53 lines
1.2 KiB
Python
53 lines
1.2 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""
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Update a simple plot as rapidly as possible to measure speed.
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"""
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## Add path to library (just for examples; you do not need this)
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import initExample
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from collections import deque
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from pyqtgraph.Qt import QtGui, QtCore
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import numpy as np
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import pyqtgraph as pg
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from time import perf_counter
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app = pg.mkQApp("Plot Speed Test")
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p = pg.plot()
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p.setWindowTitle('pyqtgraph example: PlotSpeedTest')
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p.setRange(QtCore.QRectF(0, -10, 5000, 20))
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p.setLabel('bottom', 'Index', units='B')
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curve = p.plot()
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data = np.random.normal(size=(50, 5000))
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ptr = 0
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rollingAverageSize = 1000
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elapsed = deque(maxlen=rollingAverageSize)
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def update():
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global curve, data, ptr, elapsed, ptr
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ptr += 1
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# Measure
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t_start = perf_counter()
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curve.setData(data[ptr % 10])
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app.processEvents(QtCore.QEventLoop.ProcessEventsFlag.AllEvents)
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elapsed.append(perf_counter() - t_start)
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# update display every 50-updates
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if ptr % 50 == 0:
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average = np.mean(elapsed)
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fps = 1 / average
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p.setTitle('%0.2f fps - %0.1f ms avg' % (fps, average * 1_000))
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timer = QtCore.QTimer()
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timer.timeout.connect(update)
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timer.start(0)
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if __name__ == '__main__':
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pg.exec()
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