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Class EDU.emporia.mathtools.Point2D

Object
   |
   +----EDU.emporia.mathtools.Point2D

public abstract class Point2D

extends Object

implements Cloneable

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. (Note: We only include this in the package so that it can be used in versions of Java before 1.2)

Version:

10 Feb 1997

Author:

Jim Graham

EDU.emporia.mathtools.Point2D. Double

The Double class defines a point specified in double precision.

EDU.emporia.mathtools.Point2D. Float

The Float class defines a point specified in float precision.

EDU.emporia.mathtools.Point2D()

This is an abstract class that cannot be instantiated directly.

clone()

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

distance(double, double, double, double)

Returns the distance between two points.

distance(double, double)

Returns the distance from this Point2D to a specified point.

distance(Point2D)

Returns the distance from this Point2D to a specified Point2D.

distanceSq(double, double, double, double)

Returns the square of the distance between two points.

distanceSq(double, double)

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

distanceSq(Point2D)

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

equals(Object)

Determines whether or not two points are equal.

getX()

Returns the X coordinate of this Point2D in double precision.

getY()

Returns the Y coordinate of this Point2D in double precision.

hashCode()

Returns the hashcode for this Point2D.

setLocation(double, double)

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

setLocation(Point2D)

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

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:

Float, Double, Point

public java.lang.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.

Overrides:

clone in class Object

Since:

JDK1.2

See Also:

Cloneable

public static double distance(double X1,
                              double Y1,
                              double X2,
                              double Y2)

Returns the distance between two points.

Parameters:

X1, Y1 - the coordinates of the first point

X2, Y2 - the coordinates of the second 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, PY - the coordinates of the specified Point2D

Returns:

the distance between this Point2D and a specified point.

public double distance(Point2D pt)

Returns the distance from this Point2D to a specified Point2D.

Parameters:

pt - the specified Point2D

Returns:

the distance between this Point2D and the specified Point2D.

public static double distanceSq(double X1,
                                double Y1,
                                double X2,
                                double Y2)

Returns the square of the distance between two points.

Parameters:

X1, Y1 - the coordinates of the first point

X2, Y2 - the coordinates of the second point

Returns:

the square of the distance between the two sets of specified coordinates.

public double distanceSq(double PX,
                         double PY)

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

Parameters:

PX, PY - the coordinates of the other point

Returns:

the square of the distance between this Point2D and the specified point.

public double distanceSq(Point2D pt)

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

Parameters:

pt - the specified Point2D

Returns:

the square of the distance between this Point2D to a specified Point2D.

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.

Overrides:

equals in class Object

Since:

JDK1.2

public abstract double getX()

Returns the X coordinate of this Point2D in double precision.

Returns:

the X coordinate of this Point2D.

Since:

JDK1.2

public abstract double getY()

Returns the Y coordinate of this Point2D in double precision.

Returns:

the Y coordinate of this Point2D.

Since:

JDK1.2

public int hashCode()

Returns the hashcode for this Point2D.

Returns:

a hash code for this Point2D.

Overrides:

hashCode in class Object

public abstract void setLocation(double x,
                                 double y)

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

Parameters:

x, y - the coordinates of this Point2D

Since:

JDK1.2

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 the which to set this Point2D

Since:

JDK1.2

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