本文首先讨论了凸多边形对图形的外裁剪和内裁剪，在此基础上研究了任意多边形对图形的裁剪问题，通过编程应用，效果良好。

This paper first studies the graphic outer and inner cut by convex polygon, then the graphic cut by arbitrary polygon. Its application of compiler program proves to be satisfactory.

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这样使系统的裁剪和外扩在短时间内能够完成。

Therefore, cutting and expanding of the system can finish in a short time.

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