432 lines
16 KiB
Perl
432 lines
16 KiB
Perl
package Slic3r::Layer;
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use Moo;
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use Math::Clipper ':all';
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use Math::ConvexHull qw(convex_hull);
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use Slic3r::Geometry qw(polygon_lines points_coincide angle3points polyline_lines nearest_point
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line_length);
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use Slic3r::Geometry::Clipper qw(union_ex);
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use XXX;
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use constant PI => 4 * atan2(1, 1);
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use constant A => 0;
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use constant B => 1;
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# a sequential number of layer, starting at 0
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has 'id' => (
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is => 'ro',
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#isa => 'Int',
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required => 1,
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);
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# collection of spare segments generated by slicing the original geometry;
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# these need to be merged in continuos (closed) polylines
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has 'lines' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Line]',
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default => sub { [] },
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);
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# collection of surfaces generated by slicing the original geometry
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has 'surfaces' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Surface]',
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default => sub { [] },
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);
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# collection of surfaces representing bridges
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has 'bridges' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Surface::Bridge]',
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default => sub { [] },
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);
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# collection of surfaces to make perimeters for
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has 'perimeter_surfaces' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Surface]',
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default => sub { [] },
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);
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# ordered collection of extrusion paths to build all perimeters
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has 'perimeters' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::ExtrusionLoop]',
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default => sub { [] },
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);
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# ordered collection of extrusion paths to build skirt loops
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has 'skirts' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::ExtrusionLoop]',
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default => sub { [] },
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);
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# collection of surfaces generated by offsetting the innermost perimeter(s)
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# they represent boundaries of areas to fill
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has 'fill_surfaces' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::Surface::Collection]',
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default => sub { [] },
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);
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# ordered collection of extrusion paths to fill surfaces
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has 'fills' => (
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is => 'rw',
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#isa => 'ArrayRef[Slic3r::ExtrusionPath]',
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default => sub { [] },
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);
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sub z {
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my $self = shift;
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return ($self->id * $Slic3r::layer_height + $Slic3r::layer_height/2) / $Slic3r::resolution;
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}
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sub add_surface {
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my $self = shift;
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my (@vertices) = @_;
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# convert arrayref points to Point objects
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@vertices = map Slic3r::Point->cast($_), @vertices;
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my $surface = Slic3r::Surface->new(
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contour => Slic3r::Polyline::Closed->new(points => \@vertices),
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);
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push @{ $self->surfaces }, $surface;
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# make sure our contour has its points in counter-clockwise order
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$surface->contour->make_counter_clockwise;
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return $surface;
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}
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sub add_line {
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my $self = shift;
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my ($line) = @_;
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$line = Slic3r::Line->cast($line);
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return if $line->a->coincides_with($line->b);
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push @{ $self->lines }, $line;
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return $line;
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}
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sub remove_line {
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my $self = shift;
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my ($line) = @_;
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@{ $self->lines } = grep $_ ne $line, @{ $self->lines };
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}
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sub remove_surface {
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my $self = shift;
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my ($surface) = @_;
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@{ $self->surfaces } = grep $_ ne $surface, @{ $self->surfaces };
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}
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# build polylines from lines
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sub make_surfaces {
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my $self = shift;
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# this algorithm can be further simplified:
