SPLINE
Several elements joined end to end into one: lines, arcs, Béziers and any other open curves.
Syntax
SPLINE [segment,segment,…]
SPLINE @id,[segment,segment,…],layer
| Argument | Meaning |
|---|---|
| segment | An element command, such as LINE P0,P1 or ARC P1,P4,P2,TRUE. Each starts where the last one ends. |
The id, layer and any settings after it are the element settings.
Examples
P4=[500,200]
SPLINE @1,[LINE P0,P1,ARC P1,P4,P2,TRUE,LINE P2,P3]

Notes
The segments belong to the spline: they are not separate elements in the drawing. JOIN makes a spline of elements that are already drawn, and EXPLODE breaks one back into its segments.
See also: POLYLINE, Spline Tool.