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Move arc fitting code to its own post-processing filter and remove the built-in ExtrusionPath::Arc class

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This commit is contained in:
Alessandro Ranellucci 2013-08-28 19:50:16 +02:00
parent 055273fbc8
commit 5f17fa342b
9 changed files with 149 additions and 196 deletions
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2
lib/Slic3r.pm
View file

@ -42,7 +42,6 @@ use Slic3r::ExPolygon;
use Slic3r::Extruder;
use Slic3r::ExtrusionLoop;
use Slic3r::ExtrusionPath;
use Slic3r::ExtrusionPath::Arc;
use Slic3r::ExtrusionPath::Collection;
use Slic3r::Fill;
use Slic3r::Flow;
@ -50,6 +49,7 @@ use Slic3r::Format::AMF;
use Slic3r::Format::OBJ;
use Slic3r::Format::STL;
use Slic3r::GCode;
use Slic3r::GCode::ArcFitting;
use Slic3r::GCode::CoolingBuffer;
use Slic3r::GCode::Layer;
use Slic3r::GCode::MotionPlanner;

112
lib/Slic3r/ExtrusionPath.pm
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@ -126,116 +126,4 @@ sub split_at_acute_angles {
return @paths;
}
sub detect_arcs {
my $self = shift;
my ($max_angle, $len_epsilon) = @_;
$max_angle = deg2rad($max_angle || 15);
$len_epsilon ||= 10 / &Slic3r::SCALING_FACTOR;
my $parallel_degrees_limit = abs(Slic3r::Geometry::deg2rad(3));
my @points = @{$self->points};
my @paths = ();
# we require at least 3 consecutive segments to form an arc
CYCLE: while (@points >= 4) {
POINT: 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) > $parallel_degrees_limit;
next if abs($s1s2_angle) < $parallel_degrees_limit; # ignore parallel lines
next if $s1s2_angle > $max_angle; # ignore too sharp vertices
my @arc_points = ($points[$i], $points[$i+3]), # first and last points
# now look for more points
my $last_line_angle = $s3_angle;
my $last_j = $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) > $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;
}
# 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 last segment
# a better method would be to draw all the perpendicular lines
# and find the centroid of the enclosed polygon, or to
# intersect multiple lines and find the centroid of the convex hull
# around the intersections
my $arc_center;
{
my $s1_mid = $s1->midpoint;
my $last_mid = Slic3r::Line->new($points[$last_j-1], $points[$last_j])->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 $last_ray = Slic3r::Line->new($last_mid, rotate_points($rotation_angle, $last_mid, $points[$last_j]));
$arc_center = $ray1->intersection($last_ray, 0) // next POINT;
}
my $arc = Slic3r::ExtrusionPath::Arc->new(
polyline => Slic3r::Polyline->new(@arc_points),
role => $self->role,
flow_spacing => $self->flow_spacing,
orientation => $orientation,
center => $arc_center,
radius => $arc_center->distance_to($points[$i]),
);
# points 0..$i form a linear path
push @paths, $self->clone(polyline => Slic3r::Polyline->new(@points[0..$i]))
if $i > 0;
# add our arc
push @paths, $arc;
Slic3r::debugf "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, $self->clone(polyline => Slic3r::Polyline->new(@points))
if @points > 1;
return @paths;
}
1;

34
lib/Slic3r/ExtrusionPath/Arc.pm
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@ -1,34 +0,0 @@
package Slic3r::ExtrusionPath::Arc;
use Moo;
has 'polyline' => (is => 'rw', required => 1);
has 'role' => (is => 'rw', required => 1);
has 'height' => (is => 'rw');
has 'flow_spacing' => (is => 'rw');
has 'center' => (is => 'ro', required => 1);
has 'radius' => (is => 'ro', required => 1);
has 'orientation' => (is => 'ro', required => 1); # cw/ccw
use Slic3r::Geometry qw(PI angle3points);
sub points {
my $self = shift;
return $self->polyline;
}
sub angle {
my $self = shift;
return angle3points($self->center, @{$self->points});
}
sub length {
my $self = shift;
if($self->orientation eq 'ccw') {
return $self->radius * $self->angle;
} else {
return $self->radius * (2*PI() - $self->angle);
}
}
1;

6
lib/Slic3r/ExtrusionPath/Collection.pm
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@ -47,10 +47,4 @@ sub cleanup {
$self->append(@paths);
}
sub detect_arcs {
my $self = shift;
return map $_->detect_arcs(@_), @$self;
}
1;

