| Box2D 2.2.1 A 2D Physics Engine for Games

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b2Joint Class Reference

`#include <b2Joint.h>`

Inheritance diagram for b2Joint:

List of all members.

## Public Member Functions

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.
virtual b2Vec2 | GetAnchorA () const =0
| Get the anchor point on bodyA in world coordinates.
virtual b2Vec2 | GetAnchorB () const =0
| Get the anchor point on bodyB in world coordinates.
virtual b2Vec2 | GetReactionForce (float32 inv_dt) const =0
| Get the reaction force on bodyB at the joint anchor in Newtons.
virtual float32 | GetReactionTorque (float32 inv_dt) const =0
| Get the reaction torque on bodyB in N*m.
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 | Dump ()
| Dump this joint to the log file.

## Protected Member Functions

| b2Joint (const b2JointDef *def)
virtual void | InitVelocityConstraints (const b2SolverData &data)=0
virtual void | SolveVelocityConstraints (const b2SolverData &data)=0
virtual bool | SolvePositionConstraints (const b2SolverData &data)=0

## Static Protected Member Functions

static b2Joint * | Create (const b2JointDef *def, b2BlockAllocator *allocator)
static void | Destroy (b2Joint *joint, b2BlockAllocator *allocator)

## Protected Attributes

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 | b2World
class | b2Body
class | b2Island
class | b2GearJoint

## Detailed Description

The base joint class. Joints are used to constraint two bodies together in various fashions. Some joints also feature limits and motors.

## Member Function Documentation

bool b2Joint::GetCollideConnected | ( |  | ) | const`[inline]`

Get collide connected. Note: modifying the collide connect flag won't work correctly because the flag is only checked when fixture AABBs begin to overlap.

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

- b2Joint.h
- b2Joint.cpp

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