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b2PrismaticJoint Class Reference

#include <b2PrismaticJoint.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.
 
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.
 
const b2Vec2 & GetLocalAxisA () const
 The local joint axis relative to bodyA.
 
float32 GetReferenceAngle () const
 Get the reference angle.
 
float32 GetJointTranslation () const
 Get the current joint translation, usually in meters.
 
float32 GetJointSpeed () const
 Get the current joint translation speed, usually in meters per second.
 
bool IsLimitEnabled () const
 Is the joint limit enabled?
 
void EnableLimit (bool flag)
 Enable/disable the joint limit.
 
float32 GetLowerLimit () const
 Get the lower joint limit, usually in meters.
 
float32 GetUpperLimit () const
 Get the upper joint limit, usually in meters.
 
void SetLimits (float32 lower, float32 upper)
 Set the joint limits, usually in meters.
 
bool IsMotorEnabled () const
 Is the joint motor enabled?
 
void EnableMotor (bool flag)
 Enable/disable the joint motor.
 
void SetMotorSpeed (float32 speed)
 Set the motor speed, usually in meters per second.
 
float32 GetMotorSpeed () const
 Get the motor speed, usually in meters per second.
 
void SetMaxMotorForce (float32 force)
 Set the maximum motor force, usually in N.
 
float32 GetMaxMotorForce () const
 
float32 GetMotorForce (float32 inv_dt) const
 Get the current motor force given the inverse time step, usually in N.
 
void Dump ()
 Dump to b2Log.
 
- 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.
 
b2Joint * GetNext ()
 Get the next joint the world joint list.
 
const b2Joint * GetNext () 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

 b2PrismaticJoint (const b2PrismaticJointDef *def)
 
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_localAnchorA
 
b2Vec2 m_localAnchorB
 
b2Vec2 m_localXAxisA
 
b2Vec2 m_localYAxisA
 
float32 m_referenceAngle
 
b2Vec3 m_impulse
 
float32 m_motorImpulse
 
float32 m_lowerTranslation
 
float32 m_upperTranslation
 
float32 m_maxMotorForce
 
float32 m_motorSpeed
 
bool m_enableLimit
 
bool m_enableMotor
 
b2LimitState m_limitState
 
int32 m_indexA
 
int32 m_indexB
 
b2Vec2 m_localCenterA
 
b2Vec2 m_localCenterB
 
float32 m_invMassA
 
float32 m_invMassB
 
float32 m_invIA
 
float32 m_invIB
 
b2Vec2 m_axis
 
b2Vec2 m_perp
 
float32 m_s1
 
float32 m_s2
 
float32 m_a1
 
float32 m_a2
 
b2Mat33 m_K
 
float32 m_motorMass
 
- 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
 
void * m_userData
 

Friends

class b2Joint
 
class b2GearJoint
 

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 prismatic joint. This joint provides one degree of freedom: translation along an axis fixed in bodyA. Relative rotation is prevented. You can use a joint limit to restrict the range of motion and a joint motor to drive the motion or to model joint friction.

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