For creating pie charts in a Tk::Canvas, you'll probably want to use $canvas->createArc(...) with various options, including -style => 'pieslice'. See Tk::Canvas: ARC ITEMS.
I'm not really sure what you have in mind with respect to a "graph network".
Tk::Canvas: LINE ITEMS seems like the obvious choice; however, you're also talking about cross-linking, so perhaps that's not what you want.
You'll need to clarify what you mean in this regard.
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