Sounds like a good approach to me. So to clarify, are you planning on
taking the Circle/Arc code from the gml3 module and putting that in the api
module?
On Mon, May 27, 2013 at 3:15 AM, Andrea Aime
<andrea.a...@geo-solutions.it>wrote:
> Hi,
> I am looking into end-to-end support for circular arcs in GeoTools.
>
> The requirement would be to take a circular arc from the data source (SQL
> Server 2012 in this case,
> http://msdn.microsoft.com/en-us/library/ff929141.aspx), and maintain the
> data in its native form until it can be encoded in GML with the proper
> circular arc encoding.
>
> The first thing is being able to parse the circular string from the
> database.
> SQLServer comes with two flavours, WKB and native geometry readers.
> The native geometry reader should be easily fixed, the WKB one instead is
> a bit annoying in that it seems it cannot be subclassed, as it's fully of
> private methods.
>
> For the latter I've cc'ed Martin Davis. Martin, is it ok to make a copy of
> the WKBReader in GeoTools, keeping both the original copyright header and
> the GeoTools one? The license is the same.
> For the future, if all the private methods could be made protected, that
> would allow me to do some cleaner subclassing without having to copy
> everything around (ah mind, I'm still in the evaluate and negotiate phase,
> funding for this is still not secured).
>
> Geometry support wise my current line of thinking would be to create a
> GeoTools specific CircularString class, which extends LineString, and
> actually wraps two things:
> * a org.geotools.gml3.Circle.Arc object, that provides a way to represent
> circular arcs and linearize them, which would be moved to the api module,
> org.geotools.jts.geometry package (more on this later)
> * an optional, created on demand LineString object, to which most of the
> methods would be delegated
> The CircularString would have a configurable linearization tolerance among
> its fields.
>
> This way code that does not know about CircularString could be able to
> just move on and treat the thing as a vanilla LineString (including the map
> rendering code), while code that actually knows what we're talking about
> could extract the Arc and play with it.
>
> As for the position in the api module, the reason is that I'd like to make
> some special case for circle when reprojecting: in WFS we often have to
> just flip coordinates in order to generate the output, while a general
> transformation will stretch the circular arc making it no more one, plain
> axis flipping could be done without breaking its circular nature. And the
> code doing geometry transformations is in that package, hence the need to
> put the CircularString there.
>
> Opinions?
>
> Cheers
> Andrea
>
> --
> ==
> GeoServer training in Milan, 6th & 7th June 2013! Visit
> http://geoserver.geo-solutions.it for more information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
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>
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>
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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