Hi Kevin, On 9 Jul 2008, at 18:01, Kevin Webb wrote:
> Hi, > > I'm interested to know if anyone has developed an approach with Mapnik > to draw layers manually (i.e. using graphics primitives directly) > rather than going through the existing symbolizers. My interests is to > take a map (via a shapefile, or postgis data source) and overlay > structural, in my case non-cartographic/topological, data over top of > it using the coordinate space from the map. I've devised a way to do > this by inserting my markup into a postgis datasource and then > rendering that as a layer. It works but is a bit clunky and doesn't > allow for easy programmatic control of the drawing - it also makes > certain kinds of drawing operations very challenging. In my case I am > drawing arc segments between points with arrowhead caps. > You can try using something like pycairo to draw on top of map. > Ideally the next step would be to expose a layer with graphics > primitives through the API (in my case Python). I've looked at the > source already and don't see anything heading in this direction, > however, I'm curious if this is something that people have played > with? I'm going to start hacking on the current 0.51 source to see > investigate the feasibility of this change but would love any guidance > that others may have. Yes, I can see this can be useful. What kind of API are you envisaging ? > Thanks, > Kevin Cheers Artem > > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users > _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
