mplwidget.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

#from PyQt4.QtGui import *
#from PyQt4.QtCore import *
from qgis.PyQt.QtGui import *
from qgis.PyQt.QtWidgets import *

from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):
    def __init__(self):
        self.fig = Figure()
        self.ax = self.fig.add_subplot(111)
        FigureCanvas.__init__(self, self.fig)
        FigureCanvas.setSizePolicy(self, QSizePolicy.Expanding,
                                   QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

class Mplwidget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        self.canvas = MplCanvas()
        self.navBar = NavigationToolbar(self.canvas, self)
        self.vbl = QVBoxLayout()
        self.vbl.addWidget(self.canvas)
        self.vbl.addWidget(self.navBar)
        self.setLayout(self.vbl)