On Fri, Aug 23, 2013 at 11:52:02AM +0300, Jukka Rahkonen wrote: > You can have several classes in a mapfile and classes can contain several > styles. Layers, classes, and styles can all have scale denominators. > Example showing many classes and styles per one database query > http://latuviitta.org/tyylikirjasto/pg_roadsclose_10k_i.map > This mapfile renders OSM highway layer. Oh, that looks really good. After reading the documentation I thought that you can have only one class per layer.
There's still a tiny bitt missing: I found that you can insert a "!BOX!"[1] in the database query as replacement pattern for the bounding box, but I haven't found anything that you can do the same for the scale denominator. PGMapCSS uses the current scale denominator for zoom level queries and unit conversions. Anyway, I will look into it and try to come up with a suiting MapServer map file (maybe with a fixed scale denominator, so as the result is not zoom level dependend). I guess that the scale denominator could easily be added as replacement pattern to MapServer. > Geoserver supports using SQL queries for selecting data nowadays > http://docs.geoserver.org/stable/en/user/data/database/sqlview.html > The name "sqlview" is misleading. It's the same here, you can't insert BBOX and SCALE_DENOMINATOR in the database query. This is the kind of database query that PGMapCSS likes to use: select * from test_match(pgmapcss_render_context(BBOX, SCALE_DENOMINATOR)); where test_match is a function generated by PGMapCSS which queries all features for the current zoom level from the database, and does all the calculating for the resulting symbols. BBOX and SCALE_DENOMINATOR need to be replaced by the renderer but their current values. > Geoserver implements the SLD standard and filter capabilities can be read > from http://portal.opengeospatial.org/files/?artifact_id=1188 PGMapCSS is not a pre-processor that generates an SLD stylefile from the input style, but processes the input features itself and generates parameters for symbolizers. [1] http://mapserver.org/input/vector/postgis.html Thanks for your input concerning MapServer! greetings, Stephan -- Seid unbequem, seid Sand, nicht Öl im Getriebe der Welt! - Günther Eich ,---------------------------------------------------------------------. | Stephan Bösch-Plepelits, | | Technische Universität Wien - Studien Informatik & Raumplanung | | Projects: | | > openstreetbrowser.org > couchsurfing.org > tubasis.at > bl.mud.at | | Contact: | | > Mail: [email protected] > Blog: plepe.at | | > Twitter: twitter.com/plepe > Jabber: [email protected] | `---------------------------------------------------------------------' _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
