[Qgis-user] data defined style with $scale

[Andreas Neumann]

Hi Stefan,

This seems logical to me. The data-defined styling only changes a 
graphical property. It does not control whether a feature is drawn or 
not. You could set it to fully transparent, but this would still fetch 
features and draw them (though invisible).

If you want to suprress features above a certain level you may do that 
on the layer level in the "General settings" (or something similar).

The labels individually allow to suppress labels based on a column or 
expression, but the data-defined symbology does not allow that so far. 
It would be a new feature to ask for.

Andreas

Am 2013-11-19 07:50, schrieb Ziegler Stefan:
> Hi
> 
> I have a question regarding data defined styling. I'm using the $scale
> parameter to define the line width:
> 
> CASE
> WHEN $scale <= 500.0 THEN 1
> WHEN ($scale > 500 AND $scale <= 1000) THEN 0.5
> END
> 
> I would expect that the line is not drawn with a scale larger than
> 1000. But it seems the line is still drawn. It even draws the line
> with an ELSE-statement:
> 
> CASE
> WHEN $scale <= 500.0 THEN 1
> WHEN ($scale > 500 AND $scale <= 1000) THEN 0.5
> ELSE 0.0
> END
> 
> It seems that I get my expected result when I use an ELSE value near
> zero (e.g. 0.0000001).
> 
> Is this on purpose? Or is there an error in my statement?
> 
> 
> regards
> Stefan
> 
> Freundliche Grüsse
> Stefan Ziegler
> Kantonsgeometer
> 
> Amt für Geoinformation
> Amtliche Vermessung
> Rötistrasse 4
> 4500 Solothurn
> 
> Telefon +41 32 627 75 96
> Telefax +41 32 627 75 98
> stefan.ziegler at bd.so.ch
> http://www.so.ch
> 
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