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Diffstat (limited to 'examples/plotUpdateCurveFromThread.py')
-rw-r--r-- | examples/plotUpdateCurveFromThread.py | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/examples/plotUpdateCurveFromThread.py b/examples/plotUpdateCurveFromThread.py new file mode 100644 index 0000000..a36e5ee --- /dev/null +++ b/examples/plotUpdateCurveFromThread.py @@ -0,0 +1,104 @@ +# coding: utf-8 +# /*########################################################################## +# +# Copyright (c) 2017-2018 European Synchrotron Radiation Facility +# +# Permission is hereby granted, free of charge, to any person obtaining a copy +# of this software and associated documentation files (the "Software"), to deal +# in the Software without restriction, including without limitation the rights +# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +# copies of the Software, and to permit persons to whom the Software is +# furnished to do so, subject to the following conditions: +# +# The above copyright notice and this permission notice shall be included in +# all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +# THE SOFTWARE. +# +# ###########################################################################*/ +"""This script illustrates the update of a :mod:`silx.gui.plot` widget from a thread. + +The problem is that plot and GUI methods should be called from the main thread. +To safely update the plot from another thread, one need to execute the update +asynchronously in the main thread. +In this example, this is achieved with +:func:`~silx.gui.utils.concurrent.submitToQtMainThread`. + +In this example a thread calls submitToQtMainThread to update the curve +of a plot. +""" + +__authors__ = ["T. Vincent"] +__license__ = "MIT" +__date__ = "05/09/2017" + + +import threading +import time + +import numpy + +from silx.gui import qt +from silx.gui.utils import concurrent + +from silx.gui.plot import Plot1D + + +class UpdateThread(threading.Thread): + """Thread updating the curve of a :class:`~silx.gui.plot.Plot1D` + + :param plot1d: The Plot1D to update.""" + + def __init__(self, plot1d): + self.plot1d = plot1d + self.running = False + super(UpdateThread, self).__init__() + + def start(self): + """Start the update thread""" + self.running = True + super(UpdateThread, self).start() + + def run(self): + """Method implementing thread loop that updates the plot""" + while self.running: + time.sleep(1) + # Run plot update asynchronously + concurrent.submitToQtMainThread( + self.plot1d.addCurve, + numpy.arange(1000), + numpy.random.random(1000), + resetzoom=False) + + def stop(self): + """Stop the update thread""" + self.running = False + self.join(2) + + +def main(): + global app + app = qt.QApplication([]) + + # Create a Plot1D, set its limits and display it + plot1d = Plot1D() + plot1d.setLimits(0., 1000., 0., 1.) + plot1d.show() + + # Create the thread that calls submitToQtMainThread + updateThread = UpdateThread(plot1d) + updateThread.start() # Start updating the plot + + app.exec_() + + updateThread.stop() # Stop updating the plot + + +if __name__ == '__main__': + main() |