Class Point2D

public abstract class Point2D
extends Object
implements Cloneable

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.

Constructors

Point2D

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.

Since:

1.2

See Also:

Point2D.Float, Point2D.Double, Point

Methods

getX

public abstract double getX()

Returns the X coordinate of this Point2D in double precision.

Returns:

the X coordinate of this Point2D.

Since:

1.2

getY

public abstract double getY()

Returns the Y coordinate of this Point2D in double precision.

Returns:

the Y coordinate of this Point2D.

Since:

1.2

setLocation

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

Since:

1.2

setLocation

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

Since:

1.2

distanceSq

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.

Since:

1.2

distance

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.

Since:

1.2

distanceSq

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.

Since:

1.2

distanceSq

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.

Since:

1.2

distance

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.

Since:

1.2

distance

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.

Since:

1.2

clone

public Object clone()

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

Overrides:

clone in class Object

Returns:

a clone of this instance.

Throws:

OutOfMemoryError - if there is not enough memory.

Since:

1.2

See Also:

Cloneable

hashCode

public int hashCode()

Returns the hashcode for this Point2D.

Overrides:

hashCode in class Object

Returns:

a hash code for this Point2D.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

equals

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.

Overrides:

equals in class Object

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.

Since:

1.2

See Also:

Object.hashCode(), HashMap