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//=============================================================================
//
//  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 =========================================================

	      
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:

  explicit VDPMSynthesizerViewerWidget(QWidget* _parent=0, const char* _name=0);

  ~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) override;

protected:

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

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
//=============================================================================
