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By Jay C.B.

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The notation is introduced and some examples presented, taken from the physical and software worlds, including communicating fax machines and the model-view-controller paradigm used for programming graphical user interfaces (GUIs) in Smalltalk. The purpose of this chapter is to introduce the new notations and associated concepts in an informal way; it is not to give a complete description of them or to bring everything into sharp focus immediately. We are trying in this chapter only to establish a mindset and introduce a notation that expresses it.

Because these paths are alternatives to the earlier one, we can superimpose them to give a composite map, as we have done here. In general, when doing this, paths may be distorted to align responsibilities as we have done here. The forks and joins in the paths of the composite pattern are called OR forks and OR joins because they represent alternative paths. However, they are only artifacts of path superposition, not points where we attach OR logic to the maps. Which path should be followed out of an OR fork depends on the particular end-to-end path that is being followed.

3) The model of the handles-figures relationships is hard to understand in relation to the system as a whole. The model is a set of teams in the DrawingController, with slots in them for objects: teams because handles and associated figures act as teams while a figure is being resized or dragged by a user; in the DrawingController because we imagined the handlesfigure interaction as analogous to ordinary user interactions with the DrawingController. This model requires a mental stretch because it is not obvious that these interactions are logically part of the MVC, or even at the same level of abstraction as the MVC.

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An introduction to categories in computing by Jay C.B.

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