Hi,
working on some OSM styling I've found that nowadays OSM uses mostly
SVG based icons.
The icons are "black", but the CartoCSS style associates them with a color,
e.g.:
[feature = 'amenity_biergarten'][zoom >= 17] {
marker-file: url('symbols/biergarten.svg');
marker-fill: @amenity-brown;
marker-placement: interior;
marker-clip: false;
}
So ok, I set up to make an equivalent, by creating a SVG based mark
factory,
work in progress here:
https://github.com/aaime/geotools/commit/697761685e990a85218417d45af2ce3ac11e3648
The extraction of shapes turned out to be not too hard, as I could reuse
work off the
SVGExternalGraphicFactory. The annoying bit is handling the relative paths,
which
is a new concept in WellKnownName.
I looked at a few approaches, including SE 1.1 ExternalMark[1], and
eventually settled
down on adding an explicit file reference, like this:
<Graphic>
<Mark>
* <WellKnownName>file://hospital.svg</WellKnownName>*
<Fill>
<CssParameter name="fill">#FF0000</CssParameter>
</Fill>
</Mark>
<Size>32</Size>
</Graphic>
which, starting from a black, 14x14 SVG symbol, results in a 32x32 red icon:
[image: Inline image 1]
The magic is done, as usual, in SLDParser, and would have to be replicated
in the gt-xsd bindings and
inside GeoServer (the data dir handling code).
How does it look? Good approach? Do you have a better (and feasible ;-) )
one?
Regards,
Andrea Aime
[1] Discarded because we want the entire thing, not a bit inside of a
library, and there is no way to write SE 1.1,
so it would be unusable for CSS/Mapbox/YSLD
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Ing. Andrea Aime
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