mirror of https://github.com/vitalif/Slic3r
97 lines
2.8 KiB
Perl
97 lines
2.8 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(
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polygon_segment_having_point
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PI X1 X2 Y1 Y2 epsilon);
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use Slic3r::Geometry::Clipper qw(intersection_pl);
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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 dump_perl {
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my $self = shift;
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return sprintf "[%s]", join ',', map "[$_->[0],$_->[1]]", @$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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# 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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my @points = @$self;
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push @points, $points[0]; # append first point as this is a polygon
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my @new_points = shift @points;
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while (@points) {
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while ($new_points[-1]->distance_to($points[0]) > $max_length) {
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push @new_points, map Slic3r::Point->new(@$_),
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Slic3r::Geometry::point_along_segment($new_points[-1], $points[0], $max_length);
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}
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push @new_points, shift @points;
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}
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pop @new_points; # remove last point as it coincides with first one
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return Slic3r::Polygon->new(@new_points);
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}
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sub concave_points {
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my ($self, $angle) = @_;
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$angle //= PI;
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# input angle threshold is checked on the internal side of the polygon
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# but angle3points measures CCW angle, so we calculate the complementary angle
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my $ccw_angle = 2*PI-$angle;
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my @points = @$self;
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my @points_pp = @{$self->pp};
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my @concave = ();
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for my $i (-1 .. ($#points-1)) {
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next if $points[$i-1]->coincides_with_epsilon($points[$i]) || $points[$i+1]->coincides_with_epsilon($points[$i]);
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# angle is measured in ccw orientation
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my $vertex_angle = Slic3r::Geometry::angle3points(@points_pp[$i, $i-1, $i+1]);
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if ($vertex_angle <= $ccw_angle) {
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push @concave, $points[$i];
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use XXX; YYY ($points[$i]->pp);
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}
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}
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return [@concave];
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}
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sub convex_points {
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my ($self, $angle) = @_;
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$angle //= PI;
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# input angle threshold is checked on the internal side of the polygon
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# but angle3points measures CCW angle, so we calculate the complementary angle
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my $ccw_angle = 2*PI-$angle;
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my @points = @$self;
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my @points_pp = @{$self->pp};
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my @convex = ();
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for my $i (-1 .. ($#points-1)) {
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next if $points[$i-1]->coincides_with_epsilon($points[$i]) || $points[$i+1]->coincides_with_epsilon($points[$i]);
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# angle is measured in ccw orientation
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my $vertex_angle = Slic3r::Geometry::angle3points(@points_pp[$i, $i-1, $i+1]);
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if ($vertex_angle >= $ccw_angle) {
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push @convex, $points[$i];
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}
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}
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return [@convex];
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}
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1; |