Select spline

Specifies which spine you want to modify.

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.

Join

Combines a selected spline with other splines, lines, polylines, and arcs at coincident
endpoints to form a larger spline. Objects are joined with kinks at the points where
they are joined (C0 continuity).

Fit Data

Edits fit point data using the following options:

Add

Adds fit points to the spline.

After selecting a fit point, specify a new fit point to be added to the spline in
the direction of the next fit point, which is automatically highlighted.

If you select the last fit point on an open spline, the new fit point is added to
the end of the spline.

If you select the first fit point on an open spline, you have the option of specifying
whether the new fit point is added before or after the first point.

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.

Delete

Removes selected fit points from a spline.

Kink

Adds a knot and fit point at the specified location on the spline, which does not
maintain tangent or curvature continuity at that point.

Move

Moves fit points to new locations.

• New Location. Moves the selected fit point to the specified location.
  
• Next. Specifies the next fit point.
• Previous. Specifies the previous fit point.
• Select point. Specifies any fit point on the spline.

Purge

Replaces the fit data from the spline with control vertices.

Tangents

Changes the starting and ending tangents of a spline. Specify a point to establish
a tangent direction. You can use object snaps such as Perpendicular or Parallel.

• Specify tangent. (Available for closed splines) Specifies a new tangent direction at the point of
  closure.
• System default. Calculates the default end tangents.

Tolerance

Refits the spline to the existing fit points using the new tolerance value.

Exit

Returns to the previous prompt.

Edit Vertex

Edits control frame data using the following options:

Add

Adds a new control vertex at the point you specify that is located between two existing
control vertices.

Delete

Removes a selected control vertex.

Elevate Order

Increases the polynomial order (degree plus one) of the spline. This results in increasing
the number of control vertices across the spline.The maximum value is 26.

Move

Relocates a selected control vertex.

• New Location
• Next
• Previous
• Select Point

Weight

Changes the weight of a specified control vertex.

• New weight. Recalculates the spline based on the new weight value for the specified control vertex.
  A larger value pulls the spline closer to the control vertex.

Exit

Returns to the previous prompt.

Convert to Polyline

Converts the spline to a polyline.

The precision value determines how closely the resulting polyline matches the spline.
Valid values are any integer between 0 and 99.

The PLINECONVERTMODE system variable determines whether the polylines are created
with linear or arc segments.

The DELOBJ system variable determines whether the original spline is retained.

Reverse

Reverses the direction of the spline. This option is intended primarily for third-party
applications.

Undo

Cancels the last action.

Exit

Ends the command.