Add the misisng interface file

Three/include/CGAL/Three/Scene_print_item_interface.h

@@ -0,0 +1,52 @@
+// Copyright (c) 2009,2010,2012,2015  GeometryFactory Sarl (France)
+// All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org).
+// You can redistribute it and/or modify it under the terms of the GNU
+// General Public License as published by the Free Software Foundation,
+// either version 3 of the License, or (at your option) any later version.
+//
+// Licensees holding a valid commercial license may use this file in
+// accordance with the commercial license agreement provided with the software.
+//
+// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+// $URL$
+// $Id$
+//
+// Author(s)     : Maxime GIMENO
+
+#ifndef SCENE_PRINT_ITEM_INTERFACE_H
+#define SCENE_PRINT_ITEM_INTERFACE_H
+
+#include <CGAL/license/Three.h>
+#include <QtPlugin>
+#include <QPoint>
+namespace CGAL
+{
+namespace Three {
+  class Viewer_interface;
+
+
+//! An item that wants to print its primitive IDs must derive from this interface.
+class Scene_print_item_interface {
+public:
+  virtual ~Scene_print_item_interface(){}
+ //! Finds the spot the closest to `point` and prints the id of the corresponding Primitive (vertex, edge or face).
+ virtual void printPrimitiveId(QPoint, CGAL::Three::Viewer_interface*) = 0;
+  //! Prints all the primitive ids if their number is not too high. The limit is
+  //! editable in the View menu of the application.
+ virtual void printPrimitiveIds(CGAL::Three::Viewer_interface*)const = 0;
+  //! \brief Tests if an id should be displayed or not.
+  //!
+  //! \returns true if the Id should be displayed
+  //! \returns false if the Id should not be displayed (if it is hidden for example)
+  virtual bool testDisplayId(double, double, double, CGAL::Three::Viewer_interface*)const = 0;
+};
+}
+}
+
+Q_DECLARE_INTERFACE(CGAL::Three::Scene_print_item_interface, "com.geometryfactory.PolyhedronDemo.PrintInterface/1.0")
+#endif // SCENE_PRINT_ITEM_INTERFACE_H
+