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src/libslic3r/ArcFitter.hpp

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+#ifndef slic3r_ArcFitter_hpp_
+#define slic3r_ArcFitter_hpp_
+
+#include "Circle.hpp"
+
+namespace Slic3r {
+
+//QDS: linear move(G0 and G1) or arc move(G2 and G3).
+enum class EMovePathType : unsigned char
+{
+    Noop_move,
+    Linear_move,
+    Arc_move_cw,
+    Arc_move_ccw,
+    Count
+};
+
+//QDS
+struct PathFittingData{
+    size_t start_point_index;
+    size_t end_point_index;
+    EMovePathType path_type;
+    // QDS: only valid when path_type is arc move
+    // Used to store detail information of arc segment
+    ArcSegment arc_data;
+
+    bool is_linear_move() {
+        return (path_type == EMovePathType::Linear_move);
+    }
+    bool is_arc_move() {
+        return (path_type == EMovePathType::Arc_move_ccw || path_type == EMovePathType::Arc_move_cw);
+    }
+    bool reverse_arc_path() {
+        if (!is_arc_move() || !arc_data.reverse())
+            return false;
+        path_type = (arc_data.direction == ArcDirection::Arc_Dir_CCW) ? EMovePathType::Arc_move_ccw : EMovePathType::Arc_move_cw;
+        return true;
+    }
+};
+
+class ArcFitter {
+public:
+    //QDS: this function is used to check the point list and return which part can fit as arc, which part should be line
+    static void do_arc_fitting(const Points& points, std::vector<PathFittingData> &result, double tolerance);
+    //QDS: this function is used to check the point list and return which part can fit as arc, which part should be line.
+    //By the way, it also use DP simplify to reduce point of straight part and only keep the start and end point of arc.
+    static void do_arc_fitting_and_simplify(Points& points, std::vector<PathFittingData>& result, double tolerance);
+};
+
+}
+
+
+#endif