pyqtgraph逐点画波形图例子
使用python的array模块创建能够动态改变大小的数组，结合numpy中的frombuffer函数转换为numpy的数组，最后在pyqtgraph中逐点画波形图。
1 # -*- coding: utf-8 -*-# 2 3 #------------------------------------------------------------------------------- 4 # Name: pyqtgraph逐点画波形图 5 # Description: 6 # Author: lgk 7 # Date: 2018/6/2 8 #------------------------------------------------------------------------------- 9 10 import pyqtgraph as pg 11 import numpy as np 12 import array 13 14 app = pg.mkQApp() 15 16 win = pg.GraphicsWindow() 17 win.setWindowTitle(u'pyqtgraph逐点画波形图') 18 win.resize(800, 500) 19 20 data = array.array('d') #可动态改变数组的大小,double型数组 21 historyLength = 200 22 23 p = win.addPlot() 24 p.showGrid(x=True, y=True) 25 p.setRange(xRange=[0,historyLength], yRange=[-1.2, 1.2], padding=0) 26 p.setLabel(axis='left', text='y / V') 27 p.setLabel(axis='bottom', text='x / point') 28 p.setTitle('y = sin(x)') 29 30 curve = p.plot() 31 idx = 0 32 33 def plotData(): 34 global idx 35 tmp = np.sin(np.pi / 50 * idx) 36 37 if len(data)<historyLength: 38 data.append(tmp) 39 else: 40 data[:-1] = data[1:] 41 data[-1] = tmp 42 # curve.setPos(idx-historyLength, 0) 43 # p.enableAutoRange('x', True) 44 45 curve.setData(np.frombuffer(data, dtype=np.double)) 46 # curve.setData(data) #也可以 47 idx += 1 48 49 timer = pg.QtCore.QTimer() 50 timer.timeout.connect(plotData) 51 timer.start(50) 52 53 app.exec_()
