question: private void visualizeMTreeEntry ( SVGPlot svgp , Element layer , Projection2D proj , AbstractMTree < ? , N , E , ? > mtree , E entry , int depth ) { DBID roid = entry . getRoutingObjectID ( ) ; if ( roid != null ) { NumberVector ro = rel . get ( roid ) ; double rad = entry . getCoveringRadius ( ) ; final Element r ; if ( dist == Modus . MANHATTAN ) { r = SVGHyperSphere . drawManhattan ( svgp , proj , ro , rad ) ; } else if ( dist == Modus . EUCLIDEAN ) { r = SVGHyperSphere . drawEuclidean ( svgp , proj , ro , rad ) ; } else { r = SVGHyperSphere . drawLp ( svgp , proj , ro , rad , p ) ; } SVGUtil . setCSSClass ( r , INDEX + ( depth - 1 ) ) ; layer . appendChild ( r ) ; } if ( ! entry . isLeafEntry ( ) ) { N node = mtree . getNode ( entry ) ; for ( int i = 0 ; i < node . getNumEntries ( ) ; i ++ ) { E child = node . getEntry ( i ) ; if ( ! child . isLeafEntry ( ) ) { visualizeMTreeEntry ( svgp , layer , proj , mtree , child , depth + 1 ) ; } } } }
target:  Recursively draw the MBR rectangles.