Implementing QThread into code

California

Hello everybody, small example of GUI with actual time showing and button for calling the graph is here.
When code is runing actual time is showing and it is updated every second, when button is pressed new window with graph is appeared (some prepared buffer data), but updating of the time on the main GUI is stopped. I would be very pleassed if someone can help me to solve this problem.
main.py

import gui
import sys
import datetime
from graph import simple_graph
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import QTimer


if __name__ == "__main__":

    app = QtGui.QApplication(sys.argv)

    def time_show():
        now = datetime.datetime.now()
        master.Time.setText(now.strftime("%H" + ":" + "%M" + ":" + "%S"))

    gui_master = gui.QtGui.QTabWidget()
    master = gui.Ui_Izbira()
    master.setupUi(gui_master)

    # Buttons
    master.pushButton_Graph.clicked.connect(simple_graph)

    # Timer - Trigers updating of time label every second
    timer = QTimer()
    timer.timeout.connect(time_show)
    timer.start(1000)

    gui_master.show()
    sys.exit(app.exec_())

gui.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'test.ui'
#
# Created: Sun Apr  9 08:44:41 2017
#      by: PyQt4 UI code generator 4.11.2
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Izbira(object):
    def setupUi(self, Izbira):
        Izbira.setObjectName(_fromUtf8("Izbira"))
        Izbira.resize(530, 363)
        Izbira.setWindowTitle(_fromUtf8(""))
        self.Mainpage = QtGui.QWidget()
        self.Mainpage.setObjectName(_fromUtf8("Mainpage"))
        self.Time = QtGui.QLineEdit(self.Mainpage)
        self.Time.setGeometry(QtCore.QRect(130, 70, 261, 71))
        font = QtGui.QFont()
        font.setPointSize(47)
        font.setBold(False)
        font.setItalic(True)
        font.setWeight(50)
        self.Time.setFont(font)
        self.Time.setObjectName(_fromUtf8("Time"))
        self.pushButton_Graph = QtGui.QPushButton(self.Mainpage)
        self.pushButton_Graph.setGeometry(QtCore.QRect(130, 200, 261, 31))
        self.pushButton_Graph.setObjectName(_fromUtf8("pushButton_Graph"))
        Izbira.addTab(self.Mainpage, _fromUtf8(""))

        self.retranslateUi(Izbira)
        Izbira.setCurrentIndex(0)
        QtCore.QMetaObject.connectSlotsByName(Izbira)

    def retranslateUi(self, Izbira):
        self.pushButton_Graph.setText(_translate("Izbira", "Graph", None))
        Izbira.setTabText(Izbira.indexOf(self.Mainpage), _translate("Izbira", "Main page", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Izbira = QtGui.QTabWidget()
    ui = Ui_Izbira()
    ui.setupUi(Izbira)
    Izbira.show()
    sys.exit(app.exec_())

graph.py

import matplotlib.pyplot as plt


OUT_Buffer_Zg = [0, 2, 5, 8, 7, 3, 0, 1, 10, 9, 0.5, 0,
    0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0]
OUT_Buffer_Sp = [4, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
    0, 0, 0, 0, 0, 0, 0, 3, 4, 5, 0, 0, 0, 0]

def simple_graph():
    plt.plot(OUT_Buffer_Zg, color='r', label='Zg')
    plt.plot(OUT_Buffer_Sp, color='b', label='Sp')

    plt.xlabel('Time')
    plt.ylabel('Temperature degC')
    plt.title('Temperature')
    plt.legend(bbox_to_anchor=(0., 1.02, 1., .102), loc=3,
           ncol=2, mode="expand", borderaxespad=0.)

    plt.rcParams['axes.facecolor'] = 'white'
    plt.rcParams['axes.edgecolor'] = 'white'
    plt.rcParams['grid.alpha'] = 1
    plt.rcParams['grid.color'] = "#cccccc"
    plt.grid(True)
    plt.show()

SGaist

Hi,

Matplot lib's show might be blocking your main event loop hence no update anymore.

California

Exactly, is there any workaround or should I moove with graph to diferent library?
Vlado

SGaist

Depending on your needs the QtCharts module might be enough.

However, you will likely have to change from PyQt4 to PyQt5.

California

Problem solved with mooving to PyQtGraph. Thanks for help.
Vlado

import pyqtgraph as pg


OUT_Buffer_Time = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
    13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]   # 26 spominskih mest
OUT_Buffer_Zg = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]   # 26 spominskih mest
OUT_Buffer_Sp = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]   # 26 spominskih mest

def simple_graph():
    H = pg.plot(OUT_Buffer_Time, OUT_Buffer_Zg, pen='b')
    H.plot(OUT_Buffer_Time, OUT_Buffer_Zg, pen=(255, 0, 0))
    H.plot(OUT_Buffer_Time, OUT_Buffer_Sp, pen=(0, 255, 200))