pyqtgraph/examples/MultiPlotSpeedTest.py
Luke Campagnola 491aee0fe2 python3 fixes
cleaned up examples
2013-02-24 23:09:03 -05:00

69 lines
1.7 KiB
Python

#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
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
#QtGui.QApplication.setGraphicsSystem('raster')
app = QtGui.QApplication([])
#mw = QtGui.QMainWindow()
#mw.resize(800,800)
p = pg.plot()
p.setWindowTitle('pyqtgraph example: MultiPlotSpeedTest')
#p.setRange(QtCore.QRectF(0, -10, 5000, 20))
p.setLabel('bottom', 'Index', units='B')
nPlots = 10
#curves = [p.plot(pen=(i,nPlots*1.3)) for i in range(nPlots)]
curves = [pg.PlotCurveItem(pen=(i,nPlots*1.3)) for i in range(nPlots)]
for c in curves:
p.addItem(c)
rgn = pg.LinearRegionItem([1,100])
p.addItem(rgn)
data = np.random.normal(size=(53,5000/nPlots))
ptr = 0
lastTime = time()
fps = None
count = 0
def update():
global curve, data, ptr, p, lastTime, fps, nPlots, count
count += 1
#print "---------", count
for i in range(nPlots):
curves[i].setData(i+data[(ptr+i)%data.shape[0]])
#print " setData done."
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
p.setTitle('%0.2f fps' % fps)
#app.processEvents() ## force complete redraw for every plot
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)
## Start Qt event loop unless running in interactive mode.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()