@Override
  protected int[] doInBackground() throws Exception {
    while (!isCancelled()) {
      Thread.currentThread().sleep(100);
      click = _screen.getLastClickPos();
      x =  (int) (click[0]/Cell.SIZE);
      y =  (int) (click[1]/Cell.SIZE);
      if (click[0] != -1 && click[1] != -1) {
        _move[0 + 2*_s] = x;
        _move[1 + 2*_s] = y;
        firstX = x;
        firstY = y;
        
        _s += 1;
        if (_s == 2) {
          _screen.removeSelector();
          return _move;
        }
        else if (_s == 1) { 
          _screen.addSelector(x, y);
        }
      }
    }
    return null;
  }