Namespace: Autodesk.Revit.DB Class: NurbSpline

NurbSpline.CreateCurve(Int32, IList<Double>, IList<XYZ>, IList<Double>)

Method

Description:
Creates a new geometric Curve object from NURBS curve data, which includes weights. The created curve may be a NURBSpline or a simpler curve such as line or arc.

Remarks:
Degree must be 1 or greater. The number of control points must be greater than degree. The number of knots must equal the sum of degree, number of controlPoints and 1. The distinct knot values (ignoring multiplicities) must be in increasing order. The first degree+1 knots should be identical, as should the last degree+1 knots. The multiplicities of other (interior) knots should be less than degree -1. The number of weights must be equal to the the number of control points. The values of all weights must be positive.

Syntax

public static Curve CreateCurve(
	int degree,
	IList<double> knots,
	IList<XYZ> controlPoints,
	IList<double> weights
)

Public Shared Function CreateCurve ( 
	degree As Integer,
	knots As IList(Of Double),
	controlPoints As IList(Of XYZ),
	weights As IList(Of Double)
) As Curve

public:
static Curve^ CreateCurve(
	int degree, 
	IList<double>^ knots, 
	IList<XYZ^>^ controlPoints, 
	IList<double>^ weights
)

static member CreateCurve : 
        degree : int * 
        knots : IList<float> * 
        controlPoints : IList<XYZ> * 
        weights : IList<float> -> Curve

Parameters

Parameter	Type	Description
degree	Int32	The degree of the NURBSpline.
knots	IList	The knots of the NURBSpline.
controlPoints	IList	The control points of the NURBSpline.
weights	IList	The weights of the NURBSpline.

Return Value

Type	Description
Curve	The new Curve object.

Exceptions

Exception	Condition
ArgumentException	The degree must be at least 1. -or- The number of control points must be greater than degree. -or- The number of knots must equal the sum of number of control points, degree and 1. -or- An interior knot must not repeat itself more than degree times. -or- The number of weights must be the same as the number of control points and all weights must be positive.
ArgumentNullException	A non-optional argument was NULL
ArgumentsInconsistentException	Curve length is too small for Revit's tolerance (as identified by Application.ShortCurveTolerance).