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# first remove all facetedges that are not connected to any other edge
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# or that are connected to more than one edge: those are the edges
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# tangent to our plane, that we don't care about;
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# then we would have all points connecting two and only two lines,
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# so a simple head-to-tail algorithm would work
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my @lines = ();
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push @lines, map $_->p, @{$self->lines};
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#@lines = grep line_length($_) > xx, @lines;
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#use Slic3r::SVG;
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#Slic3r::SVG::output(undef, "lines.svg",
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# lines => [ map $_->p, grep !$_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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# red_lines => [ map $_->p, grep $_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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#);
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my $get_point_id = sub { sprintf "%.0f,%.0f", @{$_[0]} };
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my (%pointmap, @pointmap_keys) = ();
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foreach my $line (@lines) {
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my $point_id = $get_point_id->($line->[A]);
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if (!exists $pointmap{$point_id}) {
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$pointmap{$point_id} = [];
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push @pointmap_keys, $line->[A];
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}
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push @{ $pointmap{$point_id} }, $line;
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}
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my $n = 0;
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my @polylines = ();
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while (my $first_line = shift @lines) {
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my @points = @$first_line;
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my %seen_points = map { $get_point_id->($points[$_]) => $_ } 0..1;
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CYCLE: while (1) {
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my $next_lines = $pointmap{ $get_point_id->($points[-1]) };
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# shouldn't we find the point, let's try with a slower algorithm
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# as approximation may make the coordinates differ
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if (!$next_lines) {
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my $nearest_point = nearest_point($points[-1], \@pointmap_keys);
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#printf " we have a nearest point: %f,%f (%s)\n", @$nearest_point, $get_point_id->($nearest_point);
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if ($nearest_point) {
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local $Slic3r::Geometry::epsilon = 1000000;
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$next_lines = $pointmap{$get_point_id->($nearest_point)}
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if points_coincide($points[-1], $nearest_point);
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}
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}
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#Slic3r::SVG::output(undef, "lines.svg",
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# lines => [ map $_->p, grep !$_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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# red_lines => [ map $_->p, grep $_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
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# points => [ $points[-1] ],
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# no_arrows => 1,
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#) if !$next_lines;
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$next_lines
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or die sprintf("No lines start at point %s. This shouldn't happen", $get_point_id->($points[-1]));
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last CYCLE if !@$next_lines;
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my @ordered_next_lines = sort
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{ angle3points($points[-1], $points[-2], $next_lines->[$a][B]) <=> angle3points($points[-1], $points[-2], $next_lines->[$b][B]) }
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0..$#$next_lines;
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#if (@$next_lines > 1) {
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# Slic3r::SVG::output(undef, "next_line.svg",
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# lines => $next_lines,
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# red_lines => [ polyline_lines([@points]) ],
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# green_lines => [ $next_lines->[ $ordered_next_lines[0] ] ],
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# );
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#}
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my ($next_line) = splice @$next_lines, $ordered_next_lines[0], 1;
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push @points, $next_line->[B];
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my $point_id = $get_point_id->($points[-1]);
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if ($seen_points{$point_id}) {
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splice @points, 0, $seen_points{$point_id};
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last CYCLE;
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}
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$seen_points{$point_id} = $#points;
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}
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if (@points < 4 || !points_coincide($points[0], $points[-1])) {
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next;
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}
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pop @points;
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Slic3r::debugf "Discovered polyline of %d points\n", scalar(@points);
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push @polylines, [@points];
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}
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{
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my $expolygons = union_ex([ @polylines ]);
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Slic3r::debugf " %d surface(s) detected from %d polylines\n",
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scalar(@$expolygons), scalar(@polylines);
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push @{$self->surfaces}, map Slic3r::Surface->cast_from_expolygon($_, surface_type => 'internal'), @$expolygons;
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}
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#use Slic3r::SVG;
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#Slic3r::SVG::output(undef, "surfaces.svg",
