PackageBox2D.Dynamics.Joints
Classpublic class b2GearJoint
Inheritanceb2GearJoint Inheritance b2Joint
Sourceb2GearJoint.as

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: The revolute and prismatic joints must be attached to fixed bodies (which must be body1 on those joints).

See also

b2GearJointDef

Public Methods
 MethodDefined by
  
GetAnchorA():b2Vec2
Get the anchor point on bodyA in world coordinates.
b2GearJoint
  
GetAnchorB():b2Vec2
Get the anchor point on bodyB in world coordinates.
b2GearJoint
 Inherited
GetBodyA():b2Body
Get the first body attached to this joint.
b2Joint
 Inherited
GetBodyB():b2Body
Get the second body attached to this joint.
b2Joint
 Inherited
GetNext():b2Joint
Get the next joint the world joint list.
b2Joint
  
GetRatio():Number
Get the gear ratio.
b2GearJoint
  
GetReactionForce(inv_dt:Number):b2Vec2
Get the reaction force on body2 at the joint anchor in Newtons.
b2GearJoint
  
GetReactionTorque(inv_dt:Number):Number
Get the reaction torque on body2 in N.
b2GearJoint
 Inherited
GetType():int
Get the type of the concrete joint.
b2Joint
 Inherited
GetUserData():*
Get the user data pointer.
b2Joint
 Inherited
IsActive():Boolean
Short-cut function to determine if either body is inactive.
b2Joint
  
SetRatio(ratio:Number):void
Set the gear ratio.
b2GearJoint
 Inherited
SetUserData(data:*):void
Set the user data pointer.
b2Joint
Method detail
GetAnchorA()method
public override function GetAnchorA():b2Vec2

Get the anchor point on bodyA in world coordinates.

Returns
b2Vec2
GetAnchorB()method 
public override function GetAnchorB():b2Vec2

Get the anchor point on bodyB in world coordinates.

Returns
b2Vec2
GetRatio()method 
public function GetRatio():Number

Get the gear ratio.

Returns
Number
GetReactionForce()method 
public override function GetReactionForce(inv_dt:Number):b2Vec2

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

Parameters
inv_dt:Number

Returns
b2Vec2
GetReactionTorque()method 
public override function GetReactionTorque(inv_dt:Number):Number

Get the reaction torque on body2 in N.

Parameters
inv_dt:Number

Returns
Number
SetRatio()method 
public function SetRatio(ratio:Number):void

Set the gear ratio.

Parameters
ratio:Number



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