T-FLEX Parametric CAD. Fundamentals. 2D Design

Sketch. Creating a Non-parametric Drawing. Automatic parameterization mode
Auto parameterization of other line types is done according to similar rules.
Please note that snapping to graphic lines (snapping to a graphic line itself, to an intersection of graphic
lines, to a midpoint of a graphic line, etc.) with the purpose of creating nodes and lines of the drawing is
implemented by using construction lines underlying the selected graphic lines. By a “construction line
underlying a graphic line” we mean a construction line that is geometrically aligned with the given graphic
line and serves as its parent.
If a graphic line without a parent construction line was selected for snapping, the system will create the
construction line automatically. The created construction line becomes the parent of the graphic line. For
example, if a graphic circle line was selected, with a certain radius and the center aligned to a node, then the
system will create a construction circle with the center at the same node and the same radius. The new
construction line becomes the geometrical basis for the graphic circle line. Similarly, a spline graphic line is
converted to a graphic line lying on a construction spline going through the same nodes. For a segment with
no underlying construction lines, a line is created that is going through the two segment end nodes.
Another common situation is when the general snapping rules in the auto parameterization mode require
creation of a new construction line which would coincide with an existing one. In such a case, the system
will be using the already existing line, which helps reduce the number of created construction lines. For
example, when making a vertical snap to a node, the system must construct a vertical line going through the
selected node. But if there is already a vertical line through that note, the system will use it without creating a
new line.
The drawing process in the automatic parameterization mode can be combined with the conventional method
of creating a parametric drawing.
Editing Sketch
Sketch editing is done by the command “ESK: Edit Sketch”. The command is called by one of the
following ways:
Keyboard Textual Menu Icon
“Edit|Draw|Sketch”
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