Function ICreateSplineByEqnParams( _
   ByRef Properties As System.Integer, _
   ByVal KnotArrayCount As System.Integer, _
   ByRef Knots As System.Double, _
   ByVal ControlPointArrayCount As System.Integer, _
   ByRef ControlPoints As System.Double _
) As SketchSegment

Dim instance As ISketchManager
Dim Properties As System.Integer
Dim KnotArrayCount As System.Integer
Dim Knots As System.Double
Dim ControlPointArrayCount As System.Integer
Dim ControlPoints As System.Double
Dim value As SketchSegment
 
value = instance.ICreateSplineByEqnParams(Properties, KnotArrayCount, Knots, ControlPointArrayCount, ControlPoints)

SketchSegment ICreateSplineByEqnParams( 
   ref System.int Properties,
   System.int KnotArrayCount,
   ref System.double Knots,
   System.int ControlPointArrayCount,
   ref System.double ControlPoints
)

SketchSegment^ ICreateSplineByEqnParams( 
&   System.int% Properties,
&   System.int KnotArrayCount,
&   System.double% Knots,
&   System.int ControlPointArrayCount,
&   System.double% ControlPoints
) 

Parameters

Properties

• in-process, unmanaged C++: Pointer to an array of properties including dimension, order, number of control points, periodicity (see Remarks)

VBA, VB.NET, C#, and C++/CLI: Not supported

See In-process Methods for details about this type of method.

KnotArrayCount

Number of knots

Knots

• in-process, unmanaged C++: Pointer to an array of knots (e.g., knot1, knot2, and so on)
• VBA, VB.NET, C#, and C++/CLI: Not supported

ControlPointArrayCount

Number of control points

ControlPoints

• in-process, unmanaged C++: Pointer to an array of control points (e.g., controlpoint1[dimension], controlpoint2[dimension], and so on)

VBA, VB.NET, C#, and C++/CLI: Not supported

Return Value

The Properties array contains four longs (placed in the first four doubles in the array):

• Dimension

• Order

• Number of Control Points

• Periodicity ( true or false)

The Knots array contains doubles with (Number of Control Points + Order) elements.

The size of the ControlPoints array is based upon the curve dimension.

• Dimension = 2 then each Control Point is an array of 2 doubles ( x, y )

• Dimension = 3 then each Control Point is an array of 3 doubles ( x, y, z)

• Dimension = 4 then each Control Point is an array of 4 doubles ( x, y, z, w ) where w = weight

The parameters are provided as three arrays.

Pass the control point coordinates to this routine in sketch space. The Z value is  interpreted as 0. In certain situations, you must transform your B-curve parameters to sketch space using ISketch::ModelToSketchTransform.

NOTE: The curve can be either periodic or non-periodic. If the generated spline is a closed spline, then it must be flagged as periodic. Additionally, splines generated in sketches must be G1 continuous. If the data passed to this method does not generate a G1 continuous spline, then it is rejected and a spline is not created. If your data is not G1 continuous, then you must split the spline into multiple G1 segments and call this method for each segment.

This method does not work with ISketchManager::AddToDB or ISketchManager::DisplayWhenAdded. It always adds the spline directly to the database (as if ISketchManager::AddToDB(True) is in effect), and you must redraw your document window to see the entities that you added (as if ISketchManager::DisplayWhenAdded(False) is in effect).

To create 3D splines, see IModelDoc2::InsertCurveFilePoint and related functions.