58 lines
1.4 KiB
Python
58 lines
1.4 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 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 pyqtgraph.ptime import time
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app = QtGui.QApplication([])
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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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#curve.setFillBrush((0, 0, 100, 100))
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#curve.setFillLevel(0)
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#lr = pg.LinearRegionItem([100, 4900])
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#p.addItem(lr)
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data = np.random.normal(size=(50,5000))
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ptr = 0
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lastTime = time()
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fps = None
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def update():
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global curve, data, ptr, p, lastTime, fps
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curve.setData(data[ptr%10])
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ptr += 1
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now = time()
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dt = now - lastTime
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lastTime = now
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if fps is None:
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fps = 1.0/dt
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else:
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s = np.clip(dt*3., 0, 1)
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fps = fps * (1-s) + (1.0/dt) * s
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p.setTitle('%0.2f fps' % fps)
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app.processEvents() ## force complete redraw for every plot
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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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## Start Qt event loop unless running in interactive mode.
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if __name__ == '__main__':
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import sys
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if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
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QtGui.QApplication.instance().exec_()
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