[Matplotlib-users] the problem about axe

hello everyone,

I have use maplotlib to show an image. the image is a map. 
The problem is when I zoom in the map, The extent of self.ax changes to fix
my selected. However, I want the extent of self.ax stand unchanged. Only the
map's extent changed. Is there any suggestion?

        self.fig = Figure((8.8,6),facecolor='w')
        self.canvas= FigureCanvasWxAgg(frame, -1, self.fig)       
        self.ax= self.fig.add_axes([0.17,0.15,0.7,0.7],axisbg='#ffffff')
        self.im = self.ax.imshow(Zm, norm = colors.Normalize(vmin =
valueSet[0], vmax = valueSet[1], clip =
False),cmap=palette,interpolation='nearest')                    

Thank you.
Huang.
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