Package org.jbox2d.dynamics.joints
Class DistanceJoint
java.lang.Object
org.jbox2d.dynamics.joints.Joint
org.jbox2d.dynamics.joints.DistanceJoint
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.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate float
private float
private float
private float
private float
private int
private int
private float
private float
private float
private float
private float
private final Vec2
private final Vec2
private final Vec2
private final Vec2
private float
private final Vec2
private final Vec2
private final Vec2
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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
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
float
float
void
getReactionForce
(float inv_dt, Vec2 argOut) Get the reaction force given the inverse time step.float
getReactionTorque
(float inv_dt) Get the reaction torque given the inverse time step.void
void
setDampingRatio
(float damp) void
setFrequency
(float hz) void
setLength
(float argLength) boolean
This returns true if the position errors are within tolerance.void
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
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Field Details
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m_frequencyHz
private float m_frequencyHz -
m_dampingRatio
private float m_dampingRatio -
m_bias
private float m_bias -
m_localAnchorA
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m_localAnchorB
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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
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m_rA
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m_rB
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m_localCenterA
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m_localCenterB
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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
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Constructor Details
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DistanceJoint
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Method Details
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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
Description copied from class:Joint
get the anchor point on bodyA in world coordinates.- Specified by:
getAnchorA
in classJoint
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getAnchorB
Description copied from class:Joint
get the anchor point on bodyB in world coordinates.- Specified by:
getAnchorB
in classJoint
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getLocalAnchorA
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getLocalAnchorB
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getReactionForce
Get the reaction force given the inverse time step. Unit is N.- Specified by:
getReactionForce
in classJoint
- Parameters:
inv_dt
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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 classJoint
- Parameters:
inv_dt
-- Returns:
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initVelocityConstraints
- Specified by:
initVelocityConstraints
in classJoint
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solveVelocityConstraints
- Specified by:
solveVelocityConstraints
in classJoint
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solvePositionConstraints
Description copied from class:Joint
This returns true if the position errors are within tolerance.- Specified by:
solvePositionConstraints
in classJoint
- Returns:
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