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Refactor shortest_path

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Alessandro Ranellucci 2012-10-30 13:59:33 +01:00
parent 4c6fe0b3d4
commit 37637c34f5
2 changed files with 39 additions and 19 deletions
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35
lib/Slic3r/Polyline.pm
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@ -181,4 +181,39 @@ sub scale {
return $self;
}
package Slic3r::Polyline::Collection;
use Moo;
has 'polylines' => (is => 'ro', default => sub { [] });
# if the second argument is provided, this method will return its items sorted
# instead of returning the actual sorted polylines
sub shortest_path {
my $self = shift;
my ($start_near, $items) = @_;
$items ||= $self->polylines;
my %items_map = map { $self->polylines->[$_] => $items->[$_] } 0 .. $#{$self->polylines};
my @my_paths = @{$self->polylines};
my @paths = ();
my $start_at;
my $endpoints = [ map { $_->[0], $_->[-1] } @my_paths ];
while (@my_paths) {
# find nearest point
my $start_index = $start_near
? Slic3r::Geometry::nearest_point_index($start_near, $endpoints)
: 0;
my $path_index = int($start_index/2);
if ($start_index%2) { # index is end so reverse to make it the start
$my_paths[$path_index]->reverse;
}
push @paths, splice @my_paths, $path_index, 1;
splice @$endpoints, $path_index*2, 2;
$start_near = $paths[-1][-1];
}
return map $items_map{"$_"}, @paths;
}
1;