question: private void layout ( NodeItem p , Rectangle2D r ) { Iterator childIter = p . children ( ) ; while ( childIter . hasNext ( ) ) m_kids . add ( childIter . next ( ) ) ; Collections . sort ( m_kids , s_cmp ) ; double w = Math . min ( r . getWidth ( ) , r . getHeight ( ) ) ; squarify ( m_kids , m_row , w , r ) ; m_kids . clear ( ) ; childIter = p . children ( ) ; while ( childIter . hasNext ( ) ) { NodeItem c = ( NodeItem ) childIter . next ( ) ; if ( c . getChildCount ( ) > 0 && c . getDouble ( AREA ) > 0 ) { updateArea ( c , r ) ; layout ( c , r ) ; } } }
target:  Compute the tree map layout.