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b2PulleyJoint Class Reference

#include <b2PulleyJoint.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.
b2Vec2 GetGroundAnchorA () const
 Get the first ground anchor.
b2Vec2 GetGroundAnchorB () const
 Get the second ground anchor.
float32 GetLengthA () const
 Get the current length of the segment attached to bodyA.
float32 GetLengthB () const
 Get the current length of the segment attached to bodyB.
float32 GetRatio () const
 Get the pulley ratio.
float32 GetCurrentLengthA () const
 Get the current length of the segment attached to bodyA.
float32 GetCurrentLengthB () const
 Get the current length of the segment attached to bodyB.
void Dump ()
 Dump joint to dmLog.
void ShiftOrigin (const b2Vec2 &newOrigin)
 Implement b2Joint::ShiftOrigin.
- 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

Protected Member Functions

 b2PulleyJoint (const b2PulleyJointDef *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

b2Vec2 m_groundAnchorA
b2Vec2 m_groundAnchorB
float32 m_lengthA
float32 m_lengthB
b2Vec2 m_localAnchorA
b2Vec2 m_localAnchorB
float32 m_constant
float32 m_ratio
float32 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
float32 m_invMassA
float32 m_invMassB
float32 m_invIA
float32 m_invIB
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

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.

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