现有一硬件采集了人在一固定大小的平面上的压力中心点，采集了很多数据，现在要求用vb算出一组压力中心点的凸包，以便显示人在这一时段的活动范围-A collection of existing hardware in a fixed plane the size of the center of pressure, a lot of data collection, and now requires a set of pressure vb calculate the center of the convex hull in order to display the time in the scope of activities