[R] How to custom colorscale in treemap

[nhbnhb]

Hi~I'm new to R. I'm following these two tutorials to make a tree map, but
the color scale isn't quite what I wanted.

For map of the market, the color scale starts from 0(red) to max(green),
what I wanted is 0(Green)-1(Red)-max(green). What's the easiest way to
achieve this kind of divergent color scale?

How shall I make my own palette and use it in the map.market or tree map
function?

Thank you very much~

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