二维曲线的实现方法，用来画二维曲线 输入XY坐标即可以得到曲线图型-two-dimensional curve of the method used to draw two-dimensional curve that is the importation of XY coordinates can be curve-

opengl绘制的二位曲线图，比较适合初学者。-2 opengl drawn curve more suitable for beginners.