43
lib/Slic3r/GCode.pm
View file

@ -273,15 +273,6 @@ sub extrude_path {
$path->simplify(&Slic3r::SCALED_RESOLUTION);
# detect arcs
if ($self->config->gcode_arcs && !$params{dont_detect_arcs}) {
my $gcode = "";
foreach my $arc_path ($path->detect_arcs) {
$gcode .= $self->extrude_path($arc_path, $description, %params, dont_detect_arcs => 1);
}
return $gcode;
}
# go to first point of extrusion path
my $gcode = "";
my $first_point = $path->first_point;
@ -330,39 +321,7 @@ sub extrude_path {
# extrude arc or line
$gcode .= ";_BRIDGE_FAN_START\n" if $path->is_bridge;
my $path_length = 0;
if ($path->isa('Slic3r::ExtrusionPath::Arc')) {
$path_length = unscale $path->length;
# calculate extrusion length for this arc
my $E = 0;
if ($e) {
$E = $e * $path_length;
$self->extruder->e(0) if $self->config->use_relative_e_distances;
$self->total_extrusion_length($self->total_extrusion_length + $E);
$E = $self->extruder->e($self->extruder->e + $E);
}
# compose G-code line
my $point = $path->points->[-1];
$gcode .= $path->orientation eq 'cw' ? "G2" : "G3";
$gcode .= sprintf " X%.3f Y%.3f",
($point->x * &Slic3r::SCALING_FACTOR) + $self->shift_x - $self->extruder->extruder_offset->[X],
($point->y * &Slic3r::SCALING_FACTOR) + $self->shift_y - $self->extruder->extruder_offset->[Y]; #**
# XY distance of the center from the start position
$gcode .= sprintf " I%.3f J%.3f",
($path->center->[X] - $self->last_pos->[X]) * &Slic3r::SCALING_FACTOR,
($path->center->[Y] - $self->last_pos->[Y]) * &Slic3r::SCALING_FACTOR;
$gcode .= sprintf(" %s%.5f", $self->config->extrusion_axis, $E)
if $E;
$gcode .= " F$F";
$gcode .= " ; $description"
if $self->config->gcode_comments;
$gcode .= "\n";
$self->wipe_path(undef);
} else {
{
my $local_F = $F;
foreach my $line ($path->lines) {
$path_length += my $line_length = unscale $line->length;

