How to add negative values to JavaFx Area Chart? -

How to add negative values to JavaFx Area Chart? -

i'd draw difference (area) chart, this: how d3.js difference chart example work json data? chart centered around horizontal (y=0) axis.

javafx's area chart seems know how fill area below line!?

example "adding negative value" (fig 33-7) seems i'm looking (march series) but not work/render shown!

instead of:

enter image description here

it renders:

enter image description here

thanks,

igor

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