69 lines
1.6 KiB
Python
69 lines
1.6 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""
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Test the speed of rapidly updating multiple plot curves
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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 time import perf_counter
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# pg.setConfigOptions(useOpenGL=True)
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app = pg.mkQApp("MultiPlot Speed Test")
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plot = pg.plot()
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plot.setWindowTitle('pyqtgraph example: MultiPlotSpeedTest')
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plot.setLabel('bottom', 'Index', units='B')
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nPlots = 100
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nSamples = 500
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curves = []
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for idx in range(nPlots):
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curve = pg.PlotCurveItem(pen=({'color': (idx, nPlots*1.3), 'width': 1}), skipFiniteCheck=True)
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plot.addItem(curve)
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curve.setPos(0,idx*6)
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curves.append(curve)
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plot.setYRange(0, nPlots*6)
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plot.setXRange(0, nSamples)
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plot.resize(600,900)
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rgn = pg.LinearRegionItem([nSamples/5.,nSamples/3.])
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plot.addItem(rgn)
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data = np.random.normal(size=(nPlots*23,nSamples))
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ptr = 0
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lastTime = perf_counter()
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fps = None
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count = 0
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def update():
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global curve, data, ptr, plot, lastTime, fps, nPlots, count
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count += 1
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for i in range(nPlots):
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curves[i].setData(data[(ptr+i)%data.shape[0]])
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ptr += nPlots
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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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plot.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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