edu.colorado.geometry

Class Location

java.lang.Object

edu.colorado.geometry.Location

All Implemented Interfaces:

java.lang.Cloneable

public class Location
extends java.lang.Object
implements java.lang.Cloneable

A Location object keeps track of a location on a two-dimensional plane.

See Also:

Java Source Code for this class (www.cs.colorado.edu/~main/edu/colorado/geometry/Location.java)

Constructor Summary

Constructors

Constructor and Description
Location(double xInitial, double yInitial) Construct a Location with specified coordinates.

Method Summary

Modifier and Type	Method and Description
Location	clone() Generate a copy of this Location.
static double	distance(Location p1, Location p2) Compute the distance between two Locations.
boolean	equals(java.lang.Object obj) Compare this Location to another object for equality.
double	getX() Get the x coordinate of this Location.
double	getY() Get the y coordinate of this Location.
static Location	midpoint(Location p1, Location p2) Generate and return a Location halfway between two others.
void	rotate90() Rotate this Location 90 degrees in a clockwise direction.
void	shift(double xAmount, double yAmount) Move this Location by given amounts along the x and y axes.
java.lang.String	toString() Generate a String representation of this Location.

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Location

public Location(double xInitial,
                double yInitial)

Construct a Location with specified coordinates.

Parameters:

xInitial - the initial x coordinate of this Location

yInitial - the initial y coordinate of this Location

Postcondition:

This Location has been initialized at the given coordinates.

Method Detail

clone

public Location clone()

Generate a copy of this Location.

Overrides:

clone in class java.lang.Object

Returns:

The return value is a copy of this Location. Subsequent changes to the copy will not affect the original, nor vice versa. Note that the return value is a Location (not a plain Object) which is permitted with Java 5.0.

distance

public static double distance(Location p1,
                              Location p2)

Compute the distance between two Locations.

Parameters:

p1 - the first Location

p2 - the second Location

Returns:

the distance between p1 and p2

Note:

The answer is Double.POSITIVE_INFINITY if the distance calculation overflows. The answer is Double.NaN if either Location is null.

equals

public boolean equals(java.lang.Object obj)

Compare this Location to another object for equality.

Overrides:

equals in class java.lang.Object

Parameters:

obj - an object with which this Location will be compared

Returns:

A return value of true indicates that obj refers to a Location object with the same value as this Location. Otherwise the return value is false.

Note:

If obj is null or does not refer to a Location object, then the answer is false.

getX

public double getX()

Get the x coordinate of this Location.

Returns:

the x coordinate of this Location.

getY

public double getY()

Get the y coordinate of this Location.

Returns:

the y coordinate of this Location.

midpoint

public static Location midpoint(Location p1,
                                Location p2)

Generate and return a Location halfway between two others.

Parameters:

p1 - the first Location

p2 - the second Location

Returns:

a Location that is halfway between p1 and p2.

Note:

The answer is null if either p1 or p2 is null.

rotate90

public void rotate90()

Rotate this Location 90 degrees in a clockwise direction.

Postcondition:

This Location has been rotated clockwise 90 degrees around the origin.

shift

public void shift(double xAmount,
                  double yAmount)

Move this Location by given amounts along the x and y axes.

Parameters:

xAmount - the amount to move this Location along the x axis

yAmount - the amount to move this Location along the y axis

Postcondition:

This Location has been moved by the given amounts along the two axes.

Note:

The shift may cause a coordinate to go above Double.MAX_VALUE or below the minimum double value. In these cases, subsequent activations of getX or getY will return Double.POSITIVE_INFINITY or Double.NEGATIVE_INFINITY.

toString

public java.lang.String toString()

Generate a String representation of this Location.

Overrides:

toString in class java.lang.Object

Returns:

a String representation of this Location