Given a polygon that I trace with Coordinates of Latitude and Longitude, given an fline that I also receive in (in Latitude, Longitude).
I need to know if this point is inside my polygon or not
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.Polygon;
import org.locationtech.jts.geom.PrecisionModel;
import org.opengis.geometry.MismatchedDimensionException;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.NoSuchAuthorityCodeException;
import org.opengis.referencing.operation.TransformException;
private void isPointInPolygon() {
GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
Coordinate[] coords = new Coordinate[] { new Coordinate(40.174256, -3.483185),
new Coordinate(40.173279, -3.481339), new Coordinate(40.172597, -3.482541),
new Coordinate(40.173403, -3.485401), new Coordinate(40.174256, -3.483185) };
Polygon polygon = geometryFactory.createPolygon(coords);
System.out.println("polygon : " + polygon.isValid());
double scale = Math.pow(10, 2);
PrecisionModel pm = new PrecisionModel(scale);
GeometryFactory gf = new GeometryFactory(pm);
Geometry testPoint = gf.createPoint(new Coordinate(40.173597, -3.483798));
System.out.println("polygon contains point : " + polygon.contains(testPoint));
}
// MAVEN
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-geojson</artifactId>
<version>24-SNAPSHOT</version>
</dependency>
The following code is correct, that is, it does not give any error.
I have doubt if its result is correct, or if I have to do some kind of conversion for the result to be correct. If I have to flatten it or if it is code, it already knows how to cure well.
Provided that your polygon is reasonably small it will be fine.
If your polygon: