T-FLEX Parametric CAD. Fundamentals. 2D Design

Fundamentals. Two-Dimensional Design
290
Consider another example - constructing a rectangle. In this case, the user needs to define the nodes of its
diagonal corners. The two other nodes, the rectangle side graphic lines and all necessary constructions will
be created by the system automatically. The dialog layout in the properties window is fully analogous to the
dialog for a simple segment.
The first node of the rectangle is created as a node at the intersection of a vertical and horizontal lines (if its
position was picked with in the drawing window or X, Y coordinates entered in the properties window),
or based on the used snaps.
The type of other constructions depends on the method of defining the second rectangle node. If it was
defined by simply clicking in the drawing window with or by defining the dx, dy offsets in the properties
window, then the other lines will be created based on the lines of the first node as parallel to them. When
defining the position of the second node using the “Length” or “Angle” parameters, then the construction
will be created by being also based on the lines of the first node, but according to the specified parameters
(similar to the rules described for a segment). Such construction allows obtaining a parametric model of a
rectangle with a pair of base lines.
When the second node position of the rectangle is defined by the X, Y coordinates in the properties window
or using snaps, the constructions are created independent (or just partially dependent) on the lines of the first
node. For example, if the second node of the rectangle was defined with the absolute coordinates in the
properties window, then it is created on the intersection of another pair of vertical and horizontal lines. Two
other nodes of the rectangle are constructed on the lines parallel to the lines of his first node in going through
the second node. As a result, a parametric model is obtained with two pairs of base lines. When editing such
a rectangle, two its diagonal nodes will move independent from each other.