b2PulleyJoint Class Reference

#include <b2PulleyJoint.h>

Inheritance diagram for b2PulleyJoint:

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 body2 at the joint anchor in Newtons.
float32	GetReactionTorque (float32 inv_dt) const
	Get the reaction torque on body2 in N*m.
b2Vec2	GetGroundAnchorA () const
	Get the first ground anchor.
b2Vec2	GetGroundAnchorB () const
	Get the second ground anchor.
float32	GetLength1 () const
	Get the current length of the segment attached to body1.
float32	GetLength2 () const
	Get the current length of the segment attached to body2.
float32	GetRatio () const
	Get the pulley ratio.
Protected Member Functions
	b2PulleyJoint (const b2PulleyJointDef *data)
void	InitVelocityConstraints (const b2TimeStep &step)
void	SolveVelocityConstraints (const b2TimeStep &step)
bool	SolvePositionConstraints (float32 baumgarte)
Protected Attributes
b2Vec2	m_groundAnchor1
b2Vec2	m_groundAnchor2
b2Vec2	m_localAnchor1
b2Vec2	m_localAnchor2
b2Vec2	m_u1
b2Vec2	m_u2
float32	m_constant
float32	m_ratio
float32	m_maxLength1
float32	m_maxLength2
float32	m_pulleyMass
float32	m_limitMass1
float32	m_limitMass2
float32	m_impulse
float32	m_limitImpulse1
float32	m_limitImpulse2
b2LimitState	m_state
b2LimitState	m_limitState1
b2LimitState	m_limitState2
Friends
class	b2Joint

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Detailed Description

The pulley joint is connected to two bodies and two fixed ground points. The pulley supports a ratio such that: length1 + ratio * length2 <= constant Yes, the force transmitted is scaled by the ratio. The pulley also enforces a maximum length limit on both sides. This is useful to prevent one side of the pulley hitting the top.

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Constructor & Destructor Documentation

b2PulleyJoint::b2PulleyJoint

(

const b2PulleyJointDef *

data

)

[protected]

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Member Function Documentation

b2Vec2 b2PulleyJoint::GetAnchorA

(

)

const [virtual]

Get the anchor point on bodyA in world coordinates.

Implements b2Joint.

b2Vec2 b2PulleyJoint::GetAnchorB

(

)

const [virtual]

Get the anchor point on bodyB in world coordinates.

Implements b2Joint.

b2Vec2 b2PulleyJoint::GetGroundAnchorA

(

)

const

Get the first ground anchor.

b2Vec2 b2PulleyJoint::GetGroundAnchorB

(

)

const

Get the second ground anchor.

float32 b2PulleyJoint::GetLength1

(

)

const

Get the current length of the segment attached to body1.

float32 b2PulleyJoint::GetLength2

(

)

const

Get the current length of the segment attached to body2.

float32 b2PulleyJoint::GetRatio

(

)

const

Get the pulley ratio.

b2Vec2 b2PulleyJoint::GetReactionForce

(

float32

inv_dt

)

const [virtual]

Get the reaction force on body2 at the joint anchor in Newtons.

Implements b2Joint.

float32 b2PulleyJoint::GetReactionTorque

(

float32

inv_dt

)

const [virtual]

Get the reaction torque on body2 in N*m.

Implements b2Joint.

void b2PulleyJoint::InitVelocityConstraints

(

const b2TimeStep &

step

)

[protected, virtual]

Implements b2Joint.

bool b2PulleyJoint::SolvePositionConstraints

(

float32

baumgarte

)

[protected, virtual]

Implements b2Joint.

void b2PulleyJoint::SolveVelocityConstraints

(

const b2TimeStep &

step

)

[protected, virtual]

Implements b2Joint.

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Friends And Related Function Documentation

friend class b2Joint [friend]

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Member Data Documentation

float32 b2PulleyJoint::m_constant [protected]

b2Vec2 b2PulleyJoint::m_groundAnchor1 [protected]

b2Vec2 b2PulleyJoint::m_groundAnchor2 [protected]

float32 b2PulleyJoint::m_impulse [protected]

float32 b2PulleyJoint::m_limitImpulse1 [protected]

float32 b2PulleyJoint::m_limitImpulse2 [protected]

float32 b2PulleyJoint::m_limitMass1 [protected]

float32 b2PulleyJoint::m_limitMass2 [protected]

b2LimitState b2PulleyJoint::m_limitState1 [protected]

b2LimitState b2PulleyJoint::m_limitState2 [protected]

b2Vec2 b2PulleyJoint::m_localAnchor1 [protected]

b2Vec2 b2PulleyJoint::m_localAnchor2 [protected]

float32 b2PulleyJoint::m_maxLength1 [protected]

float32 b2PulleyJoint::m_maxLength2 [protected]

float32 b2PulleyJoint::m_pulleyMass [protected]

float32 b2PulleyJoint::m_ratio [protected]

b2LimitState b2PulleyJoint::m_state [protected]

b2Vec2 b2PulleyJoint::m_u1 [protected]

b2Vec2 b2PulleyJoint::m_u2 [protected]

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

• Box2D/Box2D/Dynamics/Joints/b2PulleyJoint.h
• Box2D/Box2D/Dynamics/Joints/b2PulleyJoint.cpp