| author: Giulio author: Modified by Robert Lamping, June 3, 2005 author: Consideration: author: An ElementTransformation should be able by itself to undo or redo author: its transformation. This is behaviour that should be encapsulated. author: How to inform the environment that the element has changed is another thing to author: research. author: What to capture to be able to restore the old situation should be author: as much as possible be the responsibility of the ElementTransformation. |