Re: [Geotools-gt2-users] Creating co-ordinate system for OSGB36

[Martin D. <mar...@te...>]

Dale Peakall a =E9crit :
> println to the rescue!
>=20
> I'm finally making progress.  The problem appears to be that when
> I call setContext() on the StyledMapPane to add my data, the=20
> CoordinateSystem I installed is overwritten with WGS84.

Right. The 'setContext(...)' method set the renderer's CS to the=20
BoundingBox's CS (not sure if it was the best idea, any feedback is=20
welcome), and the default BoundingBox's CS is WGS84.


   I've
> searched the API docs surrounding Context, and the only thing that
> seems to process a co-ordinate system is a BoundingBox, but these
> methods take an org.opengis.cs.CS_CoordinateSystem not an
> org.geotools.cs.CoordinateSystem and I have no idea about how to
> convert between these - or why the BoundingBox needs a coord
> system for that matter.

Conversion from CoordinateSystem implementation to CS_CoordinateSystem=20
interface is done as below (using org.geotools.ct.Adapters):

  CS_CoordinateSystem ogcCS =3D Adapters.getDefault().export(cs);


NOTES: - Those interfaces (org.opengis.cs.CS_CoordinateSystem) are going
          to change!! This is the purpose of the GeoAPI project.

        - OpenGIS requires that CS interface are RMI aware. Consequently,
          Adapters.export(...) wrap Geotool's implementation into a
          RMI-aware OpenGIS interface. One consequence of that is that
          it may open a socket connection for use with a RMI server.
          We wish to revisit this issue in the GeoAPI project.

We will try to get ride of Adapters in a future version (Geotools=20
implementation should extends interfaces directly).




> Here's the code I'm using to create the context.
>=20
> // create the context
> Context createContext(FeatureCollection features)
> {
>   final ContextFactory factory =3D ContextFactory.createFactory();
>   final Context context =3D factory.createContext();
>   final Layer layer =3D factory.createLayer(features, style);
>   layer.setTitle("Boundary Line Data");
>   context.getLayerList().addLayer(layer);
>   context.getBoundingBox().setAreaOfInterest(features.getBounds());
>   context.setTitle("GT2BLineDataSourceTest");
>   return context;
> }

Just add yours CS in the 'setAreaOfInterest' method call.

	Regards,

		Martin.