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Similar to tooltips and an interaction layer, cursors would be 🔥 and IMO, fit pretty naturally into the API by possibly being able to bind arbitrary marks (like ruleX and text) to your current cursor position. This would probably share a lot of logic with whatever is needed to implement brushing, I would imagine 🤔

Cursors are very helpful, especially if you could sync them across a faceted chart.

Can you elaborate on what you mean by cursors? Is it like keyboard focus navigation of the plotted data (as opposed to pointer-based)?

What I have in my mind is essentially x+y crosshairs that intersect at either your mouse/touch coords or (if we had an interaction model), the closest datum’s coords.

But now that you bring up, accessible keyboard-driven crosshairs would be awesome as well.

Okay, retitled the issue to use the term that speaks more clearly to me. Did “pointer-bound marks” refer to something else, or was it to distinguish between crosshairs at the pointer vs. crosshairs that snap to the closest data point?

No, it was mostly my own attempt to speak in "plot" vocabulary. I imagined the crosshairs as "marks" that were bound to the cursor position (or some interaction coordinate).

And who knows, that may be the case for the implementation, but I agree that crosshairs is a bit more descriptive for the concept as a whole.

Ah, I see, something more configurable… Interesting. Thanks for the additional context!

You bet! I especially love how everything in Plot is "just a mark/transform/etc". This is just one situation where that's really helped me think more clearly about how the API could technically be more flexible/powerful by using the same language/api for everything else.

sorry for begging. but i want this feature really and waited almost a year. :)

Sorry I should have mentioned here that I made a prototype “reticule” plugin (in July 2021) to address this: https://observablehq.com/@fil/reticule-plot-plugin