Physics SimulationJointDefOn this pageJointDef Description: A record that defines the properties of a joint to be created. Class Object: JointDef Class. Inherits from: Object. center Type: Field. Description: The center point of the joint, in local coordinates. Signature: center: Vec2 position Type: Field. Description: The position of the joint, in world coordinates. Signature: position: Vec2 angle Type: Field. Description: The angle of the joint, in degrees. Signature: angle: number