observablehq / observablehq/plot
maybeIntervalK and other helpers drop per-channel scale overrides
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Description
While scale overrides are rarely used on position scales, this might be relevant in the future if we use them to support dual-scale charts #147. Currently the maybeIntervalK and maybeIntervalMidK (and probably maybeDenseInterval, the implicit bin transform?) drop the scale override option if the input channel is specified as a {value, interval} object.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing maybeIntervalK and maybeIntervalMidK, then check maybeDenseInterval and the implicit bin transform for handling inputs shaped as {value, interval}. Done means the per-channel scale override is preserved in these cases, with behavior suitable for the possible dual-scale chart use described in the issue.
Written by the indexing model from the issue text.
Assessment
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100