Didn't test, and don't intend to do.
x_axis_position seems the target.
this method can set x axis position top or bottom. but i want to set below the x axis as the positive direction of y axis.
It seems pretty hardcoded to be positive-up, but you could invert all your data and then invert the sign in x_axis_formatter.
This is the default formatter if you want to start with that: https://docs.rs/egui_plot/latest/src/egui_plot/axis.rs.html#154-170
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