# p1 is starting or anchor point of the line segment
  foreach my $p1 (@{$points}) {

    # p2 is end point of the line segment
    foreach my $p2 (@{$points}) {

      # We don't need to caculate if anchor and end are the same
      # or we have already seen these two pairs [reversed] before    
      unless ( ($p1 == $p2) || $found->{$p2}->{$p1} ) {

        # Compute the edge
        my $edge = sqrt(
          ($p1->[0] - $p2->[0])**2 +
          ($p1->[1] - $p2->[1])**2
        );

        # Push the whole thing on a stack
        push (@edges, [ $edge, $p1->[0], $p1->[1], $p2->[0], $p2->[1] 
+]);

        # Keep track of the edges we've already computed (no need to d
+o so twice)
        $found->{$p2}->{$p1} = 1;

      }
    }
  }
[download]

# outer loop goes through all points
for my $i ( 0 .. $#{$points}) {

    # inner loop only through those not visited yet
    for my $j ( ( $i + 1 ) .. $#{$points}) {

        # Compute the edge      
        my $edge = sqrt(
            ( $points->[$i][0] - $points->[$j][0] )**2 +
            ( $points->[$i][1] - $points->[$j][1] )**2
        );
        

        # Push the whole thing on a stack
        push (@edges, [
            $edge,
            $points->[$i][0],
            $points->[$i][1],
            $points->[$j][0],
            $points->[$j][1]
            ]
        );            
    }
  }
}
[download]