Moving west - northwestwards , muifa began to execute a clockwise loop on 17 november and intensified into a typhoon the following day 它于十一月十七日开始以顺时针方向打圈,并在次日增强为一个台风。
The main principles of this new approach are : 1 ) find out the track line segments for vertices of one polygon to another polygon ' s edges ; 2 ) get the enclosing polygon and internal clockwise loops that was formed by the track line segments , finally the result polygons are the final nfps 该算法的基本原理是: 1 )求解多边形顶点相对于另一多边形的轨迹线; 2 )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。