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.

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。

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Sol 1, as the days are known on Mars, was a busy time for the three-legged lander, which set down Sunday in relatively flat terrain cut by polygon-shaped fissures.

NPR: Phoenix Sends Color Photos of Mars to NASA