Creating splines from Lisp

Petr Vilin

 How to create a quadratic spline with 3 control points or cubic spline with 4 control points from Lisp? I've tried vla-addspline but it only creates splines with fit points.

Roy Klein Gebbinck

Create an AcDb2dPolyline and change its type to acQuadSplinePoly.

Petr Vilin

@Roy Klein Gebbinck:

I need to create a spline, not a polyline, because I need to set weights of control points. And I think I can't do that with polylines.

Roy Klein Gebbinck

I do not have AutoCAD at hand, but it seems that in AC you can set the SPLMETHOD variable to control the degree of the spline. I don't know if this also affects the 'vla' method.

In BricsCAD 'entmaking' a quadratic spline is possible:
[code](entmake
  '(
    (0 . "SPLINE")
    (100 . "AcDbEntity")
    (8 . "0")
    (100 . "AcDbSpline")
    (210 0.0 0.0 1.0)
    (70 . 8)
    (71 . 2)
    (72 . 6)
    (73 . 3)
    (74 . 0)
    (42 . 1e-010)
    (43 . 1e-010)
    (12 0.0 0.0 0.0)
    (13 0.0 0.0 0.0)
    (40 . 0.0)
    (40 . 0.0)
    (40 . 0.0)
    (40 . 1.0)
    (40 . 1.0)
    (40 . 1.0)
    (10 -1.0 1.0 0.0)
    (10 0.0 0.0 0.0)
    (10 1.0 1.0 0.0)
  )
)[/code]