Gyroid infill type (#733)

Gyroid infill type.

xs/src/libslic3r/Fill/FillGyroid.hpp

@@ -0,0 +1,55 @@
+#ifndef slic3r_FillGyroid_hpp_
+#define slic3r_FillGyroid_hpp_
+
+#include <map>
+
+#include "../libslic3r.h"
+
+#include "FillBase.hpp"
+
+namespace Slic3r {
+
+class FillGyroid : public Fill
+{
+public:
+
+    FillGyroid(){ scaling = 1.75; }
+    virtual Fill* clone() const { return new FillGyroid(*this); };
+    virtual ~FillGyroid() {}
+
+    // require bridge flow since most of this pattern hangs in air
+    virtual bool use_bridge_flow() const { return true; }
+
+protected:
+    
+    // mult of density, to have a good %of weight for each density parameter
+    float scaling;
+
+
+    virtual void _fill_surface_single(
+        const FillParams                &params, 
+        unsigned int                     thickness_layers,
+        const std::pair<float, Point>   &direction, 
+        ExPolygon                       &expolygon, 
+        Polylines                       &polylines_out);
+    
+    // create the gyroid grid to clip.
+    Polylines makeGrid(coord_t gridZ, double density, double layer_width, size_t gridWidth, size_t gridHeight, size_t curveType);
+    //add line poly in reverse if needed into array
+    inline void correctOrderAndAdd(const int num, Polyline &poly, Polylines &array);
+    //create a curved horinzontal line  (for each x, compute y)
+    Polyline makeLineHori(double xPos, double yPos, double width, double height, 
+        double currentYBegin, double segmentSize, coord_t scaleFactor, 
+        double zCs, double zSn, 
+        bool flip, double decal=0);
+    //create a curved vertival line (for each y, compute x)
+    Polyline makeLineVert(double xPos, double yPos, double width, double height, 
+        double currentXBegin, double segmentSize, coord_t scaleFactor, 
+        double zCs, double zSn, 
+        bool flip, double decal=0);
+
+};
+
+} // namespace Slic3r
+
+#endif // slic3r_FillGyroid_hpp_