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src/libslic3r/ShortestPath.hpp

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+#ifndef slic3r_ShortestPath_hpp_
+#define slic3r_ShortestPath_hpp_
+
+#include "libslic3r.h"
+#include "ExtrusionEntity.hpp"
+#include "Point.hpp"
+
+#include <utility>
+#include <vector>
+
+namespace ClipperLib { class PolyNode; }
+
+namespace Slic3r {
+
+std::vector<size_t> 				 chain_points(const Points &points, Point *start_near = nullptr);
+std::vector<size_t> 				 chain_expolygons(const ExPolygons &input_exploy);
+
+std::vector<std::pair<size_t, bool>> chain_extrusion_entities(std::vector<ExtrusionEntity*> &entities, const Point *start_near = nullptr);
+void                                 reorder_extrusion_entities(std::vector<ExtrusionEntity*> &entities, const std::vector<std::pair<size_t, bool>> &chain);
+void                                 chain_and_reorder_extrusion_entities(std::vector<ExtrusionEntity*> &entities, const Point *start_near = nullptr);
+
+std::vector<std::pair<size_t, bool>> chain_extrusion_paths(std::vector<ExtrusionPath> &extrusion_paths, const Point *start_near = nullptr);
+void                                 reorder_extrusion_paths(std::vector<ExtrusionPath> &extrusion_paths, std::vector<std::pair<size_t, bool>> &chain);
+void                                 chain_and_reorder_extrusion_paths(std::vector<ExtrusionPath> &extrusion_paths, const Point *start_near = nullptr);
+
+Polylines 							 chain_polylines(Polylines &&src, const Point *start_near = nullptr);
+inline Polylines 					 chain_polylines(const Polylines& src, const Point* start_near = nullptr) { Polylines tmp(src); return chain_polylines(std::move(tmp), start_near); }
+template<typename T> inline void reorder_by_shortest_traverse(std::vector<T> &polylines_out)
+{
+    Points start_point;
+    start_point.reserve(polylines_out.size());
+    for (const T contour : polylines_out) start_point.push_back(contour.points.front());
+
+    std::vector<Points::size_type> order = chain_points(start_point);
+
+    std::vector<T> Temp = polylines_out;
+    polylines_out.erase(polylines_out.begin(), polylines_out.end());
+
+    for (size_t i:order) polylines_out.emplace_back(std::move(Temp[i]));
+}
+
+std::vector<ClipperLib::PolyNode*>	 chain_clipper_polynodes(const Points &points, const std::vector<ClipperLib::PolyNode*> &items);
+
+// Chain instances of print objects by an approximate shortest path.
+// Returns pairs of PrintObject idx and instance of that PrintObject.
+class Print;
+struct PrintInstance;
+// QDS
+class PrintObject;
+std::vector<const PrintInstance*> chain_print_object_instances(const std::vector<const PrintObject*>& print_objects, const Point* start_near);
+std::vector<const PrintInstance*> 	 chain_print_object_instances(const Print &print);
+
+// Chain lines into polylines.
+Polylines 							 chain_lines(const std::vector<Line> &lines, const double point_distance_epsilon);
+
+} // namespace Slic3r
+
+#endif /* slic3r_ShortestPath_hpp_ */