Function ICreateSplinesByEqnParams( _
   ByRef PropArray As Integer, _
   ByRef KnotsArray As Double, _
   ByRef CntrlPntCoordArray As Double _
) As EnumSketchSegments

Dim instance As IModelDoc2
Dim PropArray As Integer
Dim KnotsArray As Double
Dim CntrlPntCoordArray As Double
Dim value As EnumSketchSegments
 
value = instance.ICreateSplinesByEqnParams(PropArray, KnotsArray, CntrlPntCoordArray)

EnumSketchSegments ICreateSplinesByEqnParams( 
   ref int PropArray,
   ref double KnotsArray,
   ref double CntrlPntCoordArray
)

EnumSketchSegments^ ICreateSplinesByEqnParams( 
&   int% PropArray,
&   double% KnotsArray,
&   double% CntrlPntCoordArray
) 

Parameters

PropArray

Array of dimension, order, number of control points, periodicity (see Remarks)

KnotsArray

knot1, knot2, and so on (see Remarks)

CntrlPntCoordArray

controlpoint1[dimension], controlpoint2[dimension], and so on (see Remarks)

Return Value

The PropArray array contains four integers (placed in the first four doubles in a Visual Basic for Applications (VBA) SafeArray):

• Dimension

• Order

• Number of Control Points

• Periodicity ( True or false )

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

The size of the CntrlPntCoordArray 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

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: 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.

You can use the returned object pointer directly to call any APIs on the ISketchSegment interface, or use QueryInterface to obtain the pointer to the ISketchSpline and any APIs on the ISketchSpline interface.

This method does not work with IModelDoc2::SetAddToDB or IModelDoc2::SetDisplayWhenAdded. It always adds the spline directly to the database (as if IModelDoc2::SetAddToDB(True) is in effect), and you must redraw your document window to see the entities that you added (as if IModelDoc2::SetDisplayWhenAdded(false) is in effect).

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