T-FLEX Parametric CAD. Fundamentals. 2D Design

Relations
The created Relations will be always shown on the drawing, whether in the command waiting mode or inside
any 2D command. Some of the existing Relations can be hidden from display, if you specify in the command
properties window, which Relations shall be visible. This is done with the help of flags defining the
visibility/invisibility of each Relation type (all flags are enabled by default):
Relations for construction lines:
Parametric Relations – Relations for construction elements that use
geometrical parameters, which can be defined by variables. Such
geometrical parameters include, for example, an offset line parallel to
another line, an angle of a line inclined with respect to another line or to
the horizontal, a circle radius etc. The exception is vertical and horizontal
lines, for which Relations visibility is controlled by a special flag (see
below).
Symmetry – Relations for lines constructed as the symmetry axis for two
other lines.
Tangency – Relations for elements constructed with the tangency
condition.
Horizontal/Vertical – Relations for vertical and horizontal lines.
Orthogonal – Relations for the lines constructed as perpendicular to other lines.
Relations for nodes:
Free Nodes – Relations for the free nodes, meaning those defined by two coordinates - X, Y.
Relative Nodes – Relations for nodes defined by an offset relative to another node.
Parametric Nodes – Relations for nodes having one numerical parameter. Such nodes include the nodes
on construction lines (circles, splines, functions etc.), as well as a node relative to another node on a
line.
The flags in an additional “Variables” section serve to control the visibility of
Relations depending on whether variables were used to define geometrical
parameters of those elements (by default, those flags are disabled):
Only Related to Variables. When this flag is enabled, the 2D window will
display the Relations only for those construction elements, which were
defined using variables.
The list below shows all numerical variables in the current document. An
additional flag “Show Hidden Variables” serves to display in this list also
the hidden numerical parameters of the current document. Using the list, you
can specify the variables that shall be considered when determining which
Relations to show. To select a variable, you need to set the flag beside its
name (using ).
All variables in the list can be quickly marked with the button . Checks can be cleared off all variables
in the list by the button .
After exiting the command, the Relations hidden by the above-described flags will stay hidden from the
drawing. Nevertheless, they exist in the model. To make them visible, you need to call the “REL: Element
Relations” command again and set the respective flags in its property window. You do not need to create
Relations anymore in this case.
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