Hi,
wanted to check if anyone has feedback on how to express
rendering transformations in CSS, as it's the one functionality
that's still missing from it, compared to SLD.
Say that we start from this SLD as an example:
<FeatureTypeStyle>
<Transformation>
<ogc:Function name="ras:Contour">
<ogc:Function name="parameter">
<ogc:Literal>data</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>levels</ogc:Literal>
<ogc:Literal>1100</ogc:Literal>
<ogc:Literal>1200</ogc:Literal>
<ogc:Literal>1300</ogc:Literal>
<ogc:Literal>1400</ogc:Literal>
<ogc:Literal>1500</ogc:Literal>
<ogc:Literal>1600</ogc:Literal>
<ogc:Literal>1700</ogc:Literal>
<ogc:Literal>1800</ogc:Literal>
</ogc:Function>
</ogc:Function>
</Transformation>
<Rule>
<Name>rule1</Name>
<Title>Contour Line</Title>
<LineSymbolizer>
<Stroke>
<CssParameter name="stroke">#000000</CssParameter>
<CssParameter name="stroke-width">1</CssParameter>
</Stroke>
</LineSymbolizer>
</Rule>
</FeatureTypeStyle>
How to do something equivalent in CSS?
Here is some variants based on the idea that the rt is part of the selector
(the idea
is, that's where we would also specify the target type name, if we wanted
to).
a) 1-1 parallel to the SLD structure
ras:Contour(parameter("data"), parameter("levels", 1100, 1200, 1300, 1400))
{
stroke: black;
}
b) Switch to function with named parameters:
ras:Contour(data, levels : list(1100, 1200, 1300, 1400))) {
stroke: black;
}
c) Function of functions approach, where each param looks like a
sub-function with
its value as its arguments (my favorite due to its conciseness):
ras:Contour(data(), levels(1100, 1200, 1300, 1400))) {
stroke: black;
}
And here is a variant based on the idea that instead the transform is a
parameter, after all, the z-index controlling the creation of new
FeatureTypeStyle
element is there:
* {
-gt-trasform: ras:Contour(data(), levels(1100, 1200, 1300, 1400)));
stroke: black;
}
Can someone think of a more compact or better readable syntax?
Cheers
Andrea
--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
*AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.
-------------------------------------------------------
------------------------------------------------------------------------------
_______________________________________________
GeoTools-Devel mailing list
GeoTools-Devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geotools-devel
