observablehq / observablehq/plot

Generalize pointer selection

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#1,797 0 comments 1 reaction 1 assignee View on GitHub

@Fil is already working on this.

Since Aug 9, 2023.

enhancement
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Description

A “best candidate” function receives as input the channels and max radius, and returns a function that receives the pointer position and returns the best candidate, if any.

This allows a user to build:

  • a pointer that knows about rects, or links
    • we might want to build Plot.pointerRect as a standard method
  • a pointer that is optimized with a quadtree or a spatial tree
  • a pointer that returns several data points at the same time (maybe?)
  • a pointer that knows about geojson (#1743)
  • more custom behaviors?

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