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New coverage detection for bridges. Includes implementation of ExPolygon::get_trapezoids()

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This commit is contained in:
Alessandro Ranellucci 2014-04-24 13:43:24 +02:00
parent d458a7c4d2
commit 6201aacf88
21 changed files with 358 additions and 27 deletions
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61
lib/Slic3r/Layer/BridgeDetector.pm
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@ -1,9 +1,9 @@
package Slic3r::Layer::BridgeDetector;
use Moo;
use List::Util qw(first sum max);
use List::Util qw(first sum max min);
use Slic3r::Geometry qw(PI unscale scaled_epsilon rad2deg epsilon);
use Slic3r::Geometry::Clipper qw(intersection_pl intersection_ex);
use Slic3r::Geometry::Clipper qw(intersection_pl intersection_ex union);
has 'expolygon' => (is => 'ro', required => 1);
has 'lower_slices' => (is => 'rw', required => 1); # ExPolygons or ExPolygonCollection
@ -153,4 +153,61 @@ sub detect_angle {
return $self->angle;
}
sub coverage {
my ($self, $angle) = @_;
if (!defined $angle) {
return [] if !defined($angle = $self->detect_angle);
}
# Clone our expolygon and rotate it so that we work with vertical lines.
my $expolygon = $self->expolygon->clone;
$expolygon->rotate(PI/2 - $angle, [0,0]);
# Outset the bridge expolygon by half the amount we used for detecting anchors;
# we'll use this one to generate our trapezoids and be sure that their vertices
# are inside the anchors and not on their contours leading to false negatives.
my $grown = $expolygon->offset_ex(+$self->extrusion_width/2);
# Compute trapezoids according to a vertical orientation
my $trapezoids = [ map @{$_->get_trapezoids(PI/2)}, @$grown ];
# get anchors and rotate them too
my $anchors = [ map $_->clone, @{$self->_anchors} ];
$_->rotate(PI/2 - $angle, [0,0]) for @$anchors;
my @covered = (); # polygons
foreach my $trapezoid (@$trapezoids) {
my @polylines = map $_->as_polyline, @{$trapezoid->lines};
my @supported = @{intersection_pl(\@polylines, [map @$_, @$anchors])};
if (@supported >= 2) {
push @covered, $trapezoid;
}
}
# merge trapezoids and rotate them back
my $coverage = union(\@covered);
$_->rotate(-(PI/2 - $angle), [0,0]) for @$coverage;
# intersect trapezoids with actual bridge area to remove extra margins
$coverage = intersection_ex($coverage, [ @{$self->expolygon} ]);
if (0) {
my @lines = map @{$_->lines}, @$trapezoids;
$_->rotate(-(PI/2 - $angle), [0,0]) for @lines;
require "Slic3r/SVG.pm";
Slic3r::SVG::output(
"coverage_" . rad2deg($angle) . ".svg",
expolygons => [$self->expolygon],
green_expolygons => $self->_anchors,
red_expolygons => $coverage,
lines => \@lines,
);
}
return $coverage;
}
1;