ST_Curve是一个专业的曲线绘制控件，只要是xy坐标系的曲线，都可绘制，纵坐标只能显示为值，横坐标可以显示为值或者时间。-ST_Curve is a professional drawing curve controls, as long as xy coordinates of the curve, can be drawn, the vertical axis only shows the value, the abscissa can be shown as the value or