In the T-FLEX system, the drawing image can be drawn above pre-created construction elements. The construction elements that form the drawing framework are infinite lines, circles, splines, ellipses, offset curves, nodes, paths, lines defined by function, that are connected by various geometric relationships. These relationships can be parallelism, tangency, symmetry, angle, and so on. By analogy with drawing on paper, construction elements can be compared to thin pencil lines, which are then outlined with ink. Before you draw graphic lines, you must use the construction lines to define the drawing framework. Graphic lines are then drawn over the framework. Graphic lines in the drawing image are linked to the construction lines, and they will follow them when their positions change. This saves all the geometric relationships that were set for the construction elements.

As you can see in the figure above, increasing the radius of the circle did not affect the geometric relationships of the drawing.

This approach, when drawing elements are interconnected with each other, allows you to get a fully organized drawing.

Construction elements in T-FLEX are construction lines - straight lines, circles, ellipses, splines, paths and nodes. Nodes are points where lines intersect. Construction elements are not output to the printer or plotter. You can also make them invisible at any time.

It is important to note, that before creating construction elements for your drawing, you need to analyze exactly, what relationships between lines you want to set. After all, this will determine the ability of your drawing to parametric changes.

You can assign variables to parameters of construction lines (distances, diameters, etc.). This can be done both during the creation of the construction line and during its subsequent editing. Then it is possible to obtain new versions of the drawing by changing the values of the variables, You can use simple mathematical formulas in the variable editor to link variables.

When you change the position of a construction element, replace a construction element, change the value of a variable, the system recalculates the drawing and then redraws it. Recalculation is performed in accordance with the geometric relations, that were laid down when it was created, as well as based on the mathematical relationships between variables, if they were set. As a rule, a well-created parametric drawing contains several external variables, depending on which the rest of the variables and the entire drawing are recalculated.

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