Package com.google.zxing.common.detector

Class MathUtils

java.lang.Object

com.google.zxing.common.detector.MathUtils

public final class MathUtils
extends java.lang.Object

General math-related and numeric utility functions.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MathUtils()

Method Summary

Modifier and Type	Method	Description
static float	distance(float aX, float aY, float bX, float bY)
static float	distance(int aX, int aY, int bX, int bY)
static int	round(float d)	Ends up being a bit faster than Math.round(float).
static int	sum(int[] array)

Methods inherited from class java.lang.Object

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

Constructor Detail

MathUtils

private MathUtils()

Method Detail

round

public static int round(float d)

Ends up being a bit faster than Math.round(float). This merely rounds its argument to the nearest int, where x.5 rounds up to x+1. Semantics of this shortcut differ slightly from Math.round(float) in that half rounds down for negative values. -2.5 rounds to -3, not -2. For purposes here it makes no difference.

Parameters:

d - real value to round

Returns:

nearest int

distance

public static float distance(float aX,
                             float aY,
                             float bX,
                             float bY)

Parameters:

aX - point A x coordinate

aY - point A y coordinate

bX - point B x coordinate

bY - point B y coordinate

Returns:

Euclidean distance between points A and B

distance

public static float distance(int aX,
                             int aY,
                             int bX,
                             int bY)

Parameters:

aX - point A x coordinate

aY - point A y coordinate

bX - point B x coordinate

bY - point B y coordinate

Returns:

Euclidean distance between points A and B

sum

public static int sum(int[] array)

Parameters:

array - values to sum

Returns:

sum of values in array