edu.eside.flingbox.math
Class Vector2D

java.lang.Object
  edu.eside.flingbox.math.Vector2D

Direct Known Subclasses:

GravitySource

public class Vector2D
extends java.lang.Object

2D vector without application point. Also includes some basic operations with vectors.

Field Summary

float	i Vector components
float	j Vector components

Constructor Summary

Vector2D()
Default constructor for an empty vector

Vector2D(float i, float j)
Creates a new vector.

Vector2D(Vector2D v)
Copy constructor

Method Summary

Vector2D	add(Vector2D v) Adds a vector
float	angleWithVector(Vector2D v) Computes angle formed by current vector and a given vector.
float	crossProduct(Vector2D v) Computes the Z axis of the cross product
float	distanceToPoint(Vector2D p) Calculates the distance to a given point
float	dotProduct(Vector2D v) Computes the dot product
boolean	isAtSameSide(Vector2D v) computes the side of vector
float	length() Computes the length of the vector
Vector2D	mul(float s) Multiplies by a scalar
Vector2D	mul(Matrix22 m) Multiplies current vector by a matrix
static Vector2D	mul(Vector2D v, Matrix22 m) Multiplies a vector by a matrix
Vector2D	negate() Negates current vector
static Vector2D	negate(Vector2D v) Negates current vector
Vector2D	normalize() Normalizes the vector
Vector2D	normalVector() Computes the vector's normal
static Vector2D	normalVector(Vector2D v) Computes the vector's normal
float	projectOver(Vector2D v) computes the length of projected vector
Vector2D	set(float i, float j) Sets vector's values
Vector2D	set(Vector2D v) Copies values from other vector
Vector2D	sub(Vector2D v) Subs a vector
java.lang.String	toString() Returns a string representing the vector

Methods inherited from class java.lang.Object

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

Field Detail

i

public float i

Vector components

j

public float j

Vector components

Constructor Detail

Vector2D

public Vector2D()

Default constructor for an empty vector

Vector2D

public Vector2D(float i,
                float j)

Creates a new vector.

Parameters:

i - X component

j - Y component

Vector2D

public Vector2D(Vector2D v)

Copy constructor

Parameters:

v - vector to copy

Method Detail

set

public Vector2D set(Vector2D v)

Copies values from other vector

Parameters:

v - vector to be copied

set

public Vector2D set(float i,
                    float j)

Sets vector's values

Parameters:

i - x component of the vector

j - y component of the vector

length

public float length()

Computes the length of the vector

Returns:

Length of vector

negate

public Vector2D negate()

Negates current vector

negate

public static Vector2D negate(Vector2D v)

Negates current vector

add

public Vector2D add(Vector2D v)

Adds a vector

Parameters:

v - Vector

Returns:

result vector

sub

public Vector2D sub(Vector2D v)

Subs a vector

Parameters:

v - Vector

Returns:

result vector

mul

public Vector2D mul(float s)

Multiplies by a scalar

Parameters:

s - Scalar

Returns:

result vector

dotProduct

public float dotProduct(Vector2D v)

Computes the dot product

Parameters:

v - vector

Returns:

dot product

projectOver

public float projectOver(Vector2D v)

computes the length of projected vector

Parameters:

v - base vector

Returns:

length of projection

isAtSameSide

public boolean isAtSameSide(Vector2D v)

computes the side of vector

Parameters:

v - vector to be compared

Returns:

true if two vectors angle is less than 90¼

crossProduct

public float crossProduct(Vector2D v)

Computes the Z axis of the cross product

Parameters:

v - vector

Returns:

Z axis of cross product

angleWithVector

public float angleWithVector(Vector2D v)

Computes angle formed by current vector and a given vector.

Parameters:

v - Vector

Returns:

angle formed [0..PI]

mul

public static Vector2D mul(Vector2D v,
                           Matrix22 m)

Multiplies a vector by a matrix

Parameters:

v - Vector

m - Matrix

Returns:

New vector with the result

mul

public Vector2D mul(Matrix22 m)

Multiplies current vector by a matrix

Parameters:

m - Matrix

Returns:

New vector with the result

normalize

public Vector2D normalize()

Normalizes the vector

Returns:

Normalized vector

normalVector

public Vector2D normalVector()

Computes the vector's normal

Returns:

Vector with the normal.

normalVector

public static Vector2D normalVector(Vector2D v)

Computes the vector's normal

Returns:

New vector with the normal.

distanceToPoint

public float distanceToPoint(Vector2D p)

Calculates the distance to a given point

Parameters:

p - point

Returns:

distance

toString

public java.lang.String toString()

Returns a string representing the vector

Overrides:

toString in class java.lang.Object