【摘要】 图形输入是CAD中的一个关键问题。如何能有效、快速和简便地输入实际图形,对提高CAD系统的功能具有重要作用。为此,本文提出基于图素拼合法的机械零件图形输入方法:以圆弧作基本线素直接参加运算;在拼合法中除有基本的并、交、差运算外,采用粘合新算法及对不同类型的机械零件采用不同的基本图素;还引入直线圆弧交切、倒角和圆角等辅助功能。更多还原

【Abstract】 Graphic input is one of the important problems on computer aided design. A software package of computer aided design for mechanical parts, including graphic input system based on graphic element join, has been implemented. The system has the abvantages of direct percept, high speed and so on. To input more simply, are is abopted to be basic element and a new kind of method-binding operation is presented. To calculate more quickly and accurately, new auxiliary functions: L-C intersection, L-C tangeney, chamfer and fillet, are drawn.更多还原