Mpl3dCanvas

from PyQt4.QtCore import QSize
from PyQt4.QtGui import QSizePolicy, QWidget, QHBoxLayout

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import mpl_toolkits.mplot3d.axes3d as plt3

class Mpl3dCanvas(FigureCanvas):
    def __init__(self, parent=None, width = 10, height = 12, dpi = 60):
        self.fig = Figure(figsize = (width, height), dpi=dpi)

        FigureCanvas.__init__(self, self.fig)
        FigureCanvas.setSizePolicy(self,
                QSizePolicy.Expanding,
                QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

        self.ax = plt3.Axes3D(self.fig)
        self.ax.hold(True)

    def sizeHint(self):
        w, h = self.get_width_height()
        return QSize(w, h)

    def minimumSizeHint(self):
        return QSize(100, 100)

class Mpl3dWidget(QWidget):
    def __init__(self, parent = None):
        QWidget.__init__(self, parent)
        self.canvas = Mpl3dCanvas()
        #self.toolbar = MyNavigationToolbar(self.canvas, self.canvas, direction = 'v')
        self.hbox = QHBoxLayout()
        #self.hbox.addWidget(self.toolbar)
        self.hbox.addWidget(self.canvas)
        self.setLayout(self.hbox)
        self.axes = self.canvas.ax

    def paintEvent(self, event):
        self.canvas.draw()