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 retrieve
the feature's info else retrieve informations about the nearest feature.
I resolved using the GeometryDistanceFilter.
Code:
FeatureSource source = null;
FeatureCollection collection = null;
Coordinate coord = new Coordinate(X,Y);
FilterFactory filterFactory = FilterFactoryFinder.createFilterFactory();
GeometryFactory fact = new GeometryFactory();
GeometryDistanceFilter distanceFilter =
filterFactory.createGeometryDistanceFilter(FilterType.GEOMETRY_DWITHIN);
distanceFilter.setDistance(10.0);
Point point = fact.createPoint(coord);
distanceFilter.addLeftGeometry(filterFactory.createLiteralExpression(point));
try{
source=wfs.getFeatureSource(pointQueryTool.getFeatureType().getName());
collection = source.getFeatures(distanceFilter);
}catch(IOException e){
source=null;
}
Cheers
Jacopo Boari
Sysgroup srl - Lungo Dora Colletta 113/14 - 10153 Torino
tel 0112440983 fax 0112406561
e-mail [EMAIL PROTECTED] www.sysgroup.it
-----Messaggio originale-----
Da: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Per conto di Jacopo Boari
Inviato: giovedì 4 gennaio 2007 19.04
A: 'Manuele Ventoruzzo'; '[email protected]'
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
Jacopo Boari
Sysgroup srl - Lungo Dora Colletta 113/14 - 10153 Torino
tel 0112440983 fax 0112406561
e-mail [EMAIL PROTECTED] www.sysgroup.it
________________________________
Da: Manuele Ventoruzzo [mailto:[EMAIL PROTECTED]
Inviato: giovedì 28 dicembre 2006 17.11
A: Jacopo Boari
Cc: '[email protected]'
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 reference
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 = FilterFactoryFinder.createFilterFactory();
GeometryFactory fact = new GeometryFactory();
Expression point = ff.createLiteralExpression(fact.createPoint(coord));
GeometryFilter gf = ff.createGeometryFilter(FilterType.GEOMETRY_WITHIN);
gf.addLeftGeometry(point);
FeatureSource fs = getFeatureSource(...);
FeatureCollection result = 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:
Hi all,
After a click action on the map, I obtain the point's coordinates (X,Y).
How can I obtain the feature at this coordinates?
There's some filter that can I use?
Best Regards...
Jacopo Boari
Sysgroup srl - Lungo Dora Colletta 113/14 - 10153 Torino
tel 0112440983 fax 0112406561
e-mail [EMAIL PROTECTED] www.sysgroup.it
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