8000 Qt embedding example: Separate drawing and data retrieval timers by doronbehar · Pull Request #28589 · matplotlib/matplotlib · GitHub
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Qt embedding example: Separate drawing and data retrieval timers #28589

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Merged
merged 2 commits into from
Aug 5, 2024
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Qt embedding example: Separate drawing and data retrieval timers #28589

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Qt embedding example: Separate drawing and data retrieval timers
doronbehar Jul 18, 2024
a46ecad
Rename _update_data to _update_ydata
timhoffm Aug 5, 2024
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34 changes: 25 additions & 9 deletions galleries/examples/user_interfaces/embedding_in_qt_sgskip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,18 +44,34 @@ def __init__(self):
self._static_ax.plot(t, np.tan(t), ".")

self._dynamic_ax = dynamic_canvas.figure.subplots()
t = np.linspace(0, 10, 101)
# Set up a Line2D.
self._line, = self._dynamic_ax.plot(t, np.sin(t + time.time()))
self._timer = dynamic_canvas.new_timer(50)
self._timer.add_callback(self._update_canvas)
self._timer.start()
self.xdata = np.linspace(0, 10, 101)
self._update_ydata()
self._line, = self._dynamic_ax.plot(self.xdata, self.ydata)
# The below two timers must be attributes of self, so that the garbage
# collector won't clean them after we finish with __init__...

def _update_canvas(self):
t = np.linspace(0, 10, 101)
# The data retrieval may be fast as possible (Using QRunnable could be
# even faster).
self.data_timer = dynamic_canvas.new_timer(1)
self.data_timer.add_callback(self._update_ydata)
self.data_timer.start()
# Drawing at 50Hz should be fast enough for the GUI to feel smooth, and
# not too fast for the GUI to be overloaded with events that need to be
# processed while the GUI element is changed.
self.drawing_timer = dynamic_canvas.new_timer(20)
self.drawing_timer.add_callback(self._update_canvas)
self.drawing_timer.start()

def _update_ydata(self):
# Shift the sinusoid as a function of time.
self._line.set_data(t, np.sin(t + time.time()))
self._line.figure.canvas.draw()
self.ydata = np.sin(self.xdata + time.time())

def _update_canvas(self):
self._line.set_data(self.xdata, self.ydata)
# It should be safe to use the synchronous draw() method for most drawing
# frequencies, but it is safer to use draw_idle().
self._line.figure.canvas.draw_idle()


if __name__ == "__main__":
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