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Re: [udig-devel] Arrowhead Symbolizers
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I would ask this on the GEotools-users list or the Geoserver-users. There are lots of SLD experts on both lists.
Jesse
On Tue, Apr 7, 2009 at 11:51 AM, Wellmann, Harald
<harald.wellmann@xxxxxxxxxx> wrote:
How to style line features with an arrowhead at either end? Preferably
using SLD, other methods are welcome if SLD does not support that.
I found this thread on the subject:
http://www.nabble.com/Directional-Symbology-td12231197.html
...but it does fully answer the question.
Given a line feature type with a LineSymbolizer, if I define an
additional PointSymbolizer for that type, where do the point symbols get
placed? At the first vertex, the last, somewhere in the middle of the
line?
Do I have to create an additional point feature just to position the
arrow icon on a line feature?
And of course it is not enough to place an arrowhead icon at the
endpoint of a line, you want the arrowhead to be correctly oriented.
I'm thinking of something like
<sld:LineSymbolizer>
<sld:Stroke>
<sld:CssParameter name="arrow-direction">
<ogc:Literal>backward</ogc:Literal>
</sld:CssParameter>
<sld:CssParameter name="arrow-head">
<ogc:Literal>double</ogc:Literal>
</sld:CssParameter>
</sld:Stroke>
</sld:LineSymbolizer>
where
arrow-direction = none|forward|backward|bothways
arrow-head = simple|double|filled|...
and maybe you want an additional tag for placing the arrows either at
the endpoint of the line or in the middle.
Regards,
Harald
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