edge.h

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/* Copyright (C) 2004 Luiz Velho. */

#ifndef EDGE_H
#define EDGE_H

namespace A48 {

class Hedge {
  friend class Mesh;
  friend class Face;
  friend class Edge;

  Vertex    *o_; 
  Hedge     *n_; 
  Face      *f_; 
  Edge      *e_; 

 public:

  Face* face() { return f_; };

  Vertex* org() { return o_; };

  Vertex* dst() { return mate()->org(); };

  Edge*  edge() { return e_; };

  Hedge* prev() { return (n_)? n_->next() : NULL; };

  Hedge* next() { return n_; };

  Hedge* mate();

  int level();

  bool is_bdry();

  bool is_subdiv_itself() { 
    return (face() != NULL && face()->subd_edge() == this); 
  }

 private:

  void set_face(Face* f) { f_ = f; };

  void set_org(Vertex* v) { o_ = v; };

  void set_next(Hedge* h) { n_ = h; };

  void set_edge(Edge* e) { e_ = e; };

  Hedge* reuse(Vertex *v0, Vertex *v1);
};


class Edge : public Markable, public MxHeapable {
  friend class Mesh;

  Hedge h_[2]; 

 public:

  /* @brief The construtctor initializes the vertices of the edge.*/
  Edge(Vertex *p0, Vertex *p1);

  /* @brief Returns a half-edge specified by the index i.*/
  Hedge* hedge(int i);

  Vertex* org() { return h_[0].org(); }

  Vertex* dst() { return h_[1].org(); }

  int level() { return h_[0].level(); }

  bool is_bdry() { return (h_[0].face() == NULL || h_[1].face() == NULL); }

  bool is_subdiv() { return (h_[0].is_subdiv_itself() || h_[1].is_subdiv_itself()); }
};

}

#endif

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