Re: [udig-devel] Setting a CRS for a layer or for the whole map

[Mauricio Pazos <mauricio.pazos@xxxxxxxxx>]

On Friday, June 15, 2012 05:16:31 AM George Schole wrote:

> By the way how can i progamatically change the projection of  a map?

You could use the ChangeCRSCommand

...

getMap().sendCommandSync(new ChangeCRSCommand(result));

...

> Or

> change the projection ofa layer if the first is not possible

To reproyect a layer you should transform each geometry. I have extracted the following idea from http://docs.geotools.org/stable/userguide/examples/crslab.html#exporting-reprojected-data-to-a-shapefile

 

 

SimpleFeatureIterator iterator = featureCollection.features();

        try {

            while( iterator.hasNext() ){

                // copy the contents of each feature and transform the geometry

                SimpleFeature feature = iterator.next();

                SimpleFeature copy = writer.next();

                copy.setAttributes( feature.getAttributes() );

                Geometry geometry = (Geometry) feature.getDefaultGeometry();

                Geometry geometry2 = JTS.transform(geometry, transform);

                copy.setDefaultGeometry( geometry2 );                

                writer.write();

            }

            transaction.commit();

 

>

> Thanks

 

cheers

--

Mauricio Pazos