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authors Liu, Clive K.
year 1981
title A Graphic Processor for Computer-Aided Engineering Drawing
source October, 1981. 7 p
summary A drafting system whose purpose of is to provide an advanced tool for teaching engineering drawing and as a production tool for designers who regularly produce engineering drawings is described. The graphic processor is part of the system, which incorporates a set of operations that produce and manipulate graphic entities and that require graphic entities as operands. This paper examines the issues of constructing such a processor. Representations are proposed for 2D graphic objects, including points, line segments and segments generated by conic sections; which are predefined data types in the system. The geometric primitive operators take these objects as arguments and produce other graphic objects, and allow users to build up various construction operators and drawings with the same flexibility and generality allowed in, say, descriptive geometry. These operators, which are functions, can be combined as macro expressions that executed by the processor. This environment allows users to define their own macros for various tasks
keywords CAD, drafting, education, tools
series CADline
references Content-type: text/plain
last changed 2003/06/02 11:58
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