BSpline

Hello

I have a problem with constructions of bspline curves. Here is my code to design a bspline curve. This code rans very well and I can display it, but the bspline curve passes throught all of the control points (poles).Is this wrong or not?

The answer of my second question is probably basic, but I don't know how many knots and multiplicities I need and how can I define it?

Thanks you very mauch vor your help.

/*Geom_BSplineCurve(const TColgp_Array1OfPnt& Poles,

const TColStd_Array1OfReal& Knots,

const TColStd_Array1OfInteger& Multiplicities,

const Standard_Integer Degree,

const Standard_Boolean Periodic = Standard_False);*/

gp_Pnt P1(0,1,0);

gp_Pnt P2(0.143379,1,0);

gp_Pnt P3(0.42981100,0.902348,0);

gp_Pnt P4(0.756611,0.545098,0.0);

gp_Pnt P5(0.933343, 0.145041,0);

gp_Pnt P6(0.97806,0,0);

gp_Pnt P7(1,0,0);

TColgp_Array1OfPnt array1 (1,7);

array1.SetValue(1,P1);

array1.SetValue(2,P2);

array1.SetValue(3,P3);

array1.SetValue(4,P4);

array1.SetValue(5,P5);

array1.SetValue(6,P6);

array1.SetValue(7,P7);

///////////////////////////////////////////////////////////////////////////////////

Standard_Real R1 = 2; //Knots

//////////////////////////////////////////////////////////////////////////////////

Standard_Integer I1 = 2; //Multiplicities

const Standard_Integer Degree = 3;

const Standard_Boolean Periodic = Standard_False;

Handle (Geom_BSplineCurve) bsc1 = GeomAPI_PointsToBSpline(array1).Curve();

TopoDS_Edge E1 = BRepBuilderAPI_MakeEdge(bsc1);

Handle(AIS_Shape) Edge1 = new AIS_Shape (E1);

myAISContext->Display(Edge1);