Editing the shape using Drag&Drop feature

The shape of 1D members may be changed using the Drag&Drop feature. Any end point of 1D member can be "grabbed" and "dragged" over the working plane. The trajectory of the dragging determines whether the operation is a pure rotation or shape modification.

If a curved 1D member is modified in this way, it is possible to pick not only the end-point, but also the characteristic point of the curve. Thus e.g. the shape of Bezier curve can be modified, etc.