Class Line

java.lang.Object
  Line

public class Line
extends Object

This class models a line in a two-dimensional space.

Author:

CS133 Staff

Constructor Summary

Line(double slope, double yIntercept)
Constructs a Line by initializing the slope and yIntercept instance variables.

Method Summary

double	evaluateAt(double xPosition) Treats this Line as a function and evaluates its y-value at the x-value given.
double	getSlope() Returns the slope of this Line.
double	getXIntercept() Returns the x-intercept of this Line.
double	getYIntercept() Returns the y-intercept of this Line.
void	invert() Changes this line to be its reflection in the line y = x.
void	shiftVertical(int yShift) Changes the position of this Line by shifting it yShift units vertically
String	toString() Returns a String representation of this Line in y = mx + b format where m is the slope and b is the y-intercept.

Methods inherited from class java.lang.Object

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

Constructor Detail

Line

public Line(double slope,
            double yIntercept)

Constructs a Line by initializing the slope and yIntercept instance variables.

Parameters:

slope - The slope of this Line.

yIntercept - The y-coordinate of the y-intercept of this Line.

Method Detail

getXIntercept

public double getXIntercept()

Returns the x-intercept of this Line.

Returns:

This Line's x-intercept.

getYIntercept

public double getYIntercept()

Returns the y-intercept of this Line.

Returns:

This Line's y-intercept.

getSlope

public double getSlope()

Returns the slope of this Line.

Returns:

This Line's slope.

toString

public String toString()

Returns a String representation of this Line in y = mx + b format where m is the slope and b is the y-intercept.

Overrides:

toString in class Object

Returns:

The equation of this Line.

shiftVertical

public void shiftVertical(int yShift)

Changes the position of this Line by shifting it yShift units vertically

Parameters:

yShift - The number of units to shift the Line.

invert

public void invert()

Changes this line to be its reflection in the line y = x.

evaluateAt

public double evaluateAt(double xPosition)

Treats this Line as a function and evaluates its y-value at the x-value given.

Parameters:

xPosition - The x-value at which to evaluate the function.

Returns:

The value of y when this Line passes through xPosition.