You could do something like this:
public List<SimpleFeature> search(Point p) {
List<SimpleFeature> ret = new ArrayList<>();
Coordinate[] coords = new Coordinate[5];
double tol = 0.001;
double left = p.getX() - tol;
double right = p.getX() + tol;
double bot = p.getY() - tol;
double top = p.getY() + tol;
coords[0] = coords[4] = new Coordinate(left, bot);
coords[1] = new Coordinate(right, bot);
coords[2] = new Coordinate(right, top);
coords[3] = new Coordinate(left, top);
Polygon poly = geometryFactory.createPolygon(coords);
Intersects filter = FF.intersects(FF.literal(poly), FF.property(geomName));
System.out.println(filter);
try {
SimpleFeatureCollection features = featureSource.getFeatures(filter);
ret.addAll(DataUtilities.list(features));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
Note the need to make the point "bigger" otherwise it probably won't ever
hit a line.
Ian
On 29 October 2015 at 10:16, João Bandeira <[email protected]> wrote:
> Hi!
>
> My name is João, I'm from Portugal, and I'm a Software and Computer
> Engineering student at FEUP. I'm contacting you about GeoTools.
>
> I'm contacting users through the email list as a suggestion given by
> Andrea, one of the geotools developers.
>
> I'm currently developing a project for college where I have to interpret a
> map of the rivers in my country. I have access to a file with info of all
> the rivers. It's a file with the extension .shp, and I was already able to
> open it using the geotools tools. I was able to open the map in the swing
> interface of geotools, and see all the rivers, and also see information of
> each river by clicking it.
> After this, I was able, with a few lines of code, to search info about a
> river by its name: I opened the file, and made a query with a filter
> applied to one of the fields (designation of the river), and it will find
> all the rivers which contain a given string in its designation.
>
> When I wrote this code, I noticed that for each river, there is some
> geometric(?) information about them, a list of coordinates. As I have no
> knowledge about this type of files and its structure, I really don't know
> how to interpret those coordinates, and I really needed some way to do that.
>
> The functionality that I need to implement is, given a pair of coordinates
> (latitude and longitude), check if it belongs to any river in the file, and
> return info about it. I know that it should be possible because using the
> swing interface, and clicking the river, it returns info about it, so I
> think that somehow the program receives coordinates about the place I
> clicked, and searches the file for a river containing those coordinates. Am
> I right?
>
> If so, and if possible, what I needed to know is how to do that... My plan
> was to reverse engineer the code with eclema for eclipse, but I couldn't
> import all the source code to my project, so I didn't succeed, that's why
> I'm contacting you. Probably what I want to do is simple, and a few
> guidelines from someone who is familiarized with the project will suffice.
> My main problem is how to convert latitude and longitude to the coordinate
> system used in the file I have, and also match a pair of coordinates to the
> info in the file (to check if they belong to any river).
>
> If it helps, here is the file I'm working with: http://1drv.ms/1SaccYG
>
> Sorry for bothering you with this, but you're probably my last resource,
> as I've been struggling with this for the last week, with no luck...
>
> Thanks and best regards,
>
> João Norim
>
>
> ------------------------------------------------------------------------------
>
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> [email protected]
> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
>
>
--
Ian Turton
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