Thank you David, that was a huge help!
Ok, the part of the documentation I found confusing was in how to actually make
reference to the Hospital mark that the example defined. I could understand
the construction of the symbol but wasn't then sure how to assign it to points.
It would also have helped if there was an explanation of what "usage" was doing.
I have one more question in this area which I can't find any documentation for..
I would like to define a rule which uses an external SVG file as a symbol for a
point. How is this done in CSS? I have tried the following without success:
mark: url(MySymbol.svg);
Where MySymbol.svg is located in the data_dir/styles directory.
Thanks
Chris
From: David Winslow [mailto:[email protected]]
Sent: 06 March 2012 18:06
To: Chris Haste; geoserver-users
Cc: [email protected]
Subject: Re: Geoserver CSS Module
Hi Chris,
I hope it's not a big deal to bring this to the users list; in general I prefer
to answer CSS questions there so Google can help the next person to have your
problem ;)
Yes, the docs are a bit confusing. (It's a common trap for developers - in SLD,
styled marks rely heavily on nested XML structure, so finding a decent way to
encode this in CSS was kind of tricky. Then when I wrote up the documentation
I only gave an example of the most complicated case - using multiple different
symbols with different styling. If you have suggestions on clarifying the
documentation here I would be happy to incorporate some edits.)
Anyway, for basic styled marks, it's fairly straightforward: you can think of
the mark as a new, polygon geometry and use stroke and fill parameters for
that. A rule with ":mark" in its selector will match these synthetic
geometries (":stroke", ":fill", and ":shield" work for geometries generated for
stroke patterns, fill patterns, and label shields respectively, and you can
also use ":symbol" to match any generated symbol.)
You need at least two rules: one to generate this synthetic geometry, and one
to style it (but as a convenience, if you don't style it it will have a
grey/black theme.)
* {
mark: symbol('circle');
}
* :mark {
fill: red;
stroke: black;
}
Or, specifically for the example you gave:
[@scale>34000000][@scale<69000000][longest_runway_ft>8000]{
mark: symbol('circle');
mark-size: 2;
halo-radius: 3;
halo-color: #FFFFFF;
label: [icao_identifier];
label-offset: 0.0 0.0;
label-anchor: 0 0.5;
-gt-label-padding: 20;
-gt-label-priority: [longest_runway_ft];
}
[@scale>34000000][@scale<69000000][longest_runway_ft>8000]
:mark {
fill: #FF0000;
}
--
David Winslow
OpenGeo - http://opengeo.org/
On Tue, Mar 6, 2012 at 6:30 AM, Chris Haste
<[email protected]<mailto:[email protected]>> wrote:
Hi David,
I hope you will forgive the direct email.
I have been evaluating your CSS styling module for Geoserver. I am relatively
new to Geoserver fullstop, but must say that I think the CSS option is a
massive improvement over having to work with SLD, so a big thank you for the
work being done in this area.
My question is probably quite a simple one but for the life of me I cannot find
the answer anywhere!
I wish to use marks on my map (circles) and I wish them to be coloured based on
an attribute of the data. I don't seem to be able to get any colour info to a
symbol using CSS. I looked at the example of a hospital symbol, which would
imply that it can be done, but I couldn't try this as I didn't know how to
reference the 'hospital' as a mark (I tried - mark: symbol('hospital') but that
didn't work).
As an example here is a CSS rule that I am defining:
[@scale>34000000][@scale<69000000][longest_runway_ft>8000]{
mark: symbol('circle');
mark-size: 2;
fill: #FF0000;
halo-radius: 3;
halo-color: #FFFFFF;
label: [icao_identifier];
label-offset: 0.0 0.0;
label-anchor: 0 0.5;
-gt-label-padding: 20;
-gt-label-priority: [longest_runway_ft];
}
The fill:#FF0000; line is where I am expecting it to render red circles, but I
just get grey ones!
I think this problem is a result of what I am doing and not necessarily a bug
etc. so I would appreciate if you could tell me where I'm going wrong?
Many thanks
Chris
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