org.orekit.attitudes.directions
Class NadirDirection

java.lang.Object
  org.orekit.attitudes.directions.NadirDirection

All Implemented Interfaces:

IDirection

public final class NadirDirection
extends Object
implements IDirection

Nadir direction. This direction depends on the body shape and the satellite position.

Since:

1.2

Version:

$Id: NadirDirection.java 11329 2014-10-29 15:21:19Z maggiorani $

Author:

Julie Anton

Concurrency :

conditionally thread-safe

Concurrency comment :

The use of a celestial body linked to the tree of frames makes this class thread-safe only if the underlying CelestialBody is too.

Constructor Summary

NadirDirection(BodyShape bodyShape)
Simple constructor

Method Summary

Line	getLine(PVCoordinatesProvider pvCoord, AbsoluteDate date, Frame frame) Provides the line containing the origin (given PV coordinates) and directed by the direction vector.
Vector3D	getVector(PVCoordinatesProvider pvCoord, AbsoluteDate date, Frame frame) Provides the direction vector at a given date in a given frame.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NadirDirection

public NadirDirection(BodyShape bodyShape)

Simple constructor

Parameters:

bodyShape - : body shape

Method Detail

getVector

public Vector3D getVector(PVCoordinatesProvider pvCoord,
                          AbsoluteDate date,
                          Frame frame)
                   throws OrekitException

Description copied from interface: IDirection

Provides the direction vector at a given date in a given frame.

Specified by:

getVector in interface IDirection

Parameters:

pvCoord - the current coordinates of the origin point of the direction (may be null, in that specific case, the origin of the direction is the frame origin).

date - the date

frame - the frame to project the vector's coordinates

Returns:

the direction vector at the given date in the given frame

Throws:

OrekitException - if some frame specific errors occur

getLine

public Line getLine(PVCoordinatesProvider pvCoord,
                    AbsoluteDate date,
                    Frame frame)
             throws OrekitException

Description copied from interface: IDirection

Provides the line containing the origin (given PV coordinates) and directed by the direction vector.

Specified by:

getLine in interface IDirection

Parameters:

pvCoord - the origin of the direction

date - the current date

frame - the expression frame of the line

Returns:

the Line of space containing the origin and direction vector

Throws:

OrekitException - if some frame specific errors occur