org.geolatte.geom

Class Position

java.lang.Object

org.geolatte.geom.Position

Direct Known Subclasses:

C2D, G2D, M, V

public abstract class Position
extends Object

Represents a position in a coordinate system.

A Position is represented by an array of coordinates. There must be at least two coordinates.

The order of coordinates must follow the order: x, y, z, measure (easting, northing, altitude, measure) for coordinates in a projected coordinate reference system, or longitude, latitude, altitude, measure for coordinates in a geographic coordinate reference system).

Usually the first coordinate value (X or Lon) increases along an EAST axis direction, and the second (Y or Lat) along an NORTH axis direction. In some projected coordinate systems, such as those used in South-Africa, the orientation is WEST for the first and SOUTH for the second coordinate value. To be sure of the interpretation of the first and second coordinate, you can inspect the CoordinateReferenceSystem used with the Position.

Author:

Karel Maesen, Geovise BVBA creation-date: 2/19/14

Field Summary

Fields

Modifier and Type	Field and Description
protected double[]	coords

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Position(double... coords) Constructs an instance with the specified coordinates

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
double	getCoordinate(CoordinateSystemAxis axis, CoordinateReferenceSystem<?> crs) Gets the coordinate value for the specified axis
double	getCoordinate(int idx) Returns the coordinate at the specified index
abstract int	getCoordinateDimension()
int	hashCode()
boolean	isEmpty()
double[]	toArray(double[] dest) Copies the coordinates of this Position in the specified Array, in normal order.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

coords

protected final double[] coords

Constructor Detail

Position

protected Position(double... coords)

Constructs an instance with the specified coordinates

Parameters:

coords -

Method Detail

toArray

public double[] toArray(double[] dest)

Copies the coordinates of this Position in the specified Array, in normal order.

If the array is null or smaller than the coordinate dimension, then a new Array instance will be created.

Parameters:

dest - the recipient of the coordinates of this instance (if large enough)

Returns:

an array (possibly the same instance as specified by dest) holding the coordinates of this Position

getCoordinateDimension

public abstract int getCoordinateDimension()

isEmpty

public boolean isEmpty()

getCoordinate

public double getCoordinate(int idx)

Returns the coordinate at the specified index

Note that the index here refers to the coordinates ordered in a normalized order.

Parameters:

idx - the index of the coordinate (0-based)

Returns:

the coordinate value at the specified index.

getCoordinate

public double getCoordinate(CoordinateSystemAxis axis,
                            CoordinateReferenceSystem<?> crs)

Gets the coordinate value for the specified axis

Parameters:

axis - the CoordinateSystemAxis for which to get the coordinate

Returns:

the coordinate value for the specified axis

Throws:

IllegalArgumentException - if the specified axis is not present in the CoordinateReferenceSystem of this instance

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object