Hi Pierre, > I have been looking at pyrender and did try recently to have a on the > fly vector map rendering in python. It was so slow i decided to use pre > made tiles instead.
Hmm, ok, well that's indicating that we should use C then. > I also used most part of pyroute to try to make off line route > calculation: > > http://sayhoo.garage.maemo.org/ > > It works but it eats too much memory. Thanks, I'll take a look at that - is it because it stores the data in memory rather than using a db? > I also dont know how one could represent big enough a route to connect 2 > foreign city (but, as i do not own a car, this is only a theoretical > problem :-) ) I had been thinking exactly the same thing, how to parse the database and chose the route without needing all of the data in memory/a very long time. Presumably this problem has been solved and there must be papers which explain either how to pare down the data, or how to store memory-efficient route representations. Obviously it could be done by iteratively loading the data for a given area, not sure how much memory would be needed to store the possible routes though as it iterates along the path. Sounds interesting :) Navit is supposed to be able to do general routing (beyond a single city which is stated as a limitation of Pyroute due to memory reqs. see http://almien.co.uk/OSM/Routing/), so looking at/transplanting that code might be a starting point (and it does rendering too). Those graphs on the link above look cool :) Anyway, good to see that there are others interested in the topic :) Cheers, Simon _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
