Merge with bibnikv.

Added some functions to TabIface.
Added BedShapeDialog & Bed2D classes.
Added new_scale to Polygon.
In class Field: Point renamed to PointCtrl and added set_value for PointCtrl, extended get_value for Choice.

xs/src/slic3r/GUI/BedShapeDialog.hpp

@@ -0,0 +1,50 @@
+// The bed shape dialog.
+// The dialog opens from Print Settins tab->Bed Shape : Set...
+
+#include "OptionsGroup.hpp"
+#include "2DBed.hpp"
+
+
+#include <wx/dialog.h>
+#include <wx/choicebk.h>
+
+namespace Slic3r {
+namespace GUI {
+
+using ConfigOptionsGroupShp = std::shared_ptr<ConfigOptionsGroup>;
+class BedShapePanel : public wxPanel
+{
+	wxChoicebook*	m_shape_options_book;
+	Bed_2D*			m_canvas;
+
+	std::vector <ConfigOptionsGroupShp>	m_optgroups;
+
+public:
+	BedShapePanel(wxWindow* parent) : wxPanel(parent, wxID_ANY){}
+	~BedShapePanel(){}
+
+	void		build_panel(ConfigOptionPoints* default_pt);
+
+	// Returns the resulting bed shape polygon. This value will be stored to the ini file.
+	int			GetValue() { return 1/*m_canvas->bed_shape*/; }
+	ConfigOptionsGroupShp	init_shape_options_page(std::string title);
+	void		set_shape(ConfigOptionPoints* points);
+	void		update_preview();
+	void		update_shape();
+	void		load_stl();
+};
+
+class BedShapeDialog : public wxDialog
+{
+	BedShapePanel* m_panel;
+public:
+	BedShapeDialog(wxWindow* parent) : wxDialog(parent, wxID_ANY, "Bed Shape",
+		wxDefaultPosition, wxSize(350, 700), wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER){}
+	~BedShapeDialog(){}
+
+	void		build_dialog(ConfigOptionPoints* default_pt);
+	int			GetValue() { return m_panel->GetValue(); }
+};
+
+} // GUI
+} // Slic3r