凸包算法，根据鼠标点出来的点来画凸多边形。-Convex hull algorithm, according to the mouse point to draw out of the convex polygon.

在c++下，根据点数据画出泰森多边形，并且根据高程填色(In c++, according to the data to draw the Tyson polygon, and according to the elevation of coloring)