[Tutor] Matplotlib Slider Widget and changing colorbar threshold

[Kevin Khan]

I am currently trying to work on a program that will allow the user to
display their dataset in the form of a colormap and through the use of
sliders, it will also allow the user to adjust the threshold of the
colormap and thus update the colormap accordingly.  The best to describe
this would be through the use of a picture:


  [1]: http://i.stack.imgur.com/1T9Qp.png


This image shows how the colorbar should look before (the image on the
left) and after (the image on the right) the adjustment.  As the threshold
values of the colrobar are changed, the colormap would be updated
accordingly.

Now I am mainly using matplotlib and I found that matplotlib does support
some widgets, such as a slider.  However the area I need help in is
devising a piece of code which will update the colorbar and colormap (like
the way shown in the picture above) when the slider is adjusted.  I was
wondering if anyone has done this before and might have a piece of code
they would be willing to share and might have pointers as to how this can
be achieved.
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