Tiled post import script

import.gd

tool
extends Reference

const MARGIN = 10

func post_import(scene):
#	scene = scene.duplicate()
	# create nav poly
	var nav = NavigationPolygonInstance.new()
	var nav_poly = NavigationPolygon.new()
	
	# get all tile layers in scene
	var tilemaps = get_tilemaps(scene)
	
	for y in range(tilemaps[0].get_used_rect().size.y):
		for x in range(tilemaps[0].get_used_rect().size.x):
			var outlines = []
			for tmap in tilemaps:
				var set = tmap.get_tileset()
				var id = tmap.get_cell(x,y)
				var n = set.tile_get_navigation_polygon(id)
				if n != null:
					for o_idx in range(n.get_outline_count()):
						var res = n.get_outline(o_idx)
						if not outlines.has(res):
							for el_idx in range(res.size()):
								res[el_idx] = (res[el_idx] + (Vector2(x,y)\
								* tmap.get_cell_size()) + set.tile_get_navigation_polygon_offset(id)).snapped(Vector2(1,1))
							outlines.append(res)
			for i in range(outlines.size()):
				nav_poly.add_outline_at_index(outlines[i], i)
				printerr(outlines[i])
	
	nav_poly.make_polygons_from_outlines()
	# insert navigation into scene
	nav.set_navigation_polygon(nav_poly) 
	nav.set_name("nav")
	scene.add_child(nav)
	nav.set_owner(scene)
	
	return scene

func get_tilemaps(scene):
	var tilemaps = []
	for node in scene.get_children():
		if node extends TileMap:
			tilemaps.append(node)
	return tilemaps
	
func get_poly_from_rect(rect):
	return Vector2Array(\
	[Vector2(-MARGIN, -MARGIN),
	Vector2(rect.end.x + MARGIN, -MARGIN),
	Vector2(rect.end.x + MARGIN, rect.end.y + MARGIN),
	Vector2(-MARGIN, rect.end.y + MARGIN)])