freeresponse2010
Class APLine

java.lang.Object
  freeresponse2010.APLine

public class APLine
extends java.lang.Object

Encapsulates a line of the form ax + by + c = 0, where a, b and c are integers, and a and b are non-zero. This is a sample solution to free response question #2 on the AP Computer Science 2010 exam.

Field Summary

private int	aaa_ Coefficient for the x term in ax + by + c = 0.
private int	bbb_ Coefficient for the y term in ax + by + c = 0.
private int	ccc_ c term in ax + by + c = 0.

Constructor Summary

APLine(int aaa, int bbb, int ccc)
Constructs an object representing a line in the form ax + by = c.

Method Summary

double	getSlope() Gets the slope of the encapsulated line.
boolean	isOnLine(int xco, int yco) Determines whether a point is on the encapsulated line.
java.lang.String	toString() Returns a string representation of the encapsulated line.

Methods inherited from class java.lang.Object

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

Field Detail

aaa_

private int aaa_

Coefficient for the x term in ax + by + c = 0.

bbb_

private int bbb_

Coefficient for the y term in ax + by + c = 0.

ccc_

private int ccc_

c term in ax + by + c = 0.

Constructor Detail

APLine

public APLine(int aaa,
              int bbb,
              int ccc)

Constructs an object representing a line in the form ax + by = c.

Parameters:

aaa - Coefficient for the x term in ax + by + c = 0.

bbb - Coefficient for the x term in ax + by + c = 0.

ccc - c term in ax + by + c = 0.

Precondition:

s != 0, b != 0

Method Detail

getSlope

public double getSlope()

Gets the slope of the encapsulated line.

Returns:

The slope of the encapsulated line.

isOnLine

public boolean isOnLine(int xco,
                        int yco)

Determines whether a point is on the encapsulated line.

Parameters:

xco - x coordinate of point to test.

yco - y-coordinate of point to test.

Returns:

true if the point is on the line, false otherwise.

toString

public java.lang.String toString()

Returns a string representation of the encapsulated line. Not a part of the AP specification; added to facilitate testing.

Overrides:

toString in class java.lang.Object