Image viewer plugins - multiple parameters from different functions

[Marcel Gutsche]

Hi folks, 

kind of a follow up question of my last one (see here 
<https://groups.google.com/forum/#%21topic/scikit-image/WXrwvxFd8xA>). 
<https://groups.google.com/forum/#%21topic/scikit-image/WXrwvxFd8xA> I 
still have a chain of image processing tasks, which I want to visualize 
with the image viewer. Certain parameters should be changed on the fly, 
where i can see the results in the image viwer immediately by the use of 
plugins. Something like this basically:


a, b  = previous_function(image, parameter1 = 0.002
                                    parameter = 0.02)
new_image = next_function(image, a, b, another_parameter = 3)


I managed to pass the values a and b, generated by a previous function 
using Juan's hint with functools.

next_function

which was fine as long as I don't want to change parameter1 and parameter2 
interactively. What do I do now, when I want to change them?  

Using functools here won't get me far, since now I want to be able to 
change parameter1 and parameter2 with a slider, as well as 
another_parameter. 

Maybe there is still a way to achive this, I saw something like a callback 
argument for the widgets, but I am not sure how to use them or whether they 
are related to my problem at all. I would also be fine with writing my own 
Plugin class, but could not get my head around the given examples. I feel 
that something like this is quite common, so I hope there are already ways 
to achieve this. 

Thanks a lot for the great work,
Marcel
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