[Geotools-gt2-users] R: R: Obtain feature by X,Y point

[Jacopo B. <jac...@sy...>]

Hi list,

I'm sorry for the bad explication of the question, what I want to di is:
Click on the map, if at these coordinates there's a feature, I want to retr=
ieve the feature's info else retrieve informations about the nearest featur=
e.

I resolved using the GeometryDistanceFilter.

Code:

FeatureSource source =3D null;
FeatureCollection collection =3D null;
Coordinate coord =3D new Coordinate(X,Y);

FilterFactory filterFactory =3D FilterFactoryFinder.createFilterFactory();
GeometryFactory fact =3D new GeometryFactory();
GeometryDistanceFilter distanceFilter =3D filterFactory.createGeometryDista=
nceFilter(FilterType.GEOMETRY_DWITHIN);
distanceFilter.setDistance(10.0);
Point point =3D fact.createPoint(coord);
distanceFilter.addLeftGeometry(filterFactory.createLiteralExpression(point)=
);
try{
=09source=3Dwfs.getFeatureSource(pointQueryTool.getFeatureType().getName())=
;
=09collection =3D source.getFeatures(distanceFilter);
}catch(IOException e){
=09source=3Dnull;
}

Cheers


Jacopo Boari                                                              =
=20
Sysgroup srl - Lungo Dora Colletta 113/14 - 10153 Torino
tel 0112440983   fax 0112406561  =20
e-mail jac...@sy...           www.sysgroup.it

-----Messaggio originale-----
Da: geo...@li... [mailto:geotools-gt2-u=
ser...@li...] Per conto di Jacopo Boari
Inviato: gioved=EC 4 gennaio 2007 19.04
A: 'Manuele Ventoruzzo'; 'geo...@li...'
Oggetto: [Geotools-gt2-users] R: Obtain feature by X,Y point


How can I find the features in he area near the clickPoint?

Thanks in advance.
Best regards
=20
Jacopo Boari                                                              =
=20
Sysgroup srl - Lungo Dora Colletta 113/14 - 10153 Torino
tel 0112440983   fax 0112406561  =20
e-mail jac...@sy...           www.sysgroup.it
=20

________________________________

Da: Manuele Ventoruzzo [mailto:man...@ov...]
Inviato: gioved=EC 28 dicembre 2006 17.11
A: Jacopo Boari
Cc: 'geo...@li...'
Oggetto: Re: [Geotools-gt2-users] Obtain feature by X,Y point


Of course.

First of all, you have to convert point's coordinate in a coordinate refere=
nce system used for map rendering (such as WGS:84).
To do this, you have to use an affine transformation.

Then, you can select feature that contains such point.

For example:

FilterFactory ff =3D FilterFactoryFinder.createFilterFactory();
GeometryFactory fact =3D new GeometryFactory();
Expression point =3D ff.createLiteralExpression(fact.createPoint(coord));
GeometryFilter gf =3D ff.createGeometryFilter(FilterType.GEOMETRY_WITHIN);
gf.addLeftGeometry(point);
FeatureSource fs =3D getFeatureSource(...);
FeatureCollection result =3D fs.getFeatures(gf);

Where coord is a Coordinate object.

Finally, result contains every feature that matches your condition.

Bye,
Manuele.

in data 28/12/2006 16.46 Jacopo Boari ha detto:=20

=09Hi all,
=09
=09After a click action on the map, I obtain the point's coordinates (X,Y).
=09
=09How can I obtain the feature at this coordinates?
=09There's some filter that can I use?
=09
=09Best Regards...
=09
=09
=09Jacopo Boari                                                            =
  =20
=09Sysgroup srl - Lungo Dora Colletta 113/14 - 10153 Torino
=09tel 0112440983   fax 0112406561  =20
=09e-mail jac...@sy...           www.sysgroup.it
=09
=09
=09------------------------------------------------------------------------=
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=09https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
=09 =20



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