org.jbox2d.common

Class MathUtils

java.lang.Object

org.jbox2d.common.MathUtils

public class MathUtils
extends java.lang.Object

A few math methods that don't fit very well anywhere else.

Field Summary

Fields

Modifier and Type	Field and Description
static float	DEG2RAD Degrees to radians conversion factor
static float	HALF_PI
static float	INV_PI
static float	PI
static float	QUARTER_PI
static float	RAD2DEG Radians to degrees conversion factor
static float[]	sinLUT
static float	THREE_HALVES_PI
static float	TWOPI

Constructor Summary

Constructors

Constructor and Description
MathUtils()

Method Summary

Modifier and Type	Method and Description
static float	abs(float x)
static int	abs(int x)
static float	atan2(float y, float x)
static int	ceil(float x)
static int	ceilPowerOf2(int x) Rounds up the value to the nearest higher power^2 value.
static float	clamp(float a, float low, float high) Returns the closest value to 'a' that is in between 'low' and 'high'
static Vec2	clamp(Vec2 a, Vec2 low, Vec2 high)
static void	clampToOut(Vec2 a, Vec2 low, Vec2 high, Vec2 dest)
static float	cos(float x)
static float	distance(Vec2 v1, Vec2 v2)
static float	distanceSquared(Vec2 v1, Vec2 v2)
static float	fastAtan2(float y, float x)
static float	fastPow(float a, float b)
static int	floor(float x)
static boolean	isPowerOfTwo(int x)
static float	map(float val, float fromMin, float fromMax, float toMin, float toMax)
static float	max(float a, float b)
static int	max(int a, int b)
static float	min(float a, float b)
static int	min(int a, int b)
static int	nextPowerOfTwo(int x) Next Largest Power of 2: Given a binary integer value x, the next largest power of 2 can be computed by a SWAR algorithm that recursively "folds" the upper bits into the lower bits.
static float	randomFloat(float argLow, float argHigh)
static float	randomFloat(java.util.Random r, float argLow, float argHigh)
static float	reduceAngle(float theta)
static int	round(float x)
static float	sin(float x)
static float	sinLUT(float x)
static float	sqrt(float x)

Methods inherited from class java.lang.Object

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

Field Detail

PI

public static final float PI

See Also:

Constant Field Values

TWOPI

public static final float TWOPI

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Constant Field Values

INV_PI

public static final float INV_PI

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Constant Field Values

HALF_PI

public static final float HALF_PI

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Constant Field Values

QUARTER_PI

public static final float QUARTER_PI

See Also:

Constant Field Values

THREE_HALVES_PI

public static final float THREE_HALVES_PI

See Also:

Constant Field Values

DEG2RAD

public static final float DEG2RAD

Degrees to radians conversion factor

See Also:

Constant Field Values

RAD2DEG

public static final float RAD2DEG

Radians to degrees conversion factor

See Also:

Constant Field Values

sinLUT

public static final float[] sinLUT

Constructor Detail

MathUtils

public MathUtils()

Method Detail

sin

public static final float sin(float x)

sinLUT

public static final float sinLUT(float x)

cos

public static final float cos(float x)

abs

public static final float abs(float x)

abs

public static final int abs(int x)

floor

public static final int floor(float x)

ceil

public static final int ceil(float x)

round

public static final int round(float x)

ceilPowerOf2

public static final int ceilPowerOf2(int x)

Rounds up the value to the nearest higher power^2 value.

Parameters:

x -

Returns:

power^2 value

max

public static final float max(float a,
                              float b)

max

public static final int max(int a,
                            int b)

min

public static final float min(float a,
                              float b)

min

public static final int min(int a,
                            int b)

map

public static final float map(float val,
                              float fromMin,
                              float fromMax,
                              float toMin,
                              float toMax)

clamp

public static final float clamp(float a,
                                float low,
                                float high)

Returns the closest value to 'a' that is in between 'low' and 'high'

clamp

public static final Vec2 clamp(Vec2 a,
                               Vec2 low,
                               Vec2 high)

clampToOut

public static final void clampToOut(Vec2 a,
                                    Vec2 low,
                                    Vec2 high,
                                    Vec2 dest)

nextPowerOfTwo

public static final int nextPowerOfTwo(int x)

Next Largest Power of 2: Given a binary integer value x, the next largest power of 2 can be computed by a SWAR algorithm that recursively "folds" the upper bits into the lower bits. This process yields a bit vector with the same most significant 1 as x, but all 1's below it. Adding 1 to that value yields the next largest power of 2.

isPowerOfTwo

public static final boolean isPowerOfTwo(int x)

atan2

public static final float atan2(float y,
                                float x)

fastAtan2

public static final float fastAtan2(float y,
                                    float x)

reduceAngle

public static final float reduceAngle(float theta)

randomFloat

public static final float randomFloat(float argLow,
                                      float argHigh)

randomFloat

public static final float randomFloat(java.util.Random r,
                                      float argLow,
                                      float argHigh)

sqrt

public static final float sqrt(float x)

distanceSquared

public static final float distanceSquared(Vec2 v1,
                                          Vec2 v2)

distance

public static final float distance(Vec2 v1,
                                   Vec2 v2)

fastPow

public static final float fastPow(float a,
                                  float b)