On Fri, Apr 24, 2015 at 8:20 PM, Jim Hughes <jnh5y@anonymised.com> wrote:
2. How does the CSS extension interact with GeoServer's SLD extensions?
It's a translator to SLD, GeoServer and the rendering subsytem really
only handle the latter.
If you are about to ask about working off the CSS directly, It's been
discussed already, having the renderer work directly off the CSS would
require major API changes, and a heavy refactor
or the renderer itself (we'd end up with two renderers to maintain).
I suppose I'm asking how new GeoServer SLD extensions will be added to the
CSS extension. It makes sense that the CSS module may lag behind.
Yes, one has to update the CSSParser and CSSTranslator classes in the
GeoTools gt-css module:
https://github.com/geotools/geotools/tree/master/modules/unsupported/css/src/main/java/org/geotools/styling/css
That said, I believe you're using the wrong syntax, external graphics
locations can only be strings, and the expressions
inside them are parsed at runtime. E.g.:
<ExternalGraphic>
<OnlineResource xlink:type="simple"
xlink:href="http://www.usautoparts.net/bmw/images/states/tn_$\{strToLowerCase\(STATE\_ABBR\)\}\.jpg"
/>
<Format>image/gif</Format>
</ExternalGraphic>
This is because we cannot put a Expression in there (would require an API
change in GeoTools).
So, in CSS the above would look like:
mark: url(
http://www.usautoparts.net/bmw/images/states/tn_$\{strToLowerCase\(STATE\_ABBR\)\}\.jpg
);
and your example would become:
mark: url(${strConcat(strSubstring(EventCode, 0, 2), '.svg')});
Haven't tried it out, but hopefully it will work.... not completely sure
though, I remember at some point we had issues with urls
that were pure expressions (e.g., not starting with a static string portion
like my former example).
Cheers
Andrea
--
GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
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Italy
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