[NoDelete]
interface b2Contact {
  b2Manifold GetManifold();
  boolean IsTouching();
  void SetEnabled(boolean flag);
  boolean IsEnabled();
  b2Contact GetNext();
  b2Fixture GetFixtureA();
  long GetChildIndexA();
  b2Fixture GetFixtureB();
  long GetChildIndexB();
  void SetFriction(float friction);
  float GetFriction();
  void ResetFriction();
  void SetRestitution(float restitution);
  float GetRestitution();
  void ResetRestitution();
};

interface b2ContactListener {
};

[JSImplementation="b2ContactListener"]
interface JSContactListener {
  void JSContactListener();

  void BeginContact(b2Contact contact);
  void EndContact(b2Contact contact);
  // TODO: Declare another b2ContactListener implementation without PreSolve/PostSolve,
  // for efficiency (otherwise the JS implementations of these functions must get called
  // even if unused).
  void PreSolve(b2Contact contact, [Const] b2Manifold oldManifold);
  void PostSolve(b2Contact contact, [Const] b2ContactImpulse impulse);
};

interface b2World {
  void b2World([Const, Ref] b2Vec2 gravity);
  void SetDestructionListener(b2DestructionListener listener);
  void SetContactFilter(JSContactFilter filter);
  void SetContactListener(JSContactListener listener);
  void SetDebugDraw(b2Draw debugDraw);
  b2Body CreateBody([Const] b2BodyDef def);
  void DestroyBody(b2Body body);
  b2Joint CreateJoint([Const] b2JointDef def);
  void DestroyJoint(b2Joint joint);
  void Step(float timeStep, long velocityIterations, long positionIterations);
  void ClearForces();
  void DrawDebugData();
  void QueryAABB(b2QueryCallback callback, [Ref] b2AABB aabb);
  void RayCast(b2RayCastCallback callback, [Ref] b2Vec2 point1, [Ref] b2Vec2 point2);
  b2Body GetBodyList();
  b2Joint GetJointList();
  b2Contact GetContactList();
  void SetAllowSleeping(boolean flag);
  boolean GetAllowSleeping();
  void SetWarmStarting(boolean flag);
  boolean GetWarmStarting();
  void SetContinuousPhysics(boolean flag);
  boolean GetContinuousPhysics();
  void SetSubStepping(boolean flag);
  boolean GetSubStepping();
  long GetProxyCount();
  long GetBodyCount();
  long GetJointCount();
  long GetContactCount();
  long GetTreeHeight();
  long GetTreeBalance();
  float GetTreeQuality();
  void SetGravity([Ref] b2Vec2 gravity);
  [Value] b2Vec2 GetGravity();
  boolean IsLocked();
  void SetAutoClearForces(boolean flag);
  boolean GetAutoClearForces();
  [Const, Ref] b2Profile GetProfile();
  void Dump();
};

enum b2ShapeType {
  "b2Shape::e_circle",
  "b2Shape::e_edge",
  "b2Shape::e_polygon",
  "b2Shape::e_chain",
  "b2Shape::e_typeCount"
};

interface b2Shape {
  b2ShapeType GetType();
  long GetChildCount();
  boolean TestPoint([Ref] b2Transform xf, [Ref] b2Vec2 p);
  boolean RayCast(b2RayCastOutput output, [Ref] b2RayCastInput input,
                  [Ref] b2Transform transform, long childIndex);
  void ComputeAABB(b2AABB aabb, [Ref] b2Transform xf, long childIndex);
  void ComputeMass(b2MassData massData, float density);

  attribute b2ShapeType m_type;
  attribute float m_radius;
};

interface b2FixtureDef {
  void b2FixtureDef();
  [Const] attribute b2Shape shape;
  attribute any userData;
  attribute float friction;
  attribute float restitution;
  attribute float density;
  attribute boolean isSensor;
  [Value] attribute b2Filter filter;
};

