T-FLEX Parametric CAD. Fundamentals. 2D Design

Constructing Splines
Sketch. Creating a Non-parametric Drawing. Automatic parameterization mode
The following group of options provides for constructing splines of two
main types: those directly passing through the defining nodes, and those
using the nodes as vertices of the control polygon. Either type splines can
be either closed or open. Creating sketch splines is mostly similar to
creating construction spline entities.
After defining the first node of any spline, the following options become
available in the automenu:
Finish Spline input
Set graphic line parameters
Offset
Click to select tangent Node (for open splines through
points only)
Cancel selection
When defining spline nodes, the curve being created will be
rubberbanding with the pointer. When creating a spline by control
polygon, the control polygon will also rubberband. To complete spline
creation, use the options , . One can also right click in the
drawing area and select the desired action: cancel spline creation,
reject selection of the last spline node, finish spline input.
When creating a spline, the property window can be used to define the
absolute coordinates over current node being created, the number of
spline segments and the weights (for splines by control polygon).
Open splines through nodes
An open spline passing through nodes is constructed using the option:
Open spline through node
When creating this kind of spline, one can additionally specify end point conditions by using tangency
vectors. The vector directions are defined by specifying an additional node using the option . If called
right after specifying the first spline node, the option creates the tangency vector for the spline start. Calling
the option in the situation, when more than one spline node has been already defined, creates the tangency
vector for the end of spline. In this case, the last defined node of the spline is considered its end, and spline
creation completes automatically at this point.
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