text: from ..Qt import QtGui, QtCore, QT_LIB
  import matplotlib
  
  from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
  from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
  
  from matplotlib.figure import Figure
  
  __all__ = ['MatplotlibWidget']
  
  class MatplotlibWidget(QtGui.QWidget):
      """
      Implements a Matplotlib figure inside a QWidget.
      Use getFigure() and redraw() to interact with matplotlib.
      
      Example::
      
          mw = MatplotlibWidget()
          subplot = mw.getFigure().add_subplot(111)
          subplot.plot(x,y)
          mw.draw()
      """
      
      def __init__(self, size=(5.0, 4.0), dpi=100):
          QtGui.QWidget.__init__(self)
          self.fig = Figure(size, dpi=dpi)
          self.canvas = FigureCanvas(self.fig)
          self.canvas.setParent(self)
          self.toolbar = NavigationToolbar(self.canvas, self)
          
          self.vbox = QtGui.QVBoxLayout()
          self.vbox.addWidget(self.toolbar)
          self.vbox.addWidget(self.canvas)
          
          self.setLayout(self.vbox)
  
      def getFigure(self):
          return self.fig
          
      def draw(self):
          self.canvas.draw()
  