Class Vector

java.lang.Object

cnuphys.adaptiveSwim.geometry.Point

cnuphys.adaptiveSwim.geometry.Vector

public class Vector
extends Point

Ordinary 3D vector

Author:

heddle

Field Summary

Fields inherited from class cnuphys.adaptiveSwim.geometry.Point

x, y, z

Constructor Summary

Constructors

Constructor	Description
Vector()	Create a new vetor with a zero components
Vector(double x, double y, double z)	Create a vector
Vector(Point p)	Create a Vector from a point

Method Summary

Modifier and Type	Method	Description
static double	angleBetween(Vector a, Vector b)	Compute the angle between two vectors in radians
static double	angleBetweenDeg(Vector a, Vector b)	Compute the angle between two vectors in degrees
static Vector	cross(Vector a, Vector b)	The cross product of two vectors
static void	cross(Vector a, Vector b, Vector c)	The in-place cross product of two vectors
static Vector	difference(Vector a, Vector b)	Get the difference between two vectors
static void	difference(Vector a, Vector b, Vector c)	Get the in-place difference between two vectors
double	length()	The length of the vector
double	lengthSquared()	The square of the length of the vector
static Vector	project(Vector a, Vector b)	project vector a in the direction of vector b
void	scale(double scaleFactor)	Scale a vector
void	set(double x, double y, double z)	Set the components of the vector
Vector	unitVector()	Get a unit vector in the same direction as this

Methods inherited from class cnuphys.adaptiveSwim.geometry.Point

difference, difference, distance, distance, dot, dot, toString

Methods inherited from class java.lang.Object

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

Constructor Details

Vector

public Vector()

Create a new vetor with a zero components

Vector

public Vector(Point p)

Create a Vector from a point

Parameters:

p - the point

Vector

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

Create a vector

Parameters:

x - the x coordinate

y - the y coordinate

z - the z coordinate

Method Details

lengthSquared

public double lengthSquared()

The square of the length of the vector

Returns:

the square of the length of the vector

length

public double length()

The length of the vector

Returns:

the length of the vector

set

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

Set the components of the vector

Overrides:

set in class Point

Parameters:

x - the x component

y - the y component

z - the z component

cross

public static Vector cross(Vector a,
 Vector b)

The cross product of two vectors

Parameters:

a - one vector

b - other vector

Returns:

c = a x b

cross

public static void cross(Vector a,
 Vector b,
 Vector c)

The in-place cross product of two vectors

Parameters:

a - one vector

b - other vector

c - on return c = a x b

scale

public void scale(double scaleFactor)

Scale a vector

Parameters:

scaleFactor - the scale factor

angleBetween

public static double angleBetween(Vector a,
 Vector b)

Compute the angle between two vectors in radians

Parameters:

a - one vector

b - the other vector

Returns:

the angle between two vectors in radians

angleBetweenDeg

public static double angleBetweenDeg(Vector a,
 Vector b)

Compute the angle between two vectors in degrees

Parameters:

a - one vector

b - the other vector

Returns:

the angle between two vectors in degrees

unitVector

public Vector unitVector()

Get a unit vector in the same direction as this

Returns:

a unit vector

project

public static Vector project(Vector a,
 Vector b)

project vector a in the direction of vector b

Parameters:

a - the vector to project

b - the vector whose direction we project on

Returns:

the projection of a

difference

public static Vector difference(Vector a,
 Vector b)

Get the difference between two vectors

Parameters:

a - one vector

b - the other vector

Returns:

the difference between two vectors a - b

difference

public static void difference(Vector a,
 Vector b,
 Vector c)

Get the in-place difference between two vectors

Parameters:

a - one vector

b - the other vector

c - upon return the difference between two vectors a - b