[AstroPy] how to make a sky plot

[gonghang.naoc]

Hi everybody,
I made an all sky map  following the standard procedure here
http://matplotlib.org/examples/pylab_examples/geo_demo.html .

However, I can not adjust the data range. It is always -180 to 180 and I do
not know what does [-180,180] means.
And I can not rotate the map.  As you can see, the middle is always zero.
Besides, I can not define a range which could let me plot a part sky map.

Anybody knows a convenient way via EPD or Mayavi?

Thanks.
hang
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