使用PyQtGraph绘制数据滚动图形（3）

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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

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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_()