Splines

Module(s): Draft

You can use the Spline tool to draw a spline. A spline is a curve that connects a predefined sequence of control points as smoothly as possible. The spline can be connected to an existing element at any angle in its start and end point. You can also apply a symbol to its start and/or end.

To create a spline

1. Click Spline (How).
   

   Activate Spline in one of the following ways

   • Menu bar: Create Draft

   • Toolbar: Basic Tools Draft flyout
   • Palette: Tools Create area in the following module(s):

   Draft

2. Specify whether the program is to use the start point for connection and/or use the end point for connection when you have finished entering points.

   Note: If you do not define a connection, the program uses the natural connection condition.

3. You can apply a symbol to the start and/or end of the spline.
   

   Start and end symbols can be applied to various 2D entities.

   • Select a symbol and define its size in millimeters.
   • Select the start symbol and/or end symbol by checking the relevant box(es).
   • You can change this symbol or switch it off at any time while you are drawing
4. Define the individual control points of the spline or click an existing element. Use the drawing aids for polygonizing elements to define the points.
   

   • Click the point.
   • Align to points using the linear snap function and click the point.
   • Define the point by making entries in the dialog line.

   Tip: To find out how to enter points in Allplan, see Precision Drawing.

   Tip: The shortcut menu and dialog line provide tools and options to assist you in the process of entering points. For more information, see Tools and Options.

   Tip: When you press and hold down the SHIFT key after you have placed the first point, additional points are created so that they are always orthogonal unless Enter at right angles or Enter using cursor snap is enabled in the dialog line.

   Tip: Back allows you to undo every entry made in reverse order.

5. Press ESC to finish entering points.
6. Specify element or angle for connection: if necessary, define a connection in the point marked.
   If the first or last point of the spline is also the start or end point of another element, the program uses the direction and curvature of the element at the connecting point as the connection condition for the spline. Simply click this element. Otherwise, you can choose a direction angle from various default values or enter any value. Press ENTER to confirm the value.

Note: The spline’s control points are displayed like curve delimiting points.

(A) Connecting element
(B) Start point
(C) Spline
(1) Click points

Tip: Deleting or moving control points of splines and polylines