本文以有向几何为背景陈述一个微机绘图核心程序包，用它描写数控加工零件的平面外型轮廓，并在微机上绘制各种复杂的平面图形。
In this paper, a core program package related for drawing pictures in micro computers with Oriented Geometry is presented to describe profile of machine parts in numerical control.
一方面是由于操作人员加工前的操作准备不当，另一方面是由于复杂曲线轮廓编程误差所致。
On the one hand, it is caused by the improperly-prepared operators before the machining; on the other hand, it is caused by the complex curve programming error.
由于燃烧室外表面的母线轮廓复杂，手工编制数控加工程序难度大。
Because most firebox generatrix is composed of complex curves, it is very difficult to get CNC cutting program with manual means.
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