T-FLEX Parametric CAD. Fundamentals. 2D Design

Sketch. Creating a Non-parametric Drawing. Automatic parameterization mode
For example, if the user defines the X or Y coordinate of the node in the
properties window, then the node will be constructed on the vertical or
horizontal construction lines with the specified coordinate.
If, on the other hand, the offsets dx or dy were defined, then the lines for the
node construction will be created parallel to the vertical or horizontal line
going through the first node (from which the dx or dy offset was counted).
The parallel line parameter will have the value from the respective field of the
properties window. If no horizontal or vertical lines go through the node, from
which the offset was counted, then those will be automatically created by the
system.
When defining an angle value, a line will be created going at the angle to the horizontal; when defining a
length value - a circle of the respective radius.
If some parameter value is defined by a variable or expression in the properties window, then that
variable or expression will be entered in the parameters of the respective construction line. This
rule is applied to all sketch options.
In the case of a combination of any of the described possibilities, a node is created at the intersection of the
respective construction lines.
This approach (defining parameters in the properties window) can be combined with using snaps. For
example, if only one of the node position-defining parameters is entered in the properties window, and a snap
is caught, then, after clicking , the node will be created at the intersection of the construction lines
corresponding to the parameter defined in the properties window, and the snap.
It is also possible to define only one of the parameters in the properties window and not use any snaps (the
precise point position in this case is set by clicking in the 2D window). In this case, the first of the
construction lines, at whose intersection the created node will be positioned, is defined by the specified
parameter. As for the second construction line, the following can be used:
- a vertical or horizontal line (if the X, Y, dx, or dy value was entered in the command's properties
window);
- a line at a distance from the start node and perpendicular to the first line (if an angle value was entered
in the properties window).
For the second example, let's review constructing a circle tangent to one element. When creating such a
circle, a node is constructed after selecting the tangency element, through which the circle should go. In the
sketching mode, then the node is created free. In the auto-parameterization mode, it is created as lying on the
intersection of two lines (a vertical in the horizontal), or defined by the snaps used in its creation. For
example, if snapping to a straight construction line was used to define the node position, then the node will
be created lying on the intersection of that line and a horizontal/vertical line going through the specified
point. After that, a construction circle is created through the resulting node, tangent to the selected element; it
is then used to create a graphic circle.
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