public QuadEdge connect(QuadEdge a,QuadEdge b){
  QuadEdge q=QuadEdge.connect(a,b);
  quadEdges.add(q);
  return q;
}

public QuadEdge connect ( QuadEdge a , QuadEdge b ) { QuadEdge q = QuadEdge . connect ( a , b ) ; quadEdges . add ( q ) ; return q ; }
creates a new quadedge connecting the destination of a to the origin of b , in such a way that all three have the same left face after the connection is complete . the quadedge is recorded in the edges list .
