Thanks a lot Andrea,
Just to clarify....From tomrrow evening the 2.1.x Geoserver will have the
ability to create an inside buffer using the SLD you attatched?
I am using 2.1.2 which is about a month old, and the sld doesn´t buffer the
polygon, which is the reason i´m asking.
<Rule>
<PolygonSymbolizer>
<Fill>
<CssParameter name="fill">#AAAAAA</CssParameter> <!-- THIS FILLS
THE WHOLE POLYGON WITH #AAAAAA-->
</Fill>
<Stroke>
<CssParameter name="stroke">#000000</CssParameter> <!-- THIS
DEFINES THE OUTLINE STROKE OF THE WHOLE POLYGON -->
<CssParameter name="stroke-width">1</CssParameter>
</Stroke>
</PolygonSymbolizer>
<PolygonSymbolizer>
<Geometry>
<ogc:Function name="buffer"> <!-- THIS BUFFERS THE WHOLE POLYGON
WITH A DISTANCE OF 0.5 UNITS INSIDE-->
<ogc:PropertyName>the_geom</ogc:PropertyName>
<ogc:Literal>-0.5</ogc:Literal>
</ogc:Function>
</Geometry>
<Stroke>
<CssParameter name="stroke">#000000</CssParameter> <!-- THIS
STYLES THE STROKE OF THE BUFFER OUTLINE-->
<CssParameter name="stroke-width">3</CssParameter>
</Stroke>
</PolygonSymbolizer>
</Rule>
I assume that the Buffer itself can also be a different color than the whole
polygon fill by adding a fill to the buffer part of the sld.
thanks,
Rob
________________________________
Von: Andrea Aime <[email protected]>
An: Robert Buckley <[email protected]>
Cc: "[email protected]"
<[email protected]>
Gesendet: 11:15 Dienstag, 1.November 2011
Betreff: Re: [Geoserver-users] Buffer function in an sld?
On Tue, Nov 1, 2011 at 8:10 AM, Robert Buckley <[email protected]> wrote:
> Hi,
> I have recently read this pdf explaining the amazing capabilities of slds
> and geoserver styling.
> GeoServer Cartographic Rendering
> - http://2010.foss4g.org/presentations/3588.pdf
> Looking at page 27 - Geometry transformationsm, it seems possible to create
> a buffer in a sld file. How does this work?
The geometry transformations mechanism is described in the user guide:
http://docs.geoserver.org/stable/en/user/styling/sld-extensions/geometry-transformations.html
> I have a situation where I am trying to style a polygon with a thin outline
> approx. 1 px and a relatively thick line - approx.10px which is on the
> inside of the polygon. This is currently not possible with slds because i
> cannot define an offset for the thick line.
> Would I be able to use the sld geometry function to do this for me?
You mean something like in the attached image?
It has been generated using the attached pbuffer.sld
Unfortunately negative buffers were never
tried out before and there was an issue with them:
http://jira.codehaus.org/browse/GEOT-3936
I've just committed a fix, tomorrows nightly build from either trunk
or 2.1.x series
should work:
http://gridlock.opengeo.org/geoserver/
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
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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