ca.blarg.gdx.math

Class MathHelpers

java.lang.Object

ca.blarg.gdx.math.MathHelpers

public final class MathHelpers
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static com.badlogic.gdx.math.Vector3	BACKWARD_VECTOR3
static float	DOWN_2D
static com.badlogic.gdx.math.Vector2	DOWN_VECTOR2
static com.badlogic.gdx.math.Vector3	DOWN_VECTOR3
static float	EPSILON
static float	FLOAT_EPSILON
static com.badlogic.gdx.math.Vector3	FORWARD_VECTOR3
static float	LEFT_2D
static com.badlogic.gdx.math.Vector2	LEFT_VECTOR2
static com.badlogic.gdx.math.Vector3	LEFT_VECTOR3
static float	RIGHT_2D
static com.badlogic.gdx.math.Vector2	RIGHT_VECTOR2
static com.badlogic.gdx.math.Vector3	RIGHT_VECTOR3
static float	UP_2D
static com.badlogic.gdx.math.Vector2	UP_VECTOR2
static com.badlogic.gdx.math.Vector3	UP_VECTOR3

Constructor Summary

Constructors

Constructor and Description
MathHelpers()

Method Summary

Modifier and Type	Method and Description
static boolean	areAlmostEqual(float a, float b)
static boolean	areAlmostEqual(float a, float b, float tolerance)
static boolean	areAlmostEqual(float a, float b, float relativeTolerance, float absoluteTolerance)
static double	fastInverseSqrt(double x)
static float	fastInverseSqrt(float x)
static float	getAngleBetween2D(com.badlogic.gdx.math.Vector2 a, com.badlogic.gdx.math.Vector2 b)
static float	getAngleFromPointOnCircle(float x, float y)
static void	getCartesianCoordsFromSpherical(float radius, float inclination, float azimuth, com.badlogic.gdx.math.Vector3 result)
static com.badlogic.gdx.math.Vector2	getDirectionVector2(float degrees)
static void	getDirectionVector2(float degrees, com.badlogic.gdx.math.Vector2 result)
static com.badlogic.gdx.math.Vector3	getDirectionVector3FromAngles(float yawDegrees, float pitchDegrees)
static void	getDirectionVector3FromAngles(float yawDegrees, float pitchDegrees, com.badlogic.gdx.math.Vector3 result)
static com.badlogic.gdx.math.Vector3	getDirectionVector3FromYAxis(float yAxisDegrees)
static void	getDirectionVector3FromYAxis(float yAxisDegrees, com.badlogic.gdx.math.Vector3 result)
static float	getLowestQuadraticRoot(float a, float b, float c, float maxR) Basically the same as com.badlogic.gdx.math.Intersector#getLowestPositiveRoot except for the addition of a parameter maxR which limits the maximum root value we accept.
static com.badlogic.gdx.math.Vector2	getPointOnCircle(float radius, float degrees)
static void	getPointOnCircle(float radius, float degrees, com.badlogic.gdx.math.Vector2 result)
static void	getScaleFactor(com.badlogic.gdx.math.collision.BoundingBox originalSize, com.badlogic.gdx.math.collision.BoundingBox desiredSize, com.badlogic.gdx.math.Vector3 result)
static void	getScaleFactor(com.badlogic.gdx.math.Vector3 originalSize, com.badlogic.gdx.math.Vector3 desiredSize, com.badlogic.gdx.math.Vector3 result)
static float	getYAngleBetween(com.badlogic.gdx.math.Vector3 a, com.badlogic.gdx.math.Vector3 b)
static float	inverseLerp(float a, float b, float lerpValue)
static int	inverseLerp(int a, int b, int lerpValue)
static float	lerp(float a, float b, float t)
static int	lerp(int a, int b, int t)
static int	pow(int number, int power)
static long	pow(long number, int power)
static float	rolloverClamp(float value, float min, float max)
static int	rolloverClamp(int value, int min, int max)
static float	scaleRange(float value, float originalMin, float originalMax, float newMin, float newMax)
static int	scaleRange(int value, int originalMin, int originalMax, int newMin, int newMax)
static void	setLengthOf(com.badlogic.gdx.math.Vector3 v, float length)
static float	sign(float value)
static int	sign(int value)
static float	smoothStep(float low, float high, float t)

Methods inherited from class java.lang.Object

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

Field Detail

FLOAT_EPSILON

public static final float FLOAT_EPSILON

See Also:

Constant Field Values

EPSILON

public static final float EPSILON

See Also:

Constant Field Values

UP_2D

public static final float UP_2D

See Also:

Constant Field Values

DOWN_2D

public static final float DOWN_2D

See Also:

Constant Field Values

LEFT_2D

public static final float LEFT_2D

See Also:

Constant Field Values

RIGHT_2D

public static final float RIGHT_2D

See Also:

