Godot Camera Limits

onready var camera = $player/Camera2D

func _ready():
    set_camera_limits()

func set_camera_limits():
    var map_limits = $TileMap.get_used_rect()
    var map_cellsize = $TileMap.cell_size
    camera.limit_left = map_limits.position.x * map_cellsize.x
    camera.limit_right = map_limits.end.x * map_cellsize.x
    camera.limit_top = map_limits.position.y * map_cellsize.y
    camera.limit_bottom = map_limits.end.y * map_cellsize.y