b2GearJoint Class Reference

#include <b2_gear_joint.h>

Inheritance diagram for b2GearJoint:

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...
b2Joint *	GetJoint1 ()
	Get the first joint.
b2Joint *	GetJoint2 ()
	Get the second joint.
void	SetRatio (float ratio)
	Set/Get the gear ratio.
float	GetRatio () const
void	Dump () override
	Dump joint to dmLog. 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
	b2GearJoint (const b2GearJointDef *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
b2Joint *	m_joint1
b2Joint *	m_joint2
b2JointType	m_typeA
b2JointType	m_typeB
b2Body *	m_bodyC
b2Body *	m_bodyD
b2Vec2	m_localAnchorA
b2Vec2	m_localAnchorB
b2Vec2	m_localAnchorC
b2Vec2	m_localAnchorD
b2Vec2	m_localAxisC
b2Vec2	m_localAxisD
float	m_referenceAngleA
float	m_referenceAngleB
float	m_constant
float	m_ratio
float	m_impulse
int32	m_indexA
int32	m_indexB
int32	m_indexC
int32	m_indexD
b2Vec2	m_lcA
b2Vec2	m_lcB
b2Vec2	m_lcC
b2Vec2	m_lcD
float	m_mA
float	m_mB
float	m_mC
float	m_mD
float	m_iA
float	m_iB
float	m_iC
float	m_iD
b2Vec2	m_JvAC
b2Vec2	m_JvBD
float	m_JwA
float	m_JwB
float	m_JwC
float	m_JwD
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 gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear ratio to bind the motions together: coordinate1 + ratio * coordinate2 = constant The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length.

Warning

You have to manually destroy the gear joint if joint1 or joint2 is destroyed.

Member Function Documentation

Dump()

void b2GearJoint::Dump ( )

overridevirtual

Dump joint to dmLog.

Reimplemented from b2Joint.

GetAnchorA()

b2Vec2 b2GearJoint::GetAnchorA ( ) const

overridevirtual

Get the anchor point on bodyA in world coordinates.

Implements b2Joint.

GetAnchorB()

b2Vec2 b2GearJoint::GetAnchorB ( ) const

overridevirtual

Get the anchor point on bodyB in world coordinates.

Implements b2Joint.

GetReactionForce()

b2Vec2 b2GearJoint::GetReactionForce ( float  inv_dt ) const

overridevirtual

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

Implements b2Joint.

GetReactionTorque()

float b2GearJoint::GetReactionTorque ( float  inv_dt ) const

overridevirtual

Get the reaction torque on bodyB in N*m.

Implements b2Joint.

InitVelocityConstraints()

void b2GearJoint::InitVelocityConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

SolvePositionConstraints()

bool b2GearJoint::SolvePositionConstraints ( const b2SolverData &  data )

overrideprotectedvirtual

Implements b2Joint.

SolveVelocityConstraints()

void b2GearJoint::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_gear_joint.h