Bugfix: movement between objects in sequential printing mode was going too far away. #2013 #2007

lib/Slic3r/Print.pm

@@ -953,6 +953,7 @@ sub write_gcode {
         
         my $finished_objects = 0;
         for my $obj_idx (@obj_idx) {
+            my $object = $self->objects->[$obj_idx];
             for my $copy (@{ $self->objects->[$obj_idx]->_shifted_copies }) {
                 # move to the origin position for the copy we're going to print.
                 # this happens before Z goes down to layer 0 again, so that 
@@ -960,7 +961,7 @@ sub write_gcode {
                 if ($finished_objects > 0) {
                     $gcodegen->set_shift(map unscale $copy->[$_], X,Y);
                     print $fh $gcodegen->retract;
-                    print $fh $gcodegen->G0(Slic3r::Point->new(0,0), undef, 0, $gcodegen->config->travel_speed*60, 'move to origin position for next object');
+                    print $fh $gcodegen->G0($object->_copies_shift->negative, undef, 0, $gcodegen->config->travel_speed*60, 'move to origin position for next object');
                 }
                 
                 my $buffer = Slic3r::GCode::CoolingBuffer->new(
@@ -968,7 +969,6 @@ sub write_gcode {
                     gcodegen    => $gcodegen,
                 );
                 
-                my $object = $self->objects->[$obj_idx];
                 my @layers = sort { $a->print_z <=> $b->print_z } @{$object->layers}, @{$object->support_layers};
                 for my $layer (@layers) {
                     # if we are printing the bottom layer of an object, and we have already finished

t/gcode.t

@@ -1,4 +1,4 @@
-use Test::More tests => 8;
+use Test::More tests => 9;
 use strict;
 use warnings;
 
@@ -9,7 +9,7 @@ BEGIN {
 
 use List::Util qw(first);
 use Slic3r;
-use Slic3r::Geometry qw(scale);
+use Slic3r::Geometry qw(scale convex_hull);
 use Slic3r::Test;
 
 {
@@ -46,6 +46,7 @@ use Slic3r::Test;
     # - complete objects does not crash
     # - no hard-coded "E" are generated
     # - Z moves are correctly generated for both objects
+    # - no travel moves go outside skirt
     my $config = Slic3r::Config->new_from_defaults;
     $config->set('gcode_comments', 1);
     $config->set('complete_objects', 1);
@@ -56,16 +57,30 @@ use Slic3r::Test;
     my $print = Slic3r::Test::init_print('20mm_cube', config => $config, duplicate => 2);
     ok my $gcode = Slic3r::Test::gcode($print), "complete_objects";
     my @z_moves = ();
+    my @travel_moves = ();  # array of scaled points
+    my @extrusions = ();    # array of scaled points
     Slic3r::GCode::Reader->new->parse($gcode, sub {
         my ($self, $cmd, $args, $info) = @_;
         fail 'unexpected E argument' if defined $args->{E};
         if (defined $args->{Z}) {
             push @z_moves, $args->{Z};
         }
+        
+        if ($info->{dist_XY}) {
+            if ($info->{extruding} || $args->{A}) {
+                push @extrusions, Slic3r::Point->new_scale($info->{new_X}, $info->{new_Y});
+            } else {
+                push @travel_moves, Slic3r::Point->new_scale($info->{new_X}, $info->{new_Y})
+                    if @extrusions;  # skip initial travel move to first skirt point
+            }
+        }
     });
     my $layer_count = 20/0.4;  # cube is 20mm tall
     is scalar(@z_moves), 2*$layer_count, 'complete_objects generates the correct number of Z moves';
     is_deeply [ @z_moves[0..($layer_count-1)] ], [ @z_moves[$layer_count..$#z_moves] ], 'complete_objects generates the correct Z moves';
+    
+    my $convex_hull = convex_hull(\@extrusions);
+    ok !(defined first { !$convex_hull->contains_point($_) } @travel_moves), 'all travel moves happen within skirt';
 }
 
 {

xs/src/Point.cpp

@@ -190,6 +190,12 @@ Point::projection_onto(const Line &line) const
     }
 }
 
+Point
+Point::negative() const
+{
+    return Point(-this->x, -this->y);
+}
+
 Point
 operator+(const Point& point1, const Point& point2)
 {

xs/src/Point.hpp

@@ -43,6 +43,7 @@ class Point
     double ccw(const Line &line) const;
     Point projection_onto(const MultiPoint &poly) const;
     Point projection_onto(const Line &line) const;
+    Point negative() const;
     
     #ifdef SLIC3RXS
     void from_SV(SV* point_sv);

xs/xsp/Point.xsp

@@ -35,6 +35,8 @@
         %code{% RETVAL = new Point(THIS->projection_onto(*polyline)); %};
     Clone<Point> projection_onto_line(Line* line)
         %code{% RETVAL = new Point(THIS->projection_onto(*line)); %};
+    Clone<Point> negative()
+        %code{% RETVAL = new Point(THIS->negative()); %};
 
 %{