1. White line in the middle won't do - the symbol has to be hollow in the
middle.

2. That's very very sad. Maybe there is a workaround with geometry
functions?
There is a "drop shadow" example where geometry is offset from the original.
So can I just offset a river and put a TextSymbolizer with followline in it?

2011/3/30 Andrea Aime <[email protected]>

> On Wed, Mar 30, 2011 at 6:18 PM, Gis Mage <[email protected]> wrote:
> > Hello!
> >
> > I'm doing a pretty strict cartographic map.
> > 1. How can I create a LineSymbolizer, which will produce two parallel
> dash
> > lines with 1 px hollow in between?
> > Like two same lines with positive and negative offset from centerline by
> > 1px.
>
> You create one large dashed line, black, and a white line in the middle
> (assuming the background is white).
>
> As far as I know it's the only way to get good looking results.
> Or you can use a graphics stroke with the base symbol you want and combine
> it with dash array, GS 2.1.x will repeat the symbol following the dash
> array
> as a template.
>
> > 2. How can I create a TextSymbolizer, which will follow the line and will
> > have an offset (be above the line at 2px)?
>
> Not possible, we don't have the code that computes a proper offset line.
> I tried to implement it but it was quite hard, also the JTS main developer
> agreed with me that a single side offset with proper bending in the curves
> is very hard to implement, not something that can be done in hours
> (I actually already threw days at the problem without luck, thought I'm
> sure
> Martin Davis, the father of JTS, would be able to do it properly)
>
> Cheers
> Andrea
>
>
> --
> -------------------------------------------------------
> Ing. Andrea Aime
> GeoSolutions S.A.S.
> Tech lead
>
> Via Poggio alle Viti 1187
> 55054  Massarosa (LU)
> Italy
>
> phone: +39 0584 962313
> fax:      +39 0584 962313
> mob:    +39 333 8128928
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.youtube.com/user/GeoSolutionsIT
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
> -------------------------------------------------------
>
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