[Feature] Be able to reverse legend order (stacked bar charts)

[jpike88]

What problem does this feature solve?

I am replacing dashboard paid for by companies in maintenance and oil/gas industries, who would have charts like below. See how the legend shows lowest to highest values (or increasing severity). The stacked bar shows the highest values at the bottom, as they tend to be more important and fluctuate less.

This is what I am aiming to achieve.

But I can't find a way to do this in echarts. See below for what I've managed to get done. You can see how bad it looks, having the legend ordered that way is counter intuitive.

What does the proposed API look like?

I think a simple

order: null | 'reversed' property on the legend property would be enough.

[helgasoft]

A workaround using visualMap instead of legend - Demo.
Disadvantage: bars not auto-rearranging after visibility toggle.
Advantage: bars auto-sorting by piece-types, ex: black bars always on bottom.