org.jbox2d.dynamics.joints
Class DistanceJoint

java.lang.Object
  extended by org.jbox2d.dynamics.joints.Joint
      extended by org.jbox2d.dynamics.joints.DistanceJoint

public class DistanceJoint
extends Joint

A distance joint constrains two points on two bodies to remain at a fixed distance from each other. You can view this as a massless, rigid rod.


Field Summary
 float m_bias
           
 float m_dampingRatio
           
 float m_frequencyHz
           
 float m_gamma
           
 float m_impulse
           
 float m_length
           
 Vec2 m_localAnchor1
           
 Vec2 m_localAnchor2
           
 float m_mass
           
 Vec2 m_u
           
 
Fields inherited from class org.jbox2d.dynamics.joints.Joint
m_bodyA, m_bodyB, m_collideConnected, m_edgeA, m_edgeB, m_islandFlag, m_next, m_prev, m_type, m_userData, pool
 
Constructor Summary
DistanceJoint(IWorldPool argWorld, DistanceJointDef def)
           
 
Method Summary
 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 getLength()
           
 void getReactionForce(float inv_dt, Vec2 argOut)
          get the reaction force on body2 at the joint anchor in Newtons.
 float getReactionTorque(float inv_dt)
          get the reaction torque on body2 in N*m.
 void initVelocityConstraints(TimeStep step)
           
 void setDampingRatio(float damp)
           
 void setFrequency(float hz)
           
 void setLength(float argLength)
           
 boolean solvePositionConstraints(float baumgarte)
          This returns true if the position errors are within tolerance.
 void solveVelocityConstraints(TimeStep step)
           
 
Methods inherited from class org.jbox2d.dynamics.joints.Joint
create, destroy, destructor, getBodyA, getBodyB, getNext, getType, getUserData, IsActive, setUserData
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

m_localAnchor1

public final Vec2 m_localAnchor1

m_localAnchor2

public final Vec2 m_localAnchor2

m_u

public final Vec2 m_u

m_impulse

public float m_impulse

m_mass

public float m_mass

m_length

public float m_length

m_frequencyHz

public float m_frequencyHz

m_dampingRatio

public float m_dampingRatio

m_gamma

public float m_gamma

m_bias

public float m_bias
Constructor Detail

DistanceJoint

public DistanceJoint(IWorldPool argWorld,
                     DistanceJointDef def)
Method Detail

setFrequency

public void setFrequency(float hz)

getFrequency

public float getFrequency()

getLength

public float getLength()

setLength

public void setLength(float argLength)

setDampingRatio

public void setDampingRatio(float damp)

getDampingRatio

public float getDampingRatio()

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 inv_dt,
                             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 inv_dt)
Description copied from class: Joint
get the reaction torque on body2 in N*m.

Specified by:
getReactionTorque in class Joint
Returns:

initVelocityConstraints

public void initVelocityConstraints(TimeStep step)
Specified by:
initVelocityConstraints in class Joint

solveVelocityConstraints

public void solveVelocityConstraints(TimeStep step)
Specified by:
solveVelocityConstraints in class Joint

solvePositionConstraints

public boolean solvePositionConstraints(float baumgarte)
Description copied from class: Joint
This returns true if the position errors are within tolerance.

Specified by:
solvePositionConstraints in class Joint
Returns:


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