Package org.evoludo.geom

Class Node2D

Object

Point2D

Node2D

All Implemented Interfaces:

Node, Point

public class Node2D
extends Point2D
implements Node

Class representing a (network) node in 2D space with position and radius.

Author:

Christoph Hauert

Field Summary

Fields

Modifier and Type	Field	Description
double	r	The radius r of the 2D node.

Fields inherited from class Point2D

x, y

Constructor Summary

Constructors

Constructor	Description
Node2D()	Create a new 2D node at (0,0) with radius r=0.
Node2D(double x, double y, double r)	Create a new 2D node at (x,y) with radius r.
Node2D(Node2D n)	Create a copy of the 2D node n.

Method Summary

Modifier and Type	Method	Description
double	distance(Node2D m)	Calculate the distance between this 2D node n and node m.
double	distance2(Node2D m)	Calculate the distance squared between this 2D node n and node m.
double	getR()	Get the radius r of this 2D node.
Node2D	scaleR(double scale)	Scales the radius of this node by scale.
Node2D	set(double x, double y, double r)	Set the x- and y-coordinates and the radius r of 2D node.
Node2D	set(Node2D n)	Set the coordinates and radious to those of node n.
Node2D	setR(double r)	Set the radius r of this 2D node.
String	toString()

Methods inherited from class Point2D

distance, distance, distance2, distance2, getX, getY, scale, scale, set, set, setLocation, setLocation, setX, setY, shake, shift, shift

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface Point

shake

Field Details

r

public double r

The radius r of the 2D node.

Constructor Details

Node2D

public Node2D()

Create a new 2D node at (0,0) with radius r=0.

Node2D

public Node2D(Node2D n)

Create a copy of the 2D node n.

Parameters:

n - the node to copy

Node2D

public Node2D(double x,
 double y,
 double r)

Create a new 2D node at (x,y) with radius r.

Parameters:

x - the x-coordinate

y - the y-coordinate

r - the radius

Method Details

set

public Node2D set(double x,
 double y,
 double r)

Set the x- and y-coordinates and the radius r of 2D node.

Parameters:

x - the x-coordinate

y - the y-coordinate

r - the radius

Returns:

this node

set

public Node2D set(Node2D n)

Set the coordinates and radious to those of node n.

Parameters:

n - the node to copy

Returns:

this node

getR

public double getR()

Get the radius r of this 2D node.

Returns:

the radius

setR

public Node2D setR(double r)

Set the radius r of this 2D node.

Parameters:

r - the new radius

Returns:

this node

scaleR

public Node2D scaleR(double scale)

Description copied from interface: Node

Scales the radius of this node by scale.

Specified by:

scaleR in interface Node

Parameters:

scale - the scaling factor

Returns:

this node

distance2

public double distance2(Node2D m)

Calculate the distance squared between this 2D node n and node m. The distance is between the nodes, i.e. takes their respective radii into account |n-m|<sup>2</sup>.

Parameters:

m - the node to calculate distance to

Returns:

the distance to node m

distance

public double distance(Node2D m)

Calculate the distance between this 2D node n and node m. The distance is between the nodes, i.e. takes their respective radii into account |n-m|<sup>2</sup>.

For computational efficiency the fairly expensive square-roots calculations should be avoided whenever possible.

Parameters:

m - the node to calculate distance to

Returns:

the distance to node m

See Also:

• distance2(Node2D)

toString

public String toString()

Overrides:

toString in class Point2D