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从图形数据库中提取样图信息，建立反映图线实体间拓朴关系的实体性和不同类型的尺寸链；对尺寸作派生处理，建立尺寸树；交互输入尺寸新值，利用尺寸树和图线间拓朴关系对实体求新值；用新值更新图形数据库，从而生成新图。本文提出了划分实体组的新方法；可处理串联角度尺寸；能较好地处理多层尺寸的重新标注。
Extract the sample information from the graphic database, establish the entity and different types of dimension chains that reflect the topological relations among the entity of the graph line; derive the size to establish the size tree; interactively input the new value of the size, and use the size tree and the graph line The topology relationship between the new value of the entity; with the new value to update the graphics database, resulting in a new map. In this paper, a new method of grouping entities is proposed; the size of tandem angles can be handled; and the re-labeling of multi-layer sizes can be handled well.