New option for turning autocentering off. #404

lib/Slic3r/Config.pm

@@ -62,7 +62,7 @@ our $Options = {
     # printer options
     'print_center' => {
         label   => 'Print center',
-        tooltip => 'Enter the G-code coordinates of the point you want to center your print around.',
+        tooltip => 'These G-code coordinates are used to center your plater viewport.',
         sidetext => 'mm',
         cli     => 'print-center=s',
         type    => 'point',

lib/Slic3r/GUI.pm

@@ -54,6 +54,7 @@ our $Settings = {
     _ => {
         mode => 'simple',
         version_check => 1,
+        autocenter => 1,
     },
 };
 
@@ -88,6 +89,7 @@ sub OnInit {
         $Settings = $ini if $ini;
         $last_version = $Settings->{_}{version};
         $Settings->{_}{mode} ||= 'expert';
+        $Settings->{_}{autocenter} //= 1;
     }
     $Settings->{_}{version} = $Slic3r::VERSION;
     Slic3r::GUI->save_settings;

lib/Slic3r/GUI/Plater.pm

@@ -409,11 +409,16 @@ sub load_model_object {
         
         # add a default instance and center object around origin
         $o->center_around_origin;
-        $o->add_instance(offset => [0,0]);
+        $o->add_instance(offset => [ @{$self->{config}->print_center} ]);
     }
     
     $self->{print}->add_model_object($o);
     
+    # if user turned autocentering off, automatic arranging would disappoint them
+    if (!$Slic3r::GUI::Settings->{_}{autocenter}) {
+        $need_arrange = 0;
+    }
+    
     $self->object_loaded($#{ $self->{objects} }, no_arrange => !$need_arrange);
 }
 
@@ -484,7 +489,13 @@ sub increase {
     );
     $self->{print}->objects->[$obj_idx]->add_copy(@{$i->offset});
     $self->{list}->SetItem($obj_idx, 1, $model_object->instances_count);
-    $self->arrange;
+    
+    # only autoarrange if user has autocentering enabled
+    if ($Slic3r::GUI::Settings->{_}{autocenter}) {
+        $self->arrange;
+    } else {
+        $self->{canvas}->Refresh;
+    }
 }
 
 sub decrease {
@@ -573,7 +584,8 @@ sub changescale {
         $object->transform_thumbnail($self->{model}, $obj_idx);
     }
     $self->selection_changed(1);  # refresh info (size, volume etc.)
-    $self->arrange;
+    $self->update;
+    $self->{canvas}->Refresh;
 }
 
 sub arrange {
@@ -584,7 +596,7 @@ sub arrange {
     };
     # ignore arrange warnings on purpose
     
-    $self->update;
+    $self->update(1);
     $self->{canvas}->Refresh;
 }
 
@@ -864,9 +876,11 @@ sub clean_instance_thumbnails {
 # this method gets called whenever print center is changed or the objects' bounding box changes
 # (i.e. when an object is added/removed/moved/rotated/scaled)
 sub update {
-    my $self = shift;
+    my ($self, $force_autocenter) = @_;
     
-    $self->{model}->center_instances_around_point($self->{config}->print_center);
+    if ($Slic3r::GUI::Settings->{_}{autocenter} || $force_autocenter) {
+        $self->{model}->center_instances_around_point($self->{config}->print_center);
+    }
     
     # sync model and print object instances
     for my $obj_idx (0..$#{$self->{objects}}) {

lib/Slic3r/GUI/Preferences.pm

@@ -37,6 +37,13 @@ sub new {
                 tooltip     => 'If this is enabled, Slic3r will prompt the last output directory instead of the one containing the input files.',
                 default     => $Slic3r::GUI::Settings->{_}{remember_output_path},
             },
+            {
+                opt_key     => 'autocenter',
+                type        => 'bool',
+                label       => 'Auto-center parts',
+                tooltip     => 'If this is enabled, Slic3r will auto-center objects around the configured print center.',
+                default     => $Slic3r::GUI::Settings->{_}{autocenter},
+            },
         ],
         on_change => sub { $self->{values}{$_[0]} = $_[1] },
         label_width => 100,