Class DistanceJoint

java.lang.Object
org.jbox2d.dynamics.joints.Joint
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 Details

    • m_frequencyHz

      private float m_frequencyHz

    • m_dampingRatio

      private float m_dampingRatio

    • m_bias

      private float m_bias

    • m_localAnchorA

      private final Vec2 m_localAnchorA

    • m_localAnchorB

      private final Vec2 m_localAnchorB

    • m_gamma

      private float m_gamma

    • m_impulse

      private float m_impulse

    • m_length

      private float m_length

    • m_indexA

      private int m_indexA

    • m_indexB

      private int m_indexB

    • m_u

      private final Vec2 m_u

    • m_rA

      private final Vec2 m_rA

    • m_rB

      private final Vec2 m_rB

    • m_localCenterA

      private final Vec2 m_localCenterA

    • m_localCenterB

      private final Vec2 m_localCenterB

    • m_invMassA

      private float m_invMassA

    • m_invMassB

      private float m_invMassB

    • m_invIA

      private float m_invIA

    • m_invIB

      private float m_invIB

    • m_mass

      private float m_mass

  • Constructor Details

  • Method Details

    • 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

    • getLocalAnchorA

      public Vec2 getLocalAnchorA()

    • getLocalAnchorB

      public Vec2 getLocalAnchorB()

    • getReactionForce

      public void getReactionForce(float inv_dt, Vec2 argOut)
      Get the reaction force given the inverse time step. Unit is N.
      Specified by:
      getReactionForce in class Joint
      Parameters:
      inv_dt -

    • getReactionTorque

      public float getReactionTorque(float inv_dt)
      Get the reaction torque given the inverse time step. Unit is N*m. This is always zero for a distance joint.
      Specified by:
      getReactionTorque in class Joint
      Parameters:
      inv_dt -
      Returns:

    • initVelocityConstraints

      public void initVelocityConstraints(SolverData data)
      Specified by:
      initVelocityConstraints in class Joint

    • solveVelocityConstraints

      public void solveVelocityConstraints(SolverData data)
      Specified by:
      solveVelocityConstraints 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: