By realization of this tool, general designing idea of professional drawing tool is thrown light on.
通过这些基本的绘图功能的实现来说明专业的复杂绘图工具所采用的一般思想。
The paper introduces a transformation by PLC and frequency-changer in the light of current lashing problem of drawing-oil tube cleaning machine in oil field enterprises.
本文针对油田企业中抽油管清污机中存在的冲击问题，用PLC、变频器等对其控制进行了改造。
Then, the basic principles of drawing 3d graph by computer are discussed, particularly explained the fundamental theory of coordinate transform, projection transform and light model.
对三维图形计算机显示的基本原理进行了讨论，详细介绍了坐标系变换、投影变换和明暗处理及光照模型的基本原理。
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