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I am not sure if I add a new approach as I have not studied all posts in this thread in much detail. My code is just a bit shorter and I think a pretty direct approach to the problem.

use strict; use warnings; sub prepare { my( $subtree, $level, $col, $graph ) = @_; my $lcol = 0; if( ref($subtree) ) { $lcol = prepare( $subtree->[0], $level+1, $col, $graph ); # par +se left side of tree, keep top position $lcol and $graph->[$level]->[$_] = '_' for $lcol..$$col-1; # dra +w horizontal line $graph->[$level]->[$$col++] = '/'; $lcol = $$col; # new + root of the tree $graph->[$level]->[$$col++] = '\\'; my $rcol = prepare( $subtree->[1], $level+1, $col, $graph ); # par +se right side of the tree, keep its top position $rcol and $graph->[$level]->[$_] = '_' for $lcol+1..$rcol-1; # dra +w horizontal line } else { $graph->[$level]->[$$col++] = $subtree; # lea +f } return $lcol; # ret +urn column of root } my $root = do { my $r; my @a = ( 'a'..'z', 1..9, 'A'..'Z' ); $r = int( rand $#a ), splice @a, $r, 2, [ @a[ $r, $r+1 ]] while @a + > 1; $a[0]; }; my @graph; my $col = 0; prepare( $root, 0, \$col, \@graph ); for my $row ( @graph ) { print $_ // ' ' for @$row; print "\n"; }

UPDATE: Here is some sample output for a smaller tree:

_____/\_ +_ __________________________/\__ +/\__ ____________________/\________ /\ x + /\ __/\________ _____/\___________ v w + y z __/\ _____/\__ /\__ __/\__ __/\ e /\__ /\__ m /\ _____/\ /\ __/\ d f /\ i /\__ n o /\__ s t u /\ c g h j /\ p /\ a b k l q r

In reply to Re: Challenge: Dumping trees. by hdb
in thread Challenge: Dumping trees. by BrowserUk

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    [ambrus]: So that, or if you really want something agnostic to the loop, then use curl multi. Its interface is quite reasonable (unless you use an old version),
    [ambrus]: though it's very C-like (serious use of varargs so easy to pass the wrong type), and there are some minor problems (busy loop because it doesn't use the same timer as your event loop, so you have to artificially delay timer callbacks by a small amount).

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