Hi I just tried a line-width "0" and it is rendered (no data defined stuff, only simple styling).
Regards Stefan > -----Ursprüngliche Nachricht----- > Von: Andreas Neumann [mailto:[email protected]] > Gesendet: Dienstag, 19. November 2013 14:15 > An: Ziegler Stefan > Cc: [email protected] > Betreff: Re: [Qgis-user] data defined style with $scale > > Hi, > > If a line-width with "0" is rendered than it is a rendering issue and not a > logical issue. > > The CASE WHEN ELSE END statement always returns a value. That's what I meant > that > it seems logical to me. > > I don't think that QGIS does suppress the rendering of lines with zero width. > It just > passes it on to the render with a line-width value of zero. If the renderer > still draws > the line it is a bug in the renderer. > > Of course could check if the line-width is zero and suppress the line. > But I don't know much about the renderer internals to know how QGIS is > handling it. > > Andreas > > Am 2013-11-19 13:16, schrieb Ziegler Stefan: > > Hi Andreas > > > > for me it seems unlogical. The CASE-WHEN-ELSE statement is returning > > zero for scales larger than 1000. So I don't see any reason why QGIS > > draws a line with an unpredictable line-width. > > > > I do not have access at the very moment to QGIS. But what happens when > > you just enter 0.0 as data defined line-width? > > > > regards > > Stefan > > > > Von meinem iPad gesendet > > > >> Am 19.11.2013 um 11:59 schrieb "Andreas Neumann" > >> <[email protected]>: > >> > >> 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 > >>> [email protected] > >>> http://www.so.ch > >>> _______________________________________________ > >>> Qgis-user mailing list > >>> [email protected] > >>> http://lists.osgeo.org/mailman/listinfo/qgis-user > >> _______________________________________________ > >> Qgis-user mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
