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# Embedding In QT5

Simple Qt5 application embedding Matplotlib canvases

Copyright (C) 2005 Florent Rougon
  2006 Darren Dale 2015 Jens H Nielsen

This file is an example program for Matplotlib. It may be used and modified with no restriction; raw copies as well as modified versions may be distributed without limitation.

    from __future__ import unicode_literals
    import sys
    import os
    import random
    import matplotlib
    # Make sure that we are using QT5
    matplotlib.use('Qt5Agg')
    # Uncomment this line before running, it breaks sphinx-gallery builds
    # from PyQt5 import QtCore, QtWidgets

    from numpy import arange, sin, pi
    from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
    from matplotlib.figure import Figure

    progname = os.path.basename(sys.argv[0])
    progversion = "0.1"

    class MyMplCanvas(FigureCanvas):
        """Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.)."""

        def __init__(self, parent=None, width=5, height=4, dpi=100):
            fig = Figure(figsize=(width, height), dpi=dpi)
            self.axes = fig.add_subplot(111)

            self.compute_initial_figure()

            FigureCanvas.__init__(self, fig)
            self.setParent(parent)

            FigureCanvas.setSizePolicy(self,
                                       QtWidgets.QSizePolicy.Expanding,
                                       QtWidgets.QSizePolicy.Expanding)
            FigureCanvas.updateGeometry(self)

        def compute_initial_figure(self):
            pass

    class MyStaticMplCanvas(MyMplCanvas):
        """Simple canvas with a sine plot."""

        def compute_initial_figure(self):
            t = arange(0.0, 3.0, 0.01)
            s = sin(2*pi*t)
            self.axes.plot(t, s)

    class MyDynamicMplCanvas(MyMplCanvas):
        """A canvas that updates itself every second with a new plot."""

        def __init__(self, *args, **kwargs):
            MyMplCanvas.__init__(self, *args, **kwargs)
            timer = QtCore.QTimer(self)
            timer.timeout.connect(self.update_figure)
            timer.start(1000)

        def compute_initial_figure(self):
            self.axes.plot([0, 1, 2, 3], [1, 2, 0, 4], 'r')

        def update_figure(self):
            # Build a list of 4 random integers between 0 and 10 (both inclusive)
            l = [random.randint(0, 10) for i in range(4)]
            self.axes.cla()
            self.axes.plot([0, 1, 2, 3], l, 'r')
            self.draw()

    class ApplicationWindow(QtWidgets.QMainWindow):
        def __init__(self):
            QtWidgets.QMainWindow.__init__(self)
            self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
            self.setWindowTitle("application main window")

            self.file_menu = QtWidgets.QMenu('&File', self)
            self.file_menu.addAction('&Quit', self.fileQuit,
                                     QtCore.Qt.CTRL + QtCore.Qt.Key_Q)
            self.menuBar().addMenu(self.file_menu)

            self.help_menu = QtWidgets.QMenu('&Help', self)
            self.menuBar().addSeparator()
            self.menuBar().addMenu(self.help_menu)

            self.help_menu.addAction('&About', self.about)

            self.main_widget = QtWidgets.QWidget(self)

            l = QtWidgets.QVBoxLayout(self.main_widget)
            sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100)
            dc = MyDynamicMplCanvas(self.main_widget, width=5, height=4, dpi=100)
            l.addWidget(sc)
            l.addWidget(dc)

            self.main_widget.setFocus()
            self.setCentralWidget(self.main_widget)

            self.statusBar().showMessage("All hail matplotlib!", 2000)

        def fileQuit(self):
            self.close()

        def closeEvent(self, ce):
            self.fileQuit()

        def about(self):
            QtWidgets.QMessageBox.about(self, "About",
                                        """embedding_in_qt5.py example
    Copyright 2005 Florent Rougon, 2006 Darren Dale, 2015 Jens H Nielsen

    This program is a simple example of a Qt5 application embedding matplotlib
    canvases.

    It may be used and modified with no restriction; raw copies as well as
    modified versions may be distributed without limitation.

    This is modified from the embedding in qt4 example to show the difference
    between qt4 and qt5"""
                                    )

    qApp = QtWidgets.QApplication(sys.argv)

    aw = ApplicationWindow()
    aw.setWindowTitle("%s" % progname)
    aw.show()
    sys.exit(qApp.exec_())
    #qApp.exec_()

Total running time of the script: ( 0 minutes 0.000 seconds)

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