Implement `hoveron: 'fills'` for scattergl and scatterpolargl
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Description
During a discussion in the plotly.py forums in came up that the hoverlabel for the scatterpolar trace has a different behavior when the fill state is set to toself than when it's set to none.
CodePen: https://codepen.io/anon/pen/EpOGdX
fill: 'none' for scatterpolar
fill: 'toself' for scatterpolar
It also seems that the hoverinfo propery has no effect when fill is toself.
I did the same comparison with the scatterpolargl trace and it has the behavior that I expected:
fill: 'toself; for scatterpolargl
I don't know if this is a bug in scatterpolar or scatterpolargl, but I find the current scatterpolargl behavior (The behavior consistent with fill of none) to be more helpful.
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
Reproduce the linked CodePen and compare hover behavior for scatterpolar, scattergl, and scatterpolargl with fill set to none and toself. Start by tracing the hover handling for these trace types; done means hoverlabel and hoverinfo behavior is consistent with the expected fill behavior, with regression coverage added where the existing test structure permits.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100