WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/libslic3r/Fill/FillPlanePath.hpp

@@ -0,0 +1,69 @@
+#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 Fill
+{
+public:
+    virtual ~FillPlanePath() {}
+
+protected:
+    virtual void _fill_surface_single(
+        const FillParams                &params, 
+        unsigned int                     thickness_layers,
+        const std::pair<float, Point>   &direction, 
+        ExPolygon                       &expolygon, 
+        Polylines                       &polylines_out);
+
+    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 Fill* clone() const { return new FillArchimedeanChords(*this); };
+    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 Fill* clone() const { return new FillHilbertCurve(*this); };
+    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 Fill* clone() const { return new FillOctagramSpiral(*this); };
+    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_