MathHelper

java.lang.Object
- net.minecraft.util.MathHelper

public class MathHelper
extends java.lang.Object

Field Summary

Fields
Modifier and Type	Field and Description
`private static double`	`field_181163_d`
`private static double[]`	`field_181164_e`
`private static double[]`	`field_181165_f`
`private static int[]`	`multiplyDeBruijnBitPosition` Though it looks like an array, this is really more like a mapping.
`private static float[]`	`SIN_TABLE` A table of sin values computed from 0 (inclusive) to 2pi (exclusive), with steps of 2PI / 65536.
`static float`	`SQRT_2`

Constructor Summary

Constructors
Constructor and Description

MathHelper()

Constructors
Constructor and Description
`MathHelper()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static int`	`abs_int(int value)` Returns the unsigned value of an int.
`static double`	`abs_max(double p_76132_0_, double p_76132_2_)` Maximum of the absolute value of two numbers.
`static float`	`abs(float value)`
`static double`	`average(long[] values)`
`static int`	`bucketInt(int p_76137_0_, int p_76137_1_)` Buckets an integer with specifed bucket sizes.
`static int`	`calculateLogBaseTwo(int value)` Efficiently calculates the floor of the base-2 log of an integer value.
`private static int`	`calculateLogBaseTwoDeBruijn(int value)` Uses a B(2, 5) De Bruijn sequence and a lookup table to efficiently calculate the log-base-two of the given value.
`static int`	`ceiling_double_int(double value)`
`static int`	`ceiling_float_int(float value)`
`static double`	`clamp_double(double num, double min, double max)`
`static float`	`clamp_float(float num, float min, float max)` Returns the value of the first parameter, clamped to be within the lower and upper limits given by the second and third parameters
`static int`	`clamp_int(int num, int min, int max)` Returns the value of the first parameter, clamped to be within the lower and upper limits given by the second and third parameters.
`static float`	`cos(float value)` cos looked up in the sin table with the appropriate offset
`static double`	`denormalizeClamp(double p_151238_0_, double p_151238_2_, double p_151238_4_)`
`static boolean`	`epsilonEquals(float p_180185_0_, float p_180185_1_)`
`static long`	`floor_double_long(double value)` Long version of floor_double
`static int`	`floor_double(double value)` Returns the greatest integer less than or equal to the double argument
`static int`	`floor_float(float value)` Returns the greatest integer less than or equal to the float argument
`static int`	`func_154353_e(double value)`
`static int`	`func_154354_b(int p_154354_0_, int p_154354_1_)`
`static int`	`func_180181_b(int p_180181_0_, int p_180181_1_, int p_180181_2_)`
`static int`	`func_180183_b(float p_180183_0_, float p_180183_1_, float p_180183_2_)`
`static int`	`func_180188_d(int p_180188_0_, int p_180188_1_)`
`static double`	`func_181159_b(double p_181159_0_, double p_181159_2_)`
`static double`	`func_181160_c(double p_181160_0_, double p_181160_2_, double p_181160_4_)`
`static double`	`func_181161_i(double p_181161_0_)`
`static double`	`func_181162_h(double p_181162_0_)`
`static int`	`func_181758_c(float p_181758_0_, float p_181758_1_, float p_181758_2_)`
`static long`	`getCoordinateRandom(int x, int y, int z)`
`static long`	`getPositionRandom(Vec3i pos)`
`static double`	`getRandomDoubleInRange(java.util.Random p_82716_0_, double p_82716_1_, double p_82716_3_)`
`static int`	`getRandomIntegerInRange(java.util.Random p_76136_0_, int p_76136_1_, int p_76136_2_)`
`static java.util.UUID`	`getRandomUuid(java.util.Random rand)`
`private static boolean`	`isPowerOfTwo(int value)` Is the given value a power of two? (1, 2, 4, 8, 16, ...)
`static int`	`normalizeAngle(int p_180184_0_, int p_180184_1_)`
`static double`	`parseDoubleWithDefault(java.lang.String p_82712_0_, double p_82712_1_)` parses the string as double or returns the second parameter if it fails.
`static double`	`parseDoubleWithDefaultAndMax(java.lang.String p_82713_0_, double p_82713_1_, double p_82713_3_)`
`static int`	`parseIntWithDefault(java.lang.String p_82715_0_, int p_82715_1_)` parses the string as integer or returns the second parameter if it fails
`static int`	`parseIntWithDefaultAndMax(java.lang.String p_82714_0_, int p_82714_1_, int p_82714_2_)` parses the string as integer or returns the second parameter if it fails.
`static float`	`randomFloatClamp(java.util.Random p_151240_0_, float p_151240_1_, float p_151240_2_)`
`static int`	`roundUpToPowerOfTwo(int value)` Returns the input value rounded up to the next highest power of two.
`static float`	`sin(float p_76126_0_)` sin looked up in a table
`static float`	`sqrt_double(double value)`
`static float`	`sqrt_float(float value)`
`static int`	`truncateDoubleToInt(double value)` returns par0 cast as an int, and no greater than Integer.MAX_VALUE-1024
`static double`	`wrapAngleTo180_double(double value)` the angle is reduced to an angle between -180 and +180 by mod, and a 360 check
`static float`	`wrapAngleTo180_float(float value)` the angle is reduced to an angle between -180 and +180 by mod, and a 360 check

