To be clear about what people want here, it's the ability to add legend items corresponding to certain items in layout.shapes, right? Which would presumably allow those shapes to be toggled on or off by clicking the legend. (As opposed to inserting new custom shapes into existing legend entries, which seems to be how @etpinard interpreted this query originally)

This isn't on our roadmap, though if a company were interested in sponsoring it we'd be happy to talk https://plotly.com/consulting-and-oem/

But absolutely we'd be happy to accept and review a pull request. Before starting we should nail down the attributes to be created. I'm thinking these would be (within shapes/attributes):

showlegend (boolean)
legendgroup (string) - so you can toggle multiple shapes together
visible needs to add the option 'legendonly'

If that's all we add, shapes will all show up at the bottom of the legend, unless they're put into the same legendgroup as an earlier trace. Hopefully that's OK for the first version, later we can think about some more flexible ordering options.

Anything I'm missing?

Uh oh!

Uh oh!

Include shapes in legends #98

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