All Classes Files Functions Variables Typedefs Enumerations Enumerator Macros Pages
Public Member Functions | Protected Member Functions | Protected Attributes | Friends | List of all members
b2DistanceJoint Class Reference

#include <b2DistanceJoint.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
float32 GetReactionTorque (float32 inv_dt) const
const b2Vec2GetLocalAnchorA () const
 The local anchor point relative to bodyA's origin.
const b2Vec2GetLocalAnchorB () const
 The local anchor point relative to bodyB's origin.
void SetLength (float32 length)
float32 GetLength () const
void SetFrequency (float32 hz)
 Set/get frequency in Hz.
float32 GetFrequency () const
void SetDampingRatio (float32 ratio)
 Set/get damping ratio.
float32 GetDampingRatio () 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

 b2DistanceJoint (const b2DistanceJointDef *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

float32 m_frequencyHz
float32 m_dampingRatio
float32 m_bias
b2Vec2 m_localAnchorA
b2Vec2 m_localAnchorB
float32 m_gamma
float32 m_impulse
float32 m_length
int32 m_indexA
int32 m_indexB
b2Vec2 m_u
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

A distance joint constrains two points on two bodies to remain at a fixed distance from each other. You can view this as a massless, rigid rod.

Member Function Documentation

b2Vec2 b2DistanceJoint::GetReactionForce ( float32  inv_dt) const

Get the reaction force given the inverse time step. Unit is N.

Implements b2Joint.

float32 b2DistanceJoint::GetReactionTorque ( float32  inv_dt) const

Get the reaction torque given the inverse time step. Unit is N*m. This is always zero for a distance joint.

Implements b2Joint.

void b2DistanceJoint::SetLength ( float32  length)

Set/get the natural length. Manipulating the length can lead to non-physical behavior when the frequency is zero.

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