Module org.dyn4j

Package org.dyn4j.geometry

Class Link

Object

AbstractShape

Segment

Link

All Implemented Interfaces:

DataContainer, Convex, Rotatable, Shape, Transformable, Translatable, Wound

public class Link
extends Segment
implements Convex, Wound, Shape, Transformable, DataContainer

This class is a specialization of the Segment class that provides smooth sliding across a chain of line segments. This is achieved by storing the connectivity information between the links. With this, a correction process is performed to avoid the 'internal edge' problem.

A Link is an infinitely thin line segment and will behave like the Segment class in collision response.

Like the Segment class, this class can be locally rotated or translated. However, doing so will also translate/rotated the next or previous Links.

For ease of use, it's recommended to use the Geometry class to create chains of Links.

Since:

3.2.2

Version:

3.2.2

Author:

William Bittle

Constructor Summary

Constructors

Constructor	Description
Link(Vector2 point1, Vector2 point2)	Creates a new link.

Method Summary

Modifier and Type	Method	Description
Link	getNext()	Returns the next link in the chain.
Vector2	getPoint0()	Returns the last vertex of the previous segment.
Vector2	getPoint3()	Returns the first vertex of the next segment.
Link	getPrevious()	Returns the previous link in the chain.
void	rotate(double theta, double x, double y)	Rotates the object about the given coordinates.
void	setNext(Link next)	Sets the next link in the chain.
void	setPrevious(Link previous)	Sets the previous link in the chain.
String	toString()
void	translate(double x, double y)	Translates the object the given amounts in the respective directions.

Methods inherited from class Segment

computeAABB, contains, contains, createAABB, createMass, getAxes, getFarthestFeature, getFarthestFeature, getFarthestPoint, getFarthestPoint, getFoci, getLength, getLineIntersection, getLineIntersection, getLocation, getNormalIterator, getNormals, getPoint1, getPoint2, getPointOnLineClosestToPoint, getPointOnLineClosestToPoint, getPointOnSegmentClosestToPoint, getPointOnSegmentClosestToPoint, getRadius, getSegmentIntersection, getSegmentIntersection, getVertexIterator, getVertices, project, rotate

Methods inherited from class AbstractShape

computeAABB, contains, createAABB, getCenter, getRadius, getUserData, project, rotate, rotate, rotate, rotate, rotateAboutCenter, setUserData, translate

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface Convex

getAxes, getFarthestFeature, getFarthestPoint, getFoci

Methods inherited from interface DataContainer

getUserData, setUserData

Methods inherited from interface Rotatable

rotate, rotate, rotate, rotate, rotate

Methods inherited from interface Shape

computeAABB, computeAABB, contains, contains, createAABB, createAABB, createMass, getCenter, getRadius, getRadius, project, project, rotateAboutCenter

Methods inherited from interface Translatable

translate

Methods inherited from interface Wound

getNormalIterator, getNormals, getVertexIterator, getVertices

Constructor Detail

Link

public Link(Vector2 point1,
            Vector2 point2)

Creates a new link.

Parameters:

point1 - the first vertex

point2 - the last vertex

Method Detail

getPoint0

public Vector2 getPoint0()

Returns the last vertex of the previous segment.

Returns:

Vector2

getPoint3

public Vector2 getPoint3()

Returns the first vertex of the next segment.

Returns:

Vector2

getNext

public Link getNext()

Returns the next link in the chain.

Returns:

Link

getPrevious

public Link getPrevious()

Returns the previous link in the chain.

Returns:

Link

setNext

public void setNext(Link next)

Sets the next link in the chain.

This method will also:

1. Unlink the current next (if applicable) and this link
2. Link the given next and this link

Parameters:

next - the next link

setPrevious

public void setPrevious(Link previous)

Sets the previous link in the chain.

This method will also:

1. Unlink the current previous (if applicable) and this link
2. Link the given previous and this link

Parameters:

previous - the previous link

toString

public String toString()

Overrides:

toString in class Segment

rotate

public final void rotate(double theta,
                         double x,
                         double y)

Description copied from interface: Rotatable

Rotates the object about the given coordinates.

Specified by:

rotate in interface Rotatable

Overrides:

rotate in class AbstractShape

Parameters:

theta - the angle of rotation in radians

x - the x coordinate to rotate about

y - the y coordinate to rotate about

translate

public final void translate(double x,
                            double y)

Description copied from interface: Translatable

Translates the object the given amounts in the respective directions.

Specified by:

translate in interface Translatable

Overrides:

translate in class Segment

Parameters:

x - the translation in the x direction

y - the translation in the y direction