Observable-Community

image.png

in these minimal reproductions, `areaY` just doesn't seem to want to respect

it gets somewhat weirder when the cardinality of `fill` gets high*

`reverse: true` I think reverses just the color legend domain, but not the area stacking order

anyway, this _feels_ like a bug: would someone be able to confirm that I'm not holding the interface wrong somehow?

The problem is that the *reverse* option is also used for the built-in sort transform (to reverse the mark index), and hence it takes effect _before_ the bin transform rather than being interpreted as an option to the stack transform. If you want to pass it to the stack transform, you need to call Plot.stackY explicitly and pass {reverse: true} as the first argument:
```Plot.areaY(data, Plot.stackY({reverse: true}, Plot.binX({y: "count"}, …)))```

As a notebook: <https://observablehq.com/@observablehq/plot-stack-with-reverse-order>

ah, brilliant, thanks <@U048G7LAQ5A>! I had a feeling that perhaps the `reverse` was in the wrong spot, completely forgot that there was a `reverse` in the sort transform too