曲线显示的类，可以一次显示多条曲线，曲线的周期可调，可以放大显示区域，可以实现当鼠标点在显示区域里的动态显示。-Curve display can display the curve, the curve of the cycle multiple adjustable, you can zoom the display area can be achieved when the mouse point in the display area in the dynamic display.