org.deegree.model.spatialschema
Interface Geometry

All Superinterfaces:

Serializable

All Known Subinterfaces:

Aggregate, Boundary, Complex, ComplexBoundary, Composite, CompositeCurve, CompositePoint, CompositeSolid, CompositeSurface, Curve, CurveBoundary, MultiCurve, MultiPoint, MultiPrimitive, MultiSolid, MultiSurface, OrientableCurve, OrientablePrimitive, OrientableSurface, Point, Primitive, PrimitiveBoundary, Ring, Shell, Solid, SolidBoundary, Surface, SurfaceBoundary

All Known Implementing Classes:

AggregateImpl, BoundaryImpl, CurveBoundaryImpl, CurveImpl, GeometryImpl, MultiCurveImpl, MultiPointImpl, MultiPrimitiveImpl, MultiSurfaceImpl, OrientableCurveImpl, OrientablePrimitiveImpl, OrientableSurfaceImpl, PointImpl, PrimitiveBoundaryImpl, PrimitiveImpl, RingImpl, SurfaceBoundaryImpl, SurfaceImpl

public interface Geometry
extends Serializable

The basic interface for all geometries. it declares the methods that are common to all geometries. this doesn't means for example that all geometries defines a valid boundary but is there asked for they should be able to answer (with null).

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Version:

$Revision: 6259 $ $Date: 2007-03-20 10:15:15 +0100 (Di, 20 Mär 2007) $

Author:

Andreas Poth

Method Summary

boolean	contains(Geometry gmo) The Boolean valued operation "contains" shall return TRUE if this Geometry contains another Geometry.
boolean	contains(Position position) The Boolean valued operation "contains" shall return TRUE if this Geometry contains a single point given by a coordinate.
Geometry	difference(Geometry gmo) The "difference" operation shall return the set theoretic difference of this Geometry and the passed Geometry.
double	distance(Geometry gmo) The operation "distance" shall return the distance between this Geometry and another Geometry.
Boundary	getBoundary() returns the boundary of a geometry
Geometry	getBuffer(double distance) The operation "buffer" shall return a Geometry containing all points whose distance from this Geometry is less than or equal to the "distance" passed as a parameter.
Point	getCentroid() The operation "centroid" shall return the mathematical centroid for this Geometry.
Geometry	getConvexHull() The operation "convexHull" shall return a Geometry that represents the convex hull of this Geometry.
int	getCoordinateDimension() The operation "coordinateDimension" shall return the dimension of the coordinates that define this Geometry, which must be the same as the coordinate dimension of the coordinate reference system for this Geometry.
CoordinateSystem	getCoordinateSystem() returns the spatial reference system of a geometry
int	getDimension() The operation "dimension" shall return the inherent dimension of this Geometry, which shall be less than or equal to the coordinate dimension.
Envelope	getEnvelope() returns the bounding box of a geometry
double	getTolerance() returns the tolerance value use for topological operations
Geometry	intersection(Geometry gmo) The "intersection" operation shall return the set theoretic intersection of this Geometry and the passed Geometry.
boolean	intersects(Geometry gmo) The Boolean valued operation "intersects" shall return TRUE if this Geometry intersects another Geometry.
boolean	isEmpty() returns true if no geometry values resp. points stored within the geometry.
boolean	isWithinDistance(Geometry gmo, double distance) provide optimized proximity queries within for a distance .
void	setTolerance(double tolerance) sets tolerance value use for topological operations
void	translate(double[] d) translate a geometry by the submitted values. if the length of d is smaller then the dimension of the geometry only the first d.length'th coordinates will be translated.
Geometry	union(Geometry gmo) The "union" operation shall return the set theoretic union of this Geometry and the passed Geometry.

Method Detail

getEnvelope

Envelope getEnvelope()

returns the bounding box of a geometry

getBoundary

Boundary getBoundary()

returns the boundary of a geometry

getDimension

int getDimension()

The operation "dimension" shall return the inherent dimension of this Geometry, which shall be less than or equal to the coordinate dimension. The dimension of a collection of geometric objects shall be the largest dimension of any of its pieces. Points are 0-dimensional, curves are 1-dimensional, surfaces are 2-dimensional, and solids are 3-dimensional.

getCoordinateDimension

int getCoordinateDimension()

The operation "coordinateDimension" shall return the dimension of the coordinates that define this Geometry, which must be the same as the coordinate dimension of the coordinate reference system for this Geometry.

getCoordinateSystem

CoordinateSystem getCoordinateSystem()

returns the spatial reference system of a geometry

isEmpty

boolean isEmpty()

returns true if no geometry values resp. points stored within the geometry.

distance

double distance(Geometry gmo)

The operation "distance" shall return the distance between this Geometry and another Geometry. This distance is defined to be the greatest lower bound of the set of distances between all pairs of points that include one each from each of the two Geometries. A "distance" value shall be a positive number associated to distance units such as meters or standard foot. If necessary, the second geometric object shall be transformed into the same coordinate reference system as the first before the distance is calculated.

If the geometric objects overlap, or touch, then their distance apart shall be zero. Some current implementations use a "negative" distance for such cases, but the approach is neither consistent between implementations, nor theoretically viable.

translate

void translate(double[] d)

translate a geometry by the submitted values. if the length of d is smaller then the dimension of the geometry only the first d.length'th coordinates will be translated. If the length of d is larger then the dimension of the geometry an ArrayIndexOutOfBoundExceptions raises.

getCentroid

Point getCentroid()

The operation "centroid" shall return the mathematical centroid for this Geometry. The result is not guaranteed to be on the object. For heterogeneous collections of primitives, the centroid only takes into account those of the largest dimension. For example, when calculating the centroid of surfaces, an average is taken weighted by area. Since curves have no area they do not contribute to the average.

getConvexHull

Geometry getConvexHull()

The operation "convexHull" shall return a Geometry that represents the convex hull of this Geometry.

getBuffer

Geometry getBuffer(double distance)

The operation "buffer" shall return a Geometry containing all points whose distance from this Geometry is less than or equal to the "distance" passed as a parameter. The Geometry returned is in the same reference system as this original Geometry. The dimension of the returned Geometry is normally the same as the coordinate dimension - a collection of Surfaces in 2D space and a collection of Solids in 3D space, but this may be application defined.

contains

boolean contains(Geometry gmo)

The Boolean valued operation "contains" shall return TRUE if this Geometry contains another Geometry.

contains

boolean contains(Position position)

The Boolean valued operation "contains" shall return TRUE if this Geometry contains a single point given by a coordinate.

intersects

boolean intersects(Geometry gmo)

The Boolean valued operation "intersects" shall return TRUE if this Geometry intersects another Geometry. Within a Complex, the Primitives do not intersect one another. In general, topologically structured data uses shared geometric objects to capture intersection information.

union

Geometry union(Geometry gmo)

The "union" operation shall return the set theoretic union of this Geometry and the passed Geometry.

intersection

Geometry intersection(Geometry gmo)
                      throws GeometryException

The "intersection" operation shall return the set theoretic intersection of this Geometry and the passed Geometry.

Throws:

GeometryException

difference

Geometry difference(Geometry gmo)

The "difference" operation shall return the set theoretic difference of this Geometry and the passed Geometry.

isWithinDistance

boolean isWithinDistance(Geometry gmo,
                         double distance)

provide optimized proximity queries within for a distance . calvin added on 10/21/2003

setTolerance

void setTolerance(double tolerance)

sets tolerance value use for topological operations

Parameters:

tolerance -

getTolerance

double getTolerance()

returns the tolerance value use for topological operations

Returns:

tolerance value use for topological operations