BSPLINE
A uniform B-spline of any degree: a smooth curve pulled towards its control points.
Syntax
BSPLINE degree,[points]
BSPLINE @id,degree,[points],closed,layer
| Argument | Meaning |
|---|---|
| degree | 1 straight lines, 2 quadratic, 3 cubic (the usual). |
| [points] | The control points: at least one more than the degree. |
| closed | TRUE for a smooth loop (optional). |
The id, layer and any settings after it are the element settings.
Examples
BSPLINE 3,[P0..P3]
BSPLINE @2,2,[P0..P3],TRUE,1
Notes
Open, it starts at the first point and ends at the last, passing near (not through) the others. Closed, it passes near all of them. Its knots are worked out from the number of points, so it follows them when they move.
See also: NURBS, CUBICSPLINE.