利用QT读取单片机发送的串口数据，并实时显示心电波形图。子线程接收数据，主线程画图(Using QT to read the serial data sent by single chip microcomputer and display the ECG waveform in real time. Zi Xiancheng receives data, master thread drawing)

汽车虚拟仪表的简单演示，采用Qpainter类，绘制汽车虚拟仪表的动态显示(Simple demonstration of automobile virtual instrument)