hmi.math
Class Vecf

java.lang.Object
  hmi.math.Vecf

public final class Vecf
extends Object

A collection of methods for vectors of arbitrary length represented by float arrays.

Author:

Herwin van Welbergen, Job Zwiers

Constructor Summary

private

Vecf()

Method Summary

static void	add(float[] dst, float[] a) Adds vector b to vector a.
static void	add(float[] dst, float[] a, float[] b) Adds vector a and b, puts result in dest.
static float	dot(float[] a, float[] b) Calculates the dot product for two vectors of length 3
static boolean	epsilonEquals(float[] a, float[] b, float epsilon) Tests for equality of vector components within epsilon.
static boolean	equals(float[] a, float[] b) Tests for equality of two vectors
static float[]	getVecf(float[] vecf) Rturns a new float[3] array with initialized components
static float[]	getVecf(int len) Returns a new float[] array with zero components
static void	interpolate(float[] dst, float[] a, float[] b, float alpha) Linear interpolates between vector a and b, and puts the result in vector dst: dst = (1-alpha)*a + alpha*b
static float	length(float[] a) returns the vector length
static float	lengthSq(float[] a) returns the square of the vector length
static void	negate(float[] dst) Negates a vector
static void	negate(float[] dst, float[] src) Sets vector dst to the negated version of vector src
static void	normalize(float[] a) Normalizes a, that is, a = a/|a|
static void	normalize(float[] dst, float[] a) Normalizes a, that is, dst = a/|a|
static void	pmul(float[] dst, float[] a, float[] b) Scales a vector
static void	scale(float scale, float[] dst) Scales a vector
static void	scale(float scale, float[] dst, float[] src) Scales a vector
static void	set(float[] dst, float[] src) Copies vector src to vector dst.
static void	sub(float[] dst, float[] a) Adds vector b to vector a.
static void	sub(float[] dst, float[] a, float[] b) Adds vector a and b, puts result in dest.
static String	toString(float[] config) Returns a String of the form (v[0], v[1], ....)

Methods inherited from class java.lang.Object

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

Constructor Detail

Vecf

private Vecf()

Method Detail

getVecf

public static float[] getVecf(int len)

Returns a new float[] array with zero components

getVecf

public static float[] getVecf(float[] vecf)

Rturns a new float[3] array with initialized components

equals

public static boolean equals(float[] a,
                             float[] b)

Tests for equality of two vectors

epsilonEquals

public static boolean epsilonEquals(float[] a,
                                    float[] b,
                                    float epsilon)

Tests for equality of vector components within epsilon.

toString

public static String toString(float[] config)

Returns a String of the form (v[0], v[1], ....)

set

public static void set(float[] dst,
                       float[] src)

Copies vector src to vector dst.

add

public static void add(float[] dst,
                       float[] a,
                       float[] b)

Adds vector a and b, puts result in dest.

add

public static void add(float[] dst,
                       float[] a)

Adds vector b to vector a.

sub

public static void sub(float[] dst,
                       float[] a,
                       float[] b)

Adds vector a and b, puts result in dest.

sub

public static void sub(float[] dst,
                       float[] a)

Adds vector b to vector a.

scale

public static void scale(float scale,
                         float[] dst)

Scales a vector

scale

public static void scale(float scale,
                         float[] dst,
                         float[] src)

Scales a vector

pmul

public static void pmul(float[] dst,
                        float[] a,
                        float[] b)

Scales a vector

negate

public static void negate(float[] dst,
                          float[] src)

Sets vector dst to the negated version of vector src

negate

public static void negate(float[] dst)

Negates a vector

dot

public static float dot(float[] a,
                        float[] b)

Calculates the dot product for two vectors of length 3

lengthSq

public static float lengthSq(float[] a)

returns the square of the vector length

length

public static float length(float[] a)

returns the vector length

interpolate

public static void interpolate(float[] dst,
                               float[] a,
                               float[] b,
                               float alpha)

Linear interpolates between vector a and b, and puts the result in vector dst: dst = (1-alpha)*a + alpha*b

normalize

public static void normalize(float[] dst,
                             float[] a)

Normalizes a, that is, dst = a/|a|

Parameters:

a - vector to be normalized

dst - vector to receive the result

normalize

public static void normalize(float[] a)

Normalizes a, that is, a = a/|a|

Parameters:

a - vector to be normalized