Hi Martin,
Thank you for the explanation. I believe that a) option is more natural
to users. But of course we would also need a way to later change the
order of the rules - once they are created.
For now I am just using additional layers until the rule-based renderer
behaves like a) or SLD.
Thanks,
Andreas
On Fri, 8 Apr 2011 12:25:03 +0200, Martin Dobias wrote:
On Fri, Apr 8, 2011 at 11:36 AM, Andreas Neumann
<a.neum...@carto.net> wrote:
Hi,
I am trying to better understand the rule based renderer.
Which version is correct?
a) QGIS is rendering all features of the first rule, then the second
rule,
etc, Features of the first rule are rendered first, features of the
second
rule on top of features from the first rule
b) QGIS is rendering each feature on by one and decides which rule
applies.
I hope it is not version b), I hoped it behaves like version a) but
it
behaves a bit odd with my data. For my data it seems like the order
of the
rule has no influence on the rendering order ;-(
Hi Andreas
the rule based renderer uses the b) option: it goes through the
features one by one and applies all matching rules (in the order in
which they appear). Mayeul Kaufmann has done some work in order to
support option a) by implementing support for symbol levels so that
the rendering order can be overridden.
My ultimate goal is to only support the option a) in a way how SLD
specifies it: rules are grouped and these groups are rendered one
after each other.
Regards
Martin
--
--
Andreas Neumann
Böschacherstrasse 10A
8624 Grüt (Gossau ZH)
Switzerland
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