observablehq / observablehq/plot
Support contour and density isobands
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enhancement
- Dominant language
- HTML
- Stars
- 5.4k
- Forks
- 244
- PR merge metrics
- No merged PRs in 30d
Description
For #1399, and because it can be nice to do isobands. Depends on https://github.com/d3/d3-contour/issues/71
Notes:
- Isobands are great for fill (and necessary for variable fillOpacity), but not so much for stroke, since they would repeat every path (but the outermost one).
- It's very common to set a constant fillOpacity and constant fill on usual (layered) contours.
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 reading issue #1399 and the linked d3-contour issue 71 to understand the requested isoband support and its dependency. Review the existing contour and density behavior, then define completion around supporting filled isobands while accounting for the stated stroke and fillOpacity limitations.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- d3js
- Domain
- data-visualization
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100