Module java.desktop
Package 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
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.

Since:
1.2

  • Nested Class Summary

    Nested Classes 
    Modifier and Type Class Description
    static class  Point2D.Double
    The Double class defines a point specified in double precision.
    static class  Point2D.Float
    The Float class defines a point specified in float precision.

  • Constructor Summary

    Constructors 
    Modifier Constructor Description
    protected Point2D()
    This is an abstract class that cannot be instantiated directly.

  • Method Summary

    Modifier and Type Method Description
    Object clone()
    Creates a new object of the same class and with the same contents as this object.
    double distance​(double px, double py)
    Returns the distance from this Point2D to a specified point.
    static double distance​(double x1, double y1, double x2, double y2)
    Returns the distance between two points.
    double distance​(Point2D pt)
    Returns 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.
    double distanceSq​(Point2D pt)
    Returns the square of the distance from this Point2D to a specified Point2D.
    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.

    Methods declared in class java.lang.Object

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

  • Constructor Details

    • 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

  • Method Details

    • 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