Package healpix.essentials

Class Vec3

java.lang.Object

healpix.essentials.Vec3

public class Vec3
extends Object

Cartesian 3-vector. Instead of using the javax.vecmath.Vector3d class, this separate class was implemented for two reasons: first, to avoid the external dependency from vecmath.jar, and also because the function Vector3d.angle(Vector3d v1) is too inaccurate for usage in Healpix for very small angles.

Author:

Martin Reinecke

Copyright:

(C) 2011-2015 Max-Planck-Society

Field Summary

Fields

Modifier and Type	Field	Description
double	x
double	y
double	z

Constructor Summary

Constructors

Constructor	Description
Vec3()	Default constructor.
Vec3(double[] arr)
Vec3(double x1, double y1, double z1)	Creation from individual components
Vec3(Pointing ptg)	Conversion from Pointing
Vec3(Vec3 v)
Vec3(Zphi zphi)	Conversion from Zphi

Method Summary

Modifier and Type	Method	Description
Vec3	add(Vec3 v)	Vector addition
final double	angle(Vec3 v1)	Angle between two vectors.
Vec3	cross(Vec3 v)	Vector cross product.
final double	dot(Vec3 v1)	Computes the dot product of the this vector and v1.
boolean	equals(Object o)
void	flip()	Invert the signs of all components
Vec3	flipped()
int	hashCode()
final double	length()	Vector length
final double	lengthSquared()	Squared vector length
Vec3	mul(double n)	Vector scaling.
Vec3	norm()	Return normalized vector
void	normalize()	Normalize the vector
void	scale(double n)	Scale the vector by a given factor
Vec3	sub(Vec3 v)	Vector subtraction
double[]	toArray()
void	toArray(double[] arr)
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

x

public double x

y

public double y

z

public double z

Constructor Details

Vec3

public Vec3()

Default constructor.

Vec3

public Vec3(Vec3 v)

Vec3

public Vec3(double x1,
 double y1,
 double z1)

Creation from individual components

Vec3

public Vec3(Pointing ptg)

Conversion from Pointing

Vec3

public Vec3(Zphi zphi)

Conversion from Zphi

Vec3

public Vec3(double[] arr)

Method Details

length

public final double length()

Vector length

Returns:

the length of the vector.

lengthSquared

public final double lengthSquared()

Squared vector length

Returns:

the squared length of the vector.

normalize

public void normalize()

Normalize the vector

norm

public Vec3 norm()

Return normalized vector

angle

public final double angle(Vec3 v1)

Angle between two vectors.

Parameters:

v1 - another vector

Returns:

the angle in radians between this vector and v1; constrained to the range [0,PI].

cross

public Vec3 cross(Vec3 v)

Vector cross product.

Parameters:

v - another vector

Returns:

the vector cross product between this vector and v

mul

public Vec3 mul(double n)

Vector scaling.

Parameters:

n - the scale number to be multiply to the coordinates x,y,z

Returns:

the vector with coordinates multiplied by n

flip

public void flip()

Invert the signs of all components

flipped

public Vec3 flipped()

scale

public void scale(double n)

Scale the vector by a given factor

Parameters:

n - the scale factor

dot

public final double dot(Vec3 v1)

Computes the dot product of the this vector and v1.

Parameters:

v1 - another vector

Returns:

dot product

add

public Vec3 add(Vec3 v)

Vector addition

Parameters:

v - the vector to be added

Returns:

addition result

sub

public Vec3 sub(Vec3 v)

Vector subtraction

Parameters:

v - the vector to be subtracted

Returns:

subtraction result

toString

public String toString()

Overrides:

toString in class Object

toArray

public double[] toArray()

toArray

public void toArray(double[] arr)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object