net.jinx.math
Class MathUtil

java.lang.Object
  net.jinx.math.MathUtil

public class MathUtil
extends java.lang.Object

Provides utility methods for various mathematical and physics operations.

API Stability: Beta; the main(String[]) method isn't staying.

Field Summary

static float	E
static float	PI

Method Summary

static float	acos(float theta)
static float	asin(float t)
static float	atan(float theta)
static float	atan2(float y, float x)
static Vector	calcCenterOfMass(Vector[] positions, float[] masses) Calculates the center of mass for a set of point masses in object space.
static Matrix3	calcInertiaTensor(Vector[] positions, float[] masses) Calculates an inertia tensor from a set of point masses and their positions in object space.
static float	cos(float theta)
static void	main(java.lang.String[] args) Test method.
static float	sin(float t)
static float	sqrt(float v)
static float	tan(float theta)
static float	toDegrees(float theta)
static float	toRadians(float theta)

Methods inherited from class java.lang.Object

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

Field Detail

E

public static final float E

See Also:

Constant Field Values

PI

public static final float PI

See Also:

Constant Field Values

Method Detail

sin

public static float sin(float t)

cos

public static float cos(float theta)

tan

public static float tan(float theta)

asin

public static float asin(float t)

acos

public static float acos(float theta)

atan

public static float atan(float theta)

atan2

public static float atan2(float y,
                          float x)

sqrt

public static float sqrt(float v)

toDegrees

public static float toDegrees(float theta)

toRadians

public static float toRadians(float theta)

calcCenterOfMass

public static Vector calcCenterOfMass(Vector[] positions,
                                      float[] masses)

Calculates the center of mass for a set of point masses in object space.

Parameters:

positions - the positions of the point masses.

masses - the masses of the point masses.

Returns:

the center as a Vector.

Throws:

java.lang.IllegalArgumentException - if positions and masses aren't the same length or if the input arrays are empty.

calcInertiaTensor

public static Matrix3 calcInertiaTensor(Vector[] positions,
                                        float[] masses)

Calculates an inertia tensor from a set of point masses and their positions in object space.

Parameters:

positions - the positions of the point masses.

masses - the masses of the point masses.

Returns:

the intertia tensor as a Matrix3.

Throws:

java.lang.IllegalArgumentException - if positions and masses aren't the same length or if the input arrays are empty.

main

public static void main(java.lang.String[] args)

Test method. This is not a permanent method; don't cound on it staying.