Initial work for 3D rendering of toolpaths

xs/src/libslic3r/ExtrusionEntity.cpp

@@ -164,6 +164,14 @@ ExtrusionPath::gcode(Extruder* extruder, double e, double F,
     return stream.str();
 }
 
+Polygons
+ExtrusionPath::grow() const
+{
+    Polygons pp;
+    offset(this->polyline, &pp, +this->width/2);
+    return pp;
+}
+
 ExtrusionLoop::operator Polygon() const
 {
     Polygon polygon;
@@ -363,6 +371,17 @@ ExtrusionLoop::is_solid_infill() const
         || this->paths.front().role == erTopSolidInfill;
 }
 
+Polygons
+ExtrusionLoop::grow() const
+{
+    Polygons pp;
+    for (ExtrusionPaths::const_iterator path = this->paths.begin(); path != this->paths.end(); ++path) {
+        Polygons path_pp = path->grow();
+        pp.insert(pp.end(), path_pp.begin(), path_pp.end());
+    }
+    return pp;
+}
+
 #ifdef SLIC3RXS
 REGISTER_CLASS(ExtrusionLoop, "ExtrusionLoop");
 #endif

xs/src/libslic3r/ExtrusionEntity.hpp

@@ -43,6 +43,7 @@ class ExtrusionEntity
     virtual void reverse() = 0;
     virtual Point first_point() const = 0;
     virtual Point last_point() const = 0;
+    virtual Polygons grow() const = 0;
 };
 
 typedef std::vector<ExtrusionEntity*> ExtrusionEntitiesPtr;
@@ -73,6 +74,7 @@ class ExtrusionPath : public ExtrusionEntity
     std::string gcode(Extruder* extruder, double e, double F,
         double xofs, double yofs, std::string extrusion_axis,
         std::string gcode_line_suffix) const;
+    Polygons grow() const;
 
     private:
     void _inflate_collection(const Polylines &polylines, ExtrusionEntityCollection* collection) const;
@@ -106,6 +108,7 @@ class ExtrusionLoop : public ExtrusionEntity
     bool is_perimeter() const;
     bool is_infill() const;
     bool is_solid_infill() const;
+    Polygons grow() const;
 };
 
 }

xs/src/libslic3r/ExtrusionEntityCollection.cpp

@@ -110,6 +110,17 @@ ExtrusionEntityCollection::chained_path_from(Point start_near, ExtrusionEntityCo
     }
 }
 
+Polygons
+ExtrusionEntityCollection::grow() const
+{
+    Polygons pp;
+    for (ExtrusionEntitiesPtr::const_iterator it = this->entities.begin(); it != this->entities.end(); ++it) {
+        Polygons entity_pp = (*it)->grow();
+        pp.insert(pp.end(), entity_pp.begin(), entity_pp.end());
+    }
+    return pp;
+}
+
 #ifdef SLIC3RXS
 // there is no ExtrusionLoop::Collection or ExtrusionEntity::Collection
 REGISTER_CLASS(ExtrusionEntityCollection, "ExtrusionPath::Collection");

xs/src/libslic3r/ExtrusionEntityCollection.hpp

@@ -22,6 +22,7 @@ class ExtrusionEntityCollection : public ExtrusionEntity
     void reverse();
     Point first_point() const;
     Point last_point() const;
+    Polygons grow() const;
 };
 
 }

xs/src/libslic3r/Line.cpp

@@ -201,6 +201,13 @@ Linef3::intersect_plane(double z) const
     );
 }
 
+void
+Linef3::scale(double factor)
+{
+    this->a.scale(factor);
+    this->b.scale(factor);
+}
+
 #ifdef SLIC3RXS
 REGISTER_CLASS(Linef3, "Linef3");
 #endif

xs/src/libslic3r/Line.hpp

@@ -55,6 +55,7 @@ class Linef3
     Linef3() {};
     explicit Linef3(Pointf3 _a, Pointf3 _b): a(_a), b(_b) {};
     Pointf3 intersect_plane(double z) const;
+    void scale(double factor);
     
     #ifdef SLIC3RXS
     void from_SV(SV* line_sv);