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ConvertLineToBcurve Method (ICurve)

Converts the specified line into a b-spline curve.

.NET Syntax

Visual Basic (Declaration) 
Function ConvertLineToBcurve( _
   ByVal StartPoint As System.Object, _
   ByVal EndPoint As System.Object _
) As System.Object
Visual Basic (Usage) 
Dim instance As ICurve
Dim StartPoint As System.Object
Dim EndPoint As System.Object
Dim value As System.Object
 
value = instance.ConvertLineToBcurve(StartPoint, EndPoint)
C# 
System.object ConvertLineToBcurve( 
   System.object StartPoint,
   System.object EndPoint
)
C++/CLI 
System.Object^ ConvertLineToBcurve( 
&   System.Object^ StartPoint,
&   System.Object^ EndPoint
)

Parameters

StartPoint

Array values for the coordinates of the start point of the line

EndPoint

Array values for the coordinates of the end point of the line

Return Value

Array values giving the b-spline representation of the line

Remarks

Given coordinates of two end points of a line, this method returns the b-spline representation of the line. The returned data are doubles arranged in the following order:

  • dim, order

Two integers packed into a double.

 
  • dim

Dimension of the control point data.

If dim=3 (non-rational), control point coordinates are returned as [x0,y0,z0,x1,y1,z1,.....].

If dim=4 (rational), control point coordinates are returned as [x0,y0,z0,w0,x1,y1,z1,w1,.....], where w is the weight for the point.

 
  • order

Order of the b-spline returned.

  • NumControlPoints, Periodic

Two integers packed into a double.

 
  • NumControlPoints

Number of control points for the b-spline.

 
  • Periodic

True if the b-spline is periodic.

  • Knots

Knot vectors. The Knot array contains (NumControlPoints + order) knot values. If the original curve is periodic, then the data is  returned in a non-periodic form with extra knots inserted at the curve ends.

  • ControlPoints

List of control points output in (NumControlPoints) vectors of dimension dim.

For non-rational b-spline, control point coordinates are output as [x0,y0,z0,x1,y1,z1,.........].

For rational b-spline, control point coordinates and the weight are output as [x0,y0,z0,w0,x1,y1,z1,w1,........], where w is the weight for the point.

 

See Also



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0.20.21