利用VC++6.0 和OpenGL函数库绘制一个正六边形，并以该六边形的各边中点为顶点依次继续绘制正六边形，然后依次迭代，要求能够控制迭代次数,并且线条颜色循环为红绿蓝三种颜色。-To utilize VC++6.0 and OpenGL libraries to draw a regular hexagon vertex to the midpoint of each side of the hexagon in turn continue to draw a regular hexagon, followed by iterative, requires the ability to control the number of iterations, and the line color cycle for red green, blue three colors.