graph_realtime.py 文件源码

def __init__(self, size=(600,350)):
    streams = resolve_byprop('name', 'bci', timeout=2.5)
    try:
      self.inlet = StreamInlet(streams[0])
    except IndexError:
      raise ValueError('Make sure stream name=bci is opened first.')

    self.running = True

    self.frequency = 250.0
    self.sampleinterval = (1/self.frequency)
    self.timewindow = 10
    self._bufsize = int(self.timewindow/self.sampleinterval)
    self.dataBuffer = collections.deque([0.0] * self._bufsize, self._bufsize)
    self.timeBuffer = collections.deque([0.0] * self._bufsize, self._bufsize)
    self.x = np.empty(self._bufsize,dtype='float64')
    self.y = np.empty(self._bufsize,dtype='float64')
    self.app = QtGui.QApplication([])
    self.plt = pg.plot(title='EEG data from OpenBCI')
    self.plt.resize(*size)
    self.plt.showGrid(x=True,y=True)
    self.plt.setLabel('left','Amplitude','V')
    self.plt.setLabel('bottom','Time','s')
    self.curve = self.plt.plot(self.x,self.y,pen=(255,0,0))
    self.sample = np.zeros(8)
    self.timestamp = 0.0

    #QTimer
    self.timer = QtCore.QTimer()
    self.timer.timeout.connect(self.update)
    self.timer.start(self.sampleinterval)