/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
 *      Copyright (C) 2001-2003 by Computer Graphics Group, RWTH Aachen      *
 *                           www.openmesh.org                                *
 *                                                                           *
 *---------------------------------------------------------------------------* 
 *                                                                           *
 *                                License                                    *
 *                                                                           *
 *  This library is free software; you can redistribute it and/or modify it  *
 *  under the terms of the GNU Lesser General Public License as published    *
 *  by the Free Software Foundation, version 2.1.                            *
 *                                                                           *
 *  This library 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        *
 *  Lesser General Public License for more details.                          *
 *                                                                           *
 *  You should have received a copy of the GNU Lesser General Public         *
 *  License along with this library; if not, write to the Free Software      *
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
 *                                                                           *
\*===========================================================================*/

//=============================================================================
//
//  CLASS newClass
//
//=============================================================================


#ifndef OPENMESH_VDPROGMESH_VDPMSYNTHESIZERVIEWERWIDGET_HH
#define OPENMESH_VDPROGMESH_VDPMSYNTHESIZERVIEWERWIDGET_HH


//== INCLUDES =================================================================

#include <string>
#include <QTimer>

#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>
#include <OpenMesh/Apps/QtViewer/MeshViewerWidgetT.hh>

#include <OpenMesh/Tools/VDPM/MeshTraits.hh>
#include <OpenMesh/Tools/VDPM/StreamingDef.hh>
#include <OpenMesh/Tools/VDPM/ViewingParameters.hh>
#include <OpenMesh/Tools/VDPM/VHierarchy.hh>
#include <OpenMesh/Tools/VDPM/VFront.hh>


//== FORWARDDECLARATIONS ======================================================


//== NAMESPACES ===============================================================

namespace OpenMesh {


//== CLASS DEFINITION =========================================================

	      
/** \class newClass newClass.hh <OpenMesh/.../newClass.hh>

    Brief Description.
  
    A more elaborate description follows.
*/



typedef TriMesh_ArrayKernelT<VDPM::MeshTraits>	VDPMMesh;
typedef MeshViewerWidgetT<VDPMMesh>		MeshViewerWidget;


  // using view dependent progressive mesh 

  using VDPM::Plane3d;
  using VDPM::VFront;
  using VDPM::VHierarchy;
  using VDPM::VHierarchyNode;
  using VDPM::VHierarchyNodeIndex;
  using VDPM::VHierarchyNodeHandle;
  using VDPM::VHierarchyNodeHandleContainer;
  using VDPM::ViewingParameters;


//== CLASS DEFINITION =========================================================


class VDPMSynthesizerViewerWidget : public MeshViewerWidget
{
public:

  typedef MeshViewerWidget Base;

public:

  VDPMSynthesizerViewerWidget(QWidget* _parent=0, const char* _name=0)
    : MeshViewerWidget(_parent)
  {
    adaptive_mode_ = false;
  }

  ~VDPMSynthesizerViewerWidget()
  {

  }

  /// open view-dependent progressive mesh
  void open_vd_prog_mesh(const char* _filename);


private:

  QString             qFilename_;
  VHierarchy          vhierarchy_;
  VFront              vfront_;
  ViewingParameters   viewing_parameters_;
  float               kappa_square_;
  bool                adaptive_mode_;

  unsigned int        n_base_vertices_;
  unsigned int        n_base_edges_;
  unsigned int        n_base_faces_;
  unsigned int        n_details_;

    
private:

  bool outside_view_frustum(const OpenMesh::Vec3f &pos, float radius);

  bool oriented_away(float sin_square, 
		     float distance_square, 
		     float product_value);

  bool screen_space_error(float mue_square, 
			  float sigma_square, 
			  float distance_square, 
			  float product_value);

  void update_viewing_parameters();

  virtual void keyPressEvent(QKeyEvent* _event);

protected:

  /// inherited drawing method
  virtual void draw_scene(const std::string& _draw_mode);

public:

  void adaptive_refinement();	

  bool qrefine(VHierarchyNodeHandle _node_handle);		

  void force_vsplit(VHierarchyNodeHandle _node_handle);

  bool ecol_legal(VHierarchyNodeHandle _parent_handle, 
		  VDPMMesh::HalfedgeHandle& v0v1);

  void get_active_cuts(VHierarchyNodeHandle _node_handle, 
		       VDPMMesh::VertexHandle &vl, VDPMMesh::VertexHandle &vr);

  void vsplit(VHierarchyNodeHandle _node_handle, 
	      VDPMMesh::VertexHandle vl, VDPMMesh::VertexHandle vr);

  void ecol(VHierarchyNodeHandle _parent_handle, 
	    const VDPMMesh::HalfedgeHandle& v0v1);

  void init_vfront();
 
};


//=============================================================================
} // namespace OpenMesh
//=============================================================================
#endif // OPENMESHAPPS_VDPMSYNTHESIZERVIEWERWIDGET_HH defined
//=============================================================================