sjm.examples.sling
Class Abs

java.lang.Object
  |
  +--sjm.examples.sling.SlingFunction
        |
        +--sjm.examples.sling.Abs

public class Abs

extends SlingFunction

This class wraps an absolute value function around another source function.

The absolute value of x is just x if x is positive, and is –x if x is negative.

Fields inherited from class sjm.examples.sling.SlingFunction

source

Constructor Summary

Abs()
Constructs abs(t).

Abs(SlingFunction source)
Constructs a function object that wraps an abs function around the given source function.

Method Summary

Point	f(double t) Returns, essentially, abs(source.f(t)).
java.lang.String	toString() Returns a string representation of this function.

Methods inherited from class sjm.examples.sling.SlingFunction

eval, extrema, fresh

Methods inherited from class java.lang.Object

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

Constructor Detail

Abs

public Abs()

Constructs abs(t).

Abs

public Abs(SlingFunction source)

Constructs a function object that wraps an abs function around the given source function.

Method Detail

f

public Point f(double t)

Returns, essentially, abs(source.f(t)).

Subclasses of SlingFunction return a 2D point from the f() method. The abs function needs only one argument from its source, not a whole point. This method ignores the x component of the source's f(t) value, and uses the y component as an argument to Math.abs.

The Math.abs function returns a single number, so this method uses t as the x component of the constant that it returns. Thus the return value is:

    new Point(t, Math.abs(source.f(t).y)) 
 

Overrides:

f in class SlingFunction

Parameters:

t - a number that represents how far along a plot is, and thus tells which point to return

Returns:

a new point: (t, abs(source.f(t).y))

toString

public java.lang.String toString()

Returns a string representation of this function.

Overrides:

toString in class java.lang.Object