59 lines
2.1 KiB
Perl
59 lines
2.1 KiB
Perl
package Slic3r::Fill::Concentric;
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use Moo;
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extends 'Slic3r::Fill::Base';
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use Slic3r::Geometry qw(scale unscale X nearest_point_index);
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use Slic3r::Geometry::Clipper qw(offset offset2 union_pt traverse_pt PFT_EVENODD);
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sub fill_surface {
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my $self = shift;
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my ($surface, %params) = @_;
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# no rotation is supported for this infill pattern
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my $expolygon = $surface->expolygon;
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my $bounding_box = $expolygon->bounding_box;
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my $min_spacing = scale $params{flow_spacing};
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my $distance = $min_spacing / $params{density};
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my $flow_spacing = $params{flow_spacing};
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if ($params{density} == 1 && !$params{dont_adjust}) {
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$distance = $self->adjust_solid_spacing(
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width => $bounding_box->size->[X],
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distance => $distance,
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);
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$flow_spacing = unscale $distance;
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}
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# compensate the overlap which is good for rectilinear but harmful for concentric
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# where the perimeter/infill spacing should be equal to any other loop spacing
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my @loops = my @last = @{offset($expolygon, -&Slic3r::INFILL_OVERLAP_OVER_SPACING * $min_spacing / 2)};
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while (@last) {
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push @loops, @last = @{offset2(\@last, -1.5*$distance, +0.5*$distance)};
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}
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# generate paths from the outermost to the innermost, to avoid
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# adhesion problems of the first central tiny loops
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@loops = map Slic3r::Polygon->new(@$_),
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reverse traverse_pt( union_pt(\@loops, PFT_EVENODD) );
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# order paths using a nearest neighbor search
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my @paths = ();
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my $last_pos = [0,0];
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foreach my $loop (@loops) {
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push @paths, $loop->split_at_index(nearest_point_index($last_pos, $loop));
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$last_pos = $paths[-1][-1];
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}
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# clip the paths to avoid the extruder to get exactly on the first point of the loop
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my $clip_length = scale $flow_spacing * &Slic3r::LOOP_CLIPPING_LENGTH_OVER_SPACING;
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$_->clip_end($clip_length) for @paths;
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# TODO: return ExtrusionLoop objects to get better chained paths
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return { flow_spacing => $flow_spacing, no_sort => 1 }, @paths;
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}
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1;
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