Hi Oliver,
You can make use of a GeoTools filter to retrieve the features that
are within distance d of a given point...
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
GeometryFactory gf = JTSFactoryFinder.getGeometryFactory(null);
FeatureCollection<SimpleFeatureType, SimpleFeature> findFeatures(
FeatureCollection<SimpleFeatureType, SimpleFeature> collection,
DirectPosition2D pos, double maxDistance, String geomAttributeName) {
DirectPosition2D pos = new DirectPosition2D(10.0, 10.0);
Point jtsPoint = gf.createPoint(new Coordinate(pos.x, pos.y));
Filter filter = ff2.dwithin(ff2.property(geomAttributeName),
ff2.literal(jtsPoint), radius, null);
return fc.subCollection(filter);
}
We don't have a FilterLab page yet in the new examples and I'm afraid
the javadocs for the filter classes are not the best. But there is an
example of another, related kind of filter in the SelectionLab
example...
http://geotools.org/examples/selectionlab.html#what-features-did-the-user-click-on
And Jody has just put this FOSS4G tutorial workbook online...
http://snapshots.dist.codehaus.org/geotools/workshop/FilterWorkbook.pdf
Make friends with filters and you can do pretty much anything :)
Michael
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