Parametric Pattern-Making Modeling Based on Constraint and Graph

Parametric pattern-making technology has based on procedural process for past decades in the field of GCAD. This paper presents a new method of parametric pattern-making technology. This method firstly finds out the constraint relations among geometric entities by analyzing the rules and sequences of geometric entities in pattern-making operation and confirms the local and whole well-constraint in pattern with geometric constraint principle, secondly represents the geometric constraints in pattern as a constraint graph and depicts the data structure of constraint graph with adjacent table, finally builds a parametric pattern-making model. The solving algorithm of the model implements the entity-edited and size-driven function. The experiments show the model is feasible and effective.