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New experimental --gcode-arcs options to generate G2/G3 commands. #23

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This commit is contained in:
Alessandro Ranellucci 2011-10-20 18:11:59 +02:00
parent 7f341cfcd3
commit 6d6533831e
13 changed files with 333 additions and 21 deletions
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112
lib/Slic3r/ExtrusionPath.pm
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@ -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;