interface b2Fixture {
  b2ShapeType GetType();
  b2Shape GetShape();
  void SetSensor(boolean sensor);
  boolean IsSensor();
  void SetFilterData([Ref] b2Filter filter);
  [Const, Ref] b2Filter GetFilterData();
  void Refilter();
  b2Body GetBody();
  b2Fixture GetNext();
  any GetUserData();
  void SetUserData(any data);
  boolean TestPoint([Ref] b2Vec2 p);
  boolean RayCast(b2RayCastOutput output, [Ref] b2RayCastInput input, long childIndex);
  void GetMassData(b2MassData massData);
  void SetDensity(float density);
  float GetDensity();
  float GetFriction();
  void SetFriction(float friction);
  float GetRestitution();
  void SetRestitution(float restitution);
  [Const, Ref] b2AABB GetAABB(long childIndex);
  void Dump(long bodyIndex);
};

interface b2Transform {
  void b2Transform();
  void b2Transform([Ref] b2Vec2 position, [Ref] b2Rot rotation);
  void SetIdentity();
  void Set([Ref] b2Vec2 position, float angle);
  [Value] attribute b2Vec2 p;
  [Value] attribute b2Rot q;
};


interface b2RayCastCallback {
};
[JSImplementation="b2RayCastCallback"]
interface JSRayCastCallback {
  void JSRayCastCallback();
  float ReportFixture(b2Fixture fixture, [Const, Ref] b2Vec2 point,
                      [Const, Ref] b2Vec2 normal, float fraction);
};

interface b2QueryCallback {
};
[JSImplementation="b2QueryCallback"]
interface JSQueryCallback {
  void JSQueryCallback();
  boolean ReportFixture(b2Fixture fixture);
};

interface b2MassData {
  void b2MassData();
  attribute float mass;
  [Value] attribute b2Vec2 center;
  attribute float I;
};

interface b2Vec2 {
  void b2Vec2();
  void b2Vec2(float x, float y);
  void SetZero();
  void Set(float x, float y);
  [Operator="+="] void op_add([Const, Ref] b2Vec2 v);
  [Operator="-="] void op_sub([Const, Ref] b2Vec2 v);
  [Operator="*="] void op_mul(float s);
  float Length();
  float LengthSquared();
  float Normalize();
  boolean IsValid();
  [Value] b2Vec2 Skew();
  attribute float x;
  attribute float y;
};

interface b2Vec3 {
  void b2Vec3();
  void b2Vec3(float x, float y, float z);
  void SetZero();
  void Set(float x, float y, float z);
  [Operator="+="] void op_add([Const, Ref] b2Vec3 v);
  [Operator="-="] void op_sub([Const, Ref] b2Vec3 v);
  [Operator="*="] void op_mul(float s);
  attribute float x;
  attribute float y;
  attribute float z;
};

