Traits.hh

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//=============================================================================
//
//  CLASS Traits
//
//=============================================================================
 
#ifndef OPENMESH_SUBDIVIDER_ADAPTIVE_TRAITS_HH
#define OPENMESH_SUBDIVIDER_ADAPTIVE_TRAITS_HH
 
 
//== INCLUDES =================================================================
 
#include <map>
#include <OpenMesh/Core/Mesh/Types/TriMesh_ArrayKernelT.hh>
 
//== NAMESPACE ================================================================
 
namespace OpenMesh   { // BEGIN_NS_OPENMESH
namespace Subdivider { // BEGIN_NS_DECIMATER
namespace Adaptive   { // BEGIN_NS_ADAPTIVE
 
 
//== CLASS DEFINITION =========================================================
 
// typedef unsigned short state_t;
// const state_t mask_final = 1 << ((sizeof(state_t)*8)-1);
// const state_t mask_state = ~mask_final;
 
typedef int  state_t;
typedef bool final_t;
   
struct State
{
   int      state : 31;
   unsigned final : 1;
};
   
struct Traits : public OpenMesh::DefaultTraits
{
   
  // add face normals
  FaceAttributes( OpenMesh::Attributes::Normal );
  
  // add vertex normals
  VertexAttributes( OpenMesh::Attributes::Normal );
 
  // add previous halfedge handle
  HalfedgeAttributes( OpenMesh::Attributes::PrevHalfedge );
   
  FaceTraits
  {
 
  private:
 
    typedef typename Refs::Point Point;
    typedef typename Refs::HalfedgeHandle HalfedgeHandle;
    typedef std::map<state_t, Point> PositionHistory;
 
    State                state_;
    HalfedgeHandle       red_halfedge_;
 
    PositionHistory      pos_map_;
    
  public:
 
    // face state
    state_t state() const { return state_t(state_.state); }
    void    set_state(const state_t _s) { state_.state = _s; }
    void    inc_state() { ++state_.state; }
 
    // face not final if divided (loop) or edge not flipped (sqrt(3))
    final_t final() const   { return final_t(state_.final); }
    void    set_final()     { state_.final = true; }
    void    set_not_final() { state_.final = false; }
 
    // halfedge of dividing edge (red-green triangulation)
    const HalfedgeHandle& red_halfedge() const { return red_halfedge_; }
    void  set_red_halfedge(const HalfedgeHandle& _h) { red_halfedge_ = _h; }
 
    // position of face, depending on generation _i. 
    void set_position(const int& _i, const Point& _p) { pos_map_[_i] = _p; }
    const Point position(const int& _i) { 
      if (pos_map_.find(_i) != pos_map_.end())
        return pos_map_[_i];
      else {
        
        if (_i <= 0) {
          const Point zero_point(0.0, 0.0, 0.0);
          return zero_point;
        }
 
        return position(_i - 1);
      }
    }
  }; // end class FaceTraits
 
 
  EdgeTraits
  {
 
  private:
 
    typedef typename Refs::Point Point;
    typedef std::map<state_t, Point> PositionHistory;
 
    State           state_;
    PositionHistory pos_map_;
 
  public: 
 
    typedef typename Refs::Scalar Scalar;
 
    // Scalar weight_;
 
    // state of edge
    state_t state() const { return state_t(state_.state); }
    void    set_state(const state_t _s) { state_.state = _s; }
    void    inc_state() { ++state_.state; }
 
    // edge not final if dividing face (Loop) or edge not flipped (SQRT(3))
    final_t final() const   { return final_t(state_.final); }
    void    set_final()     { state_.final = true; }
    void    set_not_final() { state_.final = false; }
 
    // position of edge, depending on generation _i. 
    void set_position(const int& _i, const Point& _p) { pos_map_[_i] = _p; }
    const Point position(const int& _i) {
 
      if (pos_map_.find(_i) != pos_map_.end()) 
      {
        return pos_map_[_i];
      }
      else 
      {
        if (_i <= 0) 
        {
          const Point zero_point(0.0, 0.0, 0.0);
          return zero_point;
        }
 
        return position(_i - 1);
      }
    }
  }; // end class EdgeTraits
 
 
  VertexTraits
  {
 
  private:
 
    typedef typename Refs::Point Point;
    typedef std::map<state_t, Point> PositionHistory;
 
    State   state_;
 
    PositionHistory pos_map_;
 
  public:
 
    // state of vertex
    state_t state() const { return state_.state; }
    void    set_state(const state_t _s) { state_.state = _s; }
    void    inc_state() { ++state_.state; }
 
 
    // usually not needed by loop or sqrt(3)
    final_t final() const   { return state_.final; }
    void    set_final()     { state_.final = true; }
    void    set_not_final() { state_.final = false; }
 
    // position of vertex, depending on generation _i. (not for display)
    void set_position(const int& _i, const Point& _p) { pos_map_[_i] = _p; }
    const Point position(const int& _i) { 
 
      if (pos_map_.find(_i) != pos_map_.end()) 
 
        return pos_map_[_i];
 
      else {
 
        if (_i <= 0) {
 
          const Point zero_point(0.0, 0.0, 0.0);
          return zero_point;
        }
 
        return position(_i - 1);
      }
    }
  }; // end class VertexTraits
}; // end class Traits
 
//=============================================================================
} // END_NS_ADAPTIVE
} // END_NS_SUBDIVIDER
} // END_NS_OPENMESH
//=============================================================================
#endif // OPENMESH_SUBDIVIDER_ADAPTIVE_TRAITS_HH defined
//=============================================================================