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I guess this would be the hash approach you speak of:
#!/cadappl/bin/perl -w -Ilib use strict; use Data::Dumper; my @r = ( [ 5, 3, 5, 5 ], [ 1, 1, 2, 1 ], [ 2, 1, 2, 3 ], [ 5, 5, 1, 5 ], [ 1, 5, 1, 1 ], [ 2, 3, 5, 3 ] ); my %lineTo; foreach my $ref (@r) { $lineTo{"$$ref[0],$$ref[1]"} = "$$ref[2],$$ref[3]"; } my $start = "1,1"; my $curr = $start; print "$curr\n"; while (($curr = $lineTo{$curr}) ne $start) { print "$curr\n"; }
1,1 2,1 2,3 5,3 5,5 1,5

In reply to Re: reordering segments to form a polygon by Jaap
in thread reordering segments to form a polygon by dada

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