[Qgis-developer] scale dependent visibility and fixed scales

[Larry Shaffer]

On Thu, Aug 16, 2012 at 5:33 PM, Larry Shaffer <larrys at dakotacarto.com> wrote:
> Hi,
>
> On Thu, Aug 16, 2012 at 7:40 AM, kimaidou <kimaidou at gmail.com> wrote:
>> Hi all
>>
>> I totally agree scale limits should be included. I usually need to set 51000
>> or 49999 so that exact 50k is taken into account for respective max / min
>> scales.
>> Including the bounds will be more logic in my opinion.
>
> I concur. Do you mean like this:
>
> http://dl.dropbox.com/u/4058089/qgis/scale-boundaries-included_patch.diff
>
> Those were the first two I could find, there are probably others.

On second look, QgsRuleBasedRendererV2::Rule::isScaleOK looks like
it's already including the boundaries. (removed it from the diff)

> I believe this is how the PAL labeling engine [0] already handles
> this, and it's how my recent data defined scale-visibility for labels
> works [1].
>
> [0] https://github.com/qgis/Quantum-GIS/blob/master/src/core/pal/layer.cpp#L132
> [1] https://github.com/qgis/Quantum-GIS/blob/master/src/core/qgspallabeling.cpp#L516
>
> Regards,
>
> Larry
>
>> Cheers
>> Michael
>>
>> 2012/8/16 Marco Bernasocchi <marco at bernawebdesign.ch>
>>>
>>> Hi all, today I was plaing around with some swiss maps (LK25 and LK50) I
>>> wanted to have LK50 (national map 1:50000) visible only from scale
>>> 1:50000 and if it is zoomed in then I want to see LK25.
>>>
>>> So I set the maps to be scale dependent visible as here:
>>> LK25 min:0 Max 50000
>>> LK50 min: 50000 Max 1000000000
>>>
>>> the concept works but there is a detail (matter of changing a < to <= or
>>> so) that I think it is not super intuitive.
>>> If I select the fixed scale of 1:50000 then onlx LK25 is shown. I would
>>> expect either both or only LK50 to be visible.
>>> what do think?
>>>
>>> ciao
>>> --
>>> Marco Bernasocchi
>>> http://opengis.ch
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>
>>
>>
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