Curve movement : Determines the behaviour corresponding to the path you set (@Curve : BulletPattern is a child node of the Path2D node. You can draw a path like you’d do with the Path2D. Doing so will tell the bullets to follow this path instead of a straight line once they’re shot. Useful if you want your bullets to have very complex/custom movement. ). Once the bullet reached the end of the path, it can have multiple behaviors

OnceThenStay : continue on a straight line
OnceThenDelete : be destroyed
OnceThenStop : stay in place
LoopFromStart : loop back following the path again from its starting position
LoopFromEnd : repeat the curve from its current position