The algorithm proposed by us for polygonal chains intersection based on the sweep line algorithm is extended, and it is used to detect and delete global self-intersections in the rough offset curve.
拓展了我们已有的平面上单调链求交的扫描线算法，将其应用到初步等距线中的全局自交点和全局无效环的确定上。
Furthermore the vibration and noise mainly comes from the polygonal action which generates the longitudinal vibration of chains.
而在自动人行道的链传动系统中多边形效应引起的纵向振动是振动和噪声的主要来源。
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