我有4个latlong点，我想允许用户仅在这些latlng中选择标记。这是4点：
"new_latitude1": 24.790874, "new_longitude1": 46.860488
"new_latitude2": 24.828583, "new_longitude2": 46.842389
"new_latitude3": 24.856611, "new_longitude3": 46.86747
"new_latitude4": 24.837425, "new_longitude4": 46.895313