[NoDelete]
interface b2Body {
  b2Fixture CreateFixture(b2FixtureDef def);
  b2Fixture CreateFixture(b2Shape shape, float density);
  void DestroyFixture(b2Fixture fixture);
  void SetTransform([Ref] b2Vec2 position, float angle);
  [Const, Ref] b2Transform GetTransform();
  [Const, Ref] b2Vec2 GetPosition();
  float GetAngle();
  [Const, Ref] b2Vec2 GetWorldCenter();
  [Const, Ref] b2Vec2 GetLocalCenter();
  void SetLinearVelocity([Ref] b2Vec2 v);
  [Value] b2Vec2 GetLinearVelocity();
  void SetAngularVelocity(float omega);
  float GetAngularVelocity();
  void ApplyForce([Ref] b2Vec2 force, [Ref] b2Vec2 point);
  void ApplyForceToCenter([Ref] b2Vec2 force);
  void ApplyTorque(float torque);
  void ApplyLinearImpulse([Ref] b2Vec2 impulse, [Ref] b2Vec2 point);
  void ApplyAngularImpulse(float impulse);
  float GetMass();
  float GetInertia();
  void GetMassData(b2MassData data);
  void SetMassData(b2MassData data);
  void ResetMassData();
  [Value] b2Vec2 GetWorldPoint([Ref] b2Vec2 localPoint);
  [Value] b2Vec2 GetWorldVector([Ref] b2Vec2 localVector);
  [Value] b2Vec2 GetLocalPoint([Ref] b2Vec2 worldPoint);
  [Value] b2Vec2 GetLocalVector([Ref] b2Vec2 worldVector);
  [Value] b2Vec2 GetLinearVelocityFromWorldPoint([Ref] b2Vec2 worldPoint);
  [Value] b2Vec2 GetLinearVelocityFromLocalPoint([Ref] b2Vec2 localPoint);
  float GetLinearDamping();
  void SetLinearDamping(float linearDamping);
  float GetAngularDamping();
  void SetAngularDamping(float angularDamping);
  float GetGravityScale();
  void SetGravityScale(float scale);
  void SetType(b2BodyType type);
  b2BodyType GetType();
  void SetBullet(boolean flag);
  boolean IsBullet();
  void SetSleepingAllowed(boolean flag);
  boolean IsSleepingAllowed();
  void SetAwake(boolean flag);
  boolean IsAwake();
  void SetActive(boolean flag);
  boolean IsActive();
  void SetFixedRotation(boolean flag);
  boolean IsFixedRotation();
  b2Fixture GetFixtureList();
  b2JointEdge GetJointList();
  b2ContactEdge GetContactList();
  b2Body GetNext();
  any GetUserData();
  void SetUserData(any data);
  b2World GetWorld();
  void Dump();
};

enum b2BodyType {
  "b2_staticBody",
  "b2_kinematicBody",
  "b2_dynamicBody"
};

interface b2BodyDef {
  void b2BodyDef();

  attribute b2BodyType type;
  [Value] attribute b2Vec2 position;
  attribute float angle;
  [Value] attribute b2Vec2 linearVelocity;
  attribute float angularVelocity;
  attribute float linearDamping;
  attribute float angularDamping;
  attribute boolean allowSleep;
  attribute boolean awake;
  attribute boolean fixedRotation;
  attribute boolean bullet;
  attribute boolean active;
  attribute any userData;
  attribute float gravityScale;
};

interface b2Filter {
  void b2Filter();
  attribute unsigned short categoryBits;
  attribute unsigned short maskBits;
  attribute short groupIndex;
};

interface b2AABB {
  void b2AABB();
  boolean IsValid();
  [Value] b2Vec2 GetCenter();
  [Value] b2Vec2 GetExtents();
  float GetPerimeter();
  void Combine([Ref] b2AABB aabb);
  void Combine([Ref] b2AABB aabb1, [Ref] b2AABB aabb2);
  boolean Contains([Ref] b2AABB aabb);
  boolean RayCast(b2RayCastOutput output, [Ref] b2RayCastInput input);
  [Value] attribute b2Vec2 lowerBound;
  [Value] attribute b2Vec2 upperBound;
};

interface b2CircleShape {
  void b2CircleShape();
  [Value] attribute b2Vec2 m_p;
};

b2CircleShape implements b2Shape;

interface b2EdgeShape {
  void b2EdgeShape();
  void Set([Ref] b2Vec2 v1, [Ref] b2Vec2 v2);

