LineLength3D Class Reference

Inheritance diagram for LineLength3D:

Collaboration diagram for LineLength3D:

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

Static Public Member Functions
static double	length3D (CoordinateSequence pts)
	FROM org.h2gis.drivers.utility; GPL3. More...
static double	length3D (Geometry geom)
	Returns the 3D length of the geometry. More...
static double	length3D (LineString lineString)
	Returns the 3D perimeter of a line string. More...
static double	length3D (Polygon polygon)
	Returns the 3D perimeter of a polygon. More...

Member Function Documentation

attribute()

double attribute

(

Geometry

geom

)

References LineLength3D.length3D().

                                               {
                return length3D(geom);
        }

evaluate()

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

inherited

References GeometricDoubleAttributeFunction.attribute(), and LiteralRegistry.getLiteral().

                                                                                                            {
                if (args.length != 1) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 1 arguments, got " + args.length);
                }

                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof VectorLiteral) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        double result = attribute(geom);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");

        }

getURI()

String getURI

(

)

References POSTGIS.st_lineLength3D.

                               {
                return POSTGIS.st_lineLength3D.stringValue();
        }

length3D() [1/4]

static double length3D ( CoordinateSequence  pts )

static

FROM org.h2gis.drivers.utility; GPL3.

Computes the length of a linestring specified by a sequence of points. if a coordinate has a NaN z return 0.

Parameters

pts	the points specifying the linestring

Returns

the length of the linestring

References Coordinate.x, Coordinate.y, and Coordinate.z.

Referenced by Length3D.attribute(), Perimeter3D.attribute(), LineLength3D.attribute(), and LineLength3D.length3D().

                                                          {
            // optimized for processing CoordinateSequences
            int n = pts.size();
            if (n <= 1) {
                    return 0.0;
            }

            double len = 0.0;

            Coordinate p = new Coordinate();
            pts.getCoordinate(0, p);
            double x0 = p.x;
            double y0 = p.y;
            double z0 = p.z;

            if (Double.isNaN(z0)) {
                    return 0.0;
            }

            for (int i = 1; i < n; i++) {
                    pts.getCoordinate(i, p);

                    double x1 = p.x;
                    double y1 = p.y;
                    double z1 = p.z;
                    if (Double.isNaN(z1)) {
                            return 0.0;
                    }
                    double dx = x1 - x0;
                    double dy = y1 - y0;
                    double dz = z1 - z0;

                    len += Math.sqrt(dx * dx + dy * dy + dz * dz);
                    x0 = x1;
                    y0 = y1;
                    z0 = z1;
            }
            return len;
    }

length3D() [2/4]

static double length3D ( Geometry  geom )

static

Returns the 3D length of the geometry.

Parameters

geom

Returns

References LineLength3D.length3D().

                                                 {
            double sum = 0;
            for (int i = 0; i < geom.getNumGeometries(); i++) {
                    Geometry subGeom = geom.getGeometryN(i);
                    if (subGeom instanceof Polygon) {
                            sum += length3D((Polygon) subGeom);
                    } else if (subGeom instanceof LineString) {
                            sum += length3D((LineString) subGeom);
                    }
            }
            return sum;
    }

length3D() [3/4]

static double length3D ( LineString  lineString )

static

Returns the 3D perimeter of a line string.

Parameters

lineString

Returns

References LineLength3D.length3D().

                                                         {
            return length3D(lineString.getCoordinateSequence());
    }

length3D() [4/4]

static double length3D ( Polygon  polygon )

static

Returns the 3D perimeter of a polygon.

Parameters

polygon

Returns

References LineLength3D.length3D().

                                                   {
            double len = 0.0;
            len += length3D(polygon.getExteriorRing().getCoordinateSequence());
            for (int i = 0; i < polygon.getNumInteriorRing(); i++) {
                    len += length3D(polygon.getInteriorRingN(i));
            }
            return len;
    }