b2DistanceJoint Class Reference

#include <b2_distance_joint.h>

Inheritance diagram for b2DistanceJoint:

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
float	GetReactionTorque (float inv_dt) const override
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.
float	GetLength () const
	Get the rest length.
float	SetLength (float length)
float	GetMinLength () const
	Get the minimum length.
float	SetMinLength (float minLength)
float	GetMaxLength () const
	Get the maximum length.
float	SetMaxLength (float maxLength)
float	GetCurrentLength () const
	Get the current length.
void	SetStiffness (float stiffness)
	Set/get the linear stiffness in N/m.
float	GetStiffness () const
void	SetDamping (float damping)
	Set/get linear damping in N*s/m.
float	GetDamping () const
void	Dump () override
	Dump joint to dmLog. More...
void	Draw (b2Draw *draw) const override
	Debug draw this joint. 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
	b2DistanceJoint (const b2DistanceJointDef *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
float	m_stiffness
float	m_damping
float	m_bias
float	m_length
float	m_minLength
float	m_maxLength
b2Vec2	m_localAnchorA
b2Vec2	m_localAnchorB
float	m_gamma
float	m_impulse
float	m_lowerImpulse
float	m_upperImpulse
int32	m_indexA
int32	m_indexB
b2Vec2	m_u
b2Vec2	m_rA
b2Vec2	m_rB
b2Vec2	m_localCenterA
b2Vec2	m_localCenterB
float	m_currentLength
float	m_invMassA
float	m_invMassB
float	m_invIA
float	m_invIB
float	m_softMass
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

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

Member Function Documentation

Draw()

void b2DistanceJoint::Draw ( b2Draw *  draw ) const

overridevirtual

Debug draw this joint.

Reimplemented from b2Joint.

Dump()

void b2DistanceJoint::Dump ( )

overridevirtual

Dump joint to dmLog.

Reimplemented from b2Joint.

GetAnchorA()

b2Vec2 b2DistanceJoint::GetAnchorA ( ) const

overridevirtual

Get the anchor point on bodyA in world coordinates.

Implements b2Joint.

GetAnchorB()

b2Vec2 b2DistanceJoint::GetAnchorB ( ) const

overridevirtual

Get the anchor point on bodyB in world coordinates.

Implements b2Joint.

GetReactionForce()

b2Vec2 b2DistanceJoint::GetReactionForce ( float  inv_dt ) const

overridevirtual

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

Implements b2Joint.

GetReactionTorque()

float b2DistanceJoint::GetReactionTorque ( float  inv_dt ) const

overridevirtual

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

Implements b2Joint.

InitVelocityConstraints()

void b2DistanceJoint::InitVelocityConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

SetLength()

float b2DistanceJoint::SetLength

(

float

length

)

Set the rest length

Returns

clamped rest length

SetMaxLength()

float b2DistanceJoint::SetMaxLength

(

float

maxLength

)

Set the maximum length

Returns

the clamped maximum length

SetMinLength()

float b2DistanceJoint::SetMinLength

(

float

minLength

)

Set the minimum length

Returns

the clamped minimum length

SolvePositionConstraints()

bool b2DistanceJoint::SolvePositionConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

SolveVelocityConstraints()

void b2DistanceJoint::SolveVelocityConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

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

• include/box2d/b2_distance_joint.h