The ArcGIS Mobile SDK includes a set of Geometry components that you can use to create and update the shape of features, perform spatial selections, and draw graphics on the map display. The geometry components are responsible for handling the shape

一种快速计算图形凸包的算法，算法比较简单，实现起来也很容易，有兴趣的可以参阅一下。-A fast algorithm to calculate the graphics convex hull algorithm is relatively simple, and is also very easy to implement, are interested can see what.