In this paper , the problem of calculating movement of piece is simplified to the problem of finding track line segments between vertices and edges , hence the time complexity is much reduced , and special cases such as inner cavity and inner nfp ( no fit polygon ) can also be tackled 摘要将多边形滑动碰撞问题转化为顶点和边之间的轨迹线提取问题，从而降低了时间复杂度，并可统一处理边界空腔和内部靠接临界多边形问题。
5.
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。
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Landscape city kang taixing the fire fighting equipment limitedcompany , is situated at zhejiang , fujian , in the jianxi threeprovinces borders landscape city xintangbian fire preventionindustry garden area , the transportation is convenient , the road abuts205 federal highways , is apart from the track line 8 kilometers , isapart from the chu chou airport only 60 kilometers 江山市康太星消防设备有限公司，地处浙、闽、赣三省交界的江山市新塘边镇消防工业园区内，交通方便，公路紧靠205国道，距铁路线8公里，距衢州机场仅60公里。
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The system depends on the features of rapidness , simplicity , driving by parameter and fitting for designers ’ habits and blends the size parameter into data structure and by using the driving technology realizes the drawing of single and double track lines of inter - station and the plane arrangement maps of station contact net 该系统依赖参数化方法所具备的快速、简洁、参数驱动、符合设计者习惯等特性，将尺寸参数融入到数据结构中，利用尺寸驱动技术实现尺寸约束，实现区间单、复线和站场接触网平面布置图的绘制。
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