net.von_gagern.martin.confoo.mesh.flat
Class Vertex2D

java.lang.Object
  java.awt.geom.Point2D
      java.awt.geom.Point2D.Double
          net.von_gagern.martin.confoo.mesh.flat.Vertex2D

All Implemented Interfaces:

Serializable, Cloneable

public class Vertex2D
extends Point2D.Double

A 2D point with equality comparison.

To easily construct meshes, it is useful to identify common vertices. This implementation considers points equal if they exactly agree in their coordinates. This contrasts with the implementation in the super class, which inherits the equality comparison from Object.

Since:

1.0

Author:

Martin von Gagern

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.awt.geom.Point2D

Point2D.Double, Point2D.Float

Field Summary

Fields inherited from class java.awt.geom.Point2D.Double

x, y

Constructor Summary

Vertex2D(double x, double y)
Construct vertex from given coordinates.

Vertex2D(Point2D p)
Construct vertex from given point.

Method Summary

boolean	equals(Object o) Compare vertex to other point.
int	hashCode() Calculate hash code from coordinates.

Methods inherited from class java.awt.geom.Point2D.Double

getX, getY, setLocation, toString

Methods inherited from class java.awt.geom.Point2D

clone, distance, distance, distance, distanceSq, distanceSq, distanceSq, setLocation

Methods inherited from class java.lang.Object

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

Constructor Detail

Vertex2D

public Vertex2D(Point2D p)

Construct vertex from given point.

Parameters:

p - the point used to initialize the coordinates

Vertex2D

public Vertex2D(double x,
                double y)

Construct vertex from given coordinates.

Parameters:

x - the initial x coordinate

y - the initial y coordinate

Method Detail

hashCode

public int hashCode()

Calculate hash code from coordinates.

Overrides:

hashCode in class Point2D

Returns:

a hash code derived from the coordinates

equals

public boolean equals(Object o)

Compare vertex to other point. The comparison is based on coordinates, not object identity. The classes aren't compared either. Any Point2D with the same coordinates will compare equal. This is a violation of symmetry! While it may be handy to compare vertices with other points where you know what you are doing, mixing them in any container that compares its elements is a bad idea, as it can lead to inconsistent behaviour.

Overrides:

equals in class Point2D

Parameters:

o - another object

Returns:

whether o is a Point2D with the same coordinates as this vertex

See Also:

Point2D