python - Functional start and stop button in a GUI using pyqt or pyside for real time data acquisition using pyqtgraph -

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i implementing program using scrollingplots example provided pyqtgraph here https://github.com/skycaptain/gazetrack/blob/master/gui/pyqtgraph/examples/scrollingplots.py

import pyqtgraph pg pyqtgraph.qt import qtcore, qtgui import numpy np  win = pg.graphicswindow() win.setwindowtitle('pyqtgraph example: scrolling plots') win.nextrow() p3 = win.addplot() p4 = win.addplot() # use automatic downsampling , clipping reduce drawing load p3.setdownsampling(mode='peak') p4.setdownsampling(mode='peak') p3.setcliptoview(true) p4.setcliptoview(true) p3.setrange(xrange=[-100, 0]) p3.setlimits(xmax=0) curve3 = p3.plot() curve4 = p4.plot()  data3 = np.empty(100) ptr3 = 0  def update2():     global data3, ptr3     data3[ptr3] = np.random.normal()     ptr3 += 1     if ptr3 >= data3.shape[0]:         tmp = data3         data3 = np.empty(data3.shape[0] * 2)         data3[:tmp.shape[0]] = tmp     curve3.setdata(data3[:ptr3])     curve3.setpos(-ptr3, 0)     curve4.setdata(data3[:ptr3])  # update plots  timer = pg.qtcore.qtimer() timer.timeout.connect(update3) timer.start(50)  ## start qt event loop unless running in interactive mode or using pyside. if __name__ == '__main__':     import sys     if (sys.flags.interactive != 1) or not hasattr(qtcore, 'pyqt_version'):         qtgui.qapplication.instance().exec_()

at first wanted use ctrl+c signal stop continuous data plotting , save data obtained file. however, way quit program close graph window. executing ctrl+c in terminal not anything.

therefore, implement button start , stop(and save data) in program.

as newbie in python , object oriented programming, looked examples online. have found examples button implementation in gui:

  • stackoverflow.com/questions/8762870/how-to-implement-a-simple-button-in-pyqt

  • groups.google.com/forum/#!topic/pyqtgraph/bxvzhtb1kkg

  • www.youtube.com/watch?v=z33vwdhrafm , gui related tutorials youtuber

none of these examples have aided me in achieving want not know how combine them scrollingplots example.

from qt crash course webpage (pyqtgraph.org/documentation/qtcrashcourse.html): 

from pyqt4 import qtgui  # (the example applies equally pyside) import pyqtgraph pg  ## start initializing qt (only once per application) app = qtgui.qapplication([])  ## define top-level widget hold w = qtgui.qwidget()  ## create widgets placed inside btn = qtgui.qpushbutton('press me') text = qtgui.qlineedit('enter text') listw = qtgui.qlistwidget() plot = pg.plotwidget()  ## create grid layout manage widgets size , position layout = qtgui.qgridlayout() w.setlayout(layout)  ## add widgets layout in proper positions layout.addwidget(btn, 0, 0)   # button goes in upper-left layout.addwidget(text, 1, 0)   # text edit goes in middle-left layout.addwidget(listw, 2, 0)  # list widget goes in bottom-left layout.addwidget(plot, 0, 1, 3, 1)  # plot goes on right side, spanning 3 rows  ## display widget new window w.show()  ## start qt event loop app.exec_()

as there app.exec_() @ end of of button example codes , there , update loop in scrollingplot example itself, confused how can run @ same time.

i have read somewhere regarding such using gui continuously running process, should consider using timer or multithreading. nevertheless, presently not have knowledge in threading.

i have tried tkinter found guide on how use tkinter matplotlib -> pythonprogramming.net/how-to-embed-matplotlib-graph-tkinter-gui/

looking forward receiving advice regarding problem.

from pyqt4 import qtcore, qtgui import pyqtgraph pg  class mainform(qtgui.qmainwindow):     def __init__(self):         super(mainform, self).__init__()         self.playtimer = qtcore.qtimer()         self.playtimer.setinterval(500)         self.playtimer.timeout.connect(self.playtick)         self.toolbar = self.addtoolbar("play")         self.playscansaction = qtgui.qaction(qtgui.qicon("control_play_blue.png"), "play scans", self)         self.playscansaction.triggered.connect(self.playscanspressed)         self.playscansaction.setcheckable(true)         self.toolbar.addaction(self.playscansaction)      def playscanspressed(self):         if self.playscansaction.ischecked():             self.playtimer.start()         else:             self.playtimer.stop()      def playtick(self):         pass  def main():     app = qtgui.qapplication(sys.argv)     form = mainform()     form.initui("scan log display")     form.show()     app.exec_()  if __name__ == "__main__":     main()

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