说明：  用VB开发工控软件(HMI)时，经常需要对工艺参数进行趋势曲线的显示，这通常需要使用控件来实现，自然有第三方提供的控件，但那是需要付费的，并且有的使用情况并不理想，自己开发的话又差强人意，这里提供一个实时曲线显示的程序，给大家以启发。通过对程序的修改，可以很方便的应用到实际工程中去
(VB-industrial control software (HMI), we often need to process parameters for the display of the trend curve, which usually need to use the controls to achieve natural control provided by a third party, but that is the need to pay, and some use situation is not ideal, but passable if their development, here is a real-time curve shows the procedure to you to inspire. Through the process of change, can be easily applied to practical engineering to)