space-invaders/scripts/game-controller.gd

extends Node2D

var game_node = null

# Called when the node enters the scene tree for the first time.
func _ready():
	get_window().grab_focus() # Replace with function body.
	game_node = get_tree().root.get_child(0)

func _process(_delta):
	# detect when one enemy goes too far
	var change_dir = false
	for child in game_node.get_children():
		if child is Enemy:
			var x = child.transform.get_origin().x
			if x < 0 or x > 600: # not using collision detection properly
				change_dir = true
				break
	
	# change directions of all enemies
	if change_dir:
		for child in game_node.get_children():
			if child is Enemy:
				child.direction *= -1
				child.go_down()