[matplotlib-devel] matplotlib.image.AxesImage can't work.

I just want to show a matplotlib.image.AxesImage on a figure. But It can't
work properly. Can somebody help me? The code are following:  when I run it
, It just show a white figure. But I Set it cm.Greens .It doesn't work .
Why?


# -*- coding:gb2312 -*- 
import matplotlib
matplotlib.use("WXAgg")
matplotlib.interactive(True)
from matplotlib.backends.backend_wx import FigureCanvasWx
from matplotlib.figure import Figure
from matplotlib.axes import Subplot
from numpy import *
import wx

class ShowPlot():
    def __init__(self,Frame):
        delta = 0.025
        x = arange(-2.0, 2.0, delta)
        y = arange(-2.0, 2.0, delta)
        X, Y = meshgrid(x, y)
        Z1 = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
        Z2 = bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
        Z = 10.0 * (Z2 - Z1)       
        levels = arange(-1.2, 1.6, 0.2)        
        self.fig = Figure((6,6), 70)
        self.canvas = FigureCanvasWx(Frame, -1, self.fig)
        self.axe=self.fig.add_axes([0.1, 0.1, 0.8, 0.8])
       
i=matplotlib.image.AxesImage(self.axe,data=Z,interpolation='bilinear',
origin='lower',cmap=cm.Greens, extent=(-2,2,-2,2))
app = wx.PySimpleApp()
f=wx.Frame(None,size=(600,600))
f.Show(True)
ShowPlot(f)
app.MainLoop()
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