def draw_tree(canvas, figure, loc = (0,0)):
        """Draws the tree figure onto the tree canvas."""
        figure_canvas_agg = FigureCanvasAgg(figure)
        figure_canvas_agg.draw()
        figure_x, figure_y, figure_w, figure_h = figure.bbox.bounds
        figure_w, figure_h = int(figure_w), int(figure_h)
        photo = tk.PhotoImage(master=canvas, width=figure_w, height=figure_h)

        # Position: convert from top-left anchor to center anchor
        canvas.create_image(loc[0] + figure_w/2, loc[1] + figure_h/2, image=photo)

        # Unfortunately, there's no accessor for the pointer to the native renderer
        tkagg.blit(photo, figure_canvas_agg.get_renderer()._renderer, colormode=2)

        # Return a handle which contains a reference to the photo object
        # which must be kept live or else the picture disappears
        return photo

def draw_figure(canvas, figure, loc=(0, 0)):
    """ Draw a matplotlib figure onto a Tk canvas

    loc: location of top-left corner of figure on canvas in pixels.
    Inspired by matplotlib source: lib/matplotlib/backends/backend_tkagg.py
    """
    figure_canvas_agg = FigureCanvasAgg(figure)
    figure_canvas_agg.draw()
    figure_x, figure_y, figure_w, figure_h = figure.bbox.bounds
    figure_w, figure_h = int(figure_w), int(figure_h)
    photo = tk.PhotoImage(master=canvas, width=figure_w, height=figure_h)

    # Position: convert from top-left anchor to center anchor
    canvas.create_image(loc[0] + figure_w/2, loc[1] + figure_h/2, image=photo)

    # Unfortunately, there's no accessor for the pointer to the native renderer
    tkagg.blit(photo, figure_canvas_agg.get_renderer()._renderer, colormode=2)

    # Return a handle which contains a reference to the photo object
    # which must be kept live or else the picture disappears
    return photo

 def blit(self, bbox=None):
     tkagg.blit(self._tkphoto, self.renderer._renderer, bbox=bbox, colormode=2)
     self._master.update_idletasks()

 def draw(self):
     FigureCanvasAgg.draw(self)
     tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)
     self._master.update_idletasks()