Blend_Extremity::Blend_Extremity (): 
       pt(gp_Pnt(0,0,0)),
       tang(gp_Vec(0,0,0)),
       param(0.0),  u(0.0), v(0.0), tol(0.0),
       isvtx(Standard_False), hastang(Standard_False)
{
}

Blend_Extremity::Blend_Extremity (const gp_Pnt& P,
				  const Standard_Real U,
				  const Standard_Real V,
				  const Standard_Real Param,
				  const Standard_Real Tol) :
       pt(P),
       tang(gp_Vec(0,0,0)),
       param(Param),u(U),v(V),tol(Tol),isvtx(Standard_False),
       hastang(Standard_False)
{
}


Blend_Extremity::Blend_Extremity (const gp_Pnt& P,
				  const Standard_Real U,
				  const Standard_Real V,
				  const Standard_Real Param,
				  const Standard_Real Tol,
				  const TheVertex& Vtx) :
       vtx(Vtx),pt(P),
       tang(gp_Vec(0,0,0)),
       param(Param),u(U),v(V),tol(Tol),isvtx(Standard_True),
       hastang(Standard_False)
{}


Blend_Extremity::Blend_Extremity (const gp_Pnt& P,
				  const Standard_Real W,
				  const Standard_Real Param,
				  const Standard_Real Tol) :
       pt(P),
       tang(gp_Vec(0,0,0)),
       param(Param),u(W),tol(Tol),isvtx(Standard_False),
       hastang(Standard_False)
{}


void Blend_Extremity::SetValue (const gp_Pnt& P,
				const Standard_Real U,
				const Standard_Real V,
				const Standard_Real Param,
				const Standard_Real Tol)
{
  pt    = P;
  u     = U;
  v     = V;
  param = Param;
  tol   = Tol;
  isvtx = Standard_False;
  seqpt.Clear();
}


void Blend_Extremity::SetValue (const gp_Pnt& P,
				const Standard_Real U,
				const Standard_Real V,
				const Standard_Real Param,
				const Standard_Real Tol,
				const TheVertex& Vtx)
{
  pt    = P;
  u     = U;
  v     = V;
  param = Param;
  tol   = Tol;
  isvtx = Standard_True;
  vtx   = Vtx;
  seqpt.Clear();
}

void Blend_Extremity::SetValue (const gp_Pnt& P,
				const Standard_Real W,
				const Standard_Real Param,
				const Standard_Real Tol)
{
  pt    = P;
  u     = W;
  param = Param;
  tol   = Tol;
  isvtx = Standard_False;
  seqpt.Clear();
}


void Blend_Extremity::SetVertex (const TheVertex& V)
{
  isvtx = Standard_True;
  vtx   = V;
}

void Blend_Extremity::AddArc (const TheArc& A,
			      const Standard_Real Param,
			      const IntSurf_Transition& TLine,
			      const IntSurf_Transition& TArc)
{
  seqpt.Append(ThePointOnRst(A,Param,TLine,TArc));
}