Meaning and usage of the word "勢力図(的な)"


I'm reading a passage from a Japanese novel and happened upon an unfamiliar
piece of vocabulary "勢力図的な." When I tried looking it up in an online
dictionary, I got the definition of "Power relationships" for the term 勢力図,
however I am unsure what this refers to exactly, does it refer to how much
power person A has over person B in a relationship? Or maybe something else
entirely?

If someone could explain the meaning and in what context it might be used,
that would be great!




勢力図 would be a 'diagram' showing the distribution of power relationships or
influence, where they extend and how far, i.e. Their 'sphere/range of
influence'.

As an image, [the influence of K-Pop girl groups in
Japan.](http://livedoor.blogimg.jp/kgirl_lover-kpop123/imgs/d/0/d02c74a2.jpg)

As a sentence example.

[code]

    織田家内部の勢力図が大きく塗り変えられた。
    The power (political) influence map of the Oda family was drastically redrawn.
    
[/code]

I think that in this case, ～的な would be akin to 'a kind of' / 'a sort of'.

[code]

    勢力図的なもの作りました。
    I made kind of a diagram of the spheres of power/influence. 
    
[/code]

Edit (Feb.26): @mackygoo's answer is helpful in understanding that this
expression has taken on a broader context and can be used with many visual
representations of user preference, market dominance, product trends, voting
habits, etc.

