Re: [Geotools-gt2-users] Cannot display a GridCoverage2D

[Alessio F. <ale...@gm...>]

To render a GridCoverage you have to put a RasterSymbolizer in your Style
otherwise the Renderer will not recognize it. Moreover you have to use a
renderer (StreamingRenderer for instance) to paint the coverage (or feature=
)
into the graphic object.

Alessio.


On 4/30/06, malesch <ma...@gm...> wrote:
>
> Hello GeoTools-Users
>
> I have a quite simple beginners problem.
>
> I create a GridCoverage2D object by accessing my GeoServer
> running locally. The created Coverage actually contains something
> useful, as I can see by calling the show()-method on it.
>
> I now want to add some feature and so I add it to a mapContext
> and display it using a StyledMapPane:
>
>
> -------------------------------------------------------------------------=
--------------------
> [...]
> gc.show();  // -> displays me the accessed geometries from GeoServer! :)
>
> StyleBuilder styleBuilder =3D new StyleBuilder();
> Style gcStyle =3D new BasicLineStyle(styleBuilder.createStroke(Color.BLAC=
K
> ));
> MapContext mapContext =3D new DefaultMapContext();
> mapContext.addLayer(gc, gcStyle);
>
> final StyledMapPane mapPane =3D new StyledMapPane();
> mapPane.setMapContext(context);
> mapPane.setPaintingWhileAdjusting(false);
> mapPane.getRenderer().addLayer(new RenderedMapScale());
>
> final JFrame frame =3D new JFrame(context.getTitle());
> frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
> final Container container =3D frame.getContentPane();
> container.setLayout(new BorderLayout());
> container.add(mapPane.createScrollPane(), BorderLayout.CENTER);
> container.add(new StatusBar(mapPane), BorderLayout.SOUTH);
> frame.pack();
> frame.show();
>
> -------------------------------------------------------------------------=
--------------------
>
> What I get finally is the displayed envelope (with the legend) where I
> can pan, zoom and so on, but with an empty canvas...I see simpy
> no geometries!
>
> Am I doing something wrong with the styles? Its strange that I can displa=
y
> the geometries of the GridCoverage (show()) but am not able to display
> them in the MapContext.
>
> Thanks for any tipps or code snippets!
>
> PS: I can access maps and features using udig without any problem, just
> to be sure, things are alright with the data sources.
>
>
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>



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Alessio Fabiani
Software Engineer

http://afabiani.wordpress.com

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