[vtkusers] Problem : vtkImageViewer + AddObserver()

[JohnMark]

Hello ,
 
    I write a program to response to the mouse event in C++ . that is , 
 
there are three pictures in the rendering window , which are the objects of 
 
vtkImageViewer . In order to capture the mouse events , I use the 
 
vtkWin32RenderWindowInteractor instead of vtkRenderWindowInteractor .
 
and I write only one MyFunction that would be invoked by the three 
 
objects' AddObserver() function . then there is the problem :
 
if I press one picture with the mouse , how can I know the picture's 
 
Z Slice ? ( I display three pictures with different Z Slice )
 
    And the key is : you should get the picture's object , and then you could 
 
get the Z Slice through the function GetZSlice() .
 
    So I thought it would be OK if I wrote the Myfunction() for every 
 
pictures' AddObserver() several weeks ago . but the program 
 
would be too large if more pictures would be displayed 
 
in the rendering window . 
 
    can you give me some good suggestion to solve this problem :
 
use one MyFunction() to response the mouse events and 
 
get the picture or its Z Slices and so on that is clicked by the mouse ?
 
    Thank you very much and with regards !
 
    Mark
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