A relative path in a well known name? Is it possible to use external
graphic?
--
Jody Garnett
On 30 July 2017 at 13:17, Andrea Aime <[email protected]> wrote:
> 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/697761685e990a85218
> 417d45af2ce3ac11e3648
>
> 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
> @geowolf
> Technical Lead
>
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>
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