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ISEdge.H

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#ifndef ISEDGE_H
#define ISEDGE_H

// Gluebase includes
#define OUTSIDE_GLUE_CORE
#include <mlib/points.H>


class ISVertex;
class ISFace;
class ISMesh;

class ISEdge
{
 public:
  ISEdge(ISVertex *u, ISVertex *v);
  virtual ~ISEdge() {};

  ISVertex* vertex1() const { return _v1; }
  ISVertex* vertex2() const { return _v2; }

  ISFace* face1() const { return _f1; }
  ISFace* face2() const { return _f2; }

  // if v is a vertex of this edge, return the other vertex
  ISVertex* otherVertex(ISVertex *v) const {
    return (v==_v1)?_v2:(v==_v2)?_v1:NULL;
  }

  // if f is a face adjacent to this edge, return the other face
  ISFace *otherFace(ISFace *f) const {
    return (f==_f1)?_f2:(f==_f2)?_f1:NULL;
  }

  double length();
  Wvec vec();

  int isBorder() { return (nfaces() == 1); }

  // building / redefining adjacent faces
  int addFace(ISFace *face) {
    if (_f1 && _f2) {
      cerr << "ISEdge Error: Attempt to add 3rd face!" << endl;
      return 0;
    }
    else if (_f1) 
      _f2 = face;
    else
      _f1 = face;
    return 1;
  }

  int removeFace(ISFace *face) {
    if (face == _f1)
      _f1 = NULL;
    else if (face == _f2)
      _f2 = NULL;
    else {
      cerr << "ISEdge Error: Attempt to remove unknown face!" << endl;
      return 0;
    }
    return 1;
  }

  void setMesh(ISMesh *m);

  int nfaces() {
    int ret = 0;
    if (_f1) ret++;
    if (_f2) ret++;
    return ret;
  }

  int contains(ISVertex* v) const { return (v==_v1 || v==_v2); }

 protected:
  ISVertex *_v1;
  ISVertex *_v2;
  ISFace *_f1;
  ISFace *_f2;

  ISMesh *_mesh;  // the mesh that this ISEdge belongs to

};


#endif

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