Thank you for all of your explanation and examples, it's work Pada Rabu, 16 Mei 2018 00.16.28 UTC+7, Jeremy Webster menulis: > > To add to Luke's point > > 1. I suspect you should use QThread instead of python's threading.Thread, > since QThread will provide signals and slots that will easily allow the > thread to communicate back and forth with the GUI. > > 2. Some tutorials will tell you to subclass QThread, but that seems to be > bad advice, the correct way is to create a worker object, then add it to a > QThread. > > 3. (For a C++ based explanation, but one that applies to pyqt as well > https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/ > > ) > > 4. For a pyqt4 example, check out Matthew Levine's solution in this > stackoverflow post... ( > https://stackoverflow.com/questions/6783194/background-thread-with-qthread-in-pyqt? > > ) > > > > On Tuesday, May 15, 2018 at 9:55:52 AM UTC-6, Jan Sebastian wrote: >> >> I write an application that displays random number in real time graph, it >> run perfectly on windows but when I try it on raspberry pi it alwarys stop >> updating the graph, but the proses in the python shell is still running >> generate a rundom number and the program didn't. >> >> Any idea, how to fix it? >> >> the example of my code: >> >> >> from PyQt4 import QtCore,QtGui,uic >> from PyQt4.QtCore import QTime, QTimer >> import sys >> import time >> import threading >> from pyqtgraph import ViewBox, PlotWidget >> #import pyqtgraph as pg >> from pyqtgraph.Qt import QtCore, QtGui >> import numpy as np >> from blupblupshub import BlumBlumShub >> from TimeAxisItem import TimeAxisItem >> from collections import deque >> import random >> >> >> qtCreatorFile = "mejaGetar2.ui" >> >> >> Ui_MainWindow,QtBaseClass = uic.loadUiType(qtCreatorFile) >> >> class MyApp(QtGui.QTabWidget,Ui_MainWindow): >> akselerasi = 0 >> threads = [] >> threads2 = [] >> varGraph1 = object >> aa = False >> def __init__(self): >> >> QtGui.QTabWidget.__init__(self) >> Ui_MainWindow.__init__(self) >> self.setupUi(self) >> self.akselerasi.setMinimum(0) >> self.akselerasi.setMaximum(30) >> self.akselerasi.setValue(0) >> >> self.akselerasi.sliderReleased.connect(self.getThread) >> self.graph1.setRange(xRange=None, yRange=[-1, 1 ]) >> self.graph1.setLabel('bottom', 'time', 's') >> self.graph1.showGrid(x=True, y=True) >> #self.graph1.setLab('bottom',TimeAxisItem(orientation='bottom')) >> self.graph1.setMouseEnabled(x=False, y=False) >> MyApp.varGraph1 = self.graph1 >> >> self.l1.setText(str(self.akselerasi.value())) >> #self.currentChanged.connect(self.forceCloseThread) >> >> >> def getThread(self): >> >> if self.sender() == self.akselerasi: >> MyApp.akselerasii = int(self.akselerasi.value()) >> >> if MyApp.akselerasii > 0: >> >> thread1 = DynamicThread("akselerasi") >> >> if MyApp.aa == True: >> print("second") >> minRange = int(self.akselerasi.value()) * -1 >> self.graph1.setRange(xRange=None, yRange=[minRange, >> int(self.akselerasi.value()) ]) >> thread1.trigrer(MyApp.akselerasii) >> >> else: >> thread1.trigrer(MyApp.akselerasii) >> MyApp.threads2.append(thread1) >> minRange = int(self.akselerasi.value()) * -1 >> self.graph1.setRange(xRange=None, yRange=[minRange, >> int(self.akselerasi.value()) ]) >> MyApp.aa = True >> >> print("first") >> thread1.start() >> else: >> for t in MyApp.threads2: >> MyApp.aa = False >> t.stop() >> self.graph1.clear() >> >> >> class DynamicThread(threading.Thread,MyApp): >> intAkselerasi = 0 >> ruuun = False >> >> def __init__(self,sub): >> threading.Thread.__init__(self) >> >> self.subject = sub >> >> def trigrer(self,num): >> DynamicThread.intAkselerasi = num >> >> def run(self): >> listData = [] >> a = 0 >> count = 0 >> test = 0 >> t = QTime() >> t.start() >> dataGraph = deque(maxlen=20) >> x1 = [] >> y1 = [] >> >> print("starting " + self.subject) >> dynamicGenerator = BlumBlumShub() >> curve = MyApp.varGraph1.plot(pen=(255,0,0)) >> while DynamicThread.ruuun == True: >> if DynamicThread.intAkselerasi > 0: >> minus = DynamicThread.intAkselerasi *-1 >> data = random.randint(minus,DynamicThread.intAkselerasi) >> >> dataGraph.append({'x': t.elapsed(), 'y': data}) >> x1 = [item['x'] for item in dataGraph] >> y1 = [item['y'] for item in dataGraph] >> curve.setData(x=x1, y=y1) >> print("test: ",data) >> print("\n") >> a = a + 1 >> >> time.sleep(0.5) >> >> else: >> DynamicThread.ruuun = False >> print("stop") >> break >> print("stoping " + self.subject) >> dataGraph = [] >> x1 = [] >> y1 = [] >> >> def start(self): >> DynamicThread.ruuun = True >> super(DynamicThread,self).start() >> >> def stop(self): >> DynamicThread.ruuun = False >> >> if __name__ == "__main__": >> app = QtGui.QApplication(sys.argv) >> window = MyApp() >> window.show() >> sys.exit(app.exec_()) >> >> >> >>
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