On Fri, Apr 24, 2015 at 8:20 PM, Jim Hughes <[email protected]> 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
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