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/Line.hpp

@@ -0,0 +1,119 @@
+#ifndef slic3r_Line_hpp_
+#define slic3r_Line_hpp_
+
+#include "libslic3r.h"
+#include "Point.hpp"
+
+namespace Slic3r {
+
+class Line;
+class Line3;
+class Linef3;
+class Polyline;
+class ThickLine;
+typedef std::vector<Line> Lines;
+typedef std::vector<Line3> Lines3;
+typedef std::vector<ThickLine> ThickLines;
+
+Linef3 transform(const Linef3& line, const Transform3d& t);
+
+class Line
+{
+public:
+    Line() {}
+    Line(const Point& _a, const Point& _b) : a(_a), b(_b) {}
+    explicit operator Lines() const { Lines lines; lines.emplace_back(*this); return lines; }
+    void   scale(double factor) { this->a *= factor; this->b *= factor; }
+    void   translate(double x, double y) { Vector v(x, y); this->a += v; this->b += v; }
+    void   rotate(double angle, const Point &center) { this->a.rotate(angle, center); this->b.rotate(angle, center); }
+    void   reverse() { std::swap(this->a, this->b); }
+    double length() const { return (b - a).cast<double>().norm(); }
+    Point  midpoint() const { return (this->a + this->b) / 2; }
+    bool   intersection_infinite(const Line &other, Point* point) const;
+    bool   operator==(const Line &rhs) const { return this->a == rhs.a && this->b == rhs.b; }
+    double distance_to(const Point &point) const;
+    double perp_distance_to(const Point &point) const;
+    bool   parallel_to(double angle) const;
+    bool   parallel_to(const Line &line) const { return this->parallel_to(line.direction()); }
+    double atan2_() const { return atan2(this->b(1) - this->a(1), this->b(0) - this->a(0)); }
+    double orientation() const;
+    double direction() const;
+    Vector vector() const { return this->b - this->a; }
+    Vector normal() const { return Vector((this->b(1) - this->a(1)), -(this->b(0) - this->a(0))); }
+    bool   intersection(const Line& line, Point* intersection) const;
+    double ccw(const Point& point) const { return point.ccw(*this); }
+
+    Point a;
+    Point b;
+};
+
+class ThickLine : public Line
+{
+public:
+    ThickLine() : a_width(0), b_width(0) {}
+    ThickLine(const Point& a, const Point& b) : Line(a, b), a_width(0), b_width(0) {}
+    ThickLine(const Point& a, const Point& b, double wa, double wb) : Line(a, b), a_width(wa), b_width(wb) {}
+
+    double a_width, b_width;
+};
+
+class Line3
+{
+public:
+    Line3() : a(Vec3crd::Zero()), b(Vec3crd::Zero()) {}
+    Line3(const Vec3crd& _a, const Vec3crd& _b) : a(_a), b(_b) {}
+
+    double  length() const { return (this->a - this->b).cast<double>().norm(); }
+    Vec3crd vector() const { return this->b - this->a; }
+
+    Vec3crd a;
+    Vec3crd b;
+};
+
+class Linef
+{
+public:
+    Linef() : a(Vec2d::Zero()), b(Vec2d::Zero()) {}
+    Linef(const Vec2d& _a, const Vec2d& _b) : a(_a), b(_b) {}
+
+    Vec2d a;
+    Vec2d b;
+};
+
+class Linef3
+{
+public:
+    Linef3() : a(Vec3d::Zero()), b(Vec3d::Zero()) {}
+    Linef3(const Vec3d& _a, const Vec3d& _b) : a(_a), b(_b) {}
+
+    Vec3d   intersect_plane(double z) const;
+    void    scale(double factor) { this->a *= factor; this->b *= factor; }
+    Vec3d   vector() const { return this->b - this->a; }
+    Vec3d   unit_vector() const { return (length() == 0.0) ? Vec3d::Zero() : vector().normalized(); }
+    double  length() const { return vector().norm(); }
+
+    Vec3d a;
+    Vec3d b;
+};
+
+} // namespace Slic3r
+
+// start Boost
+#include <boost/polygon/polygon.hpp>
+namespace boost { namespace polygon {
+    template <>
+    struct geometry_concept<Slic3r::Line> { typedef segment_concept type; };
+
+    template <>
+    struct segment_traits<Slic3r::Line> {
+        typedef coord_t coordinate_type;
+        typedef Slic3r::Point point_type;
+    
+        static inline point_type get(const Slic3r::Line& line, direction_1d dir) {
+            return dir.to_int() ? line.b : line.a;
+        }
+    };
+} }
+// end Boost
+
+#endif