2012

Summary
Modifies the data that defines a spline, such as the number and weight of
control vertices, the fit tolerance, and the starting and ending tangents.
NOTE SPLINEDIT automatically converts spline-fit polylines to splines even if you
immediately exit SPLINEDIT after selecting the spline-fit polyline.
The data that defines a spline is represented in one of two formats: as a control
frame or as fit points. The format can change depending on how the spline
was orginally created, the options selected from the grip menus, or the options
used in SPLINEDIT.
You can change any of following data:
■ Control frame data consists of control vertices, the polynomial degree of
the spline, and the weights assigned to each control vertex.
■ Fit data consists of fit points, knot parameterization, the fit tolerance, and
the tangents at the endpoints of the spline.
NOTE Switching from displaying control vertices to fit points automatically changes
the selected spline to degree 3. Splines originally created using higher-degree
equations will likely change shape as a result. In addition, if the spline was created
using a positive tolerance value, the fit points will be relocated to the knots on the
spline, and the tolerance value is reset to 0.
List of Prompts
The following prompts are displayed.
Select spline:
Enter an option [
Close on page 1174/Join on page 1175/Fit data on page 1175/Edit
Vertex
on page 1176/convert to Polyline on page 1177/Reverse on page 1178/Undo
on page 1178] <eXit>:
Close/Open
One of the following options displays, depending on whether the selected
spline is open or closed. An open spline has two endpoints, while a closed
spline forms a loop.
Close Closes an open spline by defining the last point to be coincident with
the first. By default, closed splines are periodic, maintaining curvature
continuity (C2) along the entire curve.
Open Opens a closed spline by removing the final curve segment between
the first and last points specified when the spline was originally created.
1174 | Chapter 19 S Commands