  [Value] attribute b2Vec2 m_vertex1;
  [Value] attribute b2Vec2 m_vertex2;
  [Value] attribute b2Vec2 m_vertex0;
  [Value] attribute b2Vec2 m_vertex3;
  attribute boolean m_hasVertex0;
  attribute boolean m_hasVertex3;
};

b2EdgeShape implements b2Shape;

enum b2JointType {
  "e_unknownJoint",
  "e_revoluteJoint",
  "e_prismaticJoint",
  "e_distanceJoint",
  "e_pulleyJoint",
  "e_mouseJoint",
  "e_gearJoint",
  "e_wheelJoint",
  "e_weldJoint",
  "e_frictionJoint",
  "e_ropeJoint"
};

enum b2LimitState {
  "e_inactiveLimit",
  "e_atLowerLimit",
  "e_atUpperLimit",
  "e_equalLimits"
};

interface b2JointDef {
  void b2JointDef();
  attribute b2JointType type;
  attribute any userData;
  attribute b2Body bodyA;
  attribute b2Body bodyB;
  attribute boolean collideConnected;
};

[NoDelete]
interface b2Joint {
  b2JointType GetType();
  b2Body GetBodyA();
  b2Body GetBodyB();
  [Value] b2Vec2 GetAnchorA();
  [Value] b2Vec2 GetAnchorB();
  [Value] b2Vec2 GetReactionForce(float inv_dt);
  float GetReactionTorque(float inv_dt);
  b2Joint GetNext();
  any GetUserData();
  void SetUserData(any data);
  boolean IsActive();
  boolean GetCollideConnected();
  void Dump();
};

interface b2WeldJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  void SetFrequency(float hz);
  float GetFrequency();
  void SetDampingRatio(float ratio);
  float GetDampingRatio();
  void Dump();
};

b2WeldJoint implements b2Joint;

interface b2WeldJointDef {
  void b2WeldJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 anchor);
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  attribute float referenceAngle;
  attribute float frequencyHz;
  attribute float dampingRatio;
};

b2WeldJointDef implements b2JointDef;

interface b2ChainShape {
  void b2ChainShape();
  void CreateLoop(b2Vec2 vertices, long count);
  void CreateChain(b2Vec2 vertices, long count);
  void SetPrevVertex([Ref] b2Vec2 prevVertex);
  void SetNextVertex([Ref] b2Vec2 nextVertex);
  void GetChildEdge(b2EdgeShape edge, long index);

  attribute b2Vec2 m_vertices;
  attribute long m_count;
  [Value] attribute b2Vec2 m_prevVertex;
  [Value] attribute b2Vec2 m_nextVertex;
  attribute boolean m_hasPrevVertex;
  attribute boolean m_hasNextVertex;
};

b2ChainShape implements b2Shape;

interface b2Color {
  void b2Color();
  void b2Color(float r, float g, float b);
  void Set(float ri, float gi, float bi);

  attribute float r;
  attribute float g;
  attribute float b;
};

interface b2ContactEdge {
  void b2ContactEdge();
  attribute b2Body other;
  attribute b2Contact contact;
  attribute b2ContactEdge prev;
  attribute b2ContactEdge next;
};

enum b2ContactFeatureType {
  "b2ContactFeature::e_vertex",
  "b2ContactFeature::e_face"
};

interface b2ContactFeature {
  attribute octet indexA;
  attribute octet indexB;
  attribute octet typeA;
  attribute octet typeB;
};

interface b2ContactFilter {
};

[JSImplementation="b2ContactFilter"]
interface JSContactFilter {
  void JSContactFilter();
  boolean ShouldCollide(b2Fixture fixtureA, b2Fixture fixtureB);
};

interface b2ContactID {
  [Value] attribute b2ContactFeature cf;
  attribute unsigned long key;
};

interface b2ContactImpulse {
  // TODO: webidl_binder support for array types.
  // attribute float[] normalImpulses;
  // attribute float[] tangentImpulses;
  attribute long count;
};

interface b2DestructionListener {
};

interface b2DestructionListenerWrapper {
};