133
lib/Slic3r/GCode/ArcFitting.pm Normal file
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@ -0,0 +1,133 @@
package Slic3r::GCode::ArcFitting;
use Moo;
use Slic3r::Geometry qw(X Y PI scale unscale deg2rad);
extends 'Slic3r::GCode::Reader';
has 'config' => (is => 'ro', required => 1);
has 'max_angle' => (is => 'rw', default => sub { deg2rad(15) });
has 'len_epsilon' => (is => 'rw', default => sub { scale 10 });
has 'parallel_degrees_limit' => (is => 'rw', default => sub { abs(deg2rad(3)) });
sub process {
my $self = shift;
my ($gcode) = @_;
my $new_gcode = "";
my $buffer = "";
my @cur_path = ();
my $cur_len = 0;
my $cur_relative_angle = 0;
$self->parse($gcode, sub {
my ($reader, $cmd, $args, $info) = @_;
if ($info->{extruding} && $info->{dist_XY} > 0) {
my $point = Slic3r::Point->new_scale($args->{X}, $args->{Y});
if (@cur_path >= 2) {
if ($cur_path[-1]->distance_to($point) > $self->len_epsilon) {
# if the last distance is not compatible with the current arc, flush it
$new_gcode .= $self->flush_path(\@cur_path, \$buffer);
} elsif (@cur_path >= 3) {
my $rel_angle = relative_angle(@cur_path[-2,-1], $point);
if (($cur_relative_angle != 0 && abs($rel_angle - $cur_relative_angle) > $self->parallel_degrees_limit) # relative angle is too different from the previous one
|| abs($rel_angle) < $self->parallel_degrees_limit # relative angle is almost parallel
|| $rel_angle > $self->max_angle) { # relative angle is excessive (too sharp)
# in these cases, $point does not really look like an additional point of the current arc
$new_gcode .= $self->flush_path(\@cur_path, \$buffer);
}
}
}
if (@cur_path == 0) {
# we're starting a path, so let's prepend the previous position
push @cur_path, Slic3r::Point->new_scale($self->X, $self->Y), $point;
$buffer .= $info->{raw} . "\n";
$cur_len = $cur_path[0]->distance_to($cur_path[1]);
} else {
push @cur_path, $point;
$buffer .= $info->{raw} . "\n";
if (@cur_path == 3) {
# we have two segments, time to compute a reference angle
$cur_relative_angle = relative_angle(@cur_path[0,1,2]);
}
}
} else {
$new_gcode .= $self->flush_path(\@cur_path, \$buffer);
$new_gcode .= $info->{raw} . "\n";
}
});
$new_gcode .= $self->flush_path(\@cur_path, \$buffer);
return $new_gcode;
}
sub flush_path {
my ($self, $cur_path, $buffer) = @_;
my $gcode = "";
if (@$cur_path >= 3) {
# if we have enough points, then we have an arc
$$buffer =~ s/^/;/mg;
$gcode = "; these moves were replaced by an arc:\n" . $$buffer;
my $orientation = Slic3r::Geometry::point_is_on_left_of_segment($cur_path->[2], [ @$cur_path[0,1] ]) ? 'ccw' : 'cw';
# to find the center, we intersect the perpendicular lines
# passing by midpoints of $s1 and last segment
# a better method would be to draw all the perpendicular lines
# and find the centroid of the enclosed polygon, or to
# intersect multiple lines and find the centroid of the convex hull
# around the intersections
my $arc_center;
{
my $s1_mid = Slic3r::Line->new(@$cur_path[0,1])->midpoint;
my $last_mid = Slic3r::Line->new(@$cur_path[-2,-1])->midpoint;
my $rotation_angle = PI/2 * ($orientation eq 'ccw' ? -1 : 1);
my $ray1 = Slic3r::Line->new($s1_mid, $cur_path->[1]->clone->rotate($rotation_angle, $s1_mid));
my $last_ray = Slic3r::Line->new($last_mid, $cur_path->[-1]->clone->rotate($rotation_angle, $last_mid));
$arc_center = $ray1->intersection($last_ray, 0) or next POINT;
}
my $radius = $arc_center->distance_to($cur_path->[0]);
my $total_angle = Slic3r::Geometry::angle3points($arc_center, @$cur_path[0,-1]);
my $length = $orientation eq 'ccw'
? $radius * $total_angle
: $radius * (2*PI - $total_angle);
# compose G-code line
$gcode .= $orientation eq 'cw' ? "G2" : "G3";
$gcode .= sprintf " X%.3f Y%.3f", map unscale($_), @{$cur_path->[-1]}; # destination point
# XY distance of the center from the start position
$gcode .= sprintf " I%.3f J%.3f", map { unscale($arc_center->[$_] - $cur_path->[0][$_]) } (X,Y);
my $E = 0; # TODO: compute E using $length
$gcode .= sprintf(" %s%.5f", $self->config->extrusion_axis, $E)
if $E;
my $F = 0; # TODO: extract F from original moves
$gcode .= " F$F\n";
} else {
$gcode = $$buffer;
}
$$buffer = "";
splice @$cur_path, 0, $#$cur_path; # keep last point as starting position for next path
return $gcode;
}
sub relative_angle {
my ($p1, $p2, $p3) = @_;
my $s1 = Slic3r::Line->new($p1, $p2);
my $s2 = Slic3r::Line->new($p2, $p3);
my $s1_angle = $s1->atan;
my $s2_angle = $s2->atan;
$s1_angle += 2*PI if $s1_angle < 0;
$s2_angle += 2*PI if $s2_angle < 0;
return $s2_angle - $s1_angle;
}
1;

13
lib/Slic3r/GCode/Layer.pm
View file

@ -10,6 +10,7 @@ has 'shift' => (is => 'ro', required => 1);
has 'spiralvase' => (is => 'lazy');
has 'vibration_limit' => (is => 'lazy');
has 'arc_fitting' => (is => 'lazy');
has 'skirt_done' => (is => 'rw', default => sub { {} }); # print_z => 1
has 'brim_done' => (is => 'rw');
has 'second_layer_things_done' => (is => 'rw');
@ -31,6 +32,14 @@ sub _build_vibration_limit {
: undef;
}
sub _build_arc_fitting {
my $self = shift;
return $Slic3r::Config->gcode_arcs
? Slic3r::GCode::ArcFitting->new(config => $self->gcodegen->config)
: undef;
}
sub process_layer {
my $self = shift;
my ($layer, $object_copies) = @_;
@ -175,6 +184,10 @@ sub process_layer {
$gcode = $self->vibration_limit->process($gcode)
if $Slic3r::Config->vibration_limit != 0;
# apply arc fitting if enabled
$gcode = $self->arc_fitting->process($gcode)
if $Slic3r::Config->gcode_arcs;
return $gcode;
}