Spline

Task area 2D Objects

You can use this 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 end.

To create a spline

1. Click Spline (How).
   

   Activate Spline in one of the following ways

   • Actionbar:Role Draft Task Design Task area 2D Objects

   • Menu bar: Create Draft

   • Palette: Tools Create area in the following module(s):

   Draft

2. Specify whether the program is to use the start point for connection 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 symbols to the start point and end point of the spline or draw the spline as a pattern line.
   

   You can apply start symbols and end symbols to various 2D elements. To do this, you can use the Properties palette - Element area.

   • Select the symbol you want to use and define its size in millimeters.
   • Decide whether you want to apply a start symbol or an end symbol or both symbols by selecting the relevant the check boxes.
   • While drawing, you can change the symbol or switch it off at any time.
4. Define the individual control points of the spline or click an existing element. Use the tools 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, Allplan places additional points so that they are always orthogonal (unless Enter at right angles or Enter using cursor snap is selected in the dialog line).

   Tip: Click Back to undo as many steps as you want.

5. Press ESC to finish entering points.
6. Specify element or angle for connection: You can 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 similar to curve delimiting points.

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

Tip: Deleting or moving control points of 2D splines and 2D polylines