A gdscript that use _draw() with @tool and timer and history variable to draw a line from left to right that remember last line instead of remove and draw a new line every _draw() call

draw_history.gd

@tool
extends Control


var history := [
	Vector2(10, 10),
	Vector2(10, 500),
	Vector2(20, 10),
	Vector2(20, 500),
	]
	
var count = 0

func _draw():
	if history.size() >= 500:
		history.resize(4)
		count = 0

	var points = PackedVector2Array()
	
	for value in history:
		points.push_back(value)
		
	if points.size() > 1:
		draw_multiline(points, Color(1, 0, 0), 3)
		
	await Engine.get_main_loop().create_timer(0.001).timeout

	history.append_array([history[count] + Vector2(10, 0), history[count+1] + Vector2(10, 0)])
	count +=2
	
	#I think this like recursive(it's call _draw()) 
	queue_redraw()