pyqtgraph/examples/MultiPlotSpeedTest.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
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"""
Test the speed of rapidly updating multiple plot curves
"""
## Add path to library (just for examples; you do not need this)
import initExample
from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
from pyqtgraph.ptime import time
app = pg.mkQApp("MultiPlot Speed Test")
plot = pg.plot()
plot.setWindowTitle('pyqtgraph example: MultiPlotSpeedTest')
plot.setLabel('bottom', 'Index', units='B')
nPlots = 100
nSamples = 500
curves = []
for idx in range(nPlots):
curve = pg.PlotCurveItem(pen=(idx,nPlots*1.3))
plot.addItem(curve)
curve.setPos(0,idx*6)
curves.append(curve)
plot.setYRange(0, nPlots*6)
plot.setXRange(0, nSamples)
plot.resize(600,900)
rgn = pg.LinearRegionItem([nSamples/5.,nSamples/3.])
plot.addItem(rgn)
data = np.random.normal(size=(nPlots*23,nSamples))
ptr = 0
lastTime = time()
fps = None
count = 0
def update():
global curve, data, ptr, plot, lastTime, fps, nPlots, count
count += 1
for i in range(nPlots):
curves[i].setData(data[(ptr+i)%data.shape[0]], skipFiniteCheck=True)
ptr += nPlots
now = time()
dt = now - lastTime
lastTime = now
if fps is None:
fps = 1.0/dt
else:
s = np.clip(dt*3., 0, 1)
fps = fps * (1-s) + (1.0/dt) * s
plot.setTitle('%0.2f fps' % fps)
#app.processEvents() ## force complete redraw for every plot
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)
if __name__ == '__main__':
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pg.exec()