On Mon, Dec 20, 2010 at 10:11 AM, Niels <[email protected]> wrote: > >> There is some truth there but it's not the whole story. >> Yes, that method extract all of the attributes used in the style, whether >> they are used in a filter or in the symbolizers, and to build the bbox >> we would just need the ones used in the symbolizers. >> >> But no, we don't just use the default geometry. I said that in the >> previous mail already, all symbolizers have a<geometry> element >> which can contain a PropertyName to select whatever geometry >> attribute you want out of the feature. >> Using the default geometry is the default behavior, the SLD author >> can however use<xyzSymbolizer><geometry>...</geometry></xyzSymbolizer> >> to specify a certain geometry to be painted, different than the default >> one. >> >> Or, in your case, as a custom extension, apply a funcion on top of it >> to transform it (see >> >> http://blog.geoserver.org/2010/03/17/extending-your-map-styling-with-geometry-transformations/) > > Okay, I see, thanks for clearing that out for me. That still poses a problem > if someone would try to use nested properties in the symbolizers. Perhaps > the algorithm should be changed without changing the aim, instead of looking > for geometry descriptors, get the property names directly from the > symbolizers.
I think we can do that, it's just a matter or writing another style visitor that just extracts the attribute names of the geometries used in the symbolizers. But we need to preserve some level of attribute checking to make sure people get proper errors when asking for attributes that are not there (the hints on the property accessors work for me, provided they do not add significant overhead, the beauty of the code that we have now is that it is performed just once, up front, instead of feature by feature) Cheers Andrea ----------------------------------------------------- Ing. Andrea Aime Senior Software Engineer GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584962313 fax: +39 0584962313 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf ----------------------------------------------------- ------------------------------------------------------------------------------ Lotusphere 2011 Register now for Lotusphere 2011 and learn how to connect the dots, take your collaborative environment to the next level, and enter the era of Social Business. http://p.sf.net/sfu/lotusphere-d2d _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
