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ConvertArcToBcurve Method (ICurve)

Gets the b-spline value representation of the arc.

.NET Syntax

Visual Basic (Declaration) 
Function ConvertArcToBcurve( _
   ByVal Center As Object, _
   ByVal Axis As Object, _
   ByVal Start As Object, _
   ByVal End As Object _
) As Object
Visual Basic (Usage) 
Dim instance As ICurve
Dim Center As Object
Dim Axis As Object
Dim Start As Object
Dim End As Object
Dim value As Object
 
value = instance.ConvertArcToBcurve(Center, Axis, Start, End)
C# 
object ConvertArcToBcurve( 
   object Center,
   object Axis,
   object Start,
   object End
)
C++/CLI 
Object^ ConvertArcToBcurve( 
&   Object^ Center,
&   Object^ Axis,
&   Object^ Start,
&   Object^ End
)

Parameters

Center
Array for the x, y, z coordinates of the center point of the
arc
Axis
Array for the normal vector of the arc
Start
Array for the x, y, z coordinates of the start point of the arc
End
Array for the x, y, z coordinates of the end point of the arc

Return Value

Array for the b-spline representation of the arc

Remarks

Given coordinates of the center, start, end points and the normal vector of an arc, this method returns the b-spline representation of the arc.

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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