Matplotlib グラフを PyQt4 インターフェイス内に埋め込む方法?

<code class="python">import sys
from PyQt4 import QtGui

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg, NavigationToolbar2QT
from matplotlib.figure import Figure</code>

<code class="python">class Window(QtGui.QDialog):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)

        # Create a Figure instance for plotting
        self.figure = Figure()

        # Create a FigureCanvasQTAgg object to display the figure
        self.canvas = FigureCanvasQTAgg(self.figure)

        # Add a NavigationToolbar2QT widget for interactive navigation
        self.toolbar = NavigationToolbar2QT(self.canvas, self)

        # Create a Plot button
        self.button = QtGui.QPushButton('Plot')
        self.button.clicked.connect(self.plot)

        # Set the layout
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.toolbar)
        layout.addWidget(self.canvas)
        layout.addWidget(self.button)
        self.setLayout(layout)</code>

<code class="python">    def plot(self):
        # Generate random data
        data = [random.random() for i in range(10)]

        # Create an axis on the figure
        ax = self.figure.add_subplot(111)

        # Clear the existing plot
        ax.clear()

        # Plot the data
        ax.plot(data, '*-')

        # Update the canvas
        self.canvas.draw()</code>

<code class="python">if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)

    main = Window()
    main.show()

    sys.exit(app.exec_())</code>