I am interested in using RemoteGraphicsView to see if it speeds up the
refresh rate on some sensor data I am getting and plotting as scatter plots
( see this thread for my example program
<https://github.com/pyqtgraph/pyqtgraph/issues/2396> ). To start, I am
trying to just modify the RemoteSpeedTest.py file to use ScatterPlotItem's
instead of PlotDataItem. However, it does not seem to work. My
understanding is the .plot() method of PlotItem creates a PlotDataItem and
renders it (with the clear keyword clearing the previous PlotDataItem). I
naively just use the additem() method to add an explicitly created
ScatterPlotItem. This results in a pickle error:
TypeError: cannot pickle 'ScatterPlotItem' object
How should one use RemoteGraphicsView to create a scatter plot? Also, the
local plot doesn't event work -- I assume because the explicit clear
deletes the ScatterPlotItem before it is rendered? Is there a better way to
clear the plot or force it to render before the lplt.clear() call? My
modified RemoteSpeedTest.py is below.
Thanks,
Zach
from time import perf_counter
import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtWidgets
app = pg.mkQApp()
view = pg.widgets.RemoteGraphicsView.RemoteGraphicsView()
pg.setConfigOptions(antialias=True)
view.pg.setConfigOptions(antialias=True)
view.setWindowTitle('pyqtgraph example: RemoteSpeedTest')
app.aboutToQuit.connect(view.close)
label = QtWidgets.QLabel()
rcheck = QtWidgets.QCheckBox('plot remote')
rcheck.setChecked(False) # It throws errors so disable.
lcheck = QtWidgets.QCheckBox('plot local')
lplt = pg.PlotWidget()
layout = pg.LayoutWidget()
layout.addWidget(rcheck)
layout.addWidget(lcheck)
layout.addWidget(label)
layout.addWidget(view, row=1, col=0, colspan=3)
layout.addWidget(lplt, row=2, col=0, colspan=3)
layout.resize(800,800)
layout.show()
rplt = view.pg.PlotItem()
rplt._setProxyOptions(deferGetattr=True)
view.setCentralItem(rplt)
lastUpdate = perf_counter()
avgFps = 0.0
def update():
global check, label, plt, lastUpdate, avgFps, rpltfunc
data = np.random.normal(size=(10000,50)).sum(axis=1)
data += 5 * np.sin(np.linspace(0, 10, data.shape[0]))
x = np.arange(len(data)) # Make explicit x data
if rcheck.isChecked():
# OLD:
# rplt.plot(data, clear=True, _callSync='off')
# rplt.plot() adds a plot item and clears, so make a ScatterPlotItem
# and clear manually. This doesn't work.
rplt.addItem(pg.ScatterPlotItem(x=x, y=data, _callSync='off'))
rplt.clear()
if lcheck.isChecked():
# OLD:
# lplt.plot(data, clear=True)
# Nothing even displays here, does it clear before it renders?
lplt.addItem(pg.ScatterPlotItem(x=x, y=data))
lplt.clear()
now = perf_counter()
fps = 1.0 / (now - lastUpdate)
lastUpdate = now
avgFps = avgFps * 0.8 + fps * 0.2
label.setText("Generating %0.2f fps" % avgFps)
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)
if __name__ == '__main__':
pg.exec()
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