On Wed, Oct 31, 2012 at 6:29 PM, Martin Davis <[email protected]> wrote:
> I don't know of any way to do this with pure styling.
>
> However, I think it would be possible to create a geometry function
> which would generate the dashed offset lines as a new geometry, which
> could then be styled as needed.  (This is sort of like the offset
> curve function that has already been proposed, but in order to get a
> dash effect which matches on both sides, I think the dashes need to be
> generated explicitly, rather than relying on dashed styling).

Another possible approach would be to create a thick dash, and then
implement some support for composition (Mapnik style) so that another
feature type
can have a "inner line" that punches a central hole in the previously drawn
FTS instead of adding on top of it.

Technically this might be achieved using the DST_OUT AlphaComposition:
http://docs.oracle.com/javase/tutorial/2d/advanced/compositing.html

That said, it would require yet another extension to SLD, deal with it with
the SLD parsers/encoders, modify the renderer to deal with it... but I guess
it would be cool.

Cheers
Andrea

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