The command can be called in one of the following ways:
Icon 
Ribbon 

Draw > Construct > Function Spline Workplane > Construct > Function Spline 

Keyboard 
Textual Menu 
<FU> 
Construct > Function Spline 
TFLEX CAD enables users to create construction lines given by explicit mathematical description. These lines are called function splines. A function spline allows users to define a construction line of virtually any kind. The main condition is the ability to define a construction line as a coordinate functional relationship. To define a function it is necessary to specify its representation type (parametric, explicit etc), the starting and the ending points of the parameter to be measured, different parameters of detailed curve.
The system provides a set of predefined functions of various curves (parabola, evolvent, helix etc). You can also define your own functions manually and use them in the future. In this case you need to create a description file or add new formulas and parameters values.
The function spline can be drawn as a polyline or spline.
The following options are available to the user:
<Enter> 
Select nearest node or create node defining the function coordinate system 

<Ctrl>+<F> 
Connected node 

<Ctrl>+<F> 
Free node 

<P> 
Set entity Parameters 

<N> 
Select Node 

<A> 
Select axis of symmetry axis (straight line) 

<F4> 

<Esc> 
Exit command 
Drawing of the given function involves two steps:
•To define the coordinate system location. Location of the coordinate system defines the location of the created line. Coordinate system is set by successive choosing two nodes. The first one defines the point with the coordinates (0; 0). The second one defines the direction of the abscissa axis (X). The ordinate axis (Y) is defined automatically, based on the origin of coordinates and the X axis location.
•To set the function type and other parameters. That is done in the function spline parameters dialog popping up after choosing the second node.
You can set a functional relationship in one of the following methods:
•To use a predefined formula from the given set.
•To create a new function.
Users choose the predefined functions via a list. The set of predefined functions is stored in the file function.dat. The file name is defined in the Function spline files parameter available in the Files tab of the system options dialog. The file function.dat can be edited or replaced, if necessary. The parameters in this file are denoted as follows: #1 is the first parameter, #2 is the second one (it is not always needed and is constant for the function calculated). The detailed description of available parameters can be found in the Function Spline Parameters section.
After inputting all the function parameters you should close the parameters dialog by pressing OK. The function spline will be drawn.
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