81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""
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For testing rapid updates of ScatterPlotItem under various conditions.
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(Scatter plots are still rather slow to draw; expect about 20fps)
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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, QT_LIB
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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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#QtGui.QApplication.setGraphicsSystem('raster')
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app = pg.mkQApp("Scatter Plot Speed Test")
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#mw = QtGui.QMainWindow()
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#mw.resize(800,800)
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import importlib
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ui_template = importlib.import_module(
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f'ScatterPlotSpeedTestTemplate_{QT_LIB.lower()}')
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win = QtGui.QWidget()
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win.setWindowTitle('pyqtgraph example: ScatterPlotSpeedTest')
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ui = ui_template.Ui_Form()
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ui.setupUi(win)
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win.show()
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p = ui.plot
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p.setRange(xRange=[-500, 500], yRange=[-500, 500])
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count = 500
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data = np.random.normal(size=(50,count), scale=100)
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sizeArray = (np.random.random(count) * 20.).astype(int)
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brushArray = [pg.mkBrush(x) for x in np.random.randint(0, 256, (count, 3))]
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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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p.clear()
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if ui.randCheck.isChecked():
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size = sizeArray
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brush = brushArray
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else:
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size = ui.sizeSpin.value()
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brush = 'b'
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curve = pg.ScatterPlotItem(x=data[ptr % 50], y=data[(ptr+1) % 50],
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pen='w', brush=brush, size=size,
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pxMode=ui.pixelModeCheck.isChecked())
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p.addItem(curve)
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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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p.repaint()
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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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