Abstract: The secondary development functional the electric principle graphics libraries is established in AutoCAD. A new method named "invisible boundary" is proposed to draw the electrical graphic symbols. The method has efficiently solved "interruption issue" problem occurred in the middle of reinserting electrical circuit drawing symbols. By utilizing this new type of database, the procedure of discontinuing conducting wire can be avoided, which is beneficial to symbols reediting and also improves drafting efficiency.

Key words: Electric principle graphics, AutoCAD, Invisible boundary, Graphic symbol library, Vanishing boundary

摘要： 在 A u t o CAD环境下, 利用二次开发功能建立电器原理图库。提出了建立“ 不可视边界” 绘制电器图形符号的新方法, 有效地解决了电器图形符号再插入过程中的“ 断线” 问题。用这种方法建立的电器原理符号图库,在插入符号时可以不必断开导线, 利于原理图的再编辑, 可以提高作图效率。

关键词: 电器原理图, A u t o CAD, 不可视边界, 电器图形符号库, 消隐边界