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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.
float initial_offset =
The body B's initial anchor position defined by the joint's origin and a local offset initial_offset along the joint's Y axis (along the groove).
float length =
The groove's length. The groove is from the joint's origin towards length along the joint's local Y axis.