code: protected void viewLocationDidChange (int dx, int dy)
      {
          // inform our view trackers
          for (int ii = 0, ll = _trackers.size(); ii < ll; ii++) {
              _trackers.get(ii).viewLocationDidChange(dx, dy);
          }
  
          // pass the word on to our sprite/anim managers via the meta manager
          _metamgr.viewLocationDidChange(dx, dy);
      }
docs: Called during our tick when we have adjusted the view location. The {@link #_vbounds} will
  already have been updated to reflect our new view coordinates.
  
  @param dx the delta scrolled in the x direction (in pixels).
  @param dy the delta scrolled in the y direction (in pixels).