Fix of #6832, SPE-1956: total toolchanges not counted correctly when …

…wipe tower is disabled

src/libslic3r/GCode.cpp

@@ -720,14 +720,15 @@ namespace DoExport {
         const FullPrintConfig        &config,
         const std::vector<Extruder>  &extruders,
         unsigned int                 initial_extruder_id,
+        int                          total_toolchanges,
         PrintStatistics              &print_statistics,
         bool                         export_binary_data,
         bgcode::binarize::BinaryData &binary_data)
     {
         std::string filament_stats_string_out;
 
         print_statistics.clear();
-        print_statistics.total_toolchanges = std::max(0, wipe_tower_data.number_of_toolchanges);
+        print_statistics.total_toolchanges = total_toolchanges;
         print_statistics.initial_extruder_id = initial_extruder_id;
         std::vector<std::string> filament_types;
         if (! extruders.empty()) {
@@ -1161,7 +1162,7 @@ void GCodeGenerator::_do_export(Print& print, GCodeOutputStream &file, Thumbnail
     // For the start / end G-code to do the priming and final filament pull in case there is no wipe tower provided.
     this->placeholder_parser().set("has_wipe_tower", has_wipe_tower);
     this->placeholder_parser().set("has_single_extruder_multi_material_priming", has_wipe_tower && print.config().single_extruder_multi_material_priming);
-    this->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).
+    this->placeholder_parser().set("total_toolchanges", tool_ordering.toolchanges_count());
     {
         BoundingBoxf bbox(print.config().bed_shape.values);
         assert(bbox.defined);
@@ -1389,6 +1390,7 @@ void GCodeGenerator::_do_export(Print& print, GCodeOutputStream &file, Thumbnail
         this->config(),
         m_writer.extruders(),
         initial_extruder_id,
+        tool_ordering.toolchanges_count(),
         // Modifies
         print.m_print_statistics,
         export_to_binary_gcode,

src/libslic3r/GCode/ToolOrdering.cpp

@@ -836,4 +836,20 @@ void WipingExtrusions::ensure_perimeters_infills_order(const Print& print, const
     }
 }
 
+
+int ToolOrdering::toolchanges_count() const
+{
+    std::vector<unsigned int> tools_in_order;
+    for (const LayerTools& lt : m_layer_tools)
+        tools_in_order.insert(tools_in_order.end(), lt.extruders.begin(), lt.extruders.end());
+    assert(std::find(tools_in_order.begin(), tools_in_order.end(), (unsigned int)(-1)) == tools_in_order.end());
+    for (size_t i=1; i<tools_in_order.size(); ++i)
+        if (tools_in_order[i] == tools_in_order[i-1])
+            tools_in_order[i-1] = (unsigned int)(-1);
+    tools_in_order.erase(std::remove(tools_in_order.begin(), tools_in_order.end(), (unsigned int)(-1)), tools_in_order.end());
+    if (tools_in_order.size() > 1 && tools_in_order.back() == tools_in_order[tools_in_order.size()-2])
+        tools_in_order.pop_back();
+    return std::max(0, int(tools_in_order.size())-1); // 5 tools = 4 toolchanges
+}
+
 } // namespace Slic3r

src/libslic3r/GCode/ToolOrdering.hpp

@@ -165,6 +165,7 @@ class ToolOrdering
     bool 				empty()       const { return m_layer_tools.empty(); }
     std::vector<LayerTools>& layer_tools() { return m_layer_tools; }
     bool 				has_wipe_tower() const { return ! m_layer_tools.empty() && m_first_printing_extruder != (unsigned int)-1 && m_layer_tools.front().wipe_tower_partitions > 0; }
+    int                 toolchanges_count() const;
 
 private:
     void				initialize_layers(std::vector<coordf_t> &zs);

src/slic3r/GUI/Plater.cpp

@@ -1502,8 +1502,7 @@ void Sidebar::update_sliced_info_sizer()
                 p->sliced_info->SetTextAndShow(siEstimatedTime, info_text, new_label);
             }
 
-            // if there is a wipe tower, insert number of toolchanges info into the array:
-            p->sliced_info->SetTextAndShow(siWTNumbetOfToolchanges, is_wipe_tower ? wxString::Format("%.d", ps.total_toolchanges) : "N/A");
+            p->sliced_info->SetTextAndShow(siWTNumbetOfToolchanges, ps.total_toolchanges > 0 ? wxString::Format("%.d", ps.total_toolchanges) : "N/A");
 
             // Hide non-FFF sliced info parameters
             p->sliced_info->SetTextAndShow(siMateril_unit, "N/A");