htm.core

Class Vector3d

java.lang.Object

htm.core.Vector3d

public class Vector3d
extends Object

3-d vector class with conversion to ra/dec

The Vector3d is a standard 3D vector class with the addition that each coordinate (x,y,z) is also kept in ra,dec since we expect the vector to live on the surface of the unit sphere, i.e.

  x2 + y2 + z2  = 1

This is not enforced, so you can specify a vector that has not unit length. If you request the ra/dec of such a vector, it will be automatically normalized to length 1 and you get the ra/dec of that vector (the intersection of the vector's direction with the unit sphere. Vector multiplaction addition etc are inplemented on this class

 Current Version
 ===============
 ID:    $Id: Vector3d.java,v 1.3 2003/02/19 15:46:11 womullan Exp $
 Revision:      $Revision: 1.3 $
 Date/time:     $Date: 2003/02/19 15:46:11 $

Version:

$Revision: 1.3 $

Field Summary

Fields

Modifier and Type	Field and Description
(package private) double	dec_
(package private) boolean	okRaDec_
(package private) double	ra_
(package private) double	x_
(package private) double	y_
(package private) double	z_

Constructor Summary

Constructors

Constructor and Description
Vector3d() Default cunstructor constructs (1,0,0), ra=0, dec=0.
Vector3d(double ra, double dec) Construct from ra/dec
Vector3d(double x, double y, double z) Constructor from three coordinates
Vector3d(Vector3d copy) Copy constructor

Method Summary

Modifier and Type	Method and Description
Vector3d	add(Vector3d v) vector addition
Vector3d	cross(Vector3d v) vector cross product
double	dec() return dec
boolean	equal(Vector3d v) comparison
double[]	get() Get x,y,z
double	length() return length of vector
Vector3d	mul(double n) multiply with a number
double	mul(Vector3d v) dot product
void	normalize() Normalize vector length to 1
double	ra() return ra
void	set(double ra, double dec) Set member function: set values using ra/dec
void	set(double x, double y, double z) Set member function: set values
Vector3d	sub(Vector3d v) vector subtraction
String	toString() convert to string : print x y z as "x y z"
protected void	updateRaDec() Update ra_ and dec_ from x_ y_ z_ variables
protected void	updateXYZ() Update x_ y_ z_ from ra_ and dec_ variables
double	x() return x (only as rvalue)
double	y() return y
double	z() return z

Methods inherited from class java.lang.Object

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

Field Detail

x_

double x_

y_

double y_

z_

double z_

ra_

double ra_

dec_

double dec_

okRaDec_

boolean okRaDec_

Constructor Detail

Vector3d

public Vector3d()

Default cunstructor constructs (1,0,0), ra=0, dec=0.

Vector3d

public Vector3d(double x,
                double y,
                double z)

Constructor from three coordinates

Vector3d

public Vector3d(double ra,
                double dec)

Construct from ra/dec

Vector3d

public Vector3d(Vector3d copy)

Copy constructor

Method Detail

set

public void set(double x,
                double y,
                double z)

Set member function: set values

set

public void set(double ra,
                double dec)

Set member function: set values using ra/dec

get

public double[] get()

Get x,y,z

length

public double length()

return length of vector

x

public double x()

return x (only as rvalue)

y

public double y()

return y

z

public double z()

return z

normalize

public void normalize()

Normalize vector length to 1

toString

public String toString()

convert to string : print x y z as "x y z"

Overrides:

toString in class Object

cross

public Vector3d cross(Vector3d v)

vector cross product

equal

public boolean equal(Vector3d v)

comparison

mul

public Vector3d mul(double n)

multiply with a number

mul

public double mul(Vector3d v)

dot product

add

public Vector3d add(Vector3d v)

vector addition

sub

public Vector3d sub(Vector3d v)

vector subtraction

dec

public double dec()

return dec

ra

public double ra()

return ra

updateXYZ

protected void updateXYZ()

Update x_ y_ z_ from ra_ and dec_ variables

updateRaDec

protected void updateRaDec()

Update ra_ and dec_ from x_ y_ z_ variables