在研究了现有图形提取算法的基础上，本文针对手绘图形绘制不规则的特点，提出了一种新的图形识别算法—基于直线段跟踪的手绘图元识别算法。

After studying the existing graphics extraction algorithm, a new graphics recognition algorithm-an off-line recognition method for freehand graphics based on line segment tracing is proposed.

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同时还利用计算机图形学原理，对管件外圆表面直线段、弯曲段的三维绘制进行处理分析。

Meanwhile, the drawing regulations about line segments and curly segments of tube bending surface are analysed.

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