Draws a quadratic or cubic spline (nonuniform rational B-spline) curve.
Specify:
1
First point
2 Next point (loops so that you can specify as many points as you
want)
3 Complete the spline by one of the following methods:
a
Close (to close the spline)
b Tangent
- or -
a Enter (to end the spline without closing it)
b Start tangent
c End tangent
The spline is a single entity.