mirror of https://github.com/vitalif/Slic3r
265 lines
7.7 KiB
Perl
265 lines
7.7 KiB
Perl
package Slic3r::ExPolygon;
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use strict;
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use warnings;
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# an ExPolygon is a polygon with holes
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use Boost::Geometry::Utils;
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use List::Util qw(first);
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use Math::Geometry::Voronoi;
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use Slic3r::Geometry qw(X Y A B point_in_polygon same_line epsilon);
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use Slic3r::Geometry::Clipper qw(union_ex JT_MITER);
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sub contour {
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my $self = shift;
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return $self->[0];
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}
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sub holes {
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my $self = shift;
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return @$self[1..$#$self];
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}
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sub is_valid {
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my $self = shift;
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return (!first { !$_->is_valid } @$self)
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&& $self->contour->is_counter_clockwise
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&& (!first { $_->is_counter_clockwise } $self->holes);
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}
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# returns false if the expolygon is too tight to be printed
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sub is_printable {
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my $self = shift;
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my ($width) = @_;
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# try to get an inwards offset
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# for a distance equal to half of the extrusion width;
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# if no offset is possible, then expolygon is not printable.
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return Slic3r::Geometry::Clipper::offset($self, -$width / 2) ? 1 : 0;
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}
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sub wkt {
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my $self = shift;
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return sprintf "POLYGON(%s)",
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join ',', map "($_)", map { join ',', map "$_->[0] $_->[1]", @$_ } @$self;
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}
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sub offset {
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my $self = shift;
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return Slic3r::Geometry::Clipper::offset($self, @_);
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}
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sub offset_ex {
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my $self = shift;
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return Slic3r::Geometry::Clipper::offset_ex(\@$self, @_);
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}
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sub safety_offset {
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my $self = shift;
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return Slic3r::Geometry::Clipper::safety_offset_ex(\@$self, @_);
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}
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sub noncollapsing_offset_ex {
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my $self = shift;
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my ($distance, @params) = @_;
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return $self->offset_ex($distance + 1, @params);
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}
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sub encloses_point {
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my $self = shift;
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my ($point) = @_;
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return Boost::Geometry::Utils::point_covered_by_polygon($point->pp, $self->pp);
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}
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# A version of encloses_point for use when hole borders do not matter.
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# Useful because point_on_segment is probably slower (this was true
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# before the switch to Boost.Geometry, not sure about now)
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sub encloses_point_quick {
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my $self = shift;
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my ($point) = @_;
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return Boost::Geometry::Utils::point_within_polygon($point->pp, $self->pp);
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}
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sub encloses_line {
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my $self = shift;
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my ($line, $tolerance) = @_;
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my $clip = $self->clip_line($line);
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if (!defined $tolerance) {
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# optimization
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return @$clip == 1 && same_line($clip->[0]->pp, $line->pp);
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} else {
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return @$clip == 1 && abs(Boost::Geometry::Utils::linestring_length($clip->[0]->pp) - $line->length) < $tolerance;
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}
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}
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sub bounding_box {
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my $self = shift;
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return $self->contour->bounding_box;
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}
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sub clip_line {
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my $self = shift;
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my ($line) = @_; # line must be a Slic3r::Line object
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return [
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map Slic3r::Line->new(@$_),
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@{Boost::Geometry::Utils::polygon_multi_linestring_intersection($self->pp, [$line->pp])}
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];
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}
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sub simplify {
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my $self = shift;
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my ($tolerance) = @_;
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# it would be nice to have a multilinestring_simplify method in B::G::U
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my @simplified = Slic3r::Geometry::Clipper::simplify_polygons(
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[ map Boost::Geometry::Utils::linestring_simplify($_, $tolerance), @{$self->pp} ],
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);
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return @{ Slic3r::Geometry::Clipper::union_ex([ @simplified ]) };
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}
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sub area {
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my $self = shift;
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my $area = $self->contour->area;
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$area -= $_->area for $self->holes;
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return $area;
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}
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# this method only works for expolygons having only a contour or
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# a contour and a hole, and not being thicker than the supplied
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# width. it returns a polyline or a polygon
