b2DistanceJoint Class Reference

#include <b2DistanceJoint.h>

Inheritance diagram for b2DistanceJoint:
b2Joint

List of all members.

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 body2 at the joint anchor in Newtons.
float32 GetReactionTorque (float32 inv_dt) const
 Get the reaction torque on body2 in N*m.
void SetLength (float32 length)
float32 GetLength () const
void SetFrequency (float32 hz)
float32 GetFrequency () const
void SetDampingRatio (float32 ratio)
float32 GetDampingRatio () const

Protected Member Functions

 b2DistanceJoint (const b2DistanceJointDef *data)
void InitVelocityConstraints (const b2TimeStep &step)
void SolveVelocityConstraints (const b2TimeStep &step)
bool SolvePositionConstraints (float32 baumgarte)

Protected Attributes

b2Vec2 m_localAnchor1
b2Vec2 m_localAnchor2
b2Vec2 m_u
float32 m_frequencyHz
float32 m_dampingRatio
float32 m_gamma
float32 m_bias
float32 m_impulse
float32 m_mass
float32 m_length

Friends

class b2Joint

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.


Constructor & Destructor Documentation

b2DistanceJoint::b2DistanceJoint ( const b2DistanceJointDef data  )  [protected]

Member Function Documentation

b2Vec2 b2DistanceJoint::GetAnchorA (  )  const [virtual]

Get the anchor point on bodyA in world coordinates.

Implements b2Joint.

b2Vec2 b2DistanceJoint::GetAnchorB (  )  const [virtual]

Get the anchor point on bodyB in world coordinates.

Implements b2Joint.

float32 b2DistanceJoint::GetDampingRatio (  )  const [inline]
float32 b2DistanceJoint::GetFrequency (  )  const [inline]
float32 b2DistanceJoint::GetLength (  )  const [inline]
b2Vec2 b2DistanceJoint::GetReactionForce ( float32  inv_dt  )  const [virtual]

Get the reaction force on body2 at the joint anchor in Newtons.

Implements b2Joint.

float32 b2DistanceJoint::GetReactionTorque ( float32  inv_dt  )  const [virtual]

Get the reaction torque on body2 in N*m.

Implements b2Joint.

void b2DistanceJoint::InitVelocityConstraints ( const b2TimeStep step  )  [protected, virtual]

Implements b2Joint.

void b2DistanceJoint::SetDampingRatio ( float32  ratio  )  [inline]
void b2DistanceJoint::SetFrequency ( float32  hz  )  [inline]
void b2DistanceJoint::SetLength ( float32  length  )  [inline]

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

bool b2DistanceJoint::SolvePositionConstraints ( float32  baumgarte  )  [protected, virtual]

Implements b2Joint.

void b2DistanceJoint::SolveVelocityConstraints ( const b2TimeStep step  )  [protected, virtual]

Implements b2Joint.


Friends And Related Function Documentation

friend class b2Joint [friend]

Member Data Documentation


The documentation for this class was generated from the following files:
Generated on Sat Apr 3 18:18:09 2010 for Box2D by  doxygen 1.6.3