Rotating an entity using Drag&Drop feature

The Drag&Drop feature can be in some special cases applied also for the rotation of an entity. During the Drag&Drop operation, just one of the end point of a 1D member can be moved to another location. If some specific conditions are satisfied, the result of the operation may be the rotation of a 1D member.

The conditions that must be fulfilled are:

• One of the 1D members end-points must also be the centre of rotation.

• The other end-point must be the point that is being Drag&Dropp-ed.

• The original and target position of the moved point must lie on a circle with the centre in the centre of rotation defined above.

If the last of the conditions stated above is not satisfied, the "move" is still a kind of rotation, but simultaneously, the 1D member changes its length. Such an operation is not called rotation in the full meaning of the word and is considered to be an operation changing dimensions of a member.

The procedure for the Drag&Drop rotation

1. Select one end node of the 1D member you want to rotate.

2. Place the mouse cursor on the selected node.

3. Press the left mouse button and hold it down.

4. Drag the mouse over the graphical window until the node reaches the intended target position. You will see the current position of the moved entity in thin-line style.

5. Release the mouse button.