
different map scale. Tested on QGIS Master 2.x on Windows 7 64bit.
>> >
>> > Thank you,
>> >
>> > Andreas
>> >
>> >
>> >
>> >
>> >
>> >
>> >
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>
>
>
>
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