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

This paper presents flexible feature model, introduces its structure and components, and gives the expression instances of the model. This model uses object-oriented method, 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 the online expanding and allow the final user interactively generating the feature. Meanwhile, this paper gives some applications.