danger.util
Class Fixed

java.lang.Object
  danger.util.Fixed

public class Fixed
extends Object

Fixed point math library. Precision is 16 bits whole, 16 bits fractional. Uses 32 bit values to represent the Fixed number.

Field Summary

static int	FIXED_ONE
static int	FIXED_ONE_HALF
static int	FIXED_PI
static int	FIXED_TWO
static int	MAX_VALUE

Constructor Summary

Fixed()

Method Summary

static int	abs(int value) return absolute value of a fixed point number
static int	add(int fvalue1, int fvalue2) add two fixed point values together
static int	cos(int angle) angle = 0-359 degrees.
static int	cosf(int fAngle) fAngle = 0-359 in fixed point.
static int	divide(int dividend, int divisor) divide a fixed point value by a fixed point value dividend - number to divide "into" divisor - number to divide "by" If divisor is 0 (zero), then an ArithmeticException is thrown.
static int	floor(int fValue) Given a signed fixed point value, and return the nearest integer.
static int	fromInt(int value) given an integer value, return a fixed point value
static int	fromReal(int whole, int dividend, int divisor) create fixed point value from real expression.
static int	getFraction(int fValue) given a fixed point value, return the fraction part
static int	hypot(int x, int y) Returns sqrt(x**2 + y**2), the hypotenuse of a right-angled triangle with sides x and y.
static int	multiply(int factor1, int factor2) sign multiply two fixed point values together and return a fixed point value reference - http://www.embedded.com/2001/0104/0104feat1list2.htm
static int	round(int fValue) Round to nearest fixed point value.
static int	sin(int angle) angle = 0-359 degrees.
static int	sinf(int fAngle) fAngle = 0-359 in fixed point.
static int	sqrt(int fValue) Returns square root of fixed value Throws Arithmetic Exception if (fValue < 0) This is not accurate, but faster than Math.sqrt()
static int	subtract(int fvalue1, int fvalue2) subtract two fixed point values
void	testCosSin() Deprecated. For internal use only.
static void	testSqrt() Deprecated. For internal use only.
static int	toInt(int fvalue) given a fixed point value, return an integer

Methods inherited from class java.lang.Object

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

Field Detail

FIXED_ONE

public static final int FIXED_ONE

See Also:

Constant Field Values

FIXED_TWO

public static final int FIXED_TWO

See Also:

Constant Field Values

FIXED_PI

public static final int FIXED_PI

See Also:

Constant Field Values

MAX_VALUE

public static final int MAX_VALUE

See Also:

Constant Field Values

FIXED_ONE_HALF

public static final int FIXED_ONE_HALF

See Also:

Constant Field Values

Constructor Detail

Fixed

public Fixed()

Method Detail

fromInt

public static int fromInt(int value)

given an integer value, return a fixed point value

toInt

public static int toInt(int fvalue)

given a fixed point value, return an integer

getFraction

public static int getFraction(int fValue)

given a fixed point value, return the fraction part

fromReal

public static int fromReal(int whole,
                           int dividend,
                           int divisor)

create fixed point value from real expression. ie. 5 3/4 would be 5, 3, 4 pi 3.14 would be 0, 22, 7

abs

public static int abs(int value)

return absolute value of a fixed point number

divide

public static int divide(int dividend,
                         int divisor)

divide a fixed point value by a fixed point value dividend - number to divide "into" divisor - number to divide "by" If divisor is 0 (zero), then an ArithmeticException is thrown.

add

public static int add(int fvalue1,
                      int fvalue2)

add two fixed point values together

subtract

public static int subtract(int fvalue1,
                           int fvalue2)

subtract two fixed point values

multiply

public static int multiply(int factor1,
                           int factor2)

sign multiply two fixed point values together and return a fixed point value reference - http://www.embedded.com/2001/0104/0104feat1list2.htm

sinf

public static int sinf(int fAngle)

fAngle = 0-359 in fixed point. Returns 16.16 value

cosf

public static int cosf(int fAngle)

fAngle = 0-359 in fixed point. Returns 16.16 value

sin

public static int sin(int angle)

angle = 0-359 degrees. Returns 16.16 value

cos

public static int cos(int angle)

angle = 0-359 degrees. Returns 16.16 value

floor

public static int floor(int fValue)

Given a signed fixed point value, and return the nearest integer. Returns an integer.

round

public static int round(int fValue)

Round to nearest fixed point value. Returns a fixed value

hypot

public static int hypot(int x,
                        int y)

Returns sqrt(x**2 + y**2), the hypotenuse of a right-angled triangle with sides x and y. hypot(3<<16, 4<<16) => 5<<16 Throws IllegalArgumentException if ((x|y) < 0) || (x > 0x800000) || (y > 0x800000)

sqrt

public static int sqrt(int fValue)

Returns square root of fixed value Throws Arithmetic Exception if (fValue < 0) This is not accurate, but faster than Math.sqrt()

testCosSin

public void testCosSin()

Deprecated. For internal use only.

testSqrt

public static void testSqrt()

Deprecated. For internal use only.