Hi, the tiles on disk have a known layout into folders and files, so a mapping from a tile url to files is possible. This means you would not need an http request you would open a disk file. The correspondence from bounding box to tile folder/filename is generally given by a formula. This formula depends on the tile software you have used.
I may help a little more for instance if you are using tilecache or geowebcache. If other just look it up a little on google. I'd also suggest you ask this on http://gis.stackexchange.com/ regards, Joaquim. ----- Original Message ----- From: Chris W <[email protected]> To: [email protected] Cc: Sent: Friday, 20 July 2012, 6:06 Subject: [OpenLayers-Users] Accessing an Offline Tile Store Hello All, I've been looking at the possibility of providing an offline map in a Qt application. The QtWebKit component would be used to host an OpenLayers page inside the application. As a first cut I have implemented a basic local web server to provide XYZ tile service to an OL layer from local mbtiles databases. This all works, and is more disk-space and distribution friendly than using raw tiles on the disk. It has the disadvantage that the desktop app requires a port (multiple ports on terminal server machines) and exposes the tile service to external access (localhost anyway) I had thought of alternate approach that could eliminate the web server. QtWebKit offers a C++ to Javascript bridge that allows js to make calls to C++ functions and vice versa. If the transport for tile requests could be replaced with js calls into the C++ the tile service code could be subsumed into the C++ widget code and no longer be exposed to the outside world. Inspection of the inheritance hierarch of the XYZ layer would seem to indicate an intimate relationship to HTTP... but I am a bit of a js neophyte. I wonder if the replacement of the OL transport layer for base layer tiles retrieval is even possible? Has something like this been done? Regards, Chris _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
