import pyqtgraph as pg
import numpy as np
from pyqtgraph.Qt import QtCore

app = pg.QtGui.QApplication([])
win = pg.GraphicsWindow(title="动态更新数据")
win.resize(600,300)  #设置窗口大小
p = win.addPlot()
data = np.random.random(size=50)
curve = p.plot(data)  #在坐标p中绘图并返回图形对象
def update():
    global data, curve
    data[:-1] = data[1:] 
    data[-1] = np.random.random() 
    curve.setData(data)  #给图形对象设置数据---图形对象重新绘图
timer = QtCore.QTimer()  #创建一个定时器
timer.timeout.connect(update)  #设置定时器执行函数
timer.start(100)  #启动
#参数：间隔毫秒数

app.exec_()

import pyqtgraph as pg
import numpy as np
from pyqtgraph.Qt import QtCore

app = pg.QtGui.QApplication([])
win = pg.GraphicsWindow(title="动态更新数据")
win.resize(600,300)  
p = win.addPlot()
data = np.random.random(size=50)
curve = p.plot(data)  
ptr=0
def update():
    global data, curve,ptr
    data[:-1] = data[1:] 
    data[-1] = np.random.random() 
    curve.setData(data)  
    ptr += 1
    curve.setPos(ptr, 0)  #给图形对象设置新的坐标值
    #参数1：x轴起点坐标
    #参数2：y轴起点坐标
timer = QtCore.QTimer()  
timer.timeout.connect(update)  
timer.start(100)  
app.exec_()

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