Fix 'avoid crossing perimeters' when wipe enabled.

Also add a new setting to say if the wipe is really needed if 'avoid crossing perimeters' activated & no crossing.
supermerill/SuperSlicer#1069

resources/ui_layout/extruder.ui

@@ -33,6 +33,7 @@ group:Retraction wipe
 	setting:idx:wipe
 	setting:idx:wipe_speed
 	setting:idx:retract_before_wipe
+	setting:idx:wipe_only_crossing
 	setting:idx:wipe_extra_perimeter
 	setting:idx:seam_gap
 group:Retraction when tool is disabled (advanced settings for multi-extruder setups)

src/libslic3r/GCode.cpp

@@ -3382,6 +3382,7 @@ std::string GCode::extrude_loop(const ExtrusionLoop &original_loop, const std::s
                     prev_point = current_point;
                     current_point = pt;
                     gcode += m_writer.travel_to_xy(this->point_to_gcode(pt), 0.0, config().gcode_comments ? "; extra wipe" : "");
+                    this->set_last_pos(pt);
                 }
             }
         }
@@ -3417,6 +3418,7 @@ std::string GCode::extrude_loop(const ExtrusionLoop &original_loop, const std::s
         pt.rotate(angle, current_point);
         // generate the travel move
         gcode += m_writer.travel_to_xy(this->point_to_gcode(pt), 0.0, "move inwards before travel");
+        this->set_last_pos(pt);
         gcode += ";" + GCodeProcessor::Wipe_End_Tag + "\n";
 
         // also shift the wipe on retract
@@ -3441,6 +3443,25 @@ std::string GCode::extrude_loop(const ExtrusionLoop &original_loop, const std::s
     }
                 }
             }
+            if (best_sqr_dist == nd * nd * 2) {
+                //try to find an edge
+                for (size_t poly_idx = 0; poly_idx < polys.size(); poly_idx++) {
+                    Polygon& poly = polys[poly_idx];
+                    if (poly.is_clockwise() ^ original_polygon.is_clockwise())
+                        poly.reverse();
+                    poly.points.push_back(poly.points.front());
+                    for (size_t pt_idx = 0; pt_idx < poly.points.size()-1; pt_idx++) {
+                        if (Line{ poly.points[pt_idx], poly.points[pt_idx + 1] }.distance_to_squared(pt) < best_sqr_dist) {
+                            poly.points.insert(poly.points.begin() + pt_idx + 1, pt);
+                            best_sqr_dist = 0;
+                            best_poly_idx = poly_idx;
+                            best_pt_idx = pt_idx + 1;
+                            poly.points.erase(poly.points.end() - 1);
+                            break;
+                        }
+                    }
+                }
+            }
             if (best_sqr_dist == nd * nd * 2) {
                 //can't find a path, use the old one
                 //BOOST_LOG_TRIVIAL(warning) << "Warn: can't find a proper path for wipe on retract. Layer " << m_layer_index << ", pos " << this->point_to_gcode(pt).x() << " : " << this->point_to_gcode(pt).y() << " !";
@@ -4228,40 +4249,49 @@ Polyline GCode::travel_to(std::string &gcode, const Point &point, ExtrusionRole
         this->origin in order to get G-code coordinates.  */
     Polyline travel { this->last_pos(), point };
 
-    // check / compute avoid_crossing_perimeters
-    bool will_cross_perimeter = this->can_cross_perimeter(travel);
     // check whether wipe could be disabled without causing visible stringing
     bool could_be_wipe_disabled = false;
 
+    //can use the avoid crossing algo?
+    bool can_avoid_cross_peri = m_config.avoid_crossing_perimeters
+        && !m_avoid_crossing_perimeters.disabled_once()
+        && m_avoid_crossing_perimeters.is_init()
+        && !(m_config.avoid_crossing_not_first_layer && this->on_first_layer());
+
+    // check / compute avoid_crossing_perimeters
+    bool will_cross_perimeter = this->can_cross_perimeter(travel, can_avoid_cross_peri);
+
     // if a retraction would be needed (with a low min_dist threshold), try to use avoid_crossing_perimeters to plan a
     // multi-hop travel path inside the configuration space
     if (will_cross_perimeter && this->needs_retraction(travel, role, scale_d(EXTRUDER_CONFIG_WITH_DEFAULT(nozzle_diameter, 0.4)) * 3)
-        && m_config.avoid_crossing_perimeters
-        && ! m_avoid_crossing_perimeters.disabled_once()
-        && m_avoid_crossing_perimeters.is_init()
-        && !(m_config.avoid_crossing_not_first_layer && this->on_first_layer())) {
+        && can_avoid_cross_peri) {
         travel = m_avoid_crossing_perimeters.travel_to(*this, point, &could_be_wipe_disabled);
     }
+    if(can_avoid_cross_peri)
+        will_cross_perimeter = this->can_cross_perimeter(travel, false);
 
