The Object oriented model is built on methodology, while the relational data model is on basis of the set theory. The difference principal between the two models leads to the dispatch problem.
面向对象模型基于方法学原理，关系数据模型基于集合论原理，理论基础的不同导致了两种模型之间的阻抗不匹配。
From the view of object-oriented idea and integrating the particularity of problem, the algorithm with the help of graphic meta data structure is analyzed and simplified.
从面向对象的思想出发，充分结合问题的特殊性，采用图元级粒度的数据结构对问题进行分析，简化了算法。
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