Function IGetControlPoints( _
   ByVal Count As System.Integer, _
   ByRef ControlPoints As System.Double _
) As System.Boolean

Dim instance As ISplineParamData
Dim Count As System.Integer
Dim ControlPoints As System.Double
Dim value As System.Boolean
 
value = instance.IGetControlPoints(Count, ControlPoints)

System.bool IGetControlPoints( 
   System.int Count,
   out System.double ControlPoints
)

System.bool IGetControlPoints( 
&   System.int Count,
&   [Out] System.double ControlPoints
) 

Parameters

Count

Size of ControlPoints array

ControlPoints

• in-process, unmanaged C++: Pointer to an array of doubles (see Remarks)

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

 

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

Return Value

Before calling this method, call ISplineParamData::ControlPointsCount to populate the Count parameter.

Control points determine the shape of a spline or curve. Starting with a set of control points, all other points of a spline can be calculated. A given point on the spline is calculated using the polynomial basis functions of its nearest control points. The knot vector determines which control point basis functions are in force for calculating each point along a curve.

The size of the ControlPoints array is based on the curve dimension:

• if dimension = 2 then each control point has 2 doubles ( x, y )

• if dimension = 3 then each control point has 3 doubles ( x, y, z )

• if dimension = 4, and the curve is closed or periodic, then each control point has 4 doubles ( x, y, z, w ), where w = weight

• if dimension = 4, and the curve is open or non-periodic, then each control point has 4 doubles ( w*x, w*y, w*z, w ), where w = weight

• Size of ControlPoints array = control points count * dimension