凸包最常用的凸包算法是Graham扫描法和Jarvis步进法.本程序用Graham扫描法实现凸包的绘制-convex hull of the most commonly used convex hull algorithm is scanning and Graham Jarvis stepping law. The procedures used G raham scanning method to achieve the convex hull mapping

空间分析算法的实现，包括道格拉斯算法、角度限差算法、最小凸包等-Realization of spatial analysis algorithms, including the Douglas algorithm, angle tolerances algorithm, the minimum convex hull