SplinEdit

Select spline to edit

Selects the spline to which the editing operations should apply: pick a single spline. The program shows the spline's fit points (green squares) and places a triangle at the start of the spline:

Close or Open

Depending on whether the selected spline is open or closed, one of the options is available:

• Close - closes an open spline connection the start and endpoint.
• Open - opens a closed spline by removing the segment between the first and last points specified when the spline was originally created.

Join

Joins the spline with an open 2D entity that shares an endpoint with the spline (coincident endpoints); you can join lines, polylines, arcs, elliptical arcs, and other splines. Prompts you:

1. Select any open curves to join to source - (select a connected entity.)

2. Entities in set: 1

3. Select any open curves to join to source - (select another connected entity, or else press Enter.)

The entities joined to the spline take on the properties of the spline, such as its color and linetype.

Fit Data

Edits fit point data using several options; fit points determine the curvature of the spline. Prompts you:

Edit fit data [Add/Close/Delete/Kink/Move/Purge/Tangents/toLerance/eXit] <eXit> - (choose an option:)

Add - adds fit point between two existing ones; prompts you:

1. Select existing fit point <exit> - (select a fit point:) the selected and the next fit point are highlighted in red:
   

2. Specify new fit point to add <exit> - (pick a point to add, as shown by the cursor, above.)

3. Specify new fit point to add <exit> - (pick another point to add, or else press Enter to return to the previous prompt.)

Close/Open - closes an open spline by connecting the start and end points, or else opens a closed spline by removing the segment between the first and last points when the spline was originally created.

Delete : Removes fit points; prompts you:

1. Select fit point to delete <exit> - (select a fit point; the program removes the fit point, and adjusts the shape of the spline.)

2. Select fit point to delete <exit> - (select another point or press Enter to exit.)

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; prompts you:

1. Specify a point on the spline <exit> - (pick a point on the spline to locate the new knot.)

2. Specify a point on the spline <exit> - (pick another point or press Enter.)

Move - moves a fit point; prompts you:

Enter new location or [Next/Previous/Select point/eXit] <N> - (the program automatically selects the first fit point, the one marked by the triangle; enter an option:)

• Pick a new point to relocated the selected fit point
• Choose an option to move to another fit point
• Press Enter to move the next fit point
• Press X to return to the previous prompt

Purge - replaces the fit data from the spline with control vertices:

Tangents - changes the starting and ending tangents of an open spline; prompts you:

1. Specify start tangent or [System default] <System default> - (pick a point for the new starting tangency, or else press Enter to accept the system default.)
   

2. Specify end tangent or [System default] <System default> - (pick a point for the new ending tangency, or else press Enter to accept the system default.)

For closed splines you are prompted to define the tangent at the point of closure.

Tolerance - refits the selected spline to the existing fit points using a new tolerance value; prompts you:

Enter fit tolerance <0.000000> - (type a value.)

Exit - accepts the changes and returns to the previous prompt.

Edit Vertex

Edits control frame data using several options; prompts you:

Edit vertex [Add/Delete/Elevate order/Move/Weight/eXit] <eXit> - (choose an option.)

Add - adds a new control vertex at the point you specify; prompts you:

1. Specify a point on the spline <exit> - (pick a point on the spline to add the control vertex.)

2. Specify a point on the spline <exit> - (pick another point on the spline, or else press Enter to return to the previous prompt.)

Delete - removes control vertex; prompts you:

1. Select control point to delete <exit> - (select a vertex to delete.)

2. Select control point to delete <exit> - (pick another vertex to delete, or else press Enter to return to the previous prompt.)

Elevate Order - increases the polynomial order (degree plus one) of the spline to increase the number of control vertices across the spline; the maximum value is 26. Prompts you:

Enter new order <xx> - (type an integer.)

Move - relocates control vertices one by one; prompts you:

1. Enter new location or [Next/Previous/Select point/eXit] <N> - (pick a point, choose an option or press Enter to move the next fit point.)

2. Enter new location or [Next/Previous/Select point/eXit] <N> - (pick a point, choose an option or press Enter to move the next fit point or press X to stop moving vertices and return to the previous prompt.)

Weight - changes the weight of a specified control vertex and then recalculates the spline based on the new weight value; larger weights pull the spline closer to the control vertex. In the figure below, the red control vertex has a weight of 1:

And here the red control vertex has a weight of 6:

Prompts you:

1. Enter new weight (current = 1.00) or [Next/Previous/Select point/eXit] <N>: - (enter new weight or enter an option.)

2. Enter new weight (current = 1.00) or [Next/Previous/Select point/eXit] <N> - (press Enter to move to the next vertex, enter a value, or else press X to return to the previous prompt.)

Exit - accepts the changes and returns to the previous prompt.

Convert to Polyline

Converts the spline to a polyline. The precision determines how closely the resulting polyline matches the spline: values between 0 and 99 are accepted, with higher values creating more polyline segments. Prompts you:

Specify a precision <10> - (enter an integer.)

The PLINECONVERTMODE variable specifies the kind of polyline to convert to:

• 0 - create polylines with line segments
• 1 - create polylines with arc segments

Reverse

Reverses the direction of the spline; the triangle icon appears on what was formerly the spline's end point.

Undo

Undoes the previous modification.

Exit

Concludes the editing of the spline.