本课题中主要通过基于数据的建模和基于图像的建模实现，并在建模过程中体会到图形生成算法在可视化中的应用。
In this paper, it is realized by data-based modeling and graphics-based modeling. The corresponding arithmetics are applied in the process.
传统的图形化编程平台大多采用基于数据驱动的扫描运行算法，CPU占用率高，运行效率低。
Most traditional graphical programming platforms adopt running algorithmic based on data-driven mode, which leads to inefficient use of CPU and low execution performance.
针对图形文件以矢量方式记录几何实体的特点，提出了一种基于改进几何哈希法的图形检索算法。
In view of the fact that geometric entities are recorded in vector form in graphics file, this paper presents an algorithm based on modified geometric hashing for shape retrieval.
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