Package org.jbox2d.dynamics.joints

Class GearJoint

java.lang.Object

org.jbox2d.dynamics.joints.Joint

org.jbox2d.dynamics.joints.GearJoint

public class GearJoint
extends Joint

A gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear ratio to bind the motions together: coordinate1 + ratio * coordinate2 = constant The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length.

Author:

Daniel Murphy

Repolink:

Github: erincatto/box2d src/dynamics/b2_gear_joint.cpp

Warning:

The revolute and prismatic joints must be attached to fixed bodies (which must be body1 on those joints)., You have to manually destroy the gear joint if joint1 or joint2 is destroyed.

Field Summary

Fields inherited from class org.jbox2d.dynamics.joints.Joint

bodyA, bodyB, edgeA, edgeB, islandFlag, next, pool, prev, userData

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GearJoint(WorldPool argWorldPool, GearJointDef def)

Method Summary

Modifier and Type	Method	Description
void	getAnchorA(Vec2 argOut)	Get the anchor point on bodyA in world coordinates.
void	getAnchorB(Vec2 argOut)	Get the anchor point on bodyB in world coordinates.
Joint	getJoint1()
Joint	getJoint2()
float	getRatio()
void	getReactionForce(float invDt, Vec2 argOut)	Get the reaction force on body2 at the joint anchor in Newtons.
float	getReactionTorque(float invDt)	Get the reaction torque on body2 in N*m.
void	initVelocityConstraints(SolverData data)	Internal
void	setRatio(float argRatio)
boolean	solvePositionConstraints(SolverData data)	This returns true if the position errors are within tolerance.
void	solveVelocityConstraints(SolverData data)	Internal

Methods inherited from class org.jbox2d.dynamics.joints.Joint

create, destroy, destructor, getBodyA, getBodyB, getCollideConnected, getNext, getType, getUserData, isActive, setUserData

Methods inherited from class java.lang.Object

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

Constructor Details

GearJoint

protected GearJoint(WorldPool argWorldPool,
 GearJointDef def)

Method Details

getAnchorA

public void getAnchorA(Vec2 argOut)

Description copied from class: Joint

Get the anchor point on bodyA in world coordinates.

Specified by:

getAnchorA in class Joint

getAnchorB

public void getAnchorB(Vec2 argOut)

Description copied from class: Joint

Get the anchor point on bodyB in world coordinates.

Specified by:

getAnchorB in class Joint

getReactionForce

public void getReactionForce(float invDt,
 Vec2 argOut)

Description copied from class: Joint

Get the reaction force on body2 at the joint anchor in Newtons.

Specified by:

getReactionForce in class Joint

getReactionTorque

public float getReactionTorque(float invDt)

Description copied from class: Joint

Get the reaction torque on body2 in N*m.

Specified by:

getReactionTorque in class Joint

setRatio

public void setRatio(float argRatio)

getRatio

public float getRatio()

initVelocityConstraints

public void initVelocityConstraints(SolverData data)

Description copied from class: Joint

Internal

Specified by:

initVelocityConstraints in class Joint

solveVelocityConstraints

public void solveVelocityConstraints(SolverData data)

Description copied from class: Joint

Internal

Specified by:

solveVelocityConstraints in class Joint

getJoint1

public Joint getJoint1()

getJoint2

public Joint getJoint2()

solvePositionConstraints

public boolean solvePositionConstraints(SolverData data)

Description copied from class: Joint

This returns true if the position errors are within tolerance. Internal.

Specified by:

solvePositionConstraints in class Joint