app = pg.QtGui.QApplication([])

win = pg.GraphicsWindow(title="数据滚动")

win.resize(600,300)

p = win.addPlot()

# Use automatic downsampling and clipping to reduce the drawing load

p.setDownsampling(mode='peak')

p.setClipToView(True)

curve = p.plot()

data = np.empty(100)

ptr = 0

def update():

    global data, ptr

    data[ptr] = np.random.normal()

    ptr += 1

    if ptr >= data.shape[0]: #当ptr大于等于data的长度时，改变data的长度

        tmp = data

        data = np.empty(data.shape[0] * 2)

        data[:tmp.shape[0]] = tmp

    curve.setData(data[:ptr])

timer = QtCore.QTimer()

timer.timeout.connect(update)

timer.start(100)

app.exec_()

app = pg.QtGui.QApplication([])

win = pg.GraphicsWindow(title="数据滚动")

win.resize(600,300)

p = win.addPlot()

# Use automatic downsampling and clipping to reduce the drawing load

p.setDownsampling(mode='peak')

p.setClipToView(True)

p.setRange(xRange=[-100,0])#将横坐标的范围限定为[-100,0]

p.setLimits(xMax=0)# 横坐标的最大值为0

curve = p.plot()

data = np.empty(100)

ptr = 0

def update():

    global data, ptr

    data[ptr] = np.random.normal()

    ptr += 1

    if ptr >= data.shape[0]:

        tmp = data

        data = np.empty(data.shape[0] * 2)

        data[:tmp.shape[0]] = tmp

    curve.setData(data[:ptr])

    curve.setPos(-ptr, 0)#

timer = QtCore.QTimer()

timer.timeout.connect(update)

timer.start(100)

app.exec_()