50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
#!/usr/bin/python
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import initExample ## Add path to library (just for examples; you do not need this)
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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("Infinite Line Performance")
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p = pg.plot()
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p.setWindowTitle('pyqtgraph performance: InfiniteLine')
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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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# Add a large number of horizontal InfiniteLine to plot
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for i in range(100):
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line = pg.InfiniteLine(pos=np.random.randint(5000), movable=True)
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p.addItem(line)
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data = np.random.normal(size=(50, 5000))
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ptr = 0
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lastTime = perf_counter()
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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 = perf_counter()
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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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if __name__ == '__main__':
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pg.exec()
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