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- SQRT_2
```
public static final float SQRT_2
```
- SIN_TABLE
```
private static final float[] SIN_TABLE
```
  A table of sin values computed from 0 (inclusive) to 2*pi (exclusive), with steps of 2*PI / 65536.
- multiplyDeBruijnBitPosition
```
private static final int[] multiplyDeBruijnBitPosition
```
  Though it looks like an array, this is really more like a mapping. Key (index of this array) is the upper 5 bits of the result of multiplying a 32-bit unsigned integer by the B(2, 5) De Bruijn sequence 0x077CB531. Value (value stored in the array) is the unique index (from the right) of the leftmost one-bit in a 32-bit unsigned integer that can cause the upper 5 bits to get that value. Used for highly optimized "find the log-base-2 of this number" calculations.
- field_181163_d
```
private static final double field_181163_d
```
- field_181164_e
```
private static final double[] field_181164_e
```
- field_181165_f
```
private static final double[] field_181165_f
```

Constructor Detail
- MathHelper
```
public MathHelper()
```

Method Detail

sin

public static float sin(float p_76126_0_)

sin looked up in a table

cos
```
public static float cos(float value)
```
cos looked up in the sin table with the appropriate offset

sqrt_float

public static float sqrt_float(float value)

sqrt_double

public static float sqrt_double(double value)

floor_float
```
public static int floor_float(float value)
```
Returns the greatest integer less than or equal to the float argument

truncateDoubleToInt
```
public static int truncateDoubleToInt(double value)
```
returns par0 cast as an int, and no greater than Integer.MAX_VALUE-1024

floor_double
```
public static int floor_double(double value)
```
Returns the greatest integer less than or equal to the double argument

floor_double_long

public static long floor_double_long(double value)

Long version of floor_double

func_154353_e

public static int func_154353_e(double value)

abs
```
public static float abs(float value)
```

abs_int
```
public static int abs_int(int value)
```
Returns the unsigned value of an int.

ceiling_float_int

public static int ceiling_float_int(float value)

ceiling_double_int

public static int ceiling_double_int(double value)

clamp_int
```
public static int clamp_int(int num,
                            int min,
                            int max)
```
Returns the value of the first parameter, clamped to be within the lower and upper limits given by the second and third parameters.

clamp_float
```
public static float clamp_float(float num,
                                float min,
                                float max)
```
Returns the value of the first parameter, clamped to be within the lower and upper limits given by the second and third parameters

clamp_double

public static double clamp_double(double num,
                                  double min,
                                  double max)

denormalizeClamp

public static double denormalizeClamp(double p_151238_0_,
                                      double p_151238_2_,
                                      double p_151238_4_)

abs_max

public static double abs_max(double p_76132_0_,
                             double p_76132_2_)

Maximum of the absolute value of two numbers.

bucketInt

public static int bucketInt(int p_76137_0_,
                            int p_76137_1_)

