question: private void weightedMedian ( int iteration , mxGraphHierarchyModel model ) { boolean downwardSweep = ( iteration % 2 == 0 ) ; if ( downwardSweep ) { for ( int j = model . maxRank - 1 ; j >= 0 ; j -- ) { medianRank ( j , downwardSweep ) ; } } else { for ( int j = 1 ; j < model . maxRank ; j ++ ) { medianRank ( j , downwardSweep ) ; } } }
target:  Sweeps up or down the layout attempting to minimise the median placement of connected cells on adjacent ranks