public void reset_doors(){
  for (  ExpandRoomObstacle curr_room : expansion_room_arr) {
    if (curr_room == null)     continue;
    curr_room.reset_doors();
  }
}

public void reset_doors ( ) { for ( ExpandRoomObstacle curr_room : expansion_room_arr ) { if ( curr_room == null ) continue ; curr_room . reset_doors ( ) ; } }
resets the expansion rooms for autorouting the next connnection .
