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ICreateSplineByEqnParams Method (IModelDoc2)

Obsolete. Superseded by ISketchManager::ICreateSplineByEqnParams.

.NET Syntax

Visual Basic (Declaration) 
Function ICreateSplineByEqnParams( _
   ByRef PropArray As System.Integer, _
   ByRef KnotsArray As System.Double, _
   ByRef CntrlPntCoordArray As System.Double _
) As SketchSegment
Visual Basic (Usage) 
Dim instance As IModelDoc2
Dim PropArray As System.Integer
Dim KnotsArray As System.Double
Dim CntrlPntCoordArray As System.Double
Dim value As SketchSegment
value = instance.ICreateSplineByEqnParams(PropArray, KnotsArray, CntrlPntCoordArray)
SketchSegment ICreateSplineByEqnParams( 
   ref System.int PropArray,
   ref System.double KnotsArray,
   ref System.double CntrlPntCoordArray
SketchSegment^ ICreateSplineByEqnParams( 
&   System.int% PropArray,
&   System.double% KnotsArray,
&   System.double% CntrlPntCoordArray


Includes dimension, order, number of control points, periodicity
knot1, knot2, and so on
ontrolpoint1[dimension], controlpoint2[dimension], and so on

Return Value

Newly created spline


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.


See Also


SOLIDWORKS 2001Plus FCS, Revision Number 10.0

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