question: protected static void isort ( int level [ ] , float BC [ ] ) { float temp ; int temp2 ; for ( int i = 0 ; i < BC . length - 1 ; i ++ ) { int j = i ; temp = BC [ j + 1 ] ; temp2 = level [ j + 1 ] ; if ( temp == 0 ) { continue ; } int prej = j + 1 ; while ( j > - 1 && ( temp < BC [ j ] || BC [ j ] == 0 ) ) { if ( BC [ j ] == 0 ) { j -- ; continue ; } else { BC [ prej ] = BC [ j ] ; level [ prej ] = level [ j ] ; prej = j ; j -- ; } } BC [ prej ] = temp ; level [ prej ] = temp2 ; } }
target:  This methods sorts the vertices in level[] according to their barycenters in BC[], using insertion sort. It, however, doesn't touch the vertices with barycenter equal to zero.