Rotation

Rotate is an editing operation performed with the left mouse button and the CTRL key on the keyboard. It works similar to the move command by dragging with the left mouse key. In contrast to the move operation, the CTRL key has to be pressed in addition to the left mouse button. The pivot point of the rotation is always the center of gravity of the rotated object. Different types of objects can be rotated: For nobs like neurons or pipes an explicit rotation operation doesn't make sense, as the orientation of these objects is determined by connected objects.
 * The complete model - Left mouse button + CTRL key
 * The active selection - Left mouse button + CTRL key + SHIFT key
 * Connectors - Position the mouse cursor over the connector so that it is highlighted. Then press left mouse button + CTRL-Key
 * The orientation of a pipe is determined by the start- and endpoint. A pipe can be rotated indirectly by moving one of these points.
 * Neurons and input neurons have an orientation due to the direction of the axon.
 * The orientation of output neurons is determined by the program by summing the directions of incoming pipes