[JSImplementation="b2DestructionListenerWrapper"]
interface JSDestructionListener {
  void JSDestructionListener();
  // These methods map the overloaded methods from b2DestructionListener onto differently-named
  // methods, so that it is possible to implement both of them in JS.
  void SayGoodbyeJoint(b2Joint joint);
  void SayGoodbyeFixture(b2Fixture joint);
};

interface b2DistanceJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  void SetLength(float length);
  float GetLength();
  void SetFrequency(float hz);
  float GetFrequency();
  void SetDampingRatio(float ratio);
  float GetDampingRatio();
};

b2DistanceJoint implements b2Joint;

interface b2DistanceJointDef {
  void b2DistanceJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 anchorA, [Ref] b2Vec2 anchorB);
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  attribute float length;
  attribute float frequencyHz;
  attribute float dampingRatio;
};

b2DistanceJointDef implements b2JointDef;

enum b2DrawFlag {
  "b2Draw::e_shapeBit",
  "b2Draw::e_jointBit",
  "b2Draw::e_aabbBit",
  "b2Draw::e_pairBit",
  "b2Draw::e_centerOfMassBit"
};

interface b2Draw {
  void SetFlags(unsigned long flags);
  unsigned long GetFlags();
  void AppendFlags(unsigned long flags);
  void ClearFlags(unsigned long flags);
};

[JSImplementation="b2Draw"]
interface JSDraw {
  void JSDraw();
  void DrawPolygon([Const] b2Vec2 vertices, long vertexCount, [Const, Ref] b2Color color);
  void DrawSolidPolygon([Const] b2Vec2 vertices, long vertexCount, [Const, Ref] b2Color color);
  void DrawCircle([Const, Ref] b2Vec2 center, float radius, [Const, Ref] b2Color color);
  void DrawSolidCircle([Const, Ref] b2Vec2 center, float radius, [Const, Ref] b2Vec2 axis, [Const, Ref] b2Color color);
  void DrawSegment([Const, Ref] b2Vec2 p1, [Const, Ref] b2Vec2 p2, [Const, Ref] b2Color color);
  void DrawTransform([Const, Ref] b2Transform xf);
};

interface b2FrictionJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  void SetMaxForce(float force);
  float GetMaxForce();
  void SetMaxTorque(float torque);
  float GetMaxTorque();
};

b2FrictionJoint implements b2Joint;

interface b2FrictionJointDef {
  void b2FrictionJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 anchor);
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  attribute float maxForce;
  attribute float maxTorque;
};

b2FrictionJointDef implements b2JointDef;

interface b2GearJoint {
  b2Joint GetJoint1();
  b2Joint GetJoint2();
  void SetRatio(float ratio);
  float GetRatio();
};

b2GearJoint implements b2Joint;

interface b2GearJointDef {
  void b2GearJointDef();
  attribute b2Joint joint1;
  attribute b2Joint joint2;
  attribute float ratio;
};

b2GearJointDef implements b2JointDef;

interface b2JointEdge {
  void b2JointEdge();
  attribute b2Body other;
  attribute b2Joint joint;
  attribute b2JointEdge prev;
  attribute b2JointEdge next;
};

enum b2ManifoldType {
  "b2Manifold::e_circles",
  "b2Manifold::e_faceA",
  "b2Manifold::e_faceB"
};

interface b2Manifold {
  void b2Manifold();
  // TODO: webidl_binder support for array types.
  // [Value] attribute b2ManifoldPoint[] points;
  [Value] attribute b2Vec2 localNormal;
  [Value] attribute b2Vec2 localPoint;
  attribute b2ManifoldType type;
  attribute long pointCount;
};

interface b2ManifoldPoint {
  void b2ManifoldPoint();
  [Value] attribute b2Vec2 localPoint;
  attribute float normalImpulse;
  attribute float tangentImpulse;
  [Value] attribute b2ContactID id;
};

interface b2Mat22 {
  void b2Mat22();
  void b2Mat22([Ref] b2Vec2 c1, [Ref] b2Vec2 c2);
  void b2Mat22(float a11, float a12, float a21, float a22);
  void Set([Ref] b2Vec2 c1, [Ref] b2Vec2 c2);
  void SetIdentity();
  void SetZero();
  [Value] b2Mat22 GetInverse();
  [Value] b2Vec2 Solve([Ref] b2Vec2 b);

