怒火之袍的贡献，有算法介绍如判断点是否在线段上、判断两线段是否相交、判断线段和直线是否相交、判断点是否在多边形中、判断线段是否在多边形内、计算点到线段的最近点、计算点到圆的最近距离及交点坐标、计算两条共线的线段的交点、求线段或直线与圆的交点、凸包的求法等等，图文并茂-Army's contribution to the gowns, as introduced algorithm to determine the point of whether online, to judge whether two line segments intersect, Line judge whether the intersection of straight lines and determine whether a polygon, line judge whether the polygon, Calculation point line to the nearest point to calculate points to the recent circular intersection coordinates and distance to calculate two line segments a total of the intersection, for a segment, or the linear and circular intersection, the convex hull for France and so on, with the aid of diagrams