b2RopeJoint Class Reference

#include <b2RopeJoint.h>

Inheritance diagram for b2RopeJoint:

List of all members.

Public Member Functions
void	Dump ()
	Dump joint to dmLog.
b2Vec2	GetAnchorA () const
	Get the anchor point on bodyA in world coordinates.
b2Vec2	GetAnchorB () const
	Get the anchor point on bodyB in world coordinates.
b2LimitState	GetLimitState () const
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.
float32	GetMaxLength () const
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.
void	SetMaxLength (float32 length)
	Set/Get the maximum length of the rope.
Protected Member Functions
	b2RopeJoint (const b2RopeJointDef *data)
void	InitVelocityConstraints (const b2SolverData &data)
bool	SolvePositionConstraints (const b2SolverData &data)
void	SolveVelocityConstraints (const b2SolverData &data)
Protected Attributes
float32	m_impulse
int32	m_indexA
int32	m_indexB
float32	m_invIA
float32	m_invIB
float32	m_invMassA
float32	m_invMassB
float32	m_length
b2Vec2	m_localAnchorA
b2Vec2	m_localAnchorB
b2Vec2	m_localCenterA
b2Vec2	m_localCenterB
float32	m_mass
float32	m_maxLength
b2Vec2	m_rA
b2Vec2	m_rB
b2LimitState	m_state
b2Vec2	m_u
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.

Definition at line 58 of file b2RopeJoint.h.

---

Constructor & Destructor Documentation

b2RopeJoint::b2RopeJoint

(

const b2RopeJointDef *

data

)

[protected]

Definition at line 32 of file b2RopeJoint.cpp.

---

Member Function Documentation

void b2RopeJoint::Dump

(

)

[virtual]

Dump joint to dmLog.

Reimplemented from b2Joint.

Definition at line 228 of file b2RopeJoint.cpp.

b2Vec2 b2RopeJoint::GetAnchorA

(

)

const [virtual]

Get the anchor point on bodyA in world coordinates.

Implements b2Joint.

Definition at line 196 of file b2RopeJoint.cpp.

b2Vec2 b2RopeJoint::GetAnchorB

(

)

const [virtual]

Get the anchor point on bodyB in world coordinates.

Implements b2Joint.

Definition at line 201 of file b2RopeJoint.cpp.

b2LimitState b2RopeJoint::GetLimitState

(

)

const

Definition at line 223 of file b2RopeJoint.cpp.

const b2Vec2& b2RopeJoint::GetLocalAnchorA

(

)

const [inline]

The local anchor point relative to bodyA's origin.

Definition at line 68 of file b2RopeJoint.h.

const b2Vec2& b2RopeJoint::GetLocalAnchorB

(

)

const [inline]

The local anchor point relative to bodyB's origin.

Definition at line 71 of file b2RopeJoint.h.

float32 b2RopeJoint::GetMaxLength

(

)

const

Definition at line 218 of file b2RopeJoint.cpp.

b2Vec2 b2RopeJoint::GetReactionForce

(

float32

inv_dt

)

const [virtual]

Get the reaction force on bodyB at the joint anchor in Newtons.

Implements b2Joint.

Definition at line 206 of file b2RopeJoint.cpp.

float32 b2RopeJoint::GetReactionTorque

(

float32

inv_dt

)

const [virtual]

Get the reaction torque on bodyB in N*m.

Implements b2Joint.

Definition at line 212 of file b2RopeJoint.cpp.

void b2RopeJoint::InitVelocityConstraints

(

const b2SolverData &

data

)

[protected, virtual]

Implements b2Joint.

Definition at line 46 of file b2RopeJoint.cpp.

void b2RopeJoint::SetMaxLength

(

float32

length

)

[inline]

Set/Get the maximum length of the rope.

Definition at line 74 of file b2RopeJoint.h.

bool b2RopeJoint::SolvePositionConstraints

(

const b2SolverData &

data

)

[protected, virtual]

Implements b2Joint.

Definition at line 162 of file b2RopeJoint.cpp.

void b2RopeJoint::SolveVelocityConstraints

(

const b2SolverData &

data

)

[protected, virtual]

Implements b2Joint.

Definition at line 126 of file b2RopeJoint.cpp.

---

Friends And Related Function Documentation

friend class b2Joint [friend]

Definition at line 84 of file b2RopeJoint.h.

---

Member Data Documentation

float32 b2RopeJoint::m_impulse [protected]

Definition at line 96 of file b2RopeJoint.h.

int32 b2RopeJoint::m_indexA [protected]

Definition at line 99 of file b2RopeJoint.h.

int32 b2RopeJoint::m_indexB [protected]

Definition at line 100 of file b2RopeJoint.h.

float32 b2RopeJoint::m_invIA [protected]

Definition at line 108 of file b2RopeJoint.h.

float32 b2RopeJoint::m_invIB [protected]

Definition at line 109 of file b2RopeJoint.h.

float32 b2RopeJoint::m_invMassA [protected]

Definition at line 106 of file b2RopeJoint.h.

float32 b2RopeJoint::m_invMassB [protected]

Definition at line 107 of file b2RopeJoint.h.

float32 b2RopeJoint::m_length [protected]

Definition at line 95 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_localAnchorA [protected]

Definition at line 92 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_localAnchorB [protected]

Definition at line 93 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_localCenterA [protected]

Definition at line 104 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_localCenterB [protected]

Definition at line 105 of file b2RopeJoint.h.

float32 b2RopeJoint::m_mass [protected]

Definition at line 110 of file b2RopeJoint.h.

float32 b2RopeJoint::m_maxLength [protected]

Definition at line 94 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_rA [protected]

Definition at line 102 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_rB [protected]

Definition at line 103 of file b2RopeJoint.h.

b2LimitState b2RopeJoint::m_state [protected]

Definition at line 111 of file b2RopeJoint.h.

b2Vec2 b2RopeJoint::m_u [protected]

Definition at line 101 of file b2RopeJoint.h.

---

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

• b2RopeJoint.h
• b2RopeJoint.cpp