On Wed, 1 Sep 2010, Ian Dees wrote:
My update does check the available CRS from GetCapabilities for each layer
and will flag a layer as unusable if it doesn't match the current projection
set in JOSM's preferences.
I like your idea better, though: prompt the user to change the projection so
that it matches the projection of the selected layer(s). Right now it would
only support switching to 4326 I suppose, but in the future it could switch
to other JOSM-supported projections. Is there a preferred method to call to
set projection (so that the GUI is updated after the change)?
Just have a look in the preferences. It already calls the correct function
somewhere in main or MapView. Maybe a trySetProjection(String code, bool ask)
method would better be placed in core (getting projection and asking user
to switch when requested). Patches welcome.
Getting projections is mainly asking all projections if they know the code
(getPreferencesFromCode() or toCode() for these who don't have prefs).
Also WMS layers already get informed about projection changes. Currently
they ignore it. Here some action would be required:
- ask and remove layer if projection can't be used
- switch to projection for layer when possible.
Ciao
--
http://www.dstoecker.eu/ (PGP key available)
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