tig.maths

Class Vector2

java.lang.Object

tig.maths.Vector2

public class Vector2
extends java.lang.Object

Simple representation of a vector in a 2D space.
Represented as 2 doubles.

Field Summary

Fields

Modifier and Type	Field and Description
double	x0 First coordinate of this vector.
double	x1 Second coordinate of this vector.

Constructor Summary

Constructors

Constructor and Description
Vector2(double[] coords) Constructor from an array containing 2 doubles.
Vector2(double a0, double a1) Constructor from 2 doubles.

Method Summary

Modifier and Type	Method and Description
static Vector2	add(Vector2 a, Vector2 b) Returns a Vector2 c such as c = a + b.
static Vector2	mul(double k, Vector2 a) Multiplication of a vector by a scalar ; returns a vector b such as b = k a.
static Vector2	mul(Matrix2 M, Vector2 a) Multiplication of a vector by a matrix ; returns a vector b such as b = M a.
static Vector2	negate(Vector2 a) Returns a Vector2 b such as b = -a.
static double	norm(Vector2 v) Returns the norm of the vector passed in parameter.
static Vector2	sub(Vector2 a, Vector2 b) Returns a Vector2 c such as c = a - b.
java.lang.String	toString() Returns a String representation of this Vector.

Methods inherited from class java.lang.Object

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

Field Detail

x0

public double x0

First coordinate of this vector.

x1

public double x1

Second coordinate of this vector.

Constructor Detail

Vector2

public Vector2(double a0,
               double a1)

Constructor from 2 doubles.

Vector2

public Vector2(double[] coords)

Constructor from an array containing 2 doubles.

Throws:

java.lang.IllegalArgumentException - if coords.length != 2.

Method Detail

toString

public java.lang.String toString()

Returns a String representation of this Vector. The form is : (x0, x1).

Overrides:

toString in class java.lang.Object

norm

public static double norm(Vector2 v)

Returns the norm of the vector passed in parameter.

mul

public static Vector2 mul(Matrix2 M,
                          Vector2 a)

Multiplication of a vector by a matrix ; returns a vector b such as b = M a.

mul

public static Vector2 mul(double k,
                          Vector2 a)

Multiplication of a vector by a scalar ; returns a vector b such as b = k a.

sub

public static Vector2 sub(Vector2 a,
                          Vector2 b)

Returns a Vector2 c such as c = a - b.

add

public static Vector2 add(Vector2 a,
                          Vector2 b)

Returns a Vector2 c such as c = a + b.

negate

public static Vector2 negate(Vector2 a)

Returns a Vector2 b such as b = -a.