Moved C++ code into new libslic3r directory

xs/src/libslic3r/Line.hpp

@@ -0,0 +1,68 @@
+#ifndef slic3r_Line_hpp_
+#define slic3r_Line_hpp_
+
+#include <myinit.h>
+#include "Point.hpp"
+
+namespace Slic3r {
+
+class Line;
+class Polyline;
+
+class Line
+{
+    public:
+    Point a;
+    Point b;
+    Line() {};
+    explicit Line(Point _a, Point _b): a(_a), b(_b) {};
+    std::string wkt() const;
+    operator Polyline() const;
+    void scale(double factor);
+    void translate(double x, double y);
+    void rotate(double angle, const Point &center);
+    void reverse();
+    double length() const;
+    Point* midpoint() const;
+    void point_at(double distance, Point* point) const;
+    Point point_at(double distance) const;
+    bool coincides_with(const Line &line) const;
+    double distance_to(const Point &point) const;
+    bool parallel_to(double angle) const;
+    bool parallel_to(const Line &line) const;
+    double atan2_() const;
+    double orientation() const;
+    double direction() const;
+    Vector vector() const;
+    
+    #ifdef SLIC3RXS
+    void from_SV(SV* line_sv);
+    void from_SV_check(SV* line_sv);
+    SV* to_AV();
+    SV* to_SV_pureperl() const;
+    #endif
+};
+
+typedef std::vector<Line> Lines;
+
+}
+
+// start Boost
+#include <boost/polygon/polygon.hpp>
+namespace boost { namespace polygon {
+    template <>
+    struct geometry_concept<Line> { typedef segment_concept type; };
+
+    template <>
+    struct segment_traits<Line> {
+        typedef coord_t coordinate_type;
+        typedef Point point_type;
+    
+        static inline point_type get(const Line& line, direction_1d dir) {
+            return dir.to_int() ? line.b : line.a;
+        }
+    };
+} }
+// end Boost
+
+#endif