  [Value] attribute b2Vec2 ex;
  [Value] attribute b2Vec2 ey;
};

interface b2Mat33 {
  void b2Mat33();
  void b2Mat33([Ref] b2Vec3 c1, [Ref] b2Vec3 c2, [Ref] b2Vec3 c3);
  void SetZero();
  [Value] b2Vec3 Solve33([Ref] b2Vec3 b);
  [Value] b2Vec2 Solve22([Ref] b2Vec2 b);
  void GetInverse22(b2Mat33 M);
  void GetSymInverse33(b2Mat33 M);

  [Value] attribute b2Vec3 ex;
  [Value] attribute b2Vec3 ey;
  [Value] attribute b2Vec3 ez;
};

interface b2MouseJoint {
  void SetTarget([Ref] b2Vec2 target);
  [Const, Ref] b2Vec2 GetTarget();
  void SetMaxForce(float force);
  float GetMaxForce();
  void SetFrequency(float hz);
  float GetFrequency();
  void SetDampingRatio(float ratio);
  float GetDampingRatio();
};

b2MouseJoint implements b2Joint;

interface b2MouseJointDef {
  void b2MouseJointDef();
  [Value] attribute b2Vec2 target;
  attribute float maxForce;
  attribute float frequencyHz;
  attribute float dampingRatio;
};

b2MouseJointDef implements b2JointDef;

interface b2PolygonShape {
  void b2PolygonShape();
  void Set(b2Vec2 vertices, long vertexCount);
  void SetAsBox(float hx, float hy);
  void SetAsBox(float hx, float hy, [Ref] b2Vec2 center, float angle);
  long GetVertexCount();
  [Const, Ref] b2Vec2 GetVertex(long index);
  [Value] attribute b2Vec2 m_centroid;

  // TODO: webidl_binder support for array types.
  //[Value] attribute b2Vec2[] m_vertices;
  //[Value] attribute b2Vec2[] m_normals;

  attribute long m_vertexCount;
};

b2PolygonShape implements b2Shape;

interface b2PrismaticJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  [Const, Ref] b2Vec2 GetLocalAxisA();
  float GetReferenceAngle();
  float GetJointTranslation();
  float GetJointSpeed();
  boolean IsLimitEnabled();
  void EnableLimit(boolean flag);
  float GetLowerLimit();
  float GetUpperLimit();
  void SetLimits(float lower, float upper);
  boolean IsMotorEnabled();
  void EnableMotor(boolean flag);
  void SetMotorSpeed(float speed);
  float GetMotorSpeed();
  void SetMaxMotorForce(float force);
  float GetMaxMotorForce();
  float GetMotorForce(float inv_dt);
};

b2PrismaticJoint implements b2Joint;

interface b2PrismaticJointDef {
  void b2PrismaticJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 anchor, [Ref] b2Vec2 axis);
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  [Value] attribute b2Vec2 localAxisA;
  attribute float referenceAngle;
  attribute boolean enableLimit;
  attribute float lowerTranslation;
  attribute float upperTranslation;
  attribute boolean enableMotor;
  attribute float maxMotorForce;
  attribute float motorSpeed;
};

b2PrismaticJointDef implements b2JointDef;

interface b2Profile {
  attribute float step;
  attribute float collide;
  attribute float solve;
  attribute float solveInit;
  attribute float solveVelocity;
  attribute float solvePosition;
  attribute float broadphase;
  attribute float solveTOI;
};

interface b2PulleyJoint {
  [Value] b2Vec2 GetGroundAnchorA();
  [Value] b2Vec2 GetGroundAnchorB();
  float GetLengthA();
  float GetLengthB();
  float GetRatio();
};

