Add seam gap

src/libslic3r/GCode.cpp

@@ -2862,7 +2862,8 @@ std::string GCodeGenerator::extrude_loop(const ExtrusionLoop &loop_src, const GC
     // if polyline was shorter than the clipping distance we'd get a null polyline, so
     // we discard it in that case.
     if (m_enable_loop_clipping)
-        clip_end(smooth_path, scaled<double>(EXTRUDER_CONFIG(nozzle_diameter)) * LOOP_CLIPPING_LENGTH_OVER_NOZZLE_DIAMETER, scaled<double>(min_gcode_segment_length));
+    //Y21
+        clip_end(smooth_path, scaled<double>(EXTRUDER_CONFIG(nozzle_diameter)) * (m_config.seam_gap.value / 100), scaled<double>(min_gcode_segment_length));
 
     if (smooth_path.empty())
         return {};

src/libslic3r/Preset.cpp

@@ -473,6 +473,8 @@ static std::vector<std::string> s_Preset_print_options {
     ,"first_layer_infill_speed"
     //w11
     ,"detect_narrow_internal_solid_infill"
+    //Y21
+    ,"seam_gap"
 };
 
 static std::vector<std::string> s_Preset_filament_options {

src/libslic3r/Print.cpp

@@ -142,6 +142,8 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
         "retract_restart_extra",
         "retract_restart_extra_toolchange",
         "retract_speed",
+        //Y21
+        "seam_gap",
         "single_extruder_multi_material_priming",
         "slowdown_below_layer_time",
         "solid_infill_acceleration",

src/libslic3r/PrintConfig.cpp

@@ -2533,6 +2533,15 @@ void PrintConfigDef::init_fff_params()
     def->mode = comSimple;
     def->set_default_value(new ConfigOptionEnum<SeamPosition>(spAligned));
 
+//Y21
+    def = this->add("seam_gap", coPercent);
+    def->label = L("Seam gap");
+    def->tooltip = L("In order to reduce the visibility of the seam in a closed loop extrusion, the loop is interrupted and shortened by a specified amount.\n" "This amount as a percentage of the current extruder diameter. The default value for this parameter is 15");
+    def->sidetext = L("%");
+    def->min = 0;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionPercent(15));
+
     def = this->add("staggered_inner_seams", coBool);
     def->label = L("Staggered inner seams");
     // TRN PrintSettings: "Staggered inner seams"

src/libslic3r/PrintConfig.hpp

@@ -524,6 +524,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,               raft_first_layer_expansion))
     ((ConfigOptionInt,                 raft_layers))
     ((ConfigOptionEnum<SeamPosition>,  seam_position))
+    //Y21
+    ((ConfigOptionPercent,            seam_gap))
     ((ConfigOptionBool,                staggered_inner_seams))
 //  ((ConfigOptionFloat,               seam_preferred_direction))
 //  ((ConfigOptionFloat,               seam_preferred_direction_jitter))

src/libslic3r/PrintObject.cpp

@@ -868,6 +868,8 @@ bool PrintObject::invalidate_state_by_config_options(
             steps.emplace_back(posSlice);
         } else if (
                opt_key == "seam_position"
+            //Y21
+            || opt_key == "seam_gap"
             || opt_key == "seam_preferred_direction"
             || opt_key == "seam_preferred_direction_jitter"
             || opt_key == "support_material_speed"