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/MultiPoint.hpp

@@ -0,0 +1,110 @@
+#ifndef slic3r_MultiPoint_hpp_
+#define slic3r_MultiPoint_hpp_
+
+#include "libslic3r.h"
+#include <algorithm>
+#include <vector>
+#include "Line.hpp"
+#include "Point.hpp"
+
+namespace Slic3r {
+
+class BoundingBox;
+class BoundingBox3;
+
+class MultiPoint
+{
+public:
+    Points points;
+    
+    operator Points() const;
+    MultiPoint() {}
+    MultiPoint(const MultiPoint &other) : points(other.points) {}
+    MultiPoint(MultiPoint &&other) : points(std::move(other.points)) {}
+    MultiPoint(std::initializer_list<Point> list) : points(list) {}
+    explicit MultiPoint(const Points &_points) : points(_points) {}
+    MultiPoint& operator=(const MultiPoint &other) { points = other.points; return *this; }
+    MultiPoint& operator=(MultiPoint &&other) { points = std::move(other.points); return *this; }
+    void scale(double factor);
+    void translate(double x, double y);
+    void translate(const Point &vector);
+    void rotate(double angle) { this->rotate(cos(angle), sin(angle)); }
+    void rotate(double cos_angle, double sin_angle);
+    void rotate(double angle, const Point &center);
+    void reverse();
+    Point first_point() const;
+    virtual Point last_point() const = 0;
+    virtual Lines lines() const = 0;
+    size_t size() const { return points.size(); }
+    bool   empty() const { return points.empty(); }
+    double length() const;
+    bool   is_valid() const { return this->points.size() >= 2; }
+
+    int  find_point(const Point &point) const;
+    bool has_boundary_point(const Point &point) const;
+    int  closest_point_index(const Point &point) const {
+        int idx = -1;
+        if (! this->points.empty()) {
+            idx = 0;
+            double dist_min = (point - this->points.front()).cast<double>().norm();
+            for (int i = 1; i < int(this->points.size()); ++ i) {
+                double d = (this->points[i] - point).cast<double>().norm();
+                if (d < dist_min) {
+                    dist_min = d;
+                    idx = i;
+                }
+            }
+        }
+        return idx;
+    }
+    const Point* closest_point(const Point &point) const { return this->points.empty() ? nullptr : &this->points[this->closest_point_index(point)]; }
+    BoundingBox bounding_box() const;
+    // Return true if there are exact duplicates.
+    bool has_duplicate_points() const;
+    // Remove exact duplicates, return true if any duplicate has been removed.
+    bool remove_duplicate_points();
+    void append(const Point &point) { this->points.push_back(point); }
+    void append(const Points &src) { this->append(src.begin(), src.end()); }
+    void append(const Points::const_iterator &begin, const Points::const_iterator &end) { this->points.insert(this->points.end(), begin, end); }
+    void append(Points &&src)
+    {
+        if (this->points.empty()) {
+            this->points = std::move(src);
+        } else {
+            this->points.insert(this->points.end(), src.begin(), src.end());
+            src.clear();
+        }
+    }
+
+    bool intersection(const Line& line, Point* intersection) const;
+    bool first_intersection(const Line& line, Point* intersection) const;
+    
+    static Points _douglas_peucker(const Points &points, const double tolerance);
+};
+
+class MultiPoint3
+{
+public:
+    Points3 points;
+
+    void append(const Vec3crd& point) { this->points.push_back(point); }
+
+    void translate(double x, double y);
+    void translate(const Point& vector);
+    virtual Lines3 lines() const = 0;
+    double length() const;
+    bool is_valid() const { return this->points.size() >= 2; }
+
+    BoundingBox3 bounding_box() const;
+
+    // Remove exact duplicates, return true if any duplicate has been removed.
+    bool remove_duplicate_points();
+};
+
+extern BoundingBox get_extents(const MultiPoint &mp);
+extern BoundingBox get_extents_rotated(const std::vector<Point> &points, double angle);
+extern BoundingBox get_extents_rotated(const MultiPoint &mp, double angle);
+
+} // namespace Slic3r
+
+#endif