Fills were reimplemented in C++.

While reimplementing the FillPlanePath code, the octagon infill was fixed to extrude the right amount of material.

xs/src/libslic3r/Fill/FillPlanePath.hpp

@@ -0,0 +1,60 @@
+#ifndef slic3r_FillPlanePath_hpp_
+#define slic3r_FillPlanePath_hpp_
+
+#include <map>
+
+#include "../libslic3r.h"
+
+#include "FillBase.hpp"
+
+namespace Slic3r {
+
+// The original Perl code used path generators from Math::PlanePath library:
+// http://user42.tuxfamily.org/math-planepath/
+// http://user42.tuxfamily.org/math-planepath/gallery.html
+
+class FillPlanePath : public FillWithDirection
+{
+public:
+    virtual ~FillPlanePath() {}
+    virtual Polylines fill_surface(const Surface *surface, const FillParams &params);
+
+protected:
+    virtual float _layer_angle(size_t idx) const { return 0.f; }
+    virtual bool  _centered() const = 0;
+    virtual Pointfs _generate(coord_t min_x, coord_t min_y, coord_t max_x, coord_t max_y) = 0;
+};
+
+class FillArchimedeanChords : public FillPlanePath
+{
+public:
+    virtual ~FillArchimedeanChords() {}
+
+protected:
+    virtual bool  _centered() const { return true; }
+    virtual Pointfs _generate(coord_t min_x, coord_t min_y, coord_t max_x, coord_t max_y);
+};
+
+class FillHilbertCurve : public FillPlanePath
+{
+public:
+    virtual ~FillHilbertCurve() {}
+
+protected:
+    virtual bool  _centered() const { return false; }
+    virtual Pointfs _generate(coord_t min_x, coord_t min_y, coord_t max_x, coord_t max_y);
+};
+
+class FillOctagramSpiral : public FillPlanePath
+{
+public:
+    virtual ~FillOctagramSpiral() {}
+
+protected:
+    virtual bool  _centered() const { return true; }
+    virtual Pointfs _generate(coord_t min_x, coord_t min_y, coord_t max_x, coord_t max_y);
+};
+
+} // namespace Slic3r
+
+#endif // slic3r_FillPlanePath_hpp_