     // check whether a straight travel move would need retraction
     bool needs_retraction = this->needs_retraction(travel, role);
+    if (m_config.only_retract_when_crossing_perimeters)
+        needs_retraction = needs_retraction && will_cross_perimeter;
 
     // Re-allow avoid_crossing_perimeters for the next travel moves
     m_avoid_crossing_perimeters.reset_once_modifiers();
 
     // generate G-code for the travel move
     if (needs_retraction) {
-        if (m_config.avoid_crossing_perimeters && could_be_wipe_disabled)
+        if (m_config.avoid_crossing_perimeters && could_be_wipe_disabled && EXTRUDER_CONFIG_WITH_DEFAULT(wipe_only_crossing, true))
             m_wipe.reset_path();
 
         Point last_post_before_retract = this->last_pos();
         gcode += this->retract();
         // When "Wipe while retracting" is enabled, then extruder moves to another position, and travel from this position can cross perimeters.
-        // Because of it, it is necessary to call avoid crossing perimeters for the path between previous last_post and last_post after calling retraction()
-        if (last_post_before_retract != this->last_pos() && m_config.avoid_crossing_perimeters) {
-            Polyline retract_travel = m_avoid_crossing_perimeters.travel_to(*this, last_post_before_retract);
-            append(retract_travel.points, travel.points);
-            travel = std::move(retract_travel);
+        if (last_post_before_retract != this->last_pos() && can_avoid_cross_peri) {
+            // Is the distance is short enough to just shortcut it?
+            if (last_post_before_retract.distance_to(this->last_pos()) > scale_d(EXTRUDER_CONFIG_WITH_DEFAULT(nozzle_diameter, 0.4)) * 2) {
+                // Because of it, it is necessary to redo the thing
+                travel = m_avoid_crossing_perimeters.travel_to(*this, point);
+            }
         }
     } else {
         // Reset the wipe path when traveling, so one would not wipe along an old path.
@@ -4369,7 +4399,7 @@ bool GCode::needs_retraction(const Polyline& travel, ExtrusionRole role /*=erNon
     return true;
 }
 
-bool GCode::can_cross_perimeter(const Polyline& travel)
+bool GCode::can_cross_perimeter(const Polyline& travel, bool offset)
 {
     if(m_layer != nullptr)
     if ( (m_config.only_retract_when_crossing_perimeters && m_config.fill_density.value > 0) || m_config.avoid_crossing_perimeters)
@@ -4388,13 +4418,13 @@ bool GCode::can_cross_perimeter(const Polyline& travel)
         //if (inside) {
             //contained inside at least one bb
             //construct m_layer_slices_offseted if needed
-            if (m_layer_slices_offseted.layer != m_layer) {
+            if (m_layer_slices_offseted.layer != m_layer && offset) {
                 m_layer_slices_offseted.layer = m_layer;
                 m_layer_slices_offseted.diameter = scale_t(EXTRUDER_CONFIG_WITH_DEFAULT(nozzle_diameter, 0.4));
-                m_layer_slices_offseted.slices = offset_ex(m_layer->lslices, - m_layer_slices_offseted.diameter * 1.5);
+                m_layer_slices_offseted.slices = offset_ex(m_layer->lslices, -m_layer_slices_offseted.diameter * 1.5f);
             }
             // test if a expoly contains the entire travel
-            for (const ExPolygon &poly : m_layer_slices_offseted.slices)
+            for (const ExPolygon &poly : offset ? m_layer_slices_offseted.slices : m_layer->lslices)
                 if (poly.contains(travel)) {
                     return false;
                 }
@@ -4427,6 +4457,8 @@ std::string GCode::retract(bool toolchange)
         methods even if we performed wipe, since this will ensure the entire retraction
         length is honored in case wipe path was too short.  */
     gcode += toolchange ? m_writer.retract_for_toolchange() : m_writer.retract();
+
+    //check if need to lift
     bool need_lift = !m_writer.tool_is_extruder() || toolchange 
         || (BOOL_EXTRUDER_CONFIG(retract_lift_first_layer) && m_config.print_retract_lift.value != 0 && this->m_layer_index == 0) 
         || this->m_writer.get_extra_lift() > 0;

src/libslic3r/GCode.hpp

@@ -318,7 +318,7 @@ private:
 
