在窗口中画一条曲线，能够上下移动曲线，并且相应改变纵坐标的坐标值，在曲线旁边动态显示鼠标的纵坐标值-In the window, drawing a curve, it is possible to vertically move the curve, and the corresponding change in the vertical coordinates of the coordinate values ​ ​ on the curve next to the ve