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-

此程序的功能为画出X，Y坐标，曲线，直线，并能对直线进行操作，而且可以对图形进行放大，缩小操作-The function of this procedure for the draw X, Y coordinates, curve, straight line, and is able to operate a straight line, but can also zoom in on graphics and narrow oper