On Thu, Feb 23, 2017 at 7:19 PM, Martin Davis <[email protected]> wrote:
> As I understand it, the recommended approach for producing "cased" lines
> (e.g. for roads or polygon outlines) is to specify each different line
> style in a separate FeatureTypeStyle.
>
> However, this seems to produce Legend graphics with the different line
> styles on separate lines. (See attached map tile and legend).
>
> Is this a known issue? Any workaround or fix?
>
Well know issue. Fix is not trivial (not at all), but I have something in
mind.
So, the two feature type styles are painted separately, and might be
completely unrelated... like, for example, two feature type styles
could be used to z order features that should appear in the back and in the
front.
So one would have to compare rules in higher FTS with the lower ones, and
if they are a match, merge the
symbolizer from the higher FTS with the lower rules, making the higher fts
rule disappear.
Basically, restructure the SLD so that you end up with a single FTS.
The tricky part is defining what a "match" is. In general, it's taking the
filters of the two rules, combining them,
and determining that they are not "logically empty". The
SimplifyingFilterVisitor has some symbolic evaluation
capabilities, but they are limited and sometimes expensive.
I think you can imagine how this can easily spiral out of control with very
complex styles (having many FTS layers).
Still, I'd give it a try, maybe trying to constrain the application of this
logic to some "sane-ish" simpler case.
Cheers
Andrea
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