     Polyline        travel_to(std::string& gcode, const Point &point, ExtrusionRole role);
     void            write_travel_to(std::string& gcode, const Polyline& travel, std::string comment);
-    bool            can_cross_perimeter(const Polyline& travel);
+    bool            can_cross_perimeter(const Polyline& travel, bool offset);
     bool            needs_retraction(const Polyline& travel, ExtrusionRole role = erNone, coordf_t max_min_dist = 0);
     std::string     retract(bool toolchange = false);
     std::string     unretract() { return m_writer.unlift() + m_writer.unretract(); }

src/libslic3r/Preset.cpp

@@ -697,7 +697,7 @@ const std::vector<std::string>& Preset::filament_options()
         "filament_retract_length", "filament_retract_lift", "filament_retract_lift_above", "filament_retract_lift_below", "filament_retract_speed", "filament_deretract_speed", "filament_retract_restart_extra", "filament_retract_before_travel",
         "filament_retract_layer_change", "filament_retract_before_wipe", 
         "filament_seam_gap",
-        "filament_wipe", "filament_wipe_extra_perimeter", "filament_wipe_speed",
+        "filament_wipe", "filament_wipe_only_crossing", "filament_wipe_extra_perimeter", "filament_wipe_speed",
         // Profile compatibility
         "filament_vendor", "compatible_prints", "compatible_prints_condition", "compatible_printers", "compatible_printers_condition", "inherits"
         //merill adds

src/libslic3r/Print.cpp

@@ -185,6 +185,7 @@ bool Print::invalidate_state_by_config_options(const std::vector<t_config_option
         "use_volumetric_e",
         "variable_layer_height",
         "wipe",
+        "wipe_only_crossing",
         "wipe_speed",
         "wipe_extra_perimeter"
     };

src/libslic3r/PrintConfig.cpp

@@ -4579,6 +4579,14 @@ void PrintConfigDef::init_fff_params()
     def->is_vector_extruder = true;
     def->set_default_value(new ConfigOptionBools{ false });
 
+    def = this->add("wipe_only_crossing", coBools);
+    def->label = L("Wipe only when crossing perimeters");
+    def->category = OptionCategory::extruders;
+    def->tooltip = L("Don't wipe when you don't cross a perimeter.");
+    def->mode = comAdvanced;
+    def->is_vector_extruder = true;
+    def->set_default_value(new ConfigOptionBools{ true });
+
     def = this->add("wipe_speed", coFloats);
     def->label = L("Wipe speed");
     def->category = OptionCategory::extruders;
@@ -4843,7 +4851,7 @@ void PrintConfigDef::init_fff_params()
         "retract_length", "retract_lift", "retract_lift_above", "retract_lift_below", "retract_speed", "deretract_speed", "retract_restart_extra", "retract_before_travel",
         "wipe_extra_perimeter", "wipe_speed",
         // bools
-        "retract_layer_change", "wipe",
+        "retract_layer_change", "wipe", "wipe_only_crossing",
         // percents
         "retract_before_wipe",
         // floatsOrPercents
@@ -4896,6 +4904,7 @@ void PrintConfigDef::init_extruder_option_keys()
         "tool_name",
         "wipe",
 		"wipe_extra_perimeter",
+        "wipe_only_crossing",
         "wipe_speed",
     };
 
