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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 b2Vec2GetLocalAnchorA () const
 The local anchor point relative to bodyA's origin.
const b2Vec2GetLocalAnchorB () const
 The local anchor point relative to bodyB's origin.
const b2Vec2GetLocalAxisA () 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.
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

 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
b2JointEdge m_edgeA
b2JointEdge m_edgeB
int32 m_index
bool m_islandFlag
bool m_collideConnected
void * m_userData


class b2Joint
class b2GearJoint

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 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: