OffsetCurve Class Reference

Calculates an offset curve from a given geometry and a given distance. More...

Inheritance diagram for OffsetCurve:

Collaboration diagram for OffsetCurve:

Public Member Functions
String	getURI ()
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

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

Detailed Description

Calculates an offset curve from a given geometry and a given distance.

Member Function Documentation

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_offsetCurve.stringValue();
        }

References POSTGIS.st_offsetCurve.

relation()

Geometry relation ( Geometry  geom, Double  distance  )

protected

Reimplemented from GeometricModifierDoubleFunction.

                                                                    {
        BufferParameters bufParams = new BufferParameters();
        OffsetCurveBuilder ocb = new OffsetCurveBuilder(geom.getFactory().getPrecisionModel(), bufParams);
        Coordinate[] pts = ocb.getOffsetCurve(geom.getCoordinates(), distance);
        Geometry curve = geom.getFactory().createLineString(pts);
        return curve;
        }