b2PulleyJoint implements b2Joint;

interface b2PulleyJointDef {
  void b2PulleyJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 groundAnchorA, [Ref] b2Vec2 groundAnchorB,
                  [Ref] b2Vec2 anchorA, [Ref] b2Vec2 anchorB, float ratio);
  [Value] attribute b2Vec2 groundAnchorA;
  [Value] attribute b2Vec2 groundAnchorB;
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  attribute float lengthA;
  attribute float lengthB;
  attribute float ratio;
};

b2PulleyJointDef implements b2JointDef;


interface b2RayCastInput {
  [Value] attribute b2Vec2 p1;
  [Value] attribute b2Vec2 p2;
  attribute float maxFraction;
};

interface b2RayCastOutput {
  [Value] attribute b2Vec2 normal;
  attribute float fraction;
};
interface b2RevoluteJointDef {
  void b2RevoluteJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 anchor);
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  attribute float referenceAngle;
  attribute boolean enableLimit;
  attribute float lowerAngle;
  attribute float upperAngle;
  attribute boolean enableMotor;
  attribute float motorSpeed;
  attribute float maxMotorTorque;
};

b2RevoluteJointDef implements b2JointDef;

interface b2RevoluteJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  float GetReferenceAngle();
  float GetJointAngle();
  float GetJointSpeed();
  boolean IsLimitEnabled();
  void EnableLimit(boolean flag);
  float GetLowerLimit();
  float GetUpperLimit();
  void SetLimits(float lower, float upper);
  boolean IsMotorEnabled();
  void EnableMotor(boolean flag);
  void SetMotorSpeed(float speed);
  float GetMotorSpeed();
  void SetMaxMotorTorque(float torque);
  float GetMaxMotorTorque();
  float GetMotorTorque(float inv_dt);
};

b2RevoluteJoint implements b2Joint;



interface b2RopeJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  void SetMaxLength(float length);
  float GetMaxLength();
  b2LimitState GetLimitState();
};

b2RopeJoint implements b2Joint;

interface b2RopeJointDef {
  void b2RopeJointDef();
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  attribute float maxLength;
};
b2RopeJointDef implements b2JointDef;

interface b2Rot {
  void b2Rot();
  void b2Rot(float angle);
  void Set(float angle);
  void SetIdentity();
  float GetAngle();
  [Value] b2Vec2 GetXAxis();
  [Value] b2Vec2 GetYAxis();
  attribute float s;
  attribute float c;
};

interface b2WheelJoint {
  [Const, Ref] b2Vec2 GetLocalAnchorA();
  [Const, Ref] b2Vec2 GetLocalAnchorB();
  [Const, Ref] b2Vec2 GetLocalAxisA();
  float GetJointTranslation();
  float GetJointSpeed();
  boolean IsMotorEnabled();
  void EnableMotor(boolean flag);
  void SetMotorSpeed(float speed);
  float GetMotorSpeed();
  void SetMaxMotorTorque(float torque);
  float GetMaxMotorTorque();
  float GetMotorTorque(float inv_dt);
  void SetSpringFrequencyHz(float hz);
  float GetSpringFrequencyHz();
  void SetSpringDampingRatio(float ratio);
  float GetSpringDampingRatio();
};

b2WheelJoint implements b2Joint;

interface b2WheelJointDef {
  void b2WheelJointDef();
  void Initialize(b2Body bodyA, b2Body bodyB, [Ref] b2Vec2 anchor, [Ref] b2Vec2 axis);
  [Value] attribute b2Vec2 localAnchorA;
  [Value] attribute b2Vec2 localAnchorB;
  [Value] attribute b2Vec2 localAxisA;
  attribute boolean enableMotor;
  attribute float maxMotorTorque;
  attribute float motorSpeed;
  attribute float frequencyHz;
  attribute float dampingRatio;
};

b2WheelJointDef implements b2JointDef;