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# polygons => [ map $_->contour->p, @{$self->surfaces} ],
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# red_polygons => [ map $_->p, map @{$_->holes}, @{$self->surfaces} ],
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#);
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}
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sub remove_small_surfaces {
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my $self = shift;
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my @good_surfaces = ();
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my $surface_count = scalar @{$self->surfaces};
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foreach my $surface (@{$self->surfaces}) {
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next if !$surface->contour->is_printable;
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@{$surface->holes} = grep $_->is_printable, @{$surface->holes};
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push @good_surfaces, $surface;
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}
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@{$self->surfaces} = @good_surfaces;
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Slic3r::debugf "removed %d small surfaces at layer %d\n",
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($surface_count - @good_surfaces), $self->id
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if @good_surfaces != $surface_count;
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}
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sub remove_small_perimeters {
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my $self = shift;
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my @good_perimeters = grep $_->is_printable, @{$self->perimeters};
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Slic3r::debugf "removed %d unprintable perimeters at layer %d\n",
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(@{$self->perimeters} - @good_perimeters), $self->id
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if @good_perimeters != @{$self->perimeters};
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@{$self->perimeters} = @good_perimeters;
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}
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# make bridges printable
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sub process_bridges {
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my $self = shift;
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return if $self->id == 0;
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# a bottom surface on a layer > 0 is either a bridge or a overhang
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# or a combination of both
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my @bottom_surfaces = grep $_->surface_type eq 'bottom', @{$self->surfaces} or return;
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my @supporting_surfaces = grep $_->surface_type =~ /internal/, @{$self->surfaces};
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SURFACE: foreach my $surface (@bottom_surfaces) {
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# since we can't print concave bridges, we transform the surface
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# in a convex polygon; this will print thin membranes eventually
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my $surface_p = convex_hull($surface->contour->p);
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#use Slic3r::SVG;
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#Slic3r::SVG::output(undef, "bridge.svg",
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# green_polygons => [ map $_->p, @supporting_surfaces ],
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# red_polygons => [ $surface_p ],
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#);
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# find all supported edges (as polylines, thus keeping notion of
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# consecutive supported edges)
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my @supported_polylines = ();
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{
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my @current_polyline = ();
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EDGE: foreach my $edge (Slic3r::Geometry::polygon_lines($surface_p)) {
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for my $supporting_surface (@supporting_surfaces) {
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local $Slic3r::Geometry::epsilon = 1E+7;
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if (Slic3r::Geometry::polygon_has_subsegment($supporting_surface->contour->p, $edge)) {
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push @current_polyline, $edge;
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next EDGE;
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}
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}
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if (@current_polyline) {
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push @supported_polylines, [@current_polyline];
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@current_polyline = ();
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}
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}
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push @supported_polylines, [@current_polyline] if @current_polyline;
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}
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# defensive programming, this shouldn't happen
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if (@supported_polylines == 0) {
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Slic3r::debugf "Found bridge/overhang with no supports on layer %d; ignoring\n", $self->id;
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next SURFACE;
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}
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if (@supported_polylines == 1) {
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Slic3r::debugf "Found bridge/overhang with only one support on layer %d; ignoring\n", $self->id;
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next SURFACE;
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}
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# now connect the first point to the last of each polyline
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@supported_polylines = map [ $_->[0]->[0], $_->[-1]->[-1] ], @supported_polylines;
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# @supported_polylines becomes actually an array of lines
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# if we got more than two supports, get the longest two
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if (@supported_polylines > 2) {
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my %lengths = map { $_ => Slic3r::Geometry::line_length($_) } @supported_polylines;
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@supported_polylines = sort { $lengths{"$a"} <=> $lengths{"$b"} } @supported_polylines;
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@supported_polylines = @supported_polylines[-2,-1];
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}
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# connect the midpoints, that will give the the optimal infill direction
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my @midpoints = map Slic3r::Geometry::midpoint($_), @supported_polylines;
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my $bridge_angle = -Slic3r::Geometry::rad2deg(Slic3r::Geometry::line_atan(\@midpoints) + PI/2);
