camera zoom place on root node

extends Node2D

# member variables here, example:
# var a=2
# var b="textvar"

func _ready():
	set_process_input(true)
	pass
func _input(event):
	if(event.is_pressed()):
	    if(Input.is_key_pressed(KEY_ESCAPE)):
	        get_tree().quit()

	var zoom = get_node("camera").get_zoom()

	if (event.type == InputEvent.MOUSE_BUTTON):
	    if (event.button_index == BUTTON_WHEEL_UP):
	        print("wheel up (event)")
	        zoom[0] = zoom[0] + 1
	        zoom[1] = zoom[1] + 1
	    if (event.button_index == BUTTON_WHEEL_DOWN):
	        print("wheel down (event)")
	        zoom[0] = zoom[0] - 1
	        zoom[1] = zoom[1] - 1

	get_node("camera").set_zoom(zoom)

	print (zoom)