org.lcsim.spacegeom

Class SpacePointVector

java.lang.Object

org.lcsim.spacegeom.SpacePointVector

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

CartesianPointVector, CylindricalPointVector, SpacePath, SphericalPointVector

public class SpacePointVector
extends Object
implements Serializable, Cloneable

A vector at a point in space. The vector can be constructed in Cartesian, cylindrical or spherical coordinates and components can be fetched for any of these systems. The default constructor creates a vector of zero length at the origin. Finite vectors of nonzero length at any point can be constructed using subclasses.

The point and vector stored in a space vector cannot be modified except by assignment from another space vector.

Transformations (translations, rotations, etc) are not provided. It is expected these will be carried out by external functions which return new SpacePointVector objects.

The three orthogonal coordinate systems are defined in the usual way:

• Cartesian: (x, y, z)
• Cylindrical: (rxy, phi, z)
• Spherical: (rxyz, theta, phi) .

The rotation from Cartesian to cylindrical:

cosj sinj 0 - sinj cosj 0 0 0 1

The rotation from cylindrical to Cartesian:

cosj - sinj 0 sinj cosj 0 0 0 1

The rotation from Cartesian to spherical:

sinJcosj sinJsinj cosJ cosJcosj cosJsinj - sinJ - sinj cosj 0

The rotation from spherical to Cartesian:

sinJcosj cosJcosj - sinj sinJsinj cosJsinj cosj cosJ - sinJ 0

Version:

$Id: SpacePointVector.java,v 1.1.1.1 2010/12/01 00:15:57 jeremy Exp $

Author:

Norman A. Graf

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
(package private) SpaceVector	direction
(package private) SpacePoint	startPoint

Constructor Summary

Constructors

Constructor and Description
SpacePointVector()
SpacePointVector(SpacePoint start, SpacePoint end)
SpacePointVector(SpacePoint start, SpaceVector dir)
SpacePointVector(SpacePointVector spv) Copy Constructor

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone()
boolean	equals(SpacePointVector spv)
SpaceVector	getDirection()
SpacePoint	getEndPoint()
SpacePoint	getPointAtLength(double alpha) The SpacePath can be parametrized by its length.
SpacePoint	getStartPoint()
double	magnitude() magnitude
boolean	notEquals(SpacePointVector spv)
String	toString()
double	v_phi() v_phi
double	v_rxy() v_rxy
double	v_rxyz() v_rxyz
double	v_theta() v_theta
double	v_x() v_x
double	v_y() v_y
double	v_z() v_z

Methods inherited from class java.lang.Object

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

Field Detail

startPoint

SpacePoint startPoint

direction

SpaceVector direction

Constructor Detail

SpacePointVector

public SpacePointVector()

SpacePointVector

public SpacePointVector(SpacePointVector spv)

Copy Constructor

SpacePointVector

public SpacePointVector(SpacePoint start,
                SpaceVector dir)

SpacePointVector

public SpacePointVector(SpacePoint start,
                SpacePoint end)

Method Detail

clone

public Object clone()

Overrides:

clone in class Object

v_x

public double v_x()

v_x

Returns:

double

v_y

public double v_y()

v_y

Returns:

double

v_z

public double v_z()

v_z

Returns:

double

v_rxy

public double v_rxy()

v_rxy

Returns:

double

v_phi

public double v_phi()

v_phi

Returns:

double

v_rxyz

public double v_rxyz()

v_rxyz

Returns:

double

v_theta

public double v_theta()

v_theta

Returns:

double

magnitude

public double magnitude()

magnitude

Returns:

double

equals

public boolean equals(SpacePointVector spv)

notEquals

public boolean notEquals(SpacePointVector spv)

Parameters:

spv -

Returns:

!

getStartPoint

public SpacePoint getStartPoint()

getEndPoint

public SpacePoint getEndPoint()

getDirection

public SpaceVector getDirection()

getPointAtLength

public SpacePoint getPointAtLength(double alpha)

The SpacePath can be parametrized by its length. Determines the point in space at a distance alpha from the Origin.

Parameters:

alpha - The length parameters. All real values are valid.

Returns:

A SpacePoint at Origin + alpha* (Endpoint - Origin)

toString

public String toString()

Overrides:

toString in class Object