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When talking about the modification of a shape or dimensions of an entity, we can distinguish several types of manipulations.
Functions belonging to this group work with the whole entity, regardless of its dimension. They can be applied to an auxiliary line, 1D member (beam, column, etc.), 2D member (plate, wall, etc.).
Typical functions from this group are: Scale, Stretch.
This group of functions manipulates with "lines". The line may be an auxiliary line, 1D member axis, edge of a 2D member.
Typical functions are: Trim, Extend, Enlarge by defined length, Break in defined points, Join, Break in intersections, Reverse orientation.
Functions for the modification of a polyline work with an open or closed polyline.
Typical examples are: Insert node, Delete node, Join curves, Break into curves, Fillet.
These functions modify a curve, regardless of whether it is a circle or a more genral curve (e.g. spline, Bezier curve, etc.). Also functions converting straight lines into curves and vice versa belong to this group.
Typical examples are: Edit arc (by angle, by bulge, by radius), Edit Bezier weight factor, Convert (curve to line, line to circular arc, line to parabolic arc, line to Bezier, line to spline) and also Editing the shape using Drag&Drop feature.