A physics joint that restricts the movement of two 2D physics bodies to a fixed axis.
A physics joint that restricts the movement of two 2D physics bodies to a fixed axis. For example, a [StaticBody2D] representing a piston base can be attached to a [RigidBody2D] representing the piston head, moving up and down.
- The body B's initial anchor position defined by the joint's origin and a local offset [member initial_offset] along the joint's Y axis (along the groove).
- The groove's length. The groove is from the joint's origin towards [member length] along the joint's local Y axis.