b2PulleyJoint Class Reference

#include <b2_pulley_joint.h>

Inheritance diagram for b2PulleyJoint:

Public Member Functions
b2Vec2	GetAnchorA () const override
	Get the anchor point on bodyA in world coordinates. More...
b2Vec2	GetAnchorB () const override
	Get the anchor point on bodyB in world coordinates. More...
b2Vec2	GetReactionForce (float inv_dt) const override
	Get the reaction force on bodyB at the joint anchor in Newtons. More...
float	GetReactionTorque (float inv_dt) const override
	Get the reaction torque on bodyB in N*m. More...
b2Vec2	GetGroundAnchorA () const
	Get the first ground anchor.
b2Vec2	GetGroundAnchorB () const
	Get the second ground anchor.
float	GetLengthA () const
	Get the current length of the segment attached to bodyA.
float	GetLengthB () const
	Get the current length of the segment attached to bodyB.
float	GetRatio () const
	Get the pulley ratio.
float	GetCurrentLengthA () const
	Get the current length of the segment attached to bodyA.
float	GetCurrentLengthB () const
	Get the current length of the segment attached to bodyB.
void	Dump () override
	Dump joint to dmLog. More...
void	ShiftOrigin (const b2Vec2 &newOrigin) override
	Implement b2Joint::ShiftOrigin. More...
Public Member Functions inherited from b2Joint
b2JointType	GetType () const
	Get the type of the concrete joint.
b2Body *	GetBodyA ()
	Get the first body attached to this joint.
b2Body *	GetBodyB ()
	Get the second body attached to this joint.
virtual b2Vec2	GetAnchorA () const =0
	Get the anchor point on bodyA in world coordinates. More...
virtual b2Vec2	GetAnchorB () const =0
	Get the anchor point on bodyB in world coordinates. More...
virtual b2Vec2	GetReactionForce (float inv_dt) const =0
	Get the reaction force on bodyB at the joint anchor in Newtons. More...
virtual float	GetReactionTorque (float inv_dt) const =0
	Get the reaction torque on bodyB in N*m. More...
b2Joint *	GetNext ()
	Get the next joint the world joint list.
const b2Joint *	GetNext () const
b2JointUserData &	GetUserData ()
	Get the user data pointer.
bool	IsEnabled () const
	Short-cut function to determine if either body is enabled.
bool	GetCollideConnected () const
virtual void	Dump ()
	Dump this joint to the log file. More...
virtual void	ShiftOrigin (const b2Vec2 &newOrigin)
	Shift the origin for any points stored in world coordinates. More...
virtual void	Draw (b2Draw *draw) const
	Debug draw this joint. More...

Protected Member Functions
	b2PulleyJoint (const b2PulleyJointDef *data)
void	InitVelocityConstraints (const b2SolverData &data) override
void	SolveVelocityConstraints (const b2SolverData &data) override
bool	SolvePositionConstraints (const b2SolverData &data) override
Protected Member Functions inherited from b2Joint
	b2Joint (const b2JointDef *def)
virtual void	InitVelocityConstraints (const b2SolverData &data)=0
virtual void	SolveVelocityConstraints (const b2SolverData &data)=0
virtual bool	SolvePositionConstraints (const b2SolverData &data)=0

Protected Attributes
b2Vec2	m_groundAnchorA
b2Vec2	m_groundAnchorB
float	m_lengthA
float	m_lengthB
b2Vec2	m_localAnchorA
b2Vec2	m_localAnchorB
float	m_constant
float	m_ratio
float	m_impulse
int32	m_indexA
int32	m_indexB
b2Vec2	m_uA
b2Vec2	m_uB
b2Vec2	m_rA
b2Vec2	m_rB
b2Vec2	m_localCenterA
b2Vec2	m_localCenterB
float	m_invMassA
float	m_invMassB
float	m_invIA
float	m_invIB
float	m_mass
Protected Attributes inherited from b2Joint
b2JointType	m_type
b2Joint *	m_prev
b2Joint *	m_next
b2JointEdge	m_edgeA
b2JointEdge	m_edgeB
b2Body *	m_bodyA
b2Body *	m_bodyB
int32	m_index
bool	m_islandFlag
bool	m_collideConnected
b2JointUserData	m_userData

Friends
class	b2Joint

Additional Inherited Members
Static Protected Member Functions inherited from b2Joint
static b2Joint *	Create (const b2JointDef *def, b2BlockAllocator *allocator)
static void	Destroy (b2Joint *joint, b2BlockAllocator *allocator)

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. Warning: the pulley joint can get a bit squirrelly by itself. They often work better when combined with prismatic joints. You should also cover the the anchor points with static shapes to prevent one side from going to zero length.

Member Function Documentation

Dump()

void b2PulleyJoint::Dump ( )

overridevirtual

Dump joint to dmLog.

Reimplemented from b2Joint.

GetAnchorA()

b2Vec2 b2PulleyJoint::GetAnchorA ( ) const

overridevirtual

Get the anchor point on bodyA in world coordinates.

Implements b2Joint.

GetAnchorB()

b2Vec2 b2PulleyJoint::GetAnchorB ( ) const

overridevirtual

Get the anchor point on bodyB in world coordinates.

Implements b2Joint.

GetReactionForce()

b2Vec2 b2PulleyJoint::GetReactionForce ( float  inv_dt ) const

overridevirtual

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

Implements b2Joint.

GetReactionTorque()

float b2PulleyJoint::GetReactionTorque ( float  inv_dt ) const

overridevirtual

Get the reaction torque on bodyB in N*m.

Implements b2Joint.

InitVelocityConstraints()

void b2PulleyJoint::InitVelocityConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

ShiftOrigin()

void b2PulleyJoint::ShiftOrigin ( const b2Vec2 &  newOrigin )

overridevirtual

Implement b2Joint::ShiftOrigin.

Reimplemented from b2Joint.

SolvePositionConstraints()

bool b2PulleyJoint::SolvePositionConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

SolveVelocityConstraints()

void b2PulleyJoint::SolveVelocityConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

---

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

• include/box2d/b2_pulley_joint.h