The CSS module is incomplete and misses a few "corners" of the SLD
specification - units of measure is one of them. So, it's not possible to
use units of measure in GeoServer CSS right now.
I am definitely interested in having them, but there are a couple of issues
to consider first:
- the most natural notation in CSS for adding unit notation is to suffix
the units to the value: 1px, 4.5ft, 10m, but in GeoServer CSS we also have
CQL expressions. Does "[width_in_meters]m" still make sense? What other
notation might be better?
- Also, in SLD units of measure are per-symbolizer, while CSS-like
notation puts them on the properties. While probably most real-world use
cases won't mix feet and meters, it would be nice to support this since the
syntax sort of suggests it.
- SLD only supports px, m, and ft. Should CSS add a broader collection
of units?
This is just a spare-hours project for me and I am working on some
performance stuff now[1]. I might eventually find some time to think about
the issues with UOM and resolve them but it's not likely to be soon.
[1]: More on my current work here:
https://groups.google.com/d/topic/geoscript/UXo_XFiM00I/discussion
--
David Winslow
OpenGeo - http://opengeo.org/
On Thu, Mar 22, 2012 at 7:01 AM, Chris Haste <cha...@airdata.co.uk> wrote:
> Hello list!****
>
> ** **
>
> I have two questions in relation to the CSS module.****
>
> ** **
>
> Firstly, using units of measurement. Could someone supply an example of
> the syntax for this? I have tried:****
>
> mark: symbol('circle');****
>
> mark-size: 10000m;****
>
> also****
>
> mark-size:10000 m;****
>
> But neither seem to work. The first results in nothing getting drawn and
> the second results in the mark being drawn at 10000 pixels!****
>
> ** **
>
> Secondly, if I want to use an external symbol (e.g. a PNG or SVG file) and
> have this scaled using UoM what size/scale does the image have to be
> created at in order for it to scale correctly?****
>
> ** **
>
> Thanks****
>
> ** **
>
> Chris****
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