java.awt.geom
Class Point2D

java.lang.Object
  java.awt.geom.Point2D

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

Point, Point2D.Double, Point2D.Float

public abstract class Point2D
extends Object
implements Cloneable

An abstract class for a point. Subclasses implement float, double and integer coordinates.

Author:

Lawrie Griffiths

Nested Class Summary

static class	Point2D.Double A point with double coordinates.
static class	Point2D.Float A point with float coordinates.

Constructor Summary

protected

Point2D() This is abstract class that cannot be instantiated.

Method Summary

Object	clone() Create a copy of this object, using a shallow copy.
double	distance(double px, double py) Get the distance from this point to a given point as a double
static double	distance(double x1, double y1, double x2, double y2) Get the the distance between two points
double	distance(Point2D pt) Get the distance from this point to a given point asa double
double	distanceSq(double px, double py) Get the square of the distance between two points
static double	distanceSq(double x1, double y1, double x2, double y2) Get the square of the distance between two points
double	distanceSq(Point2D pt) Get the square of the distance of this point to a given point
boolean	equals(Object obj) Test if this point is equal to a given object
abstract double	getX() Get the x coordinate as a double
abstract double	getY() Get the y coordinate as a double
abstract void	setLocation(double x, double y) Set the location of this Point2D using double coordinates
void	setLocation(Point2D p) Set the location of this Point2D to the same as a specified Point2D

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Point2D

protected Point2D()

This is abstract class that cannot be instantiated. Use one of its subclasses.

Method Detail

getX

public abstract double getX()

Get the x coordinate as a double

Returns:

the x co-ordinate (as a double)

getY

public abstract double getY()

Get the y coordinate as a double

Returns:

the y coordinate (as a double)

setLocation

public abstract void setLocation(double x,
                                 double y)

Set the location of this Point2D using double coordinates

Parameters:

x - the new x coordinate

y - the new y coordinate

setLocation

public void setLocation(Point2D p)

Set the location of this Point2D to the same as a specified Point2D

Parameters:

p - the specified Point2D

distanceSq

public static double distanceSq(double x1,
                                double y1,
                                double x2,
                                double y2)

Get the square of the distance between two points

Parameters:

x1 - the x coordinate of the first point

y1 - the y coordinate of the first point

x2 - the x coordinate of the second point

y2 - the y coordinate of the second point

Returns:

the square of the distance between the points as a double

distance

public static double distance(double x1,
                              double y1,
                              double x2,
                              double y2)

Get the the distance between two points

Parameters:

x1 - the x coordinate of the first point

y1 - the y coordinate of the first point

x2 - the x coordinate of the second point

y2 - the y coordinate of the second point

Returns:

the distance between the points as a double

distanceSq

public double distanceSq(double px,
                         double py)

Get the square of the distance between two points

Parameters:

px - the first point

py - the second point

Returns:

the square of the distance between the points as a double

distanceSq

public double distanceSq(Point2D pt)

Get the square of the distance of this point to a given point

Parameters:

pt - the given point

Returns:

the square of the distance to the given point as a double

distance

public double distance(double px,
                       double py)

Get the distance from this point to a given point as a double

Parameters:

px - the x coordinate of the given point

py - the y coordinate of the given point

Returns:

the distance to the given point as a double

distance

public double distance(Point2D pt)

Get the distance from this point to a given point asa double

Parameters:

pt - the given point

Returns:

the distance to the given point as a double

equals

public boolean equals(Object obj)

Test if this point is equal to a given object

Overrides:

equals in class Object

clone

public Object clone()

Description copied from class: Object

Create a copy of this object, using a shallow copy.

Overrides:

clone in class Object

Returns:

The new copy of the Object