On Friday, February 19, 2010, Christopher Schmidt <crschm...@metacarta.com> wrote: > On Thu, Feb 18, 2010 at 11:25:39PM +0100, Andreas Hocevar wrote: >> Phil Scadden wrote: >> > I am wanting to change the SRS of map "on the fly", (largely dependent >> > on what imagery is selected am using as a backdrop). Can you just change >> > it for an existing map or do you have to destroy the map and recreate >> > with a the new srs? >> >> If your backdrop is a base layer, and configured with the right srs, the >> map will automatically switch to the srs that is configured for the base >> layer. > > Sort of. Vectors loaded statically won't reproject.
+ I think one needs to reconfigure the overlays, i.e. set the projection, recalculate min/maxResolution, etc. We, at Camptocamp, have been working on a SelectZone control. This control allows switching to a new geographic zone, with a new projection, max extent etc. Switching zone can be done manually using control.select(newzone) or automatically on zoom in/out. See the example <http://trac.openlayers.org/browser/sandbox/elemoine/reproject/examples/reproject-map.html>. The example includes the code of the Control. This control relies on three OpenLayers patches, see #2360, #2427, and #2359. I think these patches could be useful for other "reproject map" implementations than our SelectZone control. Also, note that the control doesn't currently support reprojecting vectors, but adding that shoudn't be a problem. And FYI we've been thinking about making the SelectZone an OpenLayers addin, but we haven't gotten to that at this point. Cheers, -- Eric Lemoine Camptocamp France SAS Savoie Technolac, BP 352 73377 Le Bourget du Lac, Cedex Tel : 00 33 4 79 44 44 96 Mail : eric.lemo...@camptocamp.com http://www.camptocamp.com _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
