165 lines
3.9 KiB
Perl
165 lines
3.9 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_lines polygon_remove_parallel_continuous_edges
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polygon_remove_acute_vertices polygon_segment_having_point point_in_polygon
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PI X1 X2 Y1 Y2);
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use Slic3r::Geometry::Clipper qw(JT_MITER);
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sub lines {
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my $self = shift;
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return polygon_lines($self);
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}
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sub wkt {
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my $self = shift;
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return sprintf "POLYGON((%s))", join ',', map "$_->[0] $_->[1]", @$self;
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}
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sub is_counter_clockwise {
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my $self = shift;
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return Slic3r::Geometry::Clipper::is_counter_clockwise($self);
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}
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sub make_counter_clockwise {
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my $self = shift;
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if (!$self->is_counter_clockwise) {
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$self->reverse;
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return 1;
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}
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return 0;
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}
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sub make_clockwise {
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my $self = shift;
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if ($self->is_counter_clockwise) {
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$self->reverse;
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return 1;
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}
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return 0;
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}
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sub merge_continuous_lines {
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my $self = shift;
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polygon_remove_parallel_continuous_edges($self);
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bless $_, 'Slic3r::Point' for @$self;
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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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bless $_, 'Slic3r::Point' for @$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($point, [$self]);
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}
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sub area {
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my $self = shift;
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return Slic3r::Geometry::Clipper::area($self);
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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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sub simplify {
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my $self = shift;
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return Slic3r::Geometry::Clipper::simplify_polygon( $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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sub split_at_index {
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my $self = shift;
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my ($index) = @_;
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return Slic3r::Polyline->new(
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@$self[$index .. $#$self],
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@$self[0 .. $index],
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);
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}
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sub split_at {
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my $self = shift;
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my ($point) = @_;
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# find index of point
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my $i = -1;
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for (my $n = 0; $n <= $#$self; $n++) {
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if (Slic3r::Geometry::same_point($point, $self->[$n])) {
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$i = $n;
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last;
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}
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}
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die "Point not found" if $i == -1;
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return $self->split_at_index($i);
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}
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sub split_at_first_point {
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my $self = shift;
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return $self->split_at_index(0);
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}
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sub concave_points {
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my $self = shift;
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return map $self->[$_],
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grep Slic3r::Geometry::angle3points(@$self[$_, $_-1, $_+1]) < PI,
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-1 .. ($#$self-1);
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}
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1; |