一个简单的串口画图程序，将串口接收到的数据画成折线图，算是一种画图方法-Serial drawing, the serial port to receive the data is plotted

可以实现基本的绘制图形的功能，是一个类似于简单画图工具的小程序。(Can achieve the basic function of drawing graphics, is a simple drawing tool similar to the small program.)