observablehq / observablehq/plot
Helper to rename channels?
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Description
The use case is to apply all the transforms we want to x and y, then rename those channels as px and py before passing them to a pointer transform.
This allows to position the pointer target with the usual transforms without having to make them individually aware of the fact that we want them to operate on the px, py channels.
In https://talk.observablehq.com/t/pointer-transforms-with-px-py-on-stacked-bar-charts/8302 I gave a solution that explicitly renames x to px and y to py, but it could be a more generic helper such as channelRename({x: "px", y: "py"}, options)?
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
The issue names no files or tests. Start with the linked pointer-transform discussion and the proposed channelRename({x: "px", y: "py"}, options) API; compare it with the channel and pointer-transform entry points, then define expected behavior and tests for a generic channel rename helper.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- d3
- Domain
- data-visualization
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100