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- From: Simon Wenner <simon wenner gmail com>
- To: gnome-soc-list gnome org
- Subject: [weekly report] Week 3: local map rendering in libchamplain
- Date: Mon, 15 Jun 2009 16:27:12 +0200
Hi, I spent the first days of the last week improving libmemphis to the state that it can be used in libchamplain. Half a day was lost to trace a nasty segfault, which was hard to reproduce. Tile-rendering for zoom levels 12 to 18 is now stable. I tested lower zoom levels too and they caused minor problems. All ways disappear because of an internal scaling factor of the renderer, which gets below zero for zoom levels smaller than 12. But this can be fixed. I think I will create different scaling factors for the levels 0 to 5, 6 to 11 and 12 to 18. A more severe problem was the acquisition of data for the lower zoom levels. All OSM-API server I know were _very_ slow or down. I had to use a 300MB dump of Switzerland to do my tests, which was painful. I'm thinking about setting up my own server. I could use it for the development of the network map source too. After these tests I created a champlain branch and committed a first prototype of a local map source using libmemphis with a small data set. It worked better than expected. It runs smooth on high-end machines, but the map locks on high zoom levels on weak systems. This week I will evaluate a thread pool for rendering and start to implement the final class hierarchy. I got some feedback from the Memphis developers; they like my changes. I will continue to GObject-ify libmemphis this week. This will improve the performance, as less data has to be copied between old and new data structures. Steps to test the prototype: clone my branch 'local-rendering' from git://gitorious.org/~wenner/libchamplain/wenner-clone.git make; cd demos ./launcher-gtk-local and choose the map source 'OpenStreetMap Memphis' from the drop-down menu. First screen shot: http://foregroundnoise.wordpress.com/2009/06/15/gsoc-week-3/ Overall status: http://foregroundnoise.wordpress.com/gsoc-2009/ git shortlog: Add libmemphis revision 111 to the project. Add libmemphis to the buildsystem Fix coding style champlain-local-map-source prototype added, everything is still hard-coded Add new demo to test the prototype with a small xml dataset improved default rules Add -Werror -pedantic and fixed all warnings Add support for zoom level 18 improve the drawing speed of empty tiles Simon _______________________________________________ gnome-soc-list mailing list gnome-soc-list gnome org http://mail.gnome.org/mailman/listinfo/gnome-soc-list
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