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sub medial_axis {
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my $self = shift;
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my ($width) = @_;
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my @self_lines = map $_->lines, @$self;
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my $expolygon = $self->clone;
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my @points = ();
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foreach my $polygon (@$expolygon) {
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Slic3r::Geometry::polyline_remove_short_segments($polygon, $width / 2);
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# subdivide polygon segments so that we don't have anyone of them
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# being longer than $width / 2
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$polygon->subdivide($width/2);
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push @points, @$polygon;
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}
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my $voronoi = Math::Geometry::Voronoi->new(points => \@points);
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$voronoi->compute;
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my @skeleton_lines = ();
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my $vertices = $voronoi->vertices;
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my $edges = $voronoi->edges;
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foreach my $edge (@$edges) {
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# ignore lines going to infinite
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next if $edge->[1] == -1 || $edge->[2] == -1;
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my ($a, $b);
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$a = $vertices->[$edge->[1]];
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$b = $vertices->[$edge->[2]];
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next if !$self->encloses_point_quick($a) || !$self->encloses_point_quick($b);
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push @skeleton_lines, [$edge->[1], $edge->[2]];
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}
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# remove leafs (lines not connected to other lines at one of their endpoints)
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{
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my %pointmap = ();
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$pointmap{$_}++ for map @$_, @skeleton_lines;
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@skeleton_lines = grep {
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$pointmap{$_->[A]} >= 2 && $pointmap{$_->[B]} >= 2
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} @skeleton_lines;
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}
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return () if !@skeleton_lines;
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# now walk along the medial axis and build continuos polylines or polygons
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my @polylines = ();
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{
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# build a map of line endpoints
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my %pointmap = (); # point_idx => [line_idx, line_idx ...]
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for my $line_idx (0 .. $#skeleton_lines) {
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for my $point_idx (@{$skeleton_lines[$line_idx]}) {
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$pointmap{$point_idx} ||= [];
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push @{$pointmap{$point_idx}}, $line_idx;
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}
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}
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# build the list of available lines
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my %spare_lines = map {$_ => 1} (0 .. $#skeleton_lines);
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CYCLE: while (%spare_lines) {
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push @polylines, [];
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my $polyline = $polylines[-1];
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# start from a random line
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my $first_line_idx = +(keys %spare_lines)[0];
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delete $spare_lines{$first_line_idx};
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push @$polyline, @{ $skeleton_lines[$first_line_idx] };
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while (1) {
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my $last_point_id = $polyline->[-1];
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my $lines_starting_here = $pointmap{$last_point_id};
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# remove all the visited lines from the array
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shift @$lines_starting_here
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while @$lines_starting_here && !$spare_lines{$lines_starting_here->[0]};
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# do we have a line starting here?
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my $next_line_idx = shift @$lines_starting_here;
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if (!defined $next_line_idx) {
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delete $pointmap{$last_point_id};
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next CYCLE;
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}
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# line is not available anymore
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delete $spare_lines{$next_line_idx};
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# add the other point to our polyline and continue walking
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push @$polyline, grep $_ ne $last_point_id, @{$skeleton_lines[$next_line_idx]};
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}
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}
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}
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my @result = ();
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foreach my $polyline (@polylines) {
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next unless @$polyline >= 2;
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# now replace point indexes with coordinates
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@$polyline = map $vertices->[$_], @$polyline;
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# cleanup
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$polyline = Slic3r::Geometry::douglas_peucker($polyline, $width / 7);
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if (Slic3r::Geometry::same_point($polyline->[0], $polyline->[-1])) {
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next if @$polyline == 2;
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push @result, Slic3r::Polygon->new(@$polyline[0..$#$polyline-1]);
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} else {
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push @result, Slic3r::Polyline->new(@$polyline);
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}
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}
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return @result;
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}
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package Slic3r::ExPolygon::Collection;
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use Slic3r::Geometry qw(X1 Y1);
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sub align_to_origin {
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my $self = shift;
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my @bb = Slic3r::Geometry::bounding_box([ map @$_, map @$_, @$self ]);
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$self->translate(-$bb[X1], -$bb[Y1]);
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$self;
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}
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sub size {
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my $self = shift;
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return [ Slic3r::Geometry::size_2D([ map @$_, map @$_, @$self ]) ];
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}
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1;
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