// File:	StepToGeom_MakeBSplineCurve.pxx
// Created:	Fri Jul  2 15:16:54 1993
// Author:	Martine LANGLOIS

{
  Handle(StepGeom_BSplineCurveWithKnots)   BSCW;
  Handle(StepGeom_BSplineCurveWithKnotsAndRationalBSplineCurve) BSCWR;

  if (SC->IsKind(STANDARD_TYPE(StepGeom_BSplineCurveWithKnotsAndRationalBSplineCurve))) {
    BSCWR = 
      Handle(StepGeom_BSplineCurveWithKnotsAndRationalBSplineCurve)
	::DownCast(SC);
    BSCW = 
      Handle(StepGeom_BSplineCurveWithKnots)
	::DownCast(BSCWR->BSplineCurveWithKnots());
  }
  else
    BSCW = Handle(StepGeom_BSplineCurveWithKnots)::DownCast(SC);

  const Standard_Integer Deg = BSCW->Degree();
  const Standard_Integer NbPoles = BSCW->NbControlPointsList();
  //aControlPointsList = new StepGeom_HArray1OfCartesianPoint(1,NbPoles);
  const Handle(StepGeom_HArray1OfCartesianPoint)& aControlPointsList = BSCW->ControlPointsList();
  Array1OfPnt_gen Poles(1,NbPoles);

  Standard_Integer i;
  CartesianPoint_gen P;
  for (i=1; i<=NbPoles; i++)
  {
    if (StepToGeom_MakeCartesianPoint_gen::Convert(aControlPointsList->Value(i),P))
      Poles.SetValue(i,P->Pnt_fonc());
    else
      return Standard_False;
  }
  
  const Standard_Integer NbKnots = BSCW->NbKnotMultiplicities();

  //aKnotMultiplicities = new TColStd_HArray1OfInteger(1,NbKnots);
  const Handle(TColStd_HArray1OfInteger)& aKnotMultiplicities = BSCW->KnotMultiplicities();
  TColStd_Array1OfInteger Mult(1,NbKnots);
  for (i=1; i<=NbKnots; i++) {
    Mult.SetValue(i,aKnotMultiplicities->Value(i));
  }
  
  //aKnots = new TColStd_HArray1OfReal(1,NbKnots);
  const Handle(TColStd_HArray1OfReal)& aKnots = BSCW->Knots();
  TColStd_Array1OfReal Kn(1,NbKnots);
  for (i=1; i<=NbKnots; i++) {
    Kn.SetValue(i,aKnots->Value(i));
  }
  
  // --- Does the Curve descriptor LOOKS like a periodic descriptor ? ---

  Standard_Integer SumMult = 0;
  for (i=1; i<=NbKnots; i++) {
    SumMult += aKnotMultiplicities->Value(i);
  }
  
  Standard_Boolean shouldBePeriodic;
  if (SumMult == (NbPoles + Deg + 1)) {
    shouldBePeriodic = Standard_False;
  }
  else if ((aKnotMultiplicities->Value(1) == 
	    aKnotMultiplicities->Value(NbKnots)) &&
	   ((SumMult - aKnotMultiplicities->Value(1)) == NbPoles)) {
    shouldBePeriodic = Standard_True;
  }
  else {  // --- What is that ??? ---
    shouldBePeriodic = Standard_False;
    //cout << "Strange BSpline Curve Descriptor" << endl;
  }

  if (SC->IsKind(STANDARD_TYPE(StepGeom_BSplineCurveWithKnotsAndRationalBSplineCurve))) {
    const Handle(TColStd_HArray1OfReal)& aWeight = BSCWR->WeightsData();
    TColStd_Array1OfReal W(1,NbPoles);
    for (i=1; i<=NbPoles; i++)
      W.SetValue(i,aWeight->Value(i));
    CC = new BSplineCurve_gen(Poles, W, Kn, Mult, Deg, shouldBePeriodic);
  }
  else
    CC = new BSplineCurve_gen(Poles, Kn, Mult, Deg, shouldBePeriodic);

  // abv 04.07.00 CAX-IF TRJ4: trj4_k1_top-md-203.stp #716 (face #581):
  // force periodicity on closed curves
  if ( SC->ClosedCurve() && CC->Degree() >1 && CC->IsClosed() ) {
    CC->SetPeriodic();
//#ifdef DEB
//    cout << "Warning: "__FILE__": Closed curve made periodic" << endl;
//#endif
  }
  return Standard_True;
}