autocad 的一般特性(外文文献翻译).doc

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autocad 的一般特性(外文文献翻译),autocad is a general purpose computer aided drafting application program designed for use on single-user, desktop personal computers and graphic workstations. i...
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AutoCAD is a general purpose computer aided drafting application program designed for use on single-user, desktop personal computers and graphic workstations. It was initially developed in the early 1980's by Autodesk Inc., Sausalito, California. It is currently distributed in Australia by Autodesk Australia, now located in Sydney. These notes have been updated to describe Release 12 of that package.
Concepts and definitions
AutoCAD is an interactive drawing system designed to permit a user to construct or edit a drawing on a graphics display screen. To this extent, it is analogous to a wordprocessing program, except that in this case the thing being processed is a drawing. Each drawing is stored on a disk file, and AutoCAD is only able to edit one drawing (or file) at a time. This similarity to word processors is reflected in the fact that the principal functional component of AutoCAD is known as the drawing editor.
Up until Release 10, AutoCAD was essentially a two-dimensional drawing system. Following that release, it now supports a full three-dimensional database. This has had the effect that the features of AutoCAD that support two-dimensional drawing are fully self-contained and can still be used as a 2D system without being concerned with its 3D features. In this course we will focus on the 2D drafting aspects of AutoCAD since that better reflects the way in which this system is generally used in practice at the present time. Several sections in these notes explain how the 3D features have been incorporated into AutoCAD, but provide little detail of the 3D operations.
In order to understand AutoCAD, we must focus on a few specific concepts.
AutoCAD 是一个一般用途的计算机起辅助设计的软件,它是为单一使用者,桌面个人计算机和图形工作站上设计的。它最初在1980 年代早期由加州的Sausalito 的Autodesk 公司开发。它现在分布澳洲悉尼的Autodesk。 这些笔记已经被更新来描述那一个版本12。
概念和定义
AutoCAD 是一个交互式图形设计系统,允许一个使用者构造或编辑在一个图形显示屏上的一幅图画。 对这范围,它与一个 字处理程序是类似的,除了处理一幅图画以外。 每幅图画被储存在一个磁盘文件上,而且 AutoCAD 一次只能够编辑一幅图画 ( 或文件)。 这与文件处理器类似,反映AutoCAD 的主要功能图画编辑。到版本10, AutoCAD 本质上是一个二维空间的图形系统。 紧跟着版本 10,它现在支持一个完整的三度空间的数据库。 这已经有效果,AutoCAD的特征支持二维空间的图形完全自我包含的,而且能被当作一个2D系统而没有与它的3D立体特征有关系。在这课程中,我们将会把重心集中在AutoCAD的2D起草方面,因为这更好的反映现在在实际中这系统通常的方法。 这些笔记的一些片断中,3D特征如何已经被AutoCAD整合, 但是并不提供3D操作细节。 为了了解AutoCAD,我们一定把重心集中放在一些特定的观念上。