Godot Simple Trail Parcticle

trail.gd

extends Node2D

export(int) var track_length = 10
export(int) var update_delay_frames = 0
var track_delay_counter = 0
var track = Vector2Array()

func _ready():
	var pos = get_global_transform().get_origin()
	for i in range(self.track_length):
		self.track.append(pos)

func _init():
	set_fixed_process(true)
	
func _fixed_process(delta):
	print('Delta: ', delta)
	self.track_delay_counter += delta
	var total_time_delay = self.update_delay_frames * get_process_delta_time()
	if(self.track_delay_counter >= total_time_delay):
		add_position(get_global_transform().get_origin())
		self.update()
		self.track_delay_counter = 0

func _draw():
	self.draw_trail()

func add_position(new_position):
	if( self.track.size() == self.track_length ):
		self.track.remove(0)
	self.track.append(new_position)

func draw_trail():
	draw_set_transform( - get_global_transform().get_origin(), 0, Vector2(1,1))
	for i in range(self.track_length -1):
		draw_line(self.track[i], self.track[i+1], Color(1, 0, 0), 2*i)
	
	draw_line(self.track[self.track_length -1], get_global_transform().get_origin(), Color(1, 0, 0), 2)