diff options
Diffstat (limited to 'lib/Slic3r/ExtrusionPath.pm')
| -rw-r--r-- | lib/Slic3r/ExtrusionPath.pm | 112 |
1 files changed, 111 insertions, 1 deletions
diff --git a/lib/Slic3r/ExtrusionPath.pm b/lib/Slic3r/ExtrusionPath.pm index dfc5a83f2..67c32807d 100644 --- a/lib/Slic3r/ExtrusionPath.pm +++ b/lib/Slic3r/ExtrusionPath.pm @@ -7,7 +7,11 @@ extends 'Slic3r::Polyline'; # expressed in layers has 'depth_layers' => (is => 'ro', default => sub {1}); -use constant PI => 4 * atan2(1, 1); +use constant X => 0; +use constant Y => 1; + +use Slic3r::Geometry qw(PI epsilon deg2rad rotate_points); +use XXX; sub clip_end { my $self = shift; @@ -70,4 +74,110 @@ sub split_at_acute_angles { return @paths; } +sub detect_arcs { + my $self = shift; + + my $max_angle = deg2rad(40); + my $len_epsilon = 1000000; + + my @points = @{$self->points}; + my @paths = (); + + # we require at least 3 consecutive segments to form an arc + CYCLE: while (@points >= 4) { + for (my $i = 0; $i <= $#points - 3; $i++) { + my $s1 = Slic3r::Line->new($points[$i], $points[$i+1]); + my $s2 = Slic3r::Line->new($points[$i+1], $points[$i+2]); + my $s3 = Slic3r::Line->new($points[$i+2], $points[$i+3]); + my $s1_len = $s1->length; + my $s2_len = $s2->length; + my $s3_len = $s3->length; + + # segments must have the same length + if (abs($s3_len - $s2_len) > $len_epsilon) { + # optimization: skip a cycle + $i++; + next; + } + next if abs($s2_len - $s1_len) > $len_epsilon; + + # segments must have the same relative angle + my $s1_angle = $s1->atan; + my $s2_angle = $s2->atan; + my $s3_angle = $s3->atan; + $s1_angle += 2*PI if $s1_angle < 0; + $s2_angle += 2*PI if $s2_angle < 0; + $s3_angle += 2*PI if $s3_angle < 0; + my $s1s2_angle = $s2_angle - $s1_angle; + my $s2s3_angle = $s3_angle - $s2_angle; + next if abs($s1s2_angle - $s2s3_angle) > $Slic3r::Geometry::parallel_degrees_limit; + next if $s1s2_angle < $Slic3r::Geometry::parallel_degrees_limit; # ignore parallel lines + next if $s1s2_angle > $max_angle; # ignore too sharp vertices + + # s1, s2, s3 form an arc + my $orientation = $s1->point_on_left($points[$i+2]) ? 'ccw' : 'cw'; + + # to find the center, we intersect the perpendicular lines + # passing by midpoints of $s1 and $s3 + my $arc_center; + { + my $s1_mid = $s1->midpoint; + my $s3_mid = $s2->midpoint; + my $rotation_angle = PI/2 * ($orientation eq 'ccw' ? -1 : 1); + my $ray1 = Slic3r::Line->new($s1_mid, rotate_points($rotation_angle, $s1_mid, $points[$i+1])); + my $ray3 = Slic3r::Line->new($s3_mid, rotate_points($rotation_angle, $s3_mid, $points[$i+3])); + $arc_center = $ray1->intersection($ray3, 0); + } + + my $arc = Slic3r::ExtrusionPath::Arc->new( + points => [$points[$i], $points[$i+3]], # first and last points + orientation => $orientation, + center => $arc_center, + radius => $arc_center->distance_to($points[$i]), + ); + + # now look for more points + my $last_line_angle = $s3_angle; + my $last_j = $points[$i+3]; + for (my $j = $i+3; $j < $#points; $j++) { + my $line = Slic3r::Line->new($points[$j], $points[$j+1]); + last if abs($line->length - $s1_len) > $len_epsilon; + my $line_angle = $line->atan; + $line_angle += 2*PI if $line_angle < 0; + my $anglediff = $line_angle - $last_line_angle; + last if abs($s1s2_angle - $anglediff) > $Slic3r::Geometry::parallel_degrees_limit; + + # point $j+1 belongs to the arc + $arc->points->[-1] = $points[$j+1]; + $last_j = $j+1; + + $last_line_angle = $line_angle; + } + + # points 0..$i form a linear path + push @paths, (ref $self)->new( + points => [ @points[0..$i] ], + depth_layers => $self->depth_layers, + ) if $i > 0; + + # add our arc + push @paths, $arc; + print "ARC DETECTED\n"; + # remove arc points from path, leaving one + splice @points, 0, $last_j, (); + + next CYCLE; + } + last; + } + + # remaining points form a linear path + push @paths, (ref $self)->new( + points => [@points], + depth_layers => $self->depth_layers + ) if @points; + + return @paths; +} + 1; |