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Slic3r::debugf "Optimal infill angle of bridge on layer %d is %d degrees\n", $self->id, $bridge_angle;
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# detect which neighbor surfaces are now supporting our bridge
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my @supporting_neighbor_surfaces = ();
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foreach my $supporting_surface (@supporting_surfaces) {
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local $Slic3r::Geometry::epsilon = 1E+7;
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push @supporting_neighbor_surfaces, $supporting_surface
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if grep Slic3r::Geometry::polygon_has_vertex($supporting_surface->contour->p, $_),
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map $_->[0], @supported_polylines;
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}
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# defensive programming, this shouldn't happen
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if (@supporting_neighbor_surfaces == 0) {
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Slic3r::debugf "Couldn't find supporting surfaces on layer %d; ignoring\n", $self->id;
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next SURFACE;
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}
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# now, extend our bridge by taking a portion of supporting surfaces
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{
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# offset the bridge by the specified amount of mm
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my $bridge_offset = ${ offset([$surface_p], $Slic3r::bridge_overlap / $Slic3r::resolution, $Slic3r::resolution * 100, JT_MITER, 2) }[0];
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# calculate the new bridge
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my $clipper = Math::Clipper->new;
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$clipper->add_subject_polygon($surface_p);
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$clipper->add_subject_polygons([ map $_->p, @supporting_neighbor_surfaces ]);
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$clipper->add_clip_polygon($bridge_offset);
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my $intersection = $clipper->execute(CT_INTERSECTION, PFT_NONZERO, PFT_NONZERO);
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push @{$self->bridges}, map Slic3r::Surface::Bridge->cast_from_polygon($_,
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surface_type => 'bottom',
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bridge_angle => $bridge_angle,
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), @$intersection;
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}
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}
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}
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# generates a set of surfaces that will be used to make perimeters
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# thus, we need to merge internal surfaces and bridges
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sub detect_perimeter_surfaces {
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my $self = shift;
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# little optimization: skip the Clipper UNION if we have no bridges
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if (!@{$self->bridges}) {
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push @{$self->perimeter_surfaces}, @{$self->surfaces};
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} else {
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my $clipper = Math::Clipper->new;
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$clipper->add_subject_polygons([ map $_->p, grep $_->surface_type =~ /internal/, @{$self->surfaces} ]);
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$clipper->add_clip_polygons([ map $_->p, @{$self->bridges} ]);
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my $union = $clipper->ex_execute(CT_UNION, PFT_NONZERO, PFT_NONZERO);
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push @{$self->perimeter_surfaces},
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map Slic3r::Surface->cast_from_expolygon($_, surface_type => 'internal'),
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@$union;
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push @{$self->perimeter_surfaces},
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grep $_->surface_type !~ /internal/ && ($_->surface_type ne 'bottom' || $self->id == 0),
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@{$self->surfaces};
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}
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}
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# splits fill_surfaces in internal and bridge surfaces
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sub split_bridges_fills {
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my $self = shift;
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my $clipper = Math::Clipper->new;
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foreach my $surf_coll (@{$self->fill_surfaces}) {
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my @surfaces = @{$surf_coll->surfaces};
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@{$surf_coll->surfaces} = ();
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# intersect fill_surfaces with bridges to get actual bridges
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foreach my $bridge (@{$self->bridges}) {
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$clipper->clear;
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$clipper->add_subject_polygons([ map $_->p, @surfaces ]);
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$clipper->add_clip_polygon($bridge->contour->p);
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my $intersection = $clipper->ex_execute(CT_INTERSECTION, PFT_NONZERO, PFT_NONZERO);
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push @{$surf_coll->surfaces}, map Slic3r::Surface::Bridge->cast_from_expolygon($_,
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surface_type => 'bottom',
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bridge_angle => $bridge->bridge_angle,
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), @$intersection;
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}
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# difference between fill_surfaces and bridges are the other surfaces
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foreach my $surface (@surfaces) {
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$clipper->clear;
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$clipper->add_subject_polygons([ $surface->p ]);
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$clipper->add_clip_polygons([ map $_->contour->p, @{$self->bridges} ]);
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my $difference = $clipper->ex_execute(CT_DIFFERENCE, PFT_NONZERO, PFT_NONZERO);
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push @{$surf_coll->surfaces}, map Slic3r::Surface->cast_from_expolygon($_,
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surface_type => $surface->surface_type), @$difference;
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}
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}
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}
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1;
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