GDScript Helper for Flipping Physics Objects - Godot 3

flip_helper.gd

extends Object

var flip_h = false
var flip_v = false
var node = null


func _init(node):
	self.node = node


func get_flip_h():
	return flip_h


func set_flip_h(enable):
	if enable == flip_h:
		return

	flip_h = enable
	h_flip_children()


func get_flip_v():
	return flip_v


func set_flip_v(enable):
	if enable == flip_v:
		return

	flip_v = enable
	v_flip_children()


func h_flip_children():
	for n in node.get_children():
		if not (n is Node2D):
			continue
		
		if n is CollisionShape2D or n is CollisionObject2D:
			n.rotation = -2.0 * n.rotation
		else:
			if flip_h:
				n.scale = Vector2(-1, 1)
			else:
				n.scale = Vector2(1, 1)
			
		var pos = n.position
		n.translate(Vector2(-2.0 * pos.x, 0.0))


func v_flip_children():
	for n in node.get_children():
		if not (n is Node2D):
			continue
		
		if n is CollisionShape2D or n is CollisionObject2D:
			n.rotation = -2.0 * n.rotation
		else:
			if flip_h:
				n.scale = Vector2(1, -1)
			else:
				n.scale = Vector2(1, 1)
			
		var pos = n.position
		n.translate(Vector2(0.0, -2.0 * pos.y))

MyKinematic2D.gd

extends KinematicBody2D

const FLIP_HELPERS = preload("res://scripts/flip_helpers.gd")

func _ready()
  flip_helpers = FLIP_HELPERS.new(self)


# Invoking
func do_a_flip_h(do_flip):
		flip_helpers.set_flip_h(do_flip)

func do_a_flip_v(do_flip):
		flip_helpers.set_flip_v(do_flip)