All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class berkeley.cs.dmc.rapid2d.FixedPt

java.lang.Object
   |
   +----berkeley.cs.dmc.rapid2d.FixedPt

public final class FixedPt
extends Object

The FixedPt is a class for doing fixed point arithmetic. It is NOT a class for fixed point numbers. The actual fixed point numbers are stored in integers and add, subtracted, multiplied, etc... using the routines of the fixed point. This may lead to confusion between integers and fixed point values, but um... deal with it.

int a, b;
a = FixedPt.toFixed( 100 );
b = FixedPt.toFixed( 1.25 );
System.out.println( "100 * 1.25 = " + FixedPt.toString( FixedPt.mul( a, b ) ) );

fractMask
HALF: Fixed point for 0.5.
intMask
ONE: Fixed point for 1.
SHIFT
ZERO: Fixed point for 0.

FixedPt()

abs(int)
acos(int)
add(int, int): Adds two fixed point values.
asin(int)
atan(int)
atan2(int, int)
ceil(int): Rounds a fixed point value to the largest integer less than or equal.
cos(int)
div(int, int): Divides two fixed point values
divByInt(int, int): Divides a fixed point value by an integer
exp(int)
floor(int): Rounds a fixed point value to the smallest integer greater than or equal.
fract(int): Returns the fractional potion of a fixed point value.
log(int)
max(int, int)
min(int, int)
mul(int, int): Multiplies two fixed point values
neg(int): Negates a fixed point value.
pow(int, int)
round(int): Rounds a fixed point value to the nearest integer
sin(int)
sqrt(int): Returns the square root of an integer.
sub(int, int): Subtracts two fixed point values.
tan(int)
toDouble(int): Returns a double representation of a fixed point value
toFixed(double): Converts a double to a fixed point value.
toFixed(float): Converts a float to a fixed point value.
toFixed(int): Converts an integer to a fixed point value.
toFloat(int): Returns a floating point representation of a fixed point value
toString(int): Returns a string of the form "1 23/256" where 1 is the integer part, 23 is the fractional part, and 256 is the denominator.
trunc(int): Truncates a fixed point value to an integer.

SHIFT

 public static final int SHIFT

ONE

 public static final int ONE

Fixed point for 1. Equivalent to toFixed(1)

ZERO

 public static final int ZERO

Fixed point for 0. Equivalent to toFixed(0)

HALF

 public static final int HALF

Fixed point for 0.5. Equivalent to toFixed(0.5)

fractMask

 public static final int fractMask

intMask

 public static final int intMask

FixedPt

 public FixedPt()

trunc

 public static final int trunc(int a)

Truncates a fixed point value to an integer.

Parameters:: a - fixed point
Returns:: integer

round

 public static final int round(int a)

Rounds a fixed point value to the nearest integer

Parameters:: a - fixed point
Returns:: integer

fract

 public static final int fract(int a)

Returns the fractional potion of a fixed point value.

Parameters:: a - fixed point
Returns:: fixed point

ceil

 public static final int ceil(int a)

Rounds a fixed point value to the largest integer less than or equal.

Parameters:: a - fixed point
Returns:: fixed point

floor

 public static final int floor(int a)

Rounds a fixed point value to the smallest integer greater than or equal.

Parameters:: a - fixed point
Returns:: fixed point

toFloat

 public static final float toFloat(int a)

Returns a floating point representation of a fixed point value

Parameters:: a - fixed point
Returns:: value as a float

toDouble

 public static final double toDouble(int a)

Returns a double representation of a fixed point value

Parameters:: a - fixed point
Returns:: the value as a double

toFixed

 public static final int toFixed(int a)

Converts an integer to a fixed point value.

Parameters:: a - integer
Returns:: fixed point

toFixed

 public static final int toFixed(float a)

Converts a float to a fixed point value.

Parameters:: a - float
Returns:: fixed point

toFixed

 public static final int toFixed(double a)

Converts a double to a fixed point value.

Parameters:: a - double
Returns:: fixed point

add

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

Adds two fixed point values. Addition may also be done using the '+' operator on the integers representing fixed points.

Parameters:: a - fixed point; b - fixed point
Returns:: fixed point

sub

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

Subtracts two fixed point values. Subtraction may also be done with the '-' operator.

Parameters:: a - fixed point; b - fixed point
Returns:: fixed point

neg

 public static final int neg(int a)

Negates a fixed point value. Negation may also be done with the unary '-' operator.

Parameters:: a - fixed point
Returns:: fixed point

mul

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

Multiplies two fixed point values

Parameters:: a - fixed point; b - fixed point
Returns:: fixed point

div

 public static final int div(int n,
                             int d)

Divides two fixed point values

Parameters:: a - fixed point; b - fixed point
Returns:: fixed point

divByInt

 public static final int divByInt(int n,
                                  int di)

Divides a fixed point value by an integer

Parameters:: a - fixed point; b - integer
Returns:: fixed point

abs

 public static final int abs(int a)

acos

 public static final int acos(int a)

asin

 public static final int asin(int a)

atan

 public static final int atan(int a)

atan2

 public static final int atan2(int a,
                               int b)

cos

 public static final int cos(int a)

exp

 public static final int exp(int a)

log

 public static final int log(int a)

max

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

min

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

pow

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

sin

 public static final int sin(int a)

tan

 public static final int tan(int a)

sqrt

 public static final int sqrt(int a)

Returns the square root of an integer. A negative parameter will cause an ArithmeticException.

Parameters:: a - fixed point
Returns:: the square root (fixed point)

toString

 public static final String toString(int a)

Returns a string of the form "1 23/256" where 1 is the integer part, 23 is the fractional part, and 256 is the denominator.

Parameters:: a - FixedPt int value
Returns:: the string representation of the parameter

All Packages  Class Hierarchy  This Package  Previous  Next  Index