Hi,
I have a (I'm quite sure) lame question for using geotools.
I'd like to create, programmatically via the geotools API what would be
eventually serialized as follows:
<gml:Surface>
<gml:patches>
<gml:PolygonPatch>
<gml:exterior>
<gml:Ring>
<gml:curveMember>
<gml:Curve>
<gml:segments>
<gml:GeodesicString>
<gml:posList>47.516389 18.974444
47.515278 19.021667 47.515 19.033056 47.514722 19.043611 47.510556
19.055833 47.506111 19.056944 47.494722 19.06 47.483056 19.029722
47.486111 19.013056 47.491944 18.979444 47.500556 18.97 47.516389
18.974444 </gml:posList>
</gml:GeodesicString>
</gml:segments>
</gml:Curve>
</gml:curveMember>
</gml:Ring>
</gml:exterior>
</gml:PolygonPatch>
</gml:patches>
</gml:Surface>
I'm looking at the various factories, etc. but can't really figure this
out on my own. I see the com.vividsolutions.jts.geom.GeometryFactory
object that has some interesting createXXX() functions, I see the
org.geotools.gml3.Curve class, which expects a
com.vividsolutions.jts.geom.LineString class, I see the
org.opengis.geometry.coordinate.GeometryFactory with the
createGeodesicString() function, etc. I see the
org.opengis.geometry.primitive.Ring object
to start from the inside and work myself towards the outside, first
trying to serialize just the GeodeticString portion, the only place I
found a GeodesicString object was the org.opengis.geometry.coordinate
package. when I tried the following code:
GeometryBuilder builder = new GeometryBuilder(DefaultGeographicCRS.WGS84);
GeometryFactory gf = builder.getGeometryFactory();
List<Position> dps = new ArrayList<Position>();
dps.add(builder.createPoint( new double[] {47.516389, 18.974444}));
dps.add(builder.createPoint( new double[] {47.515278, 19.021667}));
dps.add(builder.createPoint( new double[] {47.516389, 18.974444}));
GeodesicString gs = gf.createGeodesicString(dps);
this fails at the last line with 'not implemented'
if I go with other constructs, like a LineString, it builds OK. but
then, the GML objects' encode() function requires a
SimpleFeatureCollection - I read the XML & Feature tutorials, but it is
unclear to me how I'd but put such a LineString into a
SimpleFeatureCollection.
it's all quite confusing, as these are objects all in separate packages,
etc.
what is the proper way to achieve this when using geotools?
any pointers are welcome.
Akos
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