Mauro Bartolomeoli ha scritto: > We have developed a WFSOutputFormat to write DXF (plain or zipped) in > response to a GetFeature request. > If anyone is interested in it, we would like to commit it as a community > module.
Wow, this looks great, from WebGIS to the most popular CAD system. One question is how this overlaps with the OGR output format, as far as I remember OGR is also able to deal with DXF... or maybe not? http://www.gdal.org/ogr/ogr_formats.html Hmmm... maybe they dropped support for that due to legal issues with OpenDWG. Another thing that comes to mind is Autocad Map, as far as I remember it had some way to attach attributes to the geometries using block attributes or something like that. Is this kind of output envisaged? Just curious. > Some features from the README: > ======================================================== > There have been multiple revisions of the format, so we need to choose a > "version" > of DXF to write. The extension implements version 14, but can be easily > extended > (through SPI providers) to write other versions too. > > Each single query is rendered as a layer. Geometries are encoded as > entities (if simple enough to be expressed by a single DXF geometry > type) or blocks (if complex, such as polygons with holes or collections). > > Some options are available to control the output generated. They are > described in the following paragraphs. > > GET requests format_options > ------------------------------------------------------------------------------ > The following format_options are supported: > 1) version: (number) creates a DXF in the specified version format > 2) asblock: (true/false) if true, all geometries are written as blocks > and then inserted as entities. If false, simple geometries are directly > written as entities. > 3) colors: (comma delimited list of numbers): colors to be used for the > DXF layers, in sequence. If layers are more than the specified colors, they > will be reused many times. A set of default colors is used if the option is > not used. Colors are AutoCad color numbers (7=white, etc.). > 4) ltypes: (comma delimited list of line type descriptors): line types > to be used for the DXF layers, in sequence. If layers are more than > the specified line types, they will be reused many times. If not specified, > all layers will be given a solid, continuous line type. A descriptor > has the following format: <name>!<repeatable pattern>[!<base length>], > where > <name> is the name assigned to the line type, <base length> (optional) > is a real number that tells how long is each part of the line pattern > (defaults to 0.125), and <repeatable pattern> is a visual description > of the repeatable part of the line pattern, as a sequence of - (solid line), > * (dot) and _ (empty space). For example a dash-dot pattern would be > expressed > as --_*_. > 5) layers: (comma delimited list of strings) names to be assigned to > the DXF layers. If specified, must contain a name for each requested > query. By default a standard name will be assigned to layers. > > POST options > ------------------------------------------------------------------------------ > Unfortunately, it's not currently possibile to use format_options in POST > requests. The only thing we chose to implement is the layers options, via > the handle attribute of Query attributes. So, if specified, the layer > of a Query will be named as its handle attribute. > The handle attribute of the GetFeature tag can also be used to override > the name of the file produced. Afaik one can make mixed requests, passing the format options in the URL and the rest of the request in xml format As far as I remember DXF is an open spec and there are no legal issues implementing it in a product, right? If so, +1 for community area. Cheers Andrea -- Andrea Aime OpenGeo - http://opengeo.org Expert service straight from the developers. ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Geoserver-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-devel
