Implement clone() for Fill classes

xs/MANIFEST

@@ -67,6 +67,7 @@ src/libslic3r/Geometry.hpp
 src/libslic3r/Layer.cpp
 src/libslic3r/Layer.hpp
 src/libslic3r/LayerRegion.cpp
+src/libslic3r/LayerRegionFill.cpp
 src/libslic3r/libslic3r.h
 src/libslic3r/Line.cpp
 src/libslic3r/Line.hpp

xs/src/libslic3r/Fill/Fill3DHoneycomb.hpp

@@ -12,6 +12,7 @@ namespace Slic3r {
 class Fill3DHoneycomb : public Fill
 {
 public:
+    virtual Fill* clone() const { return new Fill3DHoneycomb(*this); };
     virtual ~Fill3DHoneycomb() {}
 
 	// require bridge flow since most of this pattern hangs in air

xs/src/libslic3r/Fill/FillConcentric.hpp

@@ -11,6 +11,7 @@ public:
     virtual ~FillConcentric() {}
 
 protected:
+    virtual Fill* clone() const { return new FillConcentric(*this); };
 	virtual void _fill_surface_single(
 	    const FillParams                &params, 
 	    unsigned int                     thickness_layers,

xs/src/libslic3r/Fill/FillHoneycomb.hpp

@@ -15,6 +15,7 @@ public:
     virtual ~FillHoneycomb() {}
 
 protected:
+    virtual Fill* clone() const { return new FillHoneycomb(*this); };
 	virtual void _fill_surface_single(
 	    const FillParams                &params, 
 	    unsigned int                     thickness_layers,

xs/src/libslic3r/Fill/FillPlanePath.hpp

@@ -34,6 +34,7 @@ protected:
 class FillArchimedeanChords : public FillPlanePath
 {
 public:
+    virtual Fill* clone() const { return new FillArchimedeanChords(*this); };
     virtual ~FillArchimedeanChords() {}
 
 protected:
@@ -44,6 +45,7 @@ protected:
 class FillHilbertCurve : public FillPlanePath
 {
 public:
+    virtual Fill* clone() const { return new FillHilbertCurve(*this); };
     virtual ~FillHilbertCurve() {}
 
 protected:
@@ -54,6 +56,7 @@ protected:
 class FillOctagramSpiral : public FillPlanePath
 {
 public:
+    virtual Fill* clone() const { return new FillOctagramSpiral(*this); };
     virtual ~FillOctagramSpiral() {}
 
 protected:

xs/src/libslic3r/Fill/FillRectilinear.hpp

@@ -12,6 +12,7 @@ class Surface;
 class FillRectilinear : public Fill
 {
 public:
+    virtual Fill* clone() const { return new FillRectilinear(*this); };
     virtual ~FillRectilinear() {}
 
 protected:

xs/src/libslic3r/Fill/FillRectilinear2.hpp

@@ -12,6 +12,7 @@ class Surface;
 class FillRectilinear2 : public Fill
 {
 public:
+    virtual Fill* clone() const { return new FillRectilinear2(*this); };
     virtual ~FillRectilinear2() {}
     virtual Polylines fill_surface(const Surface *surface, const FillParams &params);
 
@@ -22,6 +23,7 @@ protected:
 class FillGrid2 : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillGrid2(*this); };
     virtual ~FillGrid2() {}
     virtual Polylines fill_surface(const Surface *surface, const FillParams &params);
 
@@ -33,6 +35,7 @@ protected:
 class FillTriangles : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillTriangles(*this); };
     virtual ~FillTriangles() {}
     virtual Polylines fill_surface(const Surface *surface, const FillParams &params);
 
@@ -44,6 +47,7 @@ protected:
 class FillStars : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillStars(*this); };
     virtual ~FillStars() {}
     virtual Polylines fill_surface(const Surface *surface, const FillParams &params);
 
@@ -55,6 +59,7 @@ protected:
 class FillCubic : public FillRectilinear2
 {
 public:
+    virtual Fill* clone() const { return new FillCubic(*this); };
     virtual ~FillCubic() {}
     virtual Polylines fill_surface(const Surface *surface, const FillParams &params);