Edge.cpp

//
//  file    : Edge.cpp
//  author  : jh
//  date    : 15 jul 2002
//  changed : 
//


#include "Edge.h"



Edge::Edge(Vertex* v1, Vertex* v2) 
{
  _v1 = v1;
  _v2 = v2;
}


Vertex*
Edge::vertex(int i) const
{
  if(i == 0) return _v1;
  if(i == 1) return _v2;
  return 0;
}


void 
Edge::write_XML(QTextStream& cout) 
{
  cout << "<edge ";
  cout << "from=\"" << vertex(0)->ID() << "\" ";
  cout << "to=\"" << vertex(1)->ID() << "\"/>\n";
}

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