RESEARCH ON SEARCH AND RECOGNI-TION FOR CONSTRAINT BASED ON COMPREHENSION OF GRAPH

摘要

A promising approach on the search for geometric constraint of directional graph in off-line parametric design has been put forward . The method for representation of the directional graph is given firstly , then the constraint model for every geometry element is put forward . By the search of geometric constraint , it sets up the topology constraint relation on the different element objects , which are not related in geometry data base, and achieves the identify for the directional graph . The algorithm of recognizing geometric constraint is described in detail, in the meantime, the application example in off-line parametric design on dimension-driven is given .