public abstract class

Point2D

extends Object
implements Cloneable
java.lang.Object
   ↳ java.awt.geom.Point2D
Known Direct Subclasses

Class Overview

The Point2D class defines a point representing a location in (x,y) coordinate space.

This class is only the abstract superclass for all objects that store a 2D coordinate. The actual storage representation of the coordinates is left to the subclass.

Summary

Nested Classes
class Point2D.Double The Double class defines a point specified in double precision. 
class Point2D.Float The Float class defines a point specified in float precision. 
Protected Constructors
Point2D()
This is an abstract class that cannot be instantiated directly.
Public Methods
Object clone()
Creates a new object of the same class and with the same contents as this object.
double distance(Point2D pt)
Returns the distance from this Point2D to a specified Point2D.
static double distance(double x1, double y1, double x2, double y2)
Returns the distance between two points.
double distance(double px, double py)
Returns the distance from this Point2D to a specified point.
double distanceSq(Point2D pt)
Returns the square of the distance from this Point2D to a specified Point2D.
double distanceSq(double px, double py)
Returns the square of the distance from this Point2D to a specified point.
static double distanceSq(double x1, double y1, double x2, double y2)
Returns the square of the distance between two points.
boolean equals(Object obj)
Determines whether or not two points are equal.
abstract double getX()
Returns the X coordinate of this Point2D in double precision.
abstract double getY()
Returns the Y coordinate of this Point2D in double precision.
int hashCode()
Returns the hashcode for this Point2D.
abstract void setLocation(double x, double y)
Sets the location of this Point2D to the specified double coordinates.
void setLocation(Point2D p)
Sets the location of this Point2D to the same coordinates as the specified Point2D object.
[Expand]
Inherited Methods
From class java.lang.Object

Protected Constructors

protected Point2D ()

This is an abstract class that cannot be instantiated directly. Type-specific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessor methods below.

See Also

Public Methods

public Object clone ()

Creates a new object of the same class and with the same contents as this object.

Returns
  • a clone of this instance.
Throws
OutOfMemoryError if there is not enough memory.
See Also

public double distance (Point2D pt)

Returns the distance from this Point2D to a specified Point2D.

Parameters
pt the specified point to be measured against this Point2D
Returns
  • the distance between this Point2D and the specified Point2D.

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

Returns the distance between two points.

Parameters
x1 the X coordinate of the first specified point
y1 the Y coordinate of the first specified point
x2 the X coordinate of the second specified point
y2 the Y coordinate of the second specified point
Returns
  • the distance between the two sets of specified coordinates.

public double distance (double px, double py)

Returns the distance from this Point2D to a specified point.

Parameters
px the X coordinate of the specified point to be measured against this Point2D
py the Y coordinate of the specified point to be measured against this Point2D
Returns
  • the distance between this Point2D and a specified point.

public double distanceSq (Point2D pt)

Returns the square of the distance from this Point2D to a specified Point2D.

Parameters
pt the specified point to be measured against this Point2D
Returns
  • the square of the distance between this Point2D to a specified Point2D.

public double distanceSq (double px, double py)

Returns the square of the distance from this Point2D to a specified point.

Parameters
px the X coordinate of the specified point to be measured against this Point2D
py the Y coordinate of the specified point to be measured against this Point2D
Returns
  • the square of the distance between this Point2D and the specified point.

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

Returns the square of the distance between two points.

Parameters
x1 the X coordinate of the first specified point
y1 the Y coordinate of the first specified point
x2 the X coordinate of the second specified point
y2 the Y coordinate of the second specified point
Returns
  • the square of the distance between the two sets of specified coordinates.

public boolean equals (Object obj)

Determines whether or not two points are equal. Two instances of Point2D are equal if the values of their x and y member fields, representing their position in the coordinate space, are the same.

Parameters
obj an object to be compared with this Point2D
Returns
  • true if the object to be compared is an instance of Point2D and has the same values; false otherwise.

public abstract double getX ()

Returns the X coordinate of this Point2D in double precision.

Returns
  • the X coordinate of this Point2D.

public abstract double getY ()

Returns the Y coordinate of this Point2D in double precision.

Returns
  • the Y coordinate of this Point2D.

public int hashCode ()

Returns the hashcode for this Point2D.

Returns
  • a hash code for this Point2D.

public abstract void setLocation (double x, double y)

Sets the location of this Point2D to the specified double coordinates.

Parameters
x the new X coordinate of this Point2D
y the new Y coordinate of this Point2D

public void setLocation (Point2D p)

Sets the location of this Point2D to the same coordinates as the specified Point2D object.

Parameters
p the specified Point2D to which to set this Point2D