matplotlib实现根据实时数据动态更新图形

一 代码

1. from time import sleep
2. from threading importThread
3. import numpy as np
4. import matplotlib.pyplot as plt
5. from matplotlib.widgets importButton
7. fig, ax = plt.subplots()
8. #设置图形显示位置
9. plt.subplots_adjust(bottom=0.2)
10. #实验数据
11. range_start, range_end, range_step =0,1,0.005
12. t = np.arange(range_start, range_end, range_step)
13. s = np.sin(4*np.pi*t)
14. l,= plt.plot(t, s, lw=2)
15. #自定义类，用来封装两个按钮的单击事件处理函数
16. classButtonHandler:
17. def __init__(self):
18. self.flag =True
19. self.range_s, self.range_e, self.range_step =0,1,0.005
20. #线程函数，用来更新数据并重新绘制图形
21. def threadStart(self):
22. while self.flag:
23. sleep(0.02)
24. self.range_s += self.range_step
25. self.range_e += self.range_step
26. t = np.arange(self.range_s, self.range_e, self.range_step)
27. ydata = np.sin(4*np.pi*t)
28. #更新数据
29. l.set_xdata(t-t[0])
30. l.set_ydata(ydata)
31. #重新绘制图形
32. plt.draw()
33. defStart(self, event):
34. self.flag =True
35. #创建并启动新线程
36. t =Thread(target=self.threadStart)
37. t.start()
38. defStop(self, event):
39. self.flag =False
41. callback =ButtonHandler()
42. #创建按钮并设置单击事件处理函数
43. axprev = plt.axes([0.81,0.05,0.1,0.075])
44. bprev =Button(axprev,'Stop')
45. bprev.on_clicked(callback.Stop)
46. axnext = plt.axes([0.7,0.05,0.1,0.075])
47. bnext =Button(axnext,'Start')
48. bnext.on_clicked(callback.Start)
50. plt.show()

二 运行结果