BedShapeDialog and Bed_2D (as a part of it) are completed.

Added new_scale function to Polyline.
Fixed small bug in PointCtrl.
Extended change_opt_value for coPoints case.

xs/src/libslic3r/Polyline.hpp

@@ -21,6 +21,14 @@ public:
     Polyline(Polyline &&other) : MultiPoint(std::move(other.points)) {}
     Polyline& operator=(const Polyline &other) { points = other.points; return *this; }
     Polyline& operator=(Polyline &&other) { points = std::move(other.points); return *this; }
+	static Polyline new_scale(std::vector<Pointf> points) {
+		Polyline pl;
+		Points int_points;
+		for (auto pt : points)
+			int_points.push_back(Point::new_scale(pt.x, pt.y));
+		pl.append(int_points);
+		return pl;
+    }
     
     void append(const Point &point) { this->points.push_back(point); }
     void append(const Points &src) { this->append(src.begin(), src.end()); }