An expression method of user-oriented flexible features model and its applications

Presents a flexible feature model, introduces its structure and components, and gives the expression instances of the model. This model uses an object-oriented method, and effectively encapsulates constraints methods in the data-structure from which the general processing object program is separated. This model can effectively express two-dimension complex shape features, support online expansion and allow the final user to interactively generate the features. Some applications are given