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CreateCurve Method (Int32, IList(Double), IList(XYZ))

Creates a new geometric Curve object from NURBS curve data, which does not include weights. The created curve may be a NURBSpline or a simpler curve such as line or arc.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2017

Syntax

C#
public static Curve CreateCurve(
	int degree,
	IList<double> knots,
	IList<XYZ> controlPoints
)
Visual Basic
Public Shared Function CreateCurve ( _
	degree As Integer, _
	knots As IList(Of Double), _
	controlPoints As IList(Of XYZ) _
) As Curve
Visual C++
public:
static Curve^ CreateCurve(
	int degree, 
	IList<double>^ knots, 
	IList<XYZ^>^ controlPoints
)

Parameters

degree
Type: SystemInt32
The degree of the NURBSpline.
knots
Type: System.Collections.GenericIListDouble
The knots of the NURBSpline.
controlPoints
Type: System.Collections.GenericIListXYZ
The control points of the NURBSpline.

Return Value

The new Curve object.

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.

Exceptions

ExceptionCondition
Autodesk.Revit.ExceptionsArgumentException 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.
Autodesk.Revit.ExceptionsArgumentNullException A non-optional argument was NULL
Autodesk.Revit.ExceptionsArgumentsInconsistentException Curve length is too small for Revit's tolerance (as identified by Application.ShortCurveTolerance).

See Also