pyqtgraph连续刷新波形图例子

 1 # -*- coding: utf-8 -*-#
 2 
 3 #-------------------------------------------------------------------------------
 4 # Name:         1
 5 # Description:  
 6 # Author:       Administrator
 7 # Date:         2018/5/28
 8 #-------------------------------------------------------------------------------
 9 
10 import numpy as np
11 import pyqtgraph as pg
12 
13 app = pg.mkQApp()
14 
15 win = pg.GraphicsWindow()
16 win.setWindowTitle(u‘pyqtgraph plot demo‘)
17 win.resize(600, 400)
18 
19 p = win.addPlot()
20 p.showGrid(x=True, y=True)
21 p.setLabel(axis=‘left‘, text=u‘Amplitude / V‘)
22 p.setLabel(axis=‘bottom‘, text=u‘t / s‘)
23 p.setTitle(‘y1=sin(x)  y2=cos(x)‘)
24 p.addLegend()
25 
26 curve1 = p.plot(pen=‘r‘, name=‘y1‘)
27 curve2 = p.plot(pen=‘g‘, name=‘y2‘)
28 
29 Fs = 1024.0 #采样频率
30 N = 1024    #采样点数
31 f0 = 5.0    #信号频率
32 pha = 0     #初始相位
33 t = np.arange(N) / Fs   #时间向量
34 
35 def plotData():
36     global pha
37     pha += 10
38     curve1.setData(t, np.sin(2 * np.pi * f0 * t + pha*np.pi/180.0))
39     curve2.setData(t, np.cos(2 * np.pi * f0 * t + pha*np.pi/180.0))
40 
41 timer = pg.QtCore.QTimer()
42 timer.timeout.connect(plotData)
43 timer.start(50)
44 
45 app.exec_()