Buckets an integer with specifed bucket sizes. Args: i, bucketSize

getRandomIntegerInRange

public static int getRandomIntegerInRange(java.util.Random p_76136_0_,
                                          int p_76136_1_,
                                          int p_76136_2_)

randomFloatClamp

public static float randomFloatClamp(java.util.Random p_151240_0_,
                                     float p_151240_1_,
                                     float p_151240_2_)

getRandomDoubleInRange

public static double getRandomDoubleInRange(java.util.Random p_82716_0_,
                                            double p_82716_1_,
                                            double p_82716_3_)

average

public static double average(long[] values)

epsilonEquals

public static boolean epsilonEquals(float p_180185_0_,
                                    float p_180185_1_)

normalizeAngle

public static int normalizeAngle(int p_180184_0_,
                                 int p_180184_1_)

wrapAngleTo180_float
```
public static float wrapAngleTo180_float(float value)
```
the angle is reduced to an angle between -180 and +180 by mod, and a 360 check

wrapAngleTo180_double
```
public static double wrapAngleTo180_double(double value)
```
the angle is reduced to an angle between -180 and +180 by mod, and a 360 check

parseIntWithDefault

public static int parseIntWithDefault(java.lang.String p_82715_0_,
                                      int p_82715_1_)

parses the string as integer or returns the second parameter if it fails

parseIntWithDefaultAndMax

public static int parseIntWithDefaultAndMax(java.lang.String p_82714_0_,
                                            int p_82714_1_,
                                            int p_82714_2_)

parses the string as integer or returns the second parameter if it fails. this value is capped to par2

parseDoubleWithDefault

public static double parseDoubleWithDefault(java.lang.String p_82712_0_,
                                            double p_82712_1_)

parses the string as double or returns the second parameter if it fails.

parseDoubleWithDefaultAndMax

public static double parseDoubleWithDefaultAndMax(java.lang.String p_82713_0_,
                                                  double p_82713_1_,
                                                  double p_82713_3_)

roundUpToPowerOfTwo
```
public static int roundUpToPowerOfTwo(int value)
```
Returns the input value rounded up to the next highest power of two.

isPowerOfTwo
```
private static boolean isPowerOfTwo(int value)
```
Is the given value a power of two? (1, 2, 4, 8, 16, ...)

calculateLogBaseTwoDeBruijn
```
private static int calculateLogBaseTwoDeBruijn(int value)
```
Uses a B(2, 5) De Bruijn sequence and a lookup table to efficiently calculate the log-base-two of the given value. Optimized for cases where the input value is a power-of-two. If the input value is not a power-of-two, then subtract 1 from the return value.

calculateLogBaseTwo
```
public static int calculateLogBaseTwo(int value)
```
Efficiently calculates the floor of the base-2 log of an integer value. This is effectively the index of the highest bit that is set. For example, if the number in binary is 0...100101, this will return 5.

func_154354_b

public static int func_154354_b(int p_154354_0_,
                                int p_154354_1_)

func_180183_b

public static int func_180183_b(float p_180183_0_,
                                float p_180183_1_,
                                float p_180183_2_)

func_180181_b

public static int func_180181_b(int p_180181_0_,
                                int p_180181_1_,
                                int p_180181_2_)

func_180188_d

public static int func_180188_d(int p_180188_0_,
                                int p_180188_1_)

func_181162_h

public static double func_181162_h(double p_181162_0_)

getPositionRandom

public static long getPositionRandom(Vec3i pos)

getCoordinateRandom

public static long getCoordinateRandom(int x,
                                       int y,
                                       int z)

getRandomUuid

public static java.util.UUID getRandomUuid(java.util.Random rand)

func_181160_c

public static double func_181160_c(double p_181160_0_,
                                   double p_181160_2_,
                                   double p_181160_4_)

func_181159_b

public static double func_181159_b(double p_181159_0_,
                                   double p_181159_2_)

func_181161_i

public static double func_181161_i(double p_181161_0_)

func_181758_c

public static int func_181758_c(float p_181758_0_,
                                float p_181758_1_,
                                float p_181758_2_)

Class MathHelper

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SQRT_2

SIN_TABLE

multiplyDeBruijnBitPosition

field_181163_d

field_181164_e

field_181165_f

Constructor Detail