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diff --git a/GudhUI/view/Viewer.h b/GudhUI/view/Viewer.h
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+/* This file is part of the Gudhi Library. The Gudhi library 
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++ 
+ *    library for computational topology.
+ *
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014  INRIA Sophia Antipolis-Mediterranee (France)
+ *
+ *    This program is free software: 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.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#ifndef VIEW_VIEWER_H_
+#define VIEW_VIEWER_H_
+
+// Workaround for moc-qt4 not parsing boost headers
+#include <CGAL/config.h>
+
+#include <QGLViewer/qglviewer.h>
+
+#include <vector>
+
+#include "View_parameter.h"
+#include "model/Complex_typedefs.h"
+#include "Color.h"
+#include "Viewer_instructor.h"
+
+class Viewer_instructor;
+
+class Viewer : public QGLViewer {
+  Q_OBJECT
+
+  Viewer_instructor * instructor;
+
+  /**
+   * light angles
+   */
+  double theta, phi;
+  typedef Complex::GT Gudhi_kernel;
+  typedef Gudhi_kernel::Point_3 Point_3;
+
+ public:
+  Viewer(QWidget* parent);
+
+  void set_instructor(Viewer_instructor* instructor_);
+
+  void show_entire_scene();
+
+  void draw();
+
+  void set_bounding_box(const Point_3 & lower_left, const Point_3 & upper_right);
+
+  void update_GL();
+
+  void init_scene();
+
+  void init_light();
+
+  void set_light();
+
+  void set_light_direction(double theta, double phi);
+
+  /**
+   * set the light in the direction of the observer
+   */
+  void set_light_direction();
+
+ protected:
+  virtual void postSelection(const QPoint& point);
+
+ public:
+  ////////////////////////
+  // draw
+  ////////////////////////
+  void set_size_point(double size_points);
+
+  void set_color(const Color& color);
+
+  void draw_point(const Point_3& p, const Color& color, double size_points);
+
+  void begin_draw_points(double size, bool light = false);
+
+  void draw_points(const Point_3 & point);
+
+  void end_draw_points();
+
+  void draw_edge(const Point_3 &a, const Point_3 &b, const Color& color, double size);
+
+  void begin_draw_edges(double size, bool light = false);
+
+  void draw_edges(const Point_3 &a, const Point_3 &b);
+
+  void end_draw_edges();
+
+  void begin_draw_triangles(double size, bool light, bool transparent = false);
+
+  void draw_triangles(const Point_3& p1, const Point_3& p2, const Point_3& p3);
+
+  // todo remove
+  void draw_triangles(const std::vector<Point_3*>& points);
+
+  void end_draw_triangles();
+
+
+ signals:
+  void click(const Point_3& position);
+};
+
+#endif  // VIEW_VIEWER_H_