2012

You can close a spline so that the start point and end point are coincident
and tangent. By default, closed splines are mathematically periodic, meaning
that they have the smoothest (C2) continuity at the point of closure.
In the example, both splines are closed, and the point of closure is marked
with a dot. The result of setting the SPLPERIODIC system variable to periodic
is shown on the left, while the result of the legacy setting is shown on the
right.
NOTE The legacy method for creating B-splines by creating a polyline, and then
using the Spline option of the PEDIT command generates only an approximate
“spline-fit” polyline.
See also:
■
Modify Splines on page 708
■ Break and Join Objects on page 699
To draw a spline
1 Click Home tab ➤ Draw panel ➤ Spline.
2 (Optional) Enter m (Method). Then enter either f (Fit Points) or cv
(Control Vertices).
3 Specify the first point of the spline.
4 Specify the next point of the spline. Continue specifying points as needed.
5 Press Enter to end, or enter c (Close) to close the spline.
To draw a spline tangent to and connecting two lines or curves
1 Click Modify tab ➤ Blend Curves.
586 | Chapter 17 Create Objects