用C语言写的近三十个几何处理函数，包括求教，判断包含等，实现GIS空间分析功能时可以参考-C language written in the past 30 geometric handling functions, including pay him, the judge included. GIS spatial analysis functions can reference

某控制系统的开环传递函数的分析,绘制系统的闭环根轨迹-An open-loop transfer function of the control system of the analysis of the drawing system of closed loop root locus