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_()
以上的图形中包含从“0”时刻开始的所有数据，随着数据的不断增加，坐标也随之变化。
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_()
原文：https://www.cnblogs.com/conpi/p/12242701.html