C# Class FarseerPhysics.Dynamics.Joints.DistanceJoint

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

Inheritance: Joint

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Public Properties

Property	Type	Description
dampingRatio	float
frequency	float
length	float
localAnchorA	Vector2
localAnchorB	Vector2

Public Methods

Method	Description
DistanceJoint ( Body bodyA, Body bodyB, Vector2 anchorA, Vector2 anchorB, bool useWorldCoordinates = false ) : System	This requires defining an anchor point on both bodies and the non-zero length of the distance joint. If you don't supply a length, the local anchor points is used so that the initial configuration can violate the constraint slightly. This helps when saving and loading a game. Warning Do not use a zero or short length.
getReactionForce ( float invDt ) : Vector2	Get the reaction force given the inverse time step. Unit is N.
getReactionTorque ( float invDt ) : float	Get the reaction torque given the inverse time step. Unit is N*m. This is always zero for a distance joint.

Private Methods

Method	Description
DistanceJoint ( ) : System
initVelocityConstraints ( SolverData &data ) : void
solvePositionConstraints ( SolverData &data ) : bool
solveVelocityConstraints ( SolverData &data ) : void

Method Details

DistanceJoint() public method

This requires defining an anchor point on both bodies and the non-zero length of the distance joint. If you don't supply a length, the local anchor points is used so that the initial configuration can violate the constraint slightly. This helps when saving and loading a game. Warning Do not use a zero or short length.

public DistanceJoint ( Body bodyA, Body bodyB, Vector2 anchorA, Vector2 anchorB, bool useWorldCoordinates = false ) : System
bodyA	Body	The first body
bodyB	Body	The second body
anchorA	Vector2	The first body anchor
anchorB	Vector2	The second body anchor
useWorldCoordinates	bool	Set to true if you are using world coordinates as anchors.
return	System

getReactionForce() public method

Get the reaction force given the inverse time step. Unit is N.

public getReactionForce ( float invDt ) : Vector2
invDt	float
return	Vector2

getReactionTorque() public method

Get the reaction torque given the inverse time step. Unit is N*m. This is always zero for a distance joint.

public getReactionTorque ( float invDt ) : float
invDt	float
return	float

Property Details

dampingRatio public_oe property

The damping ratio. 0 = no damping, 1 = critical damping.

public float dampingRatio
return	float

frequency public_oe property

The mass-spring-damper frequency in Hertz. A value of 0 disables softness.

public float frequency
return	float

length public_oe property

The natural length between the anchor points. Manipulating the length can lead to non-physical behavior when the frequency is zero.

public float length
return	float

localAnchorA public_oe property

The local anchor point relative to bodyA's origin.

public Vector2 localAnchorA
return	Vector2

localAnchorB public_oe property

The local anchor point relative to bodyB's origin.

public Vector2 localAnchorB
return	Vector2