sjm.utensil
Class LinearCalculator

java.lang.Object
  |
  +--sjm.utensil.LinearCalculator

Direct Known Subclasses:

LimitingLinearCalculator

public class LinearCalculator

extends java.lang.Object

A LinearCalculator models two variables that vary linearly with each other. For example, Fahrenheit and Celsius temperate scales vary linearly. Fahrenheit temperature varies from 32 to 212 as Celsius varies 0 to 100. A LinearCalculator can model the whole scale, if it is created as:

 
     LinearCalculator lc = 
         new LinearCalculator(32, 212, 0, 100);
     System.out.println(lc.calculateYforGivenX(68));

  

Version:

1.0

Author:

Steven J. Metsker

Field Summary

(package private) double	xFrom
(package private) double	xTo
(package private) double	yFrom
(package private) double	yTo

Constructor Summary

LinearCalculator(double xFrom, double xTo, double yFrom, double yTo)
Create a LinearCalculator from known points on two scales.

Method Summary

double	calculateXforGivenY(double y) Return the value on the first scale, corresponding to the given value on the second scale.
double	calculateYforGivenX(double x) Return the value on the second scale, corresponding to the given value on the first scale.
static void	main(java.lang.String[] args) Show the example in the class comment.
java.lang.String	toString() Return a textual description of this object.

Methods inherited from class java.lang.Object

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

Field Detail

xFrom

double xFrom

xTo

double xTo

yFrom

double yFrom

yTo

double yTo

Constructor Detail

LinearCalculator

public LinearCalculator(double xFrom,
                        double xTo,
                        double yFrom,
                        double yTo)

Create a LinearCalculator from known points on two scales.

Parameters:

double - xFrom

double - xTo

double - yFrom

double - yTo

Method Detail

calculateXforGivenY

public double calculateXforGivenY(double y)

Return the value on the first scale, corresponding to the given value on the second scale.

Returns:

the value on the first scale, corresponding to the given value on the second scale

calculateYforGivenX

public double calculateYforGivenX(double x)

Return the value on the second scale, corresponding to the given value on the first scale.

Returns:

the value on the second scale, corresponding to the given value on the first scale

main

public static void main(java.lang.String[] args)

Show the example in the class comment.

Parameters:

args - ignored.

toString

public java.lang.String toString()

Return a textual description of this object.

Overrides:

toString in class java.lang.Object

Returns:

a textual description of this object