SubdivideLines Class Reference

Subdivides lines of a given LineString. More...

Inheritance diagram for SubdivideLines:

Collaboration diagram for SubdivideLines:

Public Member Functions
String	getURI ()
List< LineString >	createSegments (Geometry track, double numberOfPoints) throws NoSuchAuthorityCodeException, FactoryException
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Protected Member Functions
Geometry	relation (Geometry geom, Double value)

Detailed Description

Subdivides lines of a given LineString.

Member Function Documentation

createSegments()

List<LineString> createSegments	(	Geometry	track,
		double	numberOfPoints
	)		throws NoSuchAuthorityCodeException, FactoryException

                                                                                                                                            {
                GeometryFactory fac=new GeometryFactory();
        //GeometryFactory geometryFactory = new GeometryFactory(new PrecisionModel(PrecisionModel.FLOATING));
        List<LineString> segments = new ArrayList<>();
        int i=0;
        for(int j=0;j<track.getNumGeometries();j++) {
                List<Coordinate> coords=new LinkedList<Coordinate>();
                for(Coordinate coord:track.getGeometryN(j).getCoordinates()) {
                        if(i<numberOfPoints) {
                                coords.add(coord);
                        }else {
                                segments.add(fac.createLineString(coords.toArray(new Coordinate[0])));
                                coords=new LinkedList<Coordinate>();
                                i=0;
                        }
                }
        }
        return segments;
    }

Referenced by SubdivideLines.relation().

evaluate()

Value evaluate ( ValueFactory  valueFactory, Value...  args  ) throws ValueExprEvaluationException

inherited

                                                                                                            {
                if (args.length != 2) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 2 arguments, got " + args.length);
                }
 
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                Double value=Double.valueOf(args[1].stringValue());
                if(l instanceof VectorLiteral) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        Geometry result = relation(geom,value);
                        return valueFactory.createLiteral(((VectorLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");
        }

References LiteralRegistry.getLiteral(), and GeometricModifierDoubleFunction.relation().

Referenced by DensifyTest.testDensify(), EnsureClosedTest.testEnsureClosed(), EnsureClosedTest.testEnsureClosed2(), RemoveGeometryTest.testRemoveGeometry1(), RemoveGeometryTest.testRemoveGeometry1Z(), RemoveGeometryTest.testRemoveGeometry2(), RemoveGeometryTest.testRemoveGeometry2Z(), RemoveRepeatedPointsTest.testRemoveRepeatedPoints(), SimplifyTest.testSimplify(), and SimplifyVWTest.testSimplifyVW().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_subdividelines.stringValue();
        }

References POSTGIS.st_subdividelines.

relation()

Geometry relation ( Geometry  geom, Double  value  )

protected

Reimplemented from GeometricModifierDoubleFunction.

                                                                 {
        double segmentLength = value;
 
        List<LineString> linestrings;
        try {
                        linestrings = createSegments(geom, segmentLength);
                GeometryFactory fac=new GeometryFactory();
                return fac.createMultiLineString(linestrings.toArray(new LineString[0]));       
        } catch (FactoryException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
        return null;
 }

References SubdivideLines.createSegments().