#495 Add bounding_box to placeholders

src/libslic3r/GCode.cpp

@@ -1322,7 +1322,6 @@ void GCode::_do_export(Print &print, FILE *file)
             _write_format(file, "; first layer extrusion width = %.2fmm\n",   region->flow(frPerimeter, first_layer_height, false, true, -1., *first_object).width);
         _write_format(file, "\n");
     }
-    if (this->config().gcode_label_objects) {
     BoundingBoxf3 global_bounding_box;
     for (PrintObject *print_object : print.objects()) {
         this->m_ordered_objects.push_back(print_object);
@@ -1340,22 +1339,25 @@ void GCode::_do_export(Print &print, FILE *file)
             } else {
                 global_bounding_box.merge(m_bounding_box);
             }
+            if (this->config().gcode_label_objects) {
                 _write_format(file, "; object:{\"name\":\"%s\",\"id\":\"%s id:%d copy %d\",\"object_center\":[%f,%f,%f],\"boundingbox_center\":[%f,%f,%f],\"boundingbox_size\":[%f,%f,%f]}\n",
                     object_name.c_str(), print_object->model_object()->name.c_str(), this->m_ordered_objects.size() - 1, copy_id,
                     m_bounding_box.center().x(), m_bounding_box.center().y(), 0.,
                     m_bounding_box.center().x(), m_bounding_box.center().y(), m_bounding_box.center().z(),
                     m_bounding_box.size().x(), m_bounding_box.size().y(), m_bounding_box.size().z()
                 );
+            }
             copy_id++;
         }
     }
+    if (this->config().gcode_label_objects) {
         _write_format(file, "; plater:{\"center\":[%f,%f,%f],\"boundingbox_center\":[%f,%f,%f],\"boundingbox_size\":[%f,%f,%f]}\n",
             global_bounding_box.center().x(), global_bounding_box.center().y(), 0.,
             global_bounding_box.center().x(), global_bounding_box.center().y(), global_bounding_box.center().z(),
             global_bounding_box.size().x(), global_bounding_box.size().y(), global_bounding_box.size().z()
         );
-        _write_format(file, "\n");
     }
+    _write_format(file, "\n");
 
     print.throw_if_canceled();
     
@@ -1465,6 +1467,8 @@ void GCode::_do_export(Print &print, FILE *file)
     m_placeholder_parser.set("has_wipe_tower", has_wipe_tower);
     m_placeholder_parser.set("has_single_extruder_multi_material_priming", has_wipe_tower && print.config().single_extruder_multi_material_priming);
     m_placeholder_parser.set("total_toolchanges", std::max(0, print.wipe_tower_data().number_of_toolchanges)); // Check for negative toolchanges (single extruder mode) and set to 0 (no tool change).
+    m_placeholder_parser.set("bounding_box", new ConfigOptionFloats({ global_bounding_box.min.x(), global_bounding_box.min.y(), global_bounding_box.max.x(), global_bounding_box.max.y() }));
+
 
     std::string start_gcode = this->placeholder_parser_process("start_gcode", print.config().start_gcode.value, initial_extruder_id);
     // Set bed temperature if the start G-code does not contain any bed temp control G-codes.

src/libslic3r/PrintConfig.cpp

@@ -2991,7 +2991,8 @@ void PrintConfigDef::init_fff_params()
                    "such commands will not be prepended automatically so you're free to customize "
                    "the order of heating commands and other custom actions. Note that you can use "
                    "placeholder variables for all Slic3r settings, so you can put "
-                   "a \"M109 S[first_layer_temperature]\" command wherever you want.");
+                   "a \"M109 S[first_layer_temperature]\" command wherever you want."
+                    "\n placeholders: initial_extruder, total_layer_count, has_wipe_tower, has_single_extruder_multi_material_priming, total_toolchanges, bounding_box[minx,miny,maxx,maxy]");
     def->multiline = true;
     def->full_width = true;
     def->height = 12;