_fullLayout.*axis.autorange is never "reversed"

[nicolaskruchten]

Even when I set layout.xaxis.autorange = "reversed", it seems that it gets overwritten to true and so does _fullLayout.xaxis.autorange, making it impossible to build an RCE control for reversing the autorange.

[nicolaskruchten]

(this is the usual writeback pattern problem)

[etpinard]

Here's the offender:

plotly.js/src/plots/cartesian/autorange.js

Lines 84 to 89 in 3e3b22d

	// one-time setting to easily reverse the axis
	// when plotting from code
	if(ax.autorange === 'reversed') {
	axReverse = true;
	ax.autorange = true;
	}

I'll try to squeeze a fix for this in 1.49.0

[alexcjohnson]

I'm not sure this is just "a bug to be fixed" - the autorange operation never reverses the axis direction, so currently setting ax.autorange: true when ax.range = [bigger, smaller] will give you a reversed range.

In principle it would be nice to have ax.autorange = 'reversed' be a real setting, and the on-graph interactions look at the existing range to determine whether to set true or 'reversed'. But that would be a breaking change for anyone currently sending in autorange: true with a reversed dummy range - currently the "official" way to get a reversed autorange from the beginning.

[nicolaskruchten]

So what should I do in RCE? I should make a special widget that emulates the behaviour that should be there by saying "if autorange = true and max < min, then show as "reversed" but send true" ?

The problem is that right now if autorange=true and max > min, then sending "reversed" actually reverses it BUT if autorange=true and max < min then there's nothing I can .react() into that undoes it.

[nicolaskruchten]

Discussed out loud :)