I think the hint applies to the ISO Geometry classes.
Yep that is what the javadocs say:
/**
* The {@link org.opengis.referencing.crs.CoordinateReferenceSystem} to use in
* ISO geometry factories.
*
* @see #JTS_SRID
* @since 2.5
*/
public static final Key CRS = new
Key("org.opengis.referencing.crs.CoordinateReferenceSystem");
The JTSFactoryFinder does list the respected hints:
/**
* Returns the first implementation of {@link GeometryFactory} matching the
specified hints.
* If no implementation matches, a new one is created if possible or an
exception is thrown
* otherwise.
* <p>
* Hints that may be understood includes
* {@link Hints#JTS_COORDINATE_SEQUENCE_FACTORY
JTS_COORDINATE_SEQUENCE_FACTORY},
* {@link Hints#JTS_PRECISION_MODEL JTS_PRECISION_MODEL} and
* {@link Hints#JTS_SRID JTS_SRID}.
*
* @param hints An optional map of hints, or {@code null} if none.
* @return The first geometry factory that matches the supplied hints.
* @throws FactoryRegistryException if no implementation was found or can be
created for the
* {@link GeometryFactory} category and the given hints.
*/
For background:
- http://docs.geotools.org/latest/userguide/guide/library/jts/geometry.html
- http://docs.geotools.org/latest/userguide/guide/library/opengis/geometry.html
Still the idea of asking the JTSFactoryFinder to respect the hint is
interesting; however we do not provide the GeometryFactory class ourselves (so
we cannot modify it to accept a default user data value).
--
Jody Garnett
On Thursday, 31 March 2011 at 11:22 AM, Oleksandr Huziy wrote:
> Hello,
>
> I solved the problem with null crs of the feature adding 1 line
>
> Hints hints = new Hints();
> hints.put(Hints.CRS, re.getCoordinateReferenceSystem());
> geometryFactory = JTSFactoryFinder.getGeometryFactory(hints);
> simpleFeatureTypeBuilder.add("geometry", Polygon.class);
> simpleFeatureTypeBuilder.setCRS(re.getCoordinateReferenceSystem());
> simpleFeatureTypeBuilder.setName("polygon");
> SimpleFeatureType type = simpleFeatureTypeBuilder.buildFeatureType();
>
> type = DataUtilities.createSubType(type, null, DefaultGeographicCRS.WGS84);
>
> then created the feature as earlier. So now the purpose of hints is not clear.
>
>
> --
> Oleksandr Huziy
>
> 2011/3/30 Oleksandr Huziy <[email protected]>
> > Hello again,
> >
> > another method I am trying to use to create a polygon is:
> >
> > Hints hints = new Hints();
> > hints.put(Hints.CRS, DefaultGeographicCRS.WGS84);
> > geometryFactory = JTSFactoryFinder.getGeometryFactory(hints);
> > simpleFeatureTypeBuilder.add("geometry", Polygon.class);
> > simpleFeatureTypeBuilder.setName("polygon");
> > SimpleFeatureType type = simpleFeatureTypeBuilder.buildFeatureType();
> >
> > Coordinate[] coords = new Coordinate[5];
> > double x0, y0, dx, dy;
> > x0 = re.getMinX();
> > y0 = re.getMinY();
> > dx = re.getWidth();
> > dy = re.getHeight();
> >
> > coords[0] = new Coordinate(x0, y0);
> > coords[1] = new Coordinate(x0, y0 + dy);
> > coords[2] = new Coordinate(x0 + dx, y0 + dy);
> > coords[3] = new Coordinate(x0 + dx, y0);
> > coords[4] = coords[0];
> >
> >
> > Polygon polygon =
> > geometryFactory.createPolygon(geometryFactory.createLinearRing(coords),
> > null);
> > SimpleFeature feature = SimpleFeatureBuilder.build( type, new Object[]{
> > polygon }, null);
> >
> >
> > but when I try to access crs of the feature it gives me null (i.e.
> > feature.getFeatureType().getCoordinateReferenceSystem()),
> > and as a consequence I get the following error while trying to draw it:
> >
> > Mar 30, 2011 2:08:16 PM org.geotools.map.MapContext getLayerBounds
> > SEVERE: It was not possible to get a projected bounds estimate
> >
> > But it is drawn ok.
> >
> > And while we are at this, how can I specify bounds of MapContext in
> > coordinates, for example, if I want it to have an extent
> > -180, 180; -90, 90 ?
> >
> > thank you very much
> > --
> > Oleksandr Huziy
> >
> >
> >
> >
> >
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