| Box2D 2.2.1 A 2D Physics Engine for Games

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b2RopeJoint Class Reference

`#include <b2RopeJoint.h>`

Inheritance diagram for b2RopeJoint:

List of all members.

## Public Member Functions

b2Vec2 | GetAnchorA () const
| Get the anchor point on bodyA in world coordinates.
b2Vec2 | GetAnchorB () const
| Get the anchor point on bodyB in world coordinates.
b2Vec2 | GetReactionForce (float32 inv_dt) const
| Get the reaction force on bodyB at the joint anchor in Newtons.
float32 | GetReactionTorque (float32 inv_dt) const
| Get the reaction torque on bodyB in N*m.
const b2Vec2 & | GetLocalAnchorA () const
| The local anchor point relative to bodyA's origin.
const b2Vec2 & | GetLocalAnchorB () const
| The local anchor point relative to bodyB's origin.
void | SetMaxLength (float32 length)
| Set/Get the maximum length of the rope.
float32 | GetMaxLength () const
b2LimitState | GetLimitState () const
void | Dump ()
| Dump joint to dmLog.

## Protected Member Functions

| b2RopeJoint (const b2RopeJointDef *data)
void | InitVelocityConstraints (const b2SolverData &data)
void | SolveVelocityConstraints (const b2SolverData &data)
bool | SolvePositionConstraints (const b2SolverData &data)

## Protected Attributes

b2Vec2 | m_localAnchorA
b2Vec2 | m_localAnchorB
float32 | m_maxLength
float32 | m_length
float32 | m_impulse
int32 | m_indexA
int32 | m_indexB
b2Vec2 | m_u
b2Vec2 | m_rA
b2Vec2 | m_rB
b2Vec2 | m_localCenterA
b2Vec2 | m_localCenterB
float32 | m_invMassA
float32 | m_invMassB
float32 | m_invIA
float32 | m_invIB
float32 | m_mass
b2LimitState | m_state

## Friends

class | b2Joint

## Detailed Description

A rope joint enforces a maximum distance between two points on two bodies. It has no other effect. Warning: if you attempt to change the maximum length during the simulation you will get some non-physical behavior. A model that would allow you to dynamically modify the length would have some sponginess, so I chose not to implement it that way. See b2DistanceJoint if you want to dynamically control length.

The documentation for this class was generated from the following files:

- b2RopeJoint.h
- b2RopeJoint.cpp

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