Re: [Gwt-openlayers-users] OpenStreetMap in gwt-openlayers

[Edwin C. <com...@gm...>]

Hi Hans,

Did you try the suggestions by Jon Britton? Appararently he got it
working with the latest snapshot (see gwt-ol website for link). I
found an older post by Carsten in the mailing list who got OSM working
as well and gave some example code.

The wrapper code is just a very thin, easy to understand layer (have a
look at some of the Layer classes), so if you know how it works in
Javascript it should be a small step to work out how it works in GWT,
or how it should work in GWT.

If I look at the OpenLayers code for a simple OSM map
(http://openlayers.org/dev/examples/) it should be as easy to add an
OSM layer to the map as:

layer = new OpenLayers.Layer.OSM( "Simple OSM Map");
map.addLayer(layer);

However, if I look at the OSM implementation in GWT-OL it is returning
an OSM layer like this:

return new $wnd.OpenLayers.Layer.OSM.Mapnik(name)

This is a constructor as it appears in
http://www.openstreetmap.org/openlayers/OpenStreetMap.js, which calls
the plain OSM constructor, but adds some extra (perhaps unwanted)
options. It is unclear to me at this point, when to use or when not to
use the 'OpenStreetMap.js' code. This dependency is not in any of the
current OpenLayers examples I could find on
http://openlayers.org/dev/examples/, and I always found it a bit murky
why OSM is hosting their own little library on top of OpenLayers
instead of contributing it to OL core.

The advanced OSM examples of OpenLayers are not even using OSM for the
rasters, but a WMS layer portraying OSM data. Possibly, this is
necessary to do the advanced features, but even if you just want the
OSM layers as background you could consider adding them as WMS layers
as in the Advanced OSM example.

If anybody knows what is the present best way to use OSM with
OpenLayers please let me know. I guess we do not want to break code
that already depends on the existing OSM, but we do want to get
up-to-date.

Greetings,
Edwin Commandeur

2010/5/2 Hans Terje Møller <han...@ho...>:
> Hi.
>
> I worte to you a few weeks ago about using OSM in gwt-openlayers. Do you
> know about someone in your development group that could help me understand
> how to use the OSM class?
> If you do, please send me their e-mail adress.
>
> Thanks in advance!
>
> Regards,
> Hans Terje Møller
>