Re: [QGIS-Developer] QGIS Server 2.x: issue with @map_scale variable vs. $scale

[Andreas Neumann]

Hi Nyall,

Thanks for explaining this. Makes sense and glad that it will be fixed 
in QGIS 3.


So my follow-up question is: can I rely on $scale to work in future 
version of QGIS or will it be deprecated?


Andreas

On 05.07.2017 00:52, Nyall Dawson wrote:

On 4 July 2017 at 01:46, Neumann, Andreas  wrote:

Hi,

In a QGIS project that should be published with QGIS Server, I used the
@map_scale variable to define the font size with an expression, depending on
the map scale. It works fine on QGIS Desktop, but on QGIS server GetMap
requests it fails - the font-size (defined in map units) is constant and
doesn't react to my scale dependent rule. The interesting thing, is, that
the same rule works fine in GetPrint requests.

If I change my rule to use $scale instead of @map_scale, my label rule works
fine.

Could it be that the @map_scale variable doesn't work in QGIS server GetMap
requests?

Exactly - it's a consequence of QGIS 2.x server using the really old
map renderer, which means it doesn't have access to any variables
relating to the current map scale/extent/etc. This is also why 2.5d
renderer is quite broken on server under 2.x.

The good news is that it's all fixed with 3.0.

Nyall




Here is my expression:

CASE
WHEN @map_scale <= 251 THEN 1
WHEN @map_scale > 251 AND @map_scale <= 501 THEN 2
WHEN @map_scale > 501 AND @map_scale <= 1001 THEN 3
WHEN @map_scale > 1001 AND @map_scale <= 2001 THEN 4
WHEN @map_scale > 2001 AND @map_scale <= 3001 THEN 6
WHEN @map_scale > 3001 AND @map_scale <= 4001 THEN 7
WHEN @map_scale > 4001  THEN 8
END

Thanks for your ideas.

Andreas


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Re: [QGIS-Developer] QGIS Server 2.x: issue with @map_scale variable vs. $scale

[Nyall Dawson]

On 4 July 2017 at 01:46, Neumann, Andreas  wrote:
> Hi,
>
> In a QGIS project that should be published with QGIS Server, I used the
> @map_scale variable to define the font size with an expression, depending on
> the map scale. It works fine on QGIS Desktop, but on QGIS server GetMap
> requests it fails - the font-size (defined in map units) is constant and
> doesn't react to my scale dependent rule. The interesting thing, is, that
> the same rule works fine in GetPrint requests.
>
> If I change my rule to use $scale instead of @map_scale, my label rule works
> fine.
>
> Could it be that the @map_scale variable doesn't work in QGIS server GetMap
> requests?

Exactly - it's a consequence of QGIS 2.x server using the really old
map renderer, which means it doesn't have access to any variables
relating to the current map scale/extent/etc. This is also why 2.5d
renderer is quite broken on server under 2.x.

The good news is that it's all fixed with 3.0.

Nyall



>
> Here is my expression:
>
> CASE
>WHEN @map_scale <= 251 THEN 1
>WHEN @map_scale > 251 AND @map_scale <= 501 THEN 2
>WHEN @map_scale > 501 AND @map_scale <= 1001 THEN 3
>WHEN @map_scale > 1001 AND @map_scale <= 2001 THEN 4
>WHEN @map_scale > 2001 AND @map_scale <= 3001 THEN 6
>WHEN @map_scale > 3001 AND @map_scale <= 4001 THEN 7
>WHEN @map_scale > 4001  THEN 8
> END
>
> Thanks for your ideas.
>
> Andreas
>
>
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> QGIS-Developer mailing list
> QGIS-Developer@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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[QGIS-Developer] QGIS Server 2.x: issue with @map_scale variable vs. $scale

[Neumann, Andreas]

Hi, 

In a QGIS project that should be published with QGIS Server, I used the
@map_scale variable to define the font size with an expression,
depending on the map scale. It works fine on QGIS Desktop, but on QGIS
server GetMap requests it fails - the font-size (defined in map units)
is constant and doesn't react to my scale dependent rule. The
interesting thing, is, that the same rule works fine in GetPrint
requests. 

If I change my rule to use $scale instead of @map_scale, my label rule
works fine. 

Could it be that the @map_scale variable doesn't work in QGIS server
GetMap requests? 

Here is my expression: 

CASE
   WHEN @map_scale <= 251 THEN 1
   WHEN @map_scale > 251 AND @map_scale <= 501 THEN 2
   WHEN @map_scale > 501 AND @map_scale <= 1001 THEN 3
   WHEN @map_scale > 1001 AND @map_scale <= 2001 THEN 4
   WHEN @map_scale > 2001 AND @map_scale <= 3001 THEN 6
   WHEN @map_scale > 3001 AND @map_scale <= 4001 THEN 7
   WHEN @map_scale > 4001  THEN 8
END 

Thanks for your ideas. 

Andreas___
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