Get the enclosing polygon and internal clockwise loops that was formed by the track line segments, finally the result polygons are the final NFPs.
求解轨迹线集合所形成的外包多边形和内部顺时针环，得到的多边形即为临界多边形。
Get the enclosing polygon and internal clockwise loops that was formed by the track line segments, finally the result polygons are the final NFPs.
求解轨迹线集合所形成的外包多边形和内部顺时针环，得到的多边形即为临界多边形。
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