103 lines
2.9 KiB
Perl
103 lines
2.9 KiB
Perl
package Slic3r::Polygon;
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use strict;
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use warnings;
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# a polygon is a closed polyline.
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use parent 'Slic3r::Polyline';
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use Slic3r::Geometry qw(polygon_remove_parallel_continuous_edges
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polygon_remove_acute_vertices polygon_segment_having_point
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PI X1 X2 Y1 Y2 epsilon);
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sub wkt {
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my $self = shift;
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return sprintf "POLYGON((%s))", join ',', map "$_->[0] $_->[1]", @$self;
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}
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sub merge_continuous_lines {
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my $self = shift;
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my $p = $self->pp;
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polygon_remove_parallel_continuous_edges($p);
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return (ref $self)->new(@$p);
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}
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sub remove_acute_vertices {
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my $self = shift;
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polygon_remove_acute_vertices($self);
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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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sub grow {
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my $self = shift;
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return $self->split_at_first_point->grow(@_);
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}
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# NOTE that this will turn the polygon to ccw regardless of its
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# original orientation
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sub simplify {
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my $self = shift;
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return @{Slic3r::Geometry::Clipper::simplify_polygons([ $self->SUPER::simplify(@_) ])};
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}
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# this method subdivides the polygon segments to that no one of them
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# is longer than the length provided
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sub subdivide {
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my $self = shift;
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my ($max_length) = @_;
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for (my $i = 0; $i <= $#$self; $i++) {
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my $len = Slic3r::Geometry::line_length([ $self->[$i-1], $self->[$i] ]);
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my $num_points = int($len / $max_length) - 1;
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$num_points++ if $len % $max_length;
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# $num_points is the number of points to add between $i-1 and $i
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next if $num_points == -1;
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my $spacing = $len / ($num_points + 1);
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my @new_points = map Slic3r::Point->new($_),
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map Slic3r::Geometry::point_along_segment($self->[$i-1], $self->[$i], $spacing * $_),
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1..$num_points;
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splice @$self, $i, 0, @new_points;
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$i += @new_points;
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}
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}
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# returns false if the polygon 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 polyline is not printable.
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# we use flow_width here because this has to be consistent
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# with the thin wall detection in Layer->make_surfaces,
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# otherwise we could lose surfaces as that logic wouldn't
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# detect them and we would be discarding them.
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my $p = $self->clone;
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$p->make_counter_clockwise;
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return @{Slic3r::Geometry::Clipper::offset([$p], -$width / 2)} ? 1 : 0;
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}
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sub is_valid {
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my $self = shift;
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return @$self >= 3;
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}
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# for cw polygons this will return convex points!
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sub concave_points {
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my $self = shift;
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my @points = @{$self->pp};
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return map $self->[$_],
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grep Slic3r::Geometry::angle3points(@points[$_, $_-1, $_+1]) < PI - epsilon,
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-1 .. ($#points-1);
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}
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1; |