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Object-Oriented Design

The central editor code has four sets of object-oriented interfaces to various subsystems, including database access, geometry processing, display management, and command parser/human interface. In each case, a common interface has been defined for the set of functions that implement the subsystem; multiple instances of these function sets can exist. The routines in each instance of a subsystem are completely independent of all the routines in other functions sets, making it easy to add new instances of the subsystem. A new type of primitive geometry, a new display manager, a new database interface, or a new command processor can each be added simply by writing all the routines to implement a new subsystem. This approach greatly simplifies software maintenance, and allows different groups to have responsibility for the creation and enhancement of features within each of the subsystems.



Wed Feb 16 13:46:53 EST 1994