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b2GearJoint Class Reference

#include <b2GearJoint.h>

Inherits b2Joint.

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 bodyB at the joint anchor in Newtons.
float32 GetReactionTorque (float32 inv_dt) const
 Get the reaction torque on bodyB in N*m.
b2JointGetJoint1 ()
 Get the first joint.
b2JointGetJoint2 ()
 Get the second joint.
void SetRatio (float32 ratio)
 Set/Get the gear ratio.
float32 GetRatio () const
void Dump ()
 Dump joint to dmLog.
- Public Member Functions inherited from b2Joint
b2JointType GetType () const
 Get the type of the concrete joint.
b2BodyGetBodyA ()
 Get the first body attached to this joint.
b2BodyGetBodyB ()
 Get the second body attached to this joint.
b2JointGetNext ()
 Get the next joint the world joint list.
const b2JointGetNext () const
void * GetUserData () const
 Get the user data pointer.
void SetUserData (void *data)
 Set the user data pointer.
bool IsActive () const
 Short-cut function to determine if either body is inactive.
bool GetCollideConnected () const
virtual void ShiftOrigin (const b2Vec2 &newOrigin)
 Shift the origin for any points stored in world coordinates.

Protected Member Functions

 b2GearJoint (const b2GearJointDef *data)
void InitVelocityConstraints (const b2SolverData &data)
void SolveVelocityConstraints (const b2SolverData &data)
bool SolvePositionConstraints (const b2SolverData &data)
- Protected Member Functions inherited from b2Joint
 b2Joint (const b2JointDef *def)

Protected Attributes

b2JointType m_typeA
b2JointType m_typeB
b2Vec2 m_localAnchorA
b2Vec2 m_localAnchorB
b2Vec2 m_localAnchorC
b2Vec2 m_localAnchorD
b2Vec2 m_localAxisC
b2Vec2 m_localAxisD
float32 m_referenceAngleA
float32 m_referenceAngleB
float32 m_constant
float32 m_ratio
float32 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
float32 m_mA
float32 m_mB
float32 m_mC
float32 m_mD
float32 m_iA
float32 m_iB
float32 m_iC
float32 m_iD
b2Vec2 m_JvAC
b2Vec2 m_JvBD
float32 m_JwA
float32 m_JwB
float32 m_JwC
float32 m_JwD
float32 m_mass
- Protected Attributes inherited from b2Joint
b2JointType m_type
b2JointEdge m_edgeA
b2JointEdge m_edgeB
int32 m_index
bool m_islandFlag
bool m_collideConnected
void * m_userData


class b2Joint

Additional Inherited Members

- Static Protected Member Functions inherited from b2Joint
static b2JointCreate (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.

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

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