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。
Select the circle curve just beneath it and for number of items in the options panel, type 46. Delete the original gear curve, and then select all the arrayed ones and join them.
选择下方的圆形线，在参数面板中输入个数46，删除原始齿线，然后，选择所有阵列曲线，合并。
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