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| b2Vec2 | GetAnchorA () const | 
|  | Get the anchor point on bodyA in world coordinates. 
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|  | 
| b2Vec2 | GetAnchorB () const | 
|  | Get the anchor point on bodyB in world coordinates. 
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|  | 
| b2Vec2 | GetReactionForce (float32 inv_dt) const | 
|  | Get the reaction force on bodyB at the joint anchor in Newtons. 
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|  | 
| float32 | GetReactionTorque (float32 inv_dt) const | 
|  | Get the reaction torque on bodyB in N*m. 
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|  | 
| b2Joint * | GetJoint1 () | 
|  | Get the first joint. 
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|  | 
| b2Joint * | GetJoint2 () | 
|  | Get the second joint. 
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|  | 
| void | SetRatio (float32 ratio) | 
|  | Set/Get the gear ratio. 
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|  | 
| float32 | GetRatio () const | 
|  | 
| void | Dump () | 
|  | Dump joint to dmLog. 
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|  | 
| b2JointType | GetType () const | 
|  | Get the type of the concrete joint. 
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|  | 
| b2Body * | GetBodyA () | 
|  | Get the first body attached to this joint. 
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|  | 
| b2Body * | GetBodyB () | 
|  | Get the second body attached to this joint. 
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|  | 
| b2Joint * | GetNext () | 
|  | Get the next joint the world joint list. 
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|  | 
| const b2Joint * | GetNext () const | 
|  | 
| void * | GetUserData () const | 
|  | Get the user data pointer. 
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|  | 
| void | SetUserData (void *data) | 
|  | Set the user data pointer. 
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|  | 
| bool | IsActive () const | 
|  | Short-cut function to determine if either body is inactive. 
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|  | 
| bool | GetCollideConnected () const | 
|  | 
| virtual void | ShiftOrigin (const b2Vec2 &newOrigin) | 
|  | Shift the origin for any points stored in world coordinates. 
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|  | 
A gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear ratio to bind the motions together: coordinate1 + ratio * coordinate2 = constant The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length. 
- Warning
- You have to manually destroy the gear joint if joint1 or joint2 is destroyed.