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https://github.com/SoftFever/OrcaSlicer.git
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91 lines
No EOL
3 KiB
Perl
91 lines
No EOL
3 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 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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# 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;
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my @points_pp = @{$self->pp};
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return map $points[$_],
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grep Slic3r::Geometry::angle3points(@points_pp[$_, $_-1, $_+1]) < PI - epsilon,
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-1 .. ($#points-1);
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}
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sub clip_as_polyline {
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my ($self, $polygons) = @_;
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my $self_pl = $self->split_at_first_point;
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# Clipper will remove a polyline segment if first point coincides with last one.
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# Until that bug is not fixed upstream, we move one of those points slightly.
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$self_pl->[0]->translate(1, 0);
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my @polylines = @{intersection_pl([$self_pl], $polygons)};
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if (@polylines == 1) {
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if ($polylines[0][0]->coincides_with($self_pl->[0])) {
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# compensate the above workaround for Clipper bug
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$polylines[0][0]->translate(-1, 0);
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}
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} elsif (@polylines == 2) {
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# If the split_at_first_point() call above happens to split the polygon inside the clipping area
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# we would get two consecutive polylines instead of a single one, so we use this ugly hack to
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# recombine them back into a single one in order to trigger the @edges == 2 logic below.
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# This needs to be replaced with something way better.
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if ($polylines[0][-1]->coincides_with($self_pl->[-1]) && $polylines[-1][0]->coincides_with($self_pl->[0])) {
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my $p = $polylines[0]->clone;
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$p->pop_back;
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$p->append(@{$polylines[-1]});
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return [$p];
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}
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if ($polylines[0][0]->coincides_with($self_pl->[0]) && $polylines[-1][-1]->coincides_with($self_pl->[-1])) {
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my $p = $polylines[-1]->clone;
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$p->pop_back;
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$p->append(@{$polylines[0]});
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return [$p];
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}
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}
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return [ @polylines ];
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}
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1; |