NEW: add best_object_pos for auto-arranging

For i3 printers, best object position may not be the bed center,
we need to align objects to the specified best_object_pos.

Jira: STUDIO-4133

Change-Id: I06e31e597d2dd8288eb24a52d836cc8a134a4111

src/libslic3r/Arrange.cpp

@@ -153,16 +153,16 @@ Points get_shrink_bedpts(const DynamicPrintConfig* print_cfg, const ArrangeParam
 // Slic3r.
 template<class PConf>
 void fill_config(PConf& pcfg, const ArrangeParams &params) {
-
-    if (params.is_seq_print) {
-        // Start placing the items from the center of the print bed
-        pcfg.starting_point = PConf::Alignment::BOTTOM_LEFT;
-    }
-    else {
-        // Start placing the items from the center of the print bed
-        pcfg.starting_point = PConf::Alignment::TOP_RIGHT;
-    }
-
+    
+        if (params.is_seq_print) {
+            // Start placing the items from the center of the print bed
+            pcfg.starting_point = PConf::Alignment::BOTTOM_LEFT;
+        }
+        else {
+            // Start placing the items from the center of the print bed
+            pcfg.starting_point = PConf::Alignment::TOP_RIGHT;
+        }
+    
     if (params.do_final_align) {
         // Align the arranged pile into the center of the bin
         pcfg.alignment = PConf::Alignment::CENTER;
@@ -564,6 +564,14 @@ public:
         m_norm = std::sqrt(m_bin_area);
         fill_config(m_pconf, params);
         this->params = params;
+
+        // if best object center is not bed center, specify starting point here
+        if (std::abs(this->params.align_center.x() - 0.5) > 0.001 || std::abs(this->params.align_center.y() - 0.5) > 0.001) {
+            auto binbb = sl::boundingBox(m_bin);
+            m_pconf.best_object_pos = binbb.minCorner() + Point{ binbb.width() * this->params.align_center.x(), binbb.height() * this->params.align_center.y() };
+            m_pconf.alignment = PConfig::Alignment::USER_DEFINED;
+        }
+
         for (auto& region : m_pconf.m_excluded_regions) {
             Box  bb = region.boundingBox();
             m_excluded_and_extruCali_regions.emplace_back(bb);

src/libslic3r/Arrange.hpp

@@ -127,6 +127,7 @@ struct ArrangeParams {
     float clearance_height_to_lid = 0;
     float cleareance_radius = 0;
     float printable_height = 256.0;
+    Vec2d align_center{ 0.5,0.5 };
 
     ArrangePolygons excluded_regions;   // regions cant't be used
     ArrangePolygons nonprefered_regions; // regions can be used but not prefered

src/libslic3r/Preset.cpp

@@ -853,6 +853,7 @@ static std::vector<std::string> s_Preset_printer_options {
     // BBS
     "scan_first_layer", "machine_load_filament_time", "machine_unload_filament_time", "machine_pause_gcode", "template_custom_gcode",
     "nozzle_type","auxiliary_fan", "nozzle_volume","upward_compatible_machine", "z_hop_types","support_chamber_temp_control","support_air_filtration","printer_structure","thumbnail_size",
+    "best_object_pos",
     //OrcaSlicer
     "host_type", "print_host", "printhost_apikey",
     "print_host_webui",

src/libslic3r/PrintConfig.cpp

@@ -502,7 +502,7 @@ void PrintConfigDef::init_common_params()
     def->mode = comAdvanced;
     def->cli = ConfigOptionDef::nocli;
     def->set_default_value(new ConfigOptionEnum<AuthorizationType>(atKeyPassword));
-
+    
     // temporary workaround for compatibility with older Slicer
     {
         def = this->add("preset_name", coString);
@@ -1761,6 +1761,12 @@ void PrintConfigDef::init_fff_params()
     def->mode = comDevelop;
     def->set_default_value(new ConfigOptionEnum<PrinterStructure>(psUndefine));
 
+    def = this->add("best_object_pos", coPoint);
+    def->label = L("Best object position");
+    def->tooltip = L("Best auto arranging position in range [0,1] w.r.t. bed shape.");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionPoint(Vec2d(0.5, 0.5)));
+
     def = this->add("auxiliary_fan", coBool);
     def->label = L("Auxiliary part cooling fan");
     def->tooltip = L("Enable this option if machine has auxiliary part cooling fan");

src/libslic3r/PrintConfig.hpp

@@ -956,6 +956,7 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionInts,               fan_min_speed))
     ((ConfigOptionFloats,             min_layer_height))
     ((ConfigOptionFloat,              printable_height))
+    ((ConfigOptionPoint,              best_object_pos))
     ((ConfigOptionFloats,             slow_down_min_speed))
     ((ConfigOptionFloats,             nozzle_diameter))
     ((ConfigOptionBool,               reduce_infill_retraction))