Constant Field Values

UP_VECTOR2

public static final com.badlogic.gdx.math.Vector2 UP_VECTOR2

DOWN_VECTOR2

public static final com.badlogic.gdx.math.Vector2 DOWN_VECTOR2

LEFT_VECTOR2

public static final com.badlogic.gdx.math.Vector2 LEFT_VECTOR2

RIGHT_VECTOR2

public static final com.badlogic.gdx.math.Vector2 RIGHT_VECTOR2

UP_VECTOR3

public static final com.badlogic.gdx.math.Vector3 UP_VECTOR3

DOWN_VECTOR3

public static final com.badlogic.gdx.math.Vector3 DOWN_VECTOR3

FORWARD_VECTOR3

public static final com.badlogic.gdx.math.Vector3 FORWARD_VECTOR3

BACKWARD_VECTOR3

public static final com.badlogic.gdx.math.Vector3 BACKWARD_VECTOR3

LEFT_VECTOR3

public static final com.badlogic.gdx.math.Vector3 LEFT_VECTOR3

RIGHT_VECTOR3

public static final com.badlogic.gdx.math.Vector3 RIGHT_VECTOR3

Constructor Detail

MathHelpers

public MathHelpers()

Method Detail

getDirectionVector2

public static void getDirectionVector2(float degrees,
                                       com.badlogic.gdx.math.Vector2 result)

getDirectionVector3FromYAxis

public static void getDirectionVector3FromYAxis(float yAxisDegrees,
                                                com.badlogic.gdx.math.Vector3 result)

getDirectionVector3FromAngles

public static void getDirectionVector3FromAngles(float yawDegrees,
                                                 float pitchDegrees,
                                                 com.badlogic.gdx.math.Vector3 result)

getYAngleBetween

public static float getYAngleBetween(com.badlogic.gdx.math.Vector3 a,
                                     com.badlogic.gdx.math.Vector3 b)

getAngleBetween2D

public static float getAngleBetween2D(com.badlogic.gdx.math.Vector2 a,
                                      com.badlogic.gdx.math.Vector2 b)

getPointOnCircle

public static void getPointOnCircle(float radius,
                                    float degrees,
                                    com.badlogic.gdx.math.Vector2 result)

getAngleFromPointOnCircle

public static float getAngleFromPointOnCircle(float x,
                                              float y)

getCartesianCoordsFromSpherical

public static void getCartesianCoordsFromSpherical(float radius,
                                                   float inclination,
                                                   float azimuth,
                                                   com.badlogic.gdx.math.Vector3 result)

areAlmostEqual

public static boolean areAlmostEqual(float a,
                                     float b)

areAlmostEqual

public static boolean areAlmostEqual(float a,
                                     float b,
                                     float tolerance)

areAlmostEqual

public static boolean areAlmostEqual(float a,
                                     float b,
                                     float relativeTolerance,
                                     float absoluteTolerance)

fastInverseSqrt

public static float fastInverseSqrt(float x)

fastInverseSqrt

public static double fastInverseSqrt(double x)

pow

public static int pow(int number,
                      int power)

pow

public static long pow(long number,
                       int power)

sign

public static int sign(int value)

sign

public static float sign(float value)

rolloverClamp

public static float rolloverClamp(float value,
                                  float min,
                                  float max)

rolloverClamp

public static int rolloverClamp(int value,
                                int min,
                                int max)

lerp

public static float lerp(float a,
                         float b,
                         float t)

lerp

public static int lerp(int a,
                       int b,
                       int t)

inverseLerp

public static float inverseLerp(float a,
                                float b,
                                float lerpValue)

inverseLerp

public static int inverseLerp(int a,
                              int b,
                              int lerpValue)

scaleRange

public static float scaleRange(float value,
                               float originalMin,
                               float originalMax,
                               float newMin,
                               float newMax)

scaleRange

public static int scaleRange(int value,
                             int originalMin,
                             int originalMax,
                             int newMin,
                             int newMax)

smoothStep

public static float smoothStep(float low,
                               float high,
                               float t)

getScaleFactor

public static void getScaleFactor(com.badlogic.gdx.math.collision.BoundingBox originalSize,
                                  com.badlogic.gdx.math.collision.BoundingBox desiredSize,
                                  com.badlogic.gdx.math.Vector3 result)

getScaleFactor

public static void getScaleFactor(com.badlogic.gdx.math.Vector3 originalSize,
                                  com.badlogic.gdx.math.Vector3 desiredSize,
                                  com.badlogic.gdx.math.Vector3 result)

setLengthOf

public static void setLengthOf(com.badlogic.gdx.math.Vector3 v,
                               float length)

getLowestQuadraticRoot

public static float getLowestQuadraticRoot(float a,
                                           float b,
                                           float c,
                                           float maxR)

Basically the same as com.badlogic.gdx.math.Intersector#getLowestPositiveRoot except for the addition of a parameter maxR which limits the maximum root value we accept. Anything over this will also result in a Float.NaN return value. A Float.NaN return means "no valid solution."

getDirectionVector2

public static com.badlogic.gdx.math.Vector2 getDirectionVector2(float degrees)

getDirectionVector3FromYAxis

public static com.badlogic.gdx.math.Vector3 getDirectionVector3FromYAxis(float yAxisDegrees)

getDirectionVector3FromAngles

public static com.badlogic.gdx.math.Vector3 getDirectionVector3FromAngles(float yawDegrees,
                                                                          float pitchDegrees)

getPointOnCircle

public static com.badlogic.gdx.math.Vector2 getPointOnCircle(float radius,
                                                             float degrees)