org.jbox2d.dynamics.joints

Class MouseJoint

java.lang.Object

org.jbox2d.dynamics.joints.Joint

org.jbox2d.dynamics.joints.MouseJoint

public class MouseJoint
extends Joint

A mouse joint is used to make a point on a body track a specified world point. This a soft constraint with a maximum force. This allows the constraint to stretch and without applying huge forces. NOTE: this joint is not documented in the manual because it was developed to be used in the testbed. If you want to learn how to use the mouse joint, look at the testbed.

Author:

Daniel

Field Summary

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

m_bodyA, m_bodyB, m_edgeA, m_edgeB, m_islandFlag, m_next, m_prev, m_userData, pool

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MouseJoint(IWorldPool argWorld, MouseJointDef def)

Method Summary

Modifier and Type	Method and 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.
float	getDampingRatio()
float	getFrequency()
float	getMaxForce()
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.
Vec2	getTarget()
void	initVelocityConstraints(SolverData data)
void	setDampingRatio(float ratio)
void	setFrequency(float hz)
void	setMaxForce(float force)
void	setTarget(Vec2 target)
boolean	solvePositionConstraints(SolverData data) This returns true if the position errors are within tolerance.
void	solveVelocityConstraints(SolverData data)

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 Detail

MouseJoint

protected MouseJoint(IWorldPool argWorld,
                     MouseJointDef def)

Method Detail

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

Returns:

setTarget

public void setTarget(Vec2 target)

getTarget

public Vec2 getTarget()

setMaxForce

public void setMaxForce(float force)

getMaxForce

public float getMaxForce()

setFrequency

public void setFrequency(float hz)

getFrequency

public float getFrequency()

setDampingRatio

public void setDampingRatio(float ratio)

getDampingRatio

public float getDampingRatio()

initVelocityConstraints

public void initVelocityConstraints(SolverData data)

Specified by:

initVelocityConstraints in class Joint

solvePositionConstraints

public boolean solvePositionConstraints(SolverData data)

Description copied from class: Joint

This returns true if the position errors are within tolerance.

Specified by:

solvePositionConstraints in class Joint

Returns:

solveVelocityConstraints

public void solveVelocityConstraints(SolverData data)

Specified by:

solveVelocityConstraints in class Joint