[Tomviz] Opacity Controller Interactive Histogram Widget API required

[Pranav Joshi]

I am trying to develop software for my specific purpose and I want to use
the interactive Histogram widget from Tomviz in my project (which controls
the opacity). So, does tomviz provides any API for this ?? Or from source
code which files/classes should I import ?!
Does that widget is provided by VTK itself?
Thank you.
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