切线法 meaning in English

tangent method
tangents method

During the process of obstacle expression , geometrical predigestions and improvements are carried out with the structure characters of obstacle polygon . a new method of vertex judgement - tangent way is proposed during polygon vertex judgement in this paper . it conquers the limitation of traditional plans , which is the same with either obstacle vertex judgement
在障碍物表达中,研究了障碍物多边形的构造,并对其进行了几何简化和改进;针对多边形顶点判断问题,提出了一种新的顶点判别法?切线法,该方法克服了传统法的缺陷,对任一障碍物都适用。