@@ -4913,6 +4922,7 @@ void PrintConfigDef::init_extruder_option_keys()
         "seam_gap",
         "wipe",
         "wipe_extra_perimeter",
+        "wipe_only_crossing",
         "wipe_speed",
     };
     assert(std::is_sorted(m_extruder_retract_keys.begin(), m_extruder_retract_keys.end()));
@@ -6112,6 +6122,7 @@ std::unordered_set<std::string> prusa_export_to_remove_keys = {
 "wipe_advanced_nozzle_melted_volume",
 "wipe_advanced",
 "wipe_extra_perimeter",
+"wipe_only_crossing",
 "wipe_speed",
 "wipe_tower_brim",
 "xy_inner_size_compensation",

src/libslic3r/PrintConfig.hpp

@@ -1177,6 +1177,7 @@ public:
     ConfigOptionFloat               wipe_advanced_multiplier;
     ConfigOptionFloats              wipe_extra_perimeter;
     ConfigOptionEnum<WipeAlgo>      wipe_advanced_algo;
+    ConfigOptionBools               wipe_only_crossing;
     ConfigOptionFloats              wipe_speed;
     ConfigOptionFloat               z_step;
     ConfigOptionString              color_change_gcode;
@@ -1294,6 +1295,7 @@ protected:
         OPT_PTR(wipe_advanced_multiplier);
         OPT_PTR(wipe_advanced_algo);
         OPT_PTR(wipe_extra_perimeter);
+        OPT_PTR(wipe_only_crossing);
         OPT_PTR(wipe_speed);
         OPT_PTR(z_step);
         OPT_PTR(color_change_gcode);

src/slic3r/GUI/Tab.cpp

@@ -2348,6 +2348,7 @@ void TabFilament::add_filament_overrides_page()
                                         "filament_retract_layer_change",
                                         "filament_seam_gap",
                                         "filament_wipe",
+                                        "filament_wipe_extra_perimeter",
                                         "filament_wipe_speed",
                                         "filament_wipe_extra_perimeter"
                                      })
@@ -2377,6 +2378,7 @@ void TabFilament::update_filament_overrides_page()
                                             "filament_retract_layer_change",
                                             "filament_seam_gap",
                                             "filament_wipe",
+                                            "filament_wipe_extra_perimeter",
                                             "filament_wipe_speed",
                                             "filament_wipe_extra_perimeter"
                                         };
@@ -2923,11 +2925,21 @@ void TabPrinter::clear_pages()
 
 void TabPrinter::toggle_options()
 {
-    if (!m_active_page || m_presets->get_edited_preset().printer_technology() == ptSLA)
+    if (!m_active_page || m_presets->get_edited_preset().printer_technology() != ptFFF)
         return;
 
     Field* field;
 
+    const DynamicPrintConfig& print_config = m_preset_bundle->fff_prints.get_edited_preset().config;
+    const DynamicPrintConfig& filament_config = m_preset_bundle->filaments.get_edited_preset().config;
+    const DynamicPrintConfig& printer_config = m_preset_bundle->printers.get_edited_preset().config;
+
+    // Print config values
+    DynamicPrintConfig full_print_config;
+    full_print_config.apply(print_config);
+    full_print_config.apply(filament_config);
+    full_print_config.apply(printer_config);
+
     bool have_multiple_extruders = m_extruders_count > 1;
     field = get_field("toolchange_gcode");
     if (field) field->toggle(have_multiple_extruders);
@@ -3004,7 +3016,7 @@ void TabPrinter::toggle_options()
 
         // some options only apply when not using firmware retraction
         vec.resize(0);
-        vec = { "retract_speed", "deretract_speed", "retract_before_wipe", "retract_restart_extra", "wipe", "wipe_speed" };
+        vec = { "retract_speed", "deretract_speed", "retract_before_wipe", "retract_restart_extra", "wipe", "wipe_speed" , "wipe_only_crossing"};
         for (auto el : vec) {
             field = get_field(el, i);
             if (field)
@@ -3012,13 +3024,17 @@ void TabPrinter::toggle_options()
         }
 
         bool wipe = m_config->opt_bool("wipe", i) && have_retract_length;
-        vec = { "retract_before_wipe", "wipe_speed" };
+        vec = { "retract_before_wipe", "wipe_only_crossing", "wipe_speed" };
         for (auto el : vec) {
             field = get_field(el, i);
             if (field)
                 field->toggle(wipe);
         }
 
+        // wipe_only_crossing can only work if avoid_crossing_perimeters
+        if (!full_print_config.opt_bool("avoid_crossing_perimeters"))
+            get_field("wipe_only_crossing", i)->toggle(false);
+
         if (use_firmware_retraction && wipe) {
             wxMessageDialog dialog(parent(),
                 _(L("The Wipe option is not available when using the Firmware Retraction mode.\n"