Bugfix in utils/pdf-slices.pl, wrong shift caused slices to be outside the media box

lib/Slic3r/Model.pm

@@ -218,6 +218,17 @@ sub center_instances_around_point {
     }
 }
 
+sub align_instances_to_origin {
+    my ($self) = @_;
+    
+    my $bb = $self->bounding_box;
+    return if !defined $bb;
+    
+    my $new_center = $bb->size;
+    $new_center->translate(-$new_center->x/2, -$new_center->y/2);  #//
+    $self->center_instances_around_point($new_center);
+}
+
 sub translate {
     my $self = shift;
     my @shift = @_;

utils/pdf-slices.pl

@@ -12,7 +12,7 @@ BEGIN {
 use Getopt::Long qw(:config no_auto_abbrev);
 use PDF::API2;
 use Slic3r;
-use Slic3r::Geometry qw(unscale X Y);
+use Slic3r::Geometry qw(scale unscale X Y);
 
 use constant mm => 25.4 / 72;
 
@@ -31,16 +31,21 @@ my %opt = ();
     # prepare config
     my $config = Slic3r::Config->new;
     $config->set('layer_height', $opt{layer_height}) if $opt{layer_height};
+    $config->set('print_center', [0,0]);
+    
+    # read model
+    my $model = Slic3r::Model->read_from_file(my $input_file = $ARGV[0]);
     
     # init print object
     my $sprint = Slic3r::Print::Simple->new;
     $sprint->apply_config($config);
-    $sprint->set_model(Slic3r::Model->read_from_file(my $input_file = $ARGV[0]));
+    $sprint->set_model($model);
     my $print = $sprint->_print;
     
     # compute sizes
     my $bb = $print->bounding_box;
-    my $mediabox = [ map unscale($_)/mm, @{$bb->size} ];
+    my $size = $bb->size;
+    my $mediabox = [ map unscale($_)/mm, @{$size} ];
     
     # init PDF
     my $pdf = PDF::API2->new();
@@ -48,20 +53,27 @@ my %opt = ();
     
     # slice and build output geometry
     $_->slice for @{$print->objects};
-    foreach my $layer (@{ $print->objects->[0]->layers }) {
-        my $page = $pdf->page();
-        $page->mediabox(@$mediabox);
-        my $content = $page->gfx;
-        $content->fillcolor($color, 1);
+    foreach my $object (@{ $print->objects }) {
+        my $shift = $object->_shifted_copies->[0];
+        $shift->translate(map $_/2, @$size);
+        
+        foreach my $layer (@{ $object->layers }) {
+            my $page = $pdf->page();
+            $page->mediabox(@$mediabox);
+            my $content = $page->gfx;
+            $content->fillcolor($color, 1);
         
-        foreach my $expolygon (@{$layer->slices}) {
-            $content->poly(map { unscale($_->x)/mm, unscale($_->y)/mm } @{$expolygon->contour});  #)
-            $content->close;
-            foreach my $hole (@{$expolygon->holes}) {
-                $content->poly(map { unscale($_->x)/mm, unscale($_->y)/mm } @$hole);  #)
+            foreach my $expolygon (@{$layer->slices}) {
+                $expolygon = $expolygon->clone;
+                $expolygon->translate(@$shift);
+                $content->poly(map { unscale($_->x)/mm, unscale($_->y)/mm } @{$expolygon->contour});  #)
                 $content->close;
+                foreach my $hole (@{$expolygon->holes}) {
+                    $content->poly(map { unscale($_->x)/mm, unscale($_->y)/mm } @$hole);  #)
+                    $content->close;
+                }
+                $content->fill;  # non-zero by default
             }
-            $content->fill;  # non-zero by default
         }
     }