使用PyQtGraph绘制数据滚动图形（3）

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

app = pg.QtGui.QApplication([])
win = pg.GraphicsWindow(title="数据滚动")
win.resize(600,300)

p = win.addPlot()
data = np.random.random(size=50)
curve = p.plot(data)

def update():
    global data, curve
    data[:-1] = data[1:] #数据向左滚动1位，也可以用data = np.roll(data,-1)实现
    data[-1] = np.random.random() #末位更改为随机值
    curve.setData(data)

timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(100)

app.exec_()

上面的图形，数据更新后，横坐标并没有跟随新的数据做出改变，这里可以用setPos来实现

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

app = pg.QtGui.QApplication([])
win = pg.GraphicsWindow(title="数据滚动")
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:] #数据向左滚动1位，也可以用data = np.roll(data,-1)实现
    data[-1] = np.random.random() #末位更改为随机值
    curve.setData(data)
    ptr += 1
    curve.setPos(ptr,0)

timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(100)

app.exec_()