SPLINEDIT — Edit Spline

Edits splines: fit points, control vertices, close, reverse and convert to polyline.

• Command: SPLINEDIT · Global name: _SPLINEDIT · Alias: SPE
• Ribbon: Home › Modify
• Menu: Modify

Edits a spline, as in AutoCAD 2027: closes or opens it, joins other curves to it, changes its fit points or its control vertices, elevates its order, reverses its direction or converts it into a polyline.

Usage

1. Enter SPLINEDIT (or SPE).
2. Select the spline. If it was selected (on its own) before starting the command, it is used without asking.

Select spline:

3. Choose options; the prompt repeats until you choose eXit or press Enter.

Enter an option […/Join/…Edit vertex/convert to Polyline/Reverse/Undo/eXit] <eXit>:

Options

• Close (C) / Open (O): closes or opens the spline (the prompt offers the one that applies).
• Join (J): joins to the spline the selected open splines and lines that start or end at one of its ends (reversing them if needed), as in AutoCAD: the knots of the joined curve follow those of the spline and the joint keeps a multiplicity equal to the degree; joining a line makes the spline rational.

Select any open curves to join to the source:

• Fit data (F): only if the spline has fit points. Lets you Add, Delete and Move fit points, add a Kink (a corner at a point of the curve), change the end Tangents, the toLerance or Purge the fit data (only the control vertices remain). The curve is recalculated.

Enter a fit data option [Add/…/Delete/Kink/Move/Purge/Tangents/toLerance/eXit] <eXit>:
Specify point on the spline <exit>:

• Edit vertex (E): Add a control vertex without changing the shape, Delete or Move vertices, Elevate order (higher degree, same curve) and change their Weight. Editing the vertices removes the fit data.

Enter a vertex editing option [Add/Delete/Elevate order/Move/Weight/eXit] <eXit>:
Enter new order <…>:

• Polyline (P): replaces the spline with a polyline that approximates it.

Specify a precision <10>:

• Reverse (R): reverses the direction of the curve.
• Undo (U): undoes the last option. eXit (X): ends.

Notes

• When moving points you walk them with Next and Previous, or pick one with Select point.
• A kink leaves the spline without fit data (two fit splines joined at the corner); AutoCAD keeps it with them. Join does not join arcs, polylines or ellipses yet.
• The tolerance is saved, but the curve still goes through the fit points.
• With no command running, the spline grips can also be dragged.

See also

SPLINE · PEDIT · PLINE · Editing