How can i make this effect?

Question

I want my weapon sprite to have a movement like this. I tried to do it but i didn't make it. How can i do it?
https://www.youtube.com/watch?v=EosAcVKZiMk

btw here is my gun code:

extends Control

onready var anim_player = $AnimationPlayer

var can_shoot = true

# Weapon sway
var MoveAmount = .5
var MoveSpeed = 20

var _origin = rect_position

func _ready():
    anim_player.play("idle")

func _physics_process(delta):
    if Input.is_action_pressed("shoot") and can_shoot:
        anim_player.play("shoot")

    var mouse_position = get_viewport().get_mouse_position()

    var moveOnX = mouse_position.x * MoveAmount
    var moveOnY = mouse_position.y * MoveAmount

    var newPos = Vector2(moveOnX, _origin.y + moveOnY)

    _origin = lerp(_origin, newPos, MoveSpeed)

Comments

What effect are you talking about? A weapon (and the appendage to which it is attached) being affected by the motion of the player's movements? Maybe this video from Garbaj would help?

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it workedddddddddd thxxxxx!!!!!!!!!